What does a Honeywell 7800 Series burner control system require?

A complete Honeywell 7800 Series burner management system requires four components that must be selected together: (1) Relay module — the RM7800L, RM7840, RM7890, or other 7800 variant matched to your application's purge timing, pilot flame establishing period, and fuel type. The RM7800L1012 is the most common 120 VAC model. (2) Q7800 wiring subbase — the relay module plugs into the Q7800A1005 (panel mount) or Q7800B1003 (burner/wall mount) subbase. (3) Flame amplifier — the R7847 series for flame rod detection, R7849 for UV scanners (C7027/C7035), or R7851 for C7927 UV scanners. The amplifier type must exactly match your flame detection method and scanner. (4) Flame scanner — C7027 Mini-Peeper (UV), C7927 (UV solid state), or C7012 (UV, Purple Peeper). Optional add-ons include the S7800A1142 keyboard display module (provides full diagnostics and valve proving system programming), S7810 ModBus or ControlBus modules for remote monitoring, and S7820 remote reset module. Call Memphis Control Center at (901) 458-2000 with your existing system configuration — we will identify the correct replacement components.

What is the difference between Honeywell 7800 Series flame amplifiers R7847, R7849, and R7851?

Honeywell 7800 Series flame amplifiers are plug-in modules that interface between the flame scanner and the relay module. Each amplifier type is designed for a specific type of flame detection: R7847 series (flame rod amplifiers) — for burners using a flame rod (ionization rod) to detect flame. The R7847A1025 (0.8 second FFRT) and R7847A1033 (3.0 second FFRT) are non-AmpliCheck versions; R7847B versions include AmpliCheck self-check circuitry. R7849 series (UV amplifiers) — for use with Honeywell UV scanners such as the C7027 Mini-Peeper and C7035. R7849A versions are without AmpliCheck; R7849B versions include AmpliCheck. R7851 series — for use with Honeywell C7927 solid state UV scanner. R7851B includes AmpliCheck; R7851C is a dynamic self-check version for C7961E/F scanners. The amplifier must be matched to your scanner type — installing the wrong amplifier type will result in lockout or unsafe operation. FFRT is Flame Failure Response Time. AmpliCheck provides additional self-checking. Call (901) 458-2000 to confirm the correct amplifier for your system.

What does the TB6575A1000 replace and is it a direct replacement?

The Honeywell TB6575A1000 SuitePRO digital fan coil thermostat is a direct replacement for several legacy Honeywell fan coil thermostat models. Per Honeywell's product documentation and as noted on the Memphis Control Center product listing, the TB6575A1000 replaces: TB6575A1016, T6051A1016, T6575D1009, T6069A4010, T6575B1003, and T6575C1001. The TB6575A1000 provides equivalent functionality for 2-pipe and 4-pipe fan coil unit applications with 3-speed fan control and a 50–90°F setpoint temperature range. If you are replacing a different legacy model not in this list, call (901) 458-2000 with the existing model number before ordering — we will confirm compatibility or identify the correct current replacement.

The C7012 Purple Peeper is obsolete — what is the replacement and what else must change?

The Honeywell C7012 Purple Peeper UV detector is discontinued. The supported replacement is the C7061 dynamic self-check UV flame detector. This requires two simultaneous changes: (1) Replace the C7012 scanner with the C7061. (2) Replace the R7847 flame amplifier with the R7861 dynamic self-check amplifier. The R7861 fits the same Q7800 amplifier socket so no subbase rewiring is required. Call Memphis Control Center at (901) 458-2000 to confirm your system configuration and order both components.

What is the difference between C6097A and C6097B Honeywell pressure switches?

C6097A breaks (opens) on pressure fall — used for low-gas-pressure cutoff, gas proving, and low-air-pressure proving. C6097B breaks on pressure rise — used for high-gas-pressure shutoff and overpressure protection. Within each family, auto-reset versions restore automatically when pressure normalizes; manual-reset versions require physical reset after a trip. Pressure ranges span 0.4 inch W.C. to 200 inch W.C. Memphis Control Center stocks 28 C6097 SKUs. Call (901) 458-2000 for range selection help.

The C7012 Purple Peeper on my burner is bad — what is the current replacement?

The Honeywell C7012 Purple Peeper is discontinued and no longer manufactured. The current replacement is the C7061 dynamic self-check UV flame detector. This is not a drop-in swap — it requires two changes: replace the C7012 scanner with the C7061, and replace the R7847 flame amplifier with the R7861 series (R7847 amplifiers are not compatible with C7061 detectors). The R7861A1026 (0.8 sec FFRT) or R7861A1034 (3.0 sec FFRT) are the correct amplifiers for C7061. Call Memphis Control Center at (901) 458-2000 with your system configuration for help confirming the exact replacement parts.

Honeywell Gold PMT Channel Partner · Memphis, TN · Family-Owned Since 1967

Honeywell Thermal Solutions —
Burner Controls, Gas Valves, Flame Scanners, Actuators & HVAC Controls

Q: What is the difference between Modutrol IV motors and direct-coupled damper actuators?

Honeywell Modutrol IV motors (M4185, M6184, M7185, M9184 series) are foot-mounted rotary actuators that connect to damper or valve shafts via mechanical linkage assemblies — crank arms, push-pull rods, and brackets. They are the traditional Honeywell actuator for large commercial HVAC air handling units, VAV systems, and industrial process valve applications. Direct-coupled damper actuators (MS and MN series — MS4120F, MS8120F, MN7234, etc.) clamp directly to the damper shaft without linkage, making them faster to install and more compact. MS Series are two-position (open/close); MN Series are modulating (accept 0–10V or 2–10V DC). Choose Modutrol when replacing an existing Modutrol system or when torque requirements exceed what direct-coupled actuators provide. Choose direct-coupled for new installations or when compact installation is required. Call (901) 458-2000 with your application details for a recommendation.

Q: Can Memphis Control Center source Honeywell parts not listed on the website?

Yes. Memphis Control Center is an authorized Honeywell Gold PMT Channel Partner — one of the highest tier distributor designations Honeywell awards. This means we have direct access to the full Honeywell Thermal Solutions product catalog, including products not currently listed on our website. If you need a Honeywell part number — whether it's a 7800 Series relay module, a Modutrol motor, a gas valve, an amplifier, a sensor, a thermostat, a process controller, or any other Honeywell Thermal Solutions product — call (901) 458-2000 or use the contact form with the full part number. We will confirm availability and lead time and can fulfill the order. Memphis Control Center has been an authorized Honeywell distributor since 1967.

Q: How do I select the right Honeywell C6097 pressure switch?

C6097A breaks on pressure fall — opens the circuit when pressure drops below the setpoint. Used for low-gas-pressure cutoff and gas proving. C6097B breaks on pressure rise — opens when pressure exceeds the setpoint. Used for high-gas-pressure shutoff. After choosing A or B, select the range model whose setpoint falls within the marked adjustment range — for example C6097A3004 (0.4 to 5 inches W.C.) or C6097A3053 (1 to 20 inches W.C.). Auto-reset versions re-close when pressure recovers; manual-reset versions require operator acknowledgment. Memphis Control Center stocks 28 C6097 SKUs. Call (901) 458-2000 for help selecting the correct switch for your application.

Authorized Honeywell Gold PMT Channel Partner stocking Honeywell Thermal Solutions across every major product family: 7800 Series burner controls (RM7800L1012, RM7800L1087, RM7840L1018, RM7840L1075, RM7895, RM7897, RM7838); flame amplifiers (R7847, R7849, R7861, R7886); UV flame scanners (C7027A1049 Mini-Peeper); C6097 pressure switches; fan coil thermostats (TB6575A1000, TB8575A1000); Modutrol IV motors (M9184, M7284, M9484, M4185); damper actuators (MS4120F, MN7234); T775 temperature controllers; UDC process controllers. Family-owned, serving Memphis since 1967.

Browse All Honeywell Products Call (901) 458-2000

Honeywell Gold PMT Channel Partner 7800 Series · Modutrol · Flame Scanners HVAC · Combustion · Process Controls UL · FM · CE Approved Products Family-Owned Since 1967

Gold PMT Channel PartnerOne of the highest Honeywell distributor tier designations — direct access to the full Honeywell Thermal Solutions catalog and authorized technical support

15,000+ Honeywell SKUsThe broadest Honeywell catalog in the Mid-South — burner controls, flame scanners, gas valves, actuators, thermostats, process controllers, sensors, and accessories

Technical ExpertiseCross-reference help, amplifier selection, subbase compatibility, replacement identification — real combustion controls expertise on every call since 1967

Same-Day ShippingStocked Honeywell products ship same day from Memphis, TN — free. Call (901) 458-2000 to confirm availability on any Honeywell part number

⭐

Honeywell Gold PMT Channel Partner. Memphis Control Center holds Honeywell's Gold PMT Channel Partner designation — one of the highest tier recognitions Honeywell awards to authorized distributors. Direct access to the full Honeywell Thermal Solutions catalog and authorized technical resources. If you don't see your part number, call (901) 458-2000.

Shop Honeywell by Category

Honeywell products span multiple product categories on our site. Use these links to browse by type, or contact us with a part number and we'll locate it directly.

Flame Safety & Burner Controls Flame Scanners Gas Valves & Controls Actuators Thermostats Temperature Controls Pressure Switches Boiler Controls Ignition Controls Regulators Transformers OEM Parts

Honeywell Product Families — Most Searched

Memphis Control Center stocks and special-orders across all major Honeywell Thermal Solutions product families. Click any card to shop, or call (901) 458-2000 with your part number.

7800 Series Integrated Burner Controls — RM7800, RM7840, RM7895, RM7897, RM7838

The Honeywell 7800 Series is the most widely installed family of flame safeguard controls in North American commercial and industrial combustion equipment — boilers, process heaters, furnaces, kilns, and industrial ovens. Every system requires four components: (1) relay module, (2) Q7800 wiring subbase, (3) flame amplifier (must match your flame detection method), and (4) flame scanner. Optional: S7800 keyboard display module for full diagnostics and valve proving.

Model	Description	Shop
RM7800L1012	Programmer, 120 VAC, LHL-LF & HF proven — incl. S7800A1001 display	Shop
RM7800L1087	Programmer w/ VPS, 120 VAC — incl. S7800A1142 display	Shop
RM7840L1018	Modulating programmer, 120 VAC, LHL-LF & HF proven	Shop
RM7840L1075	Modulating programmer w/ VPS, 120 VAC	Shop
RM7895A1014	On/off primary control w/ prepurge, 120 VAC	Shop
RM7897A1002	On/off w/ pre- & programmable post-purge, VPS	Shop
RM7838B1013	Manual start industrial programmer, 120 VAC	Shop
Q7800A1005	22-terminal wiring subbase — panel mount	Shop
Q7800B1003	22-terminal wiring subbase — burner/wall mount	Shop
S7800A1001	Keyboard display module — standard	Shop
S7800A1142	Keyboard display module — with valve proving (VPS)	Shop
R7847A/B series	Flame amplifier — flame rod & C7012 UV detectors	Shop
R7849A/B series	Flame amplifier — C7027/C7035 UV scanners	Shop
R7861A series	Flame amplifier — C7061 dynamic self-check UV	Shop

RM7800 · RM7840 · RM7895 · RM7897 · RM7838 120 VAC · 50/60 Hz Q7800 Subbase Required VPS Valve Proving Option UL · FM · CSA · CE Modbus RTU · ControlBus™

Flame Scanners UV & IR Flame Scanners — C7027, C7927, C7061, C7076, C7915

Honeywell flame scanners detect burner flame and send a signal to the burner control's flame amplifier. Scanner selection must match the amplifier installed in your 7800 Series control. The C7027A1049 Mini-Peeper is the most widely used UV scanner — 1/2" NPT, 0°F to 215°F, UL/FM/CSA. The C7927 is a solid state UV (ultraviolet) scanner used with R7851 amplifiers. The C7061 is a dynamic self-check UV scanner used with R7861 amplifiers. The C7915 is Honeywell's infrared (IR) flame detector, used with R7852 amplifiers.

Model	Type	Mount / Lead	Amplifier	Shop
C7027A1049	UV Mini-Peeper	1/2" NPT	R7849A/B	Shop
C7027A1023	UV Mini-Peeper	1/2" NPT · 18" leads	R7849A/B	Shop
C7027A1072	UV Mini-Peeper	1/2" NPT · 96" leads	R7849A/B	Shop
C7035A1031	UV Mini-Peeper	1" NPT · NEMA 3/4	R7849A/B	Shop
C7061A1053	Dynamic self-check UV · NEMA 4	3/4" NPT	R7861A	Shop
C7061A1046	Dynamic self-check UV · 115/230V	Brad Harrison connector	R7861A	Shop
C7061F2001	Dynamic self-check UV · explosion-proof	1" NPT · 96" leads	R7861A	Shop
C7915A1028	Infrared (IR) · lead sulfide	3/4" NPT · 48" leads	R7852A/B	Shop
C7915A1036	Infrared (IR) · lead sulfide	3/4" NPT · 96" leads	R7852A/B	Shop

⚠ C7012 Purple Peeper — Discontinued / Obsolete. The Honeywell C7012 Purple Peeper UV detector is discontinued and no longer manufactured. The current replacement is the C7061 dynamic self-check UV detector. This is not a drop-in swap — switching from C7012 to C7061 also requires changing the flame amplifier from the R7847 series to the R7861 series, as R7847 amplifiers are not compatible with C7061 detectors. Contact (901) 458-2000 if you need help specifying the replacement pair.

UV: C7027 · C7035 · C7927 · C7061 · C7076 IR: C7915 Must Match Amplifier Type UL · FM · CSA C6097 Pressure Switches

Pressure Switches C6097 Gas & Air Pressure Switches — C6097A, C6097B

The Honeywell C6097 series is the industry standard diaphragm-actuated pressure switch for natural gas, LP gas, and combustion air safety circuits on commercial and industrial burners and boilers. Memphis Control Center stocks 28 C6097 SKUs. C6097A — breaks on pressure fall (low-gas-pressure cutoff, gas proving — burner cannot fire if upstream gas pressure is insufficient). C6097B — breaks on pressure rise (high-gas-pressure shutoff — cuts fuel if supply pressure exceeds safe limits). Both types available in auto-reset and manual-reset, from 0.4" to 200" W.C. Also European mbar variants (C6097A4xxx series).

Model	Type	Reset	Range	Shop
C6097A3004	Breaks on fall	Auto	0.4"–5" W.C.	Shop
C6097A3053	Breaks on fall	Auto	1"–20" W.C.	Shop
C6097A3012	Breaks on fall	Manual	1"–20" W.C.	Shop
C6097A3079	Breaks on fall	Auto	12"–60" W.C.	Shop
C6097A3111	Breaks on fall	Manual	40"–200" W.C.	Shop
C6097B3002	Breaks on rise	Manual	12"–60" W.C.	Shop
C6097B3028	Breaks on rise	Manual	1"–20" W.C.	Shop
C6097B3085	Breaks on rise	Auto	12"–60" W.C.	Shop

Selection: (1) A = fall (low cutoff) vs. B = rise (high shutoff) (2) Pressure range must include your operating setpoint (3) Auto or manual reset (4) Mount: 1/4" NPT standard. Browse all 28 C6097 SKUs →

C6097A — Breaks on Fall C6097B — Breaks on Rise Auto & Manual Reset 0.4"–200" W.C. 1/4" NPT · mbar European

Thermostats Fan Coil Thermostats — TB6575, TB8575 SuitePRO Series

The Honeywell TB6575A1000 and TB8575A1000 SuitePRO are digital fan coil thermostats for 2-pipe and 4-pipe FCU applications in hotels, apartments, office buildings, and healthcare facilities. The TB6575A1000 directly replaces: TB6575A1016, T6051A1016, T6575D1009, T6069A4010, T6575B1003, and T6575C1001. Both models feature 3-speed fan control and a 50–90°F setpoint range. The TC500A-N is a commercial connected touchscreen thermostat for advanced building control.

Model	Description	Shop
TB6575A1000	SuitePRO fan coil thermostat, digital, 2/4-pipe, 3-speed fan, 50–90°F	Shop
TB8575A1000	SuitePRO fan coil thermostat, LCD display, 2/4-pipe, 24 VAC	Shop
TC500A-N	Commercial touchscreen thermostat, 24V, programmable	Shop

TB6575A1000 replaces: TB6575A1016, T6051A1016, T6575D1009, T6069A4010, T6575B1003, T6575C1001

2-Pipe & 4-Pipe FCU 3-Speed Fan Control Hotels · Apartments · Offices 50–90°F Range

Modutrol IV Modutrol IV Motors — M9184, M7284, M9484, M4185, M6184, M7285

Honeywell Modutrol IV motors are foot-mounted rotary actuators for damper and valve positioning. M9184 (24V, 135Ω Series 90) — proportional. M7284 (120V, 4–20 mA) — for DDC/milliamp output. M9484 (24V, firing rate) — reversing proportional for burner firing rate valves. On/Off — M4185B, M6184F, M7285C.

Model	V	Control	Torque	Type	Shop
M9184C1031	24V	135Ω Ser.90	150 lb-in	NSR · 2 aux sw.	Shop
M9184A1019	24V	135Ω Ser.90	150 lb-in	NSR · 1 aux sw.	Shop
M7284A1004	120V	4–20 mA	150 lb-in	NSR · NEMA 3 · dual shaft	Shop
M7284C1000	120V	4–20 mA	150 lb-in	NSR · modulating	Shop
M7284Q1009	120V	4–20 mA	150 lb-in	NSR	Shop
M9484F1007	24V	Reversing prop.	150 lb-in	Firing rate · NSR	Shop
M9484F1031	24V	Reversing prop.	150 lb-in	Firing rate · adj. stroke	Shop
M4185B1009	120V	SPST on/off	60 lb-in	Spring return · 1 aux sw.	Shop
M6184F1014	120V	On/off	60 lb-in	Non-spring return	Shop
M7285C1009	120V	SPST on/off	60 lb-in	Spring return · 2 aux sw.	Shop

NSR = non-spring return. Selection factors: voltage, control signal (135Ω / 4–20 mA / on/off), torque, spring return, aux switch count. Call (901) 458-2000 for help.

M9184 · M7284 · M9484 · M4185 · M6184 · M7285 24V · 120V Series 90 · 4–20 mA · On/Off Spring & Non-Spring Return HVAC · Combustion · Firing Rate

Damper Actuators Direct-Coupled Damper Actuators — MS4120F, MN7234 Series

Honeywell direct-coupled damper actuators (MS and MN Series) clamp directly to the damper shaft without mechanical linkage. MS Series — two-position (fully open/closed on a signal). MN Series — modulating, accept 0–10V or 2–10V DC for proportional positioning.

Model	Type	Torque	Voltage	Shop
MS4120F1006	Two-position, spring return	175 lb-in	120V	Shop
MN7234A2008	Modulating, non-spring return	300 lb-in	24V, 0/2–10 Vdc	Shop

Two-Position · Modulating Spring & Non-Spring Return 120V · 24V 0–10V · 2–10V Control

Temp Controllers T775 Series 2000 — Electronic Standalone Temperature Controllers

The Honeywell T775 Series 2000 is a standalone multi-loop electronic controller for remote temperature sensing with relay and/or analog proportional outputs. Used in commercial HVAC, boiler sequencing, agricultural, and industrial applications. T775B — relay-only, 2 SPDT. T775M — modulating: relay + analog outputs (4–20 mA, 0–10V, 2–10V, Series 90). T775P — boiler-specific: 3 sensor inputs, 4 SPDT relays, pump output. T775U — universal: temperature, humidity, or pressure input. T775R — outdoor-air reset: 4 SPDT + 2 floating outputs.

Model	Type	Relays	Analog Out	Enclosure	Shop
T775B2032	Standard	2 SPDT	—	NEMA 1	Shop
T775M2048	Modulating	2 SPDT	2	NEMA 1	Shop
T775M2030	Modulating	4 SPDT	2	NEMA 1	Shop
T775M2014	Modulating	4 SPDT	2	NEMA 4X	Shop
T775P2003	Boiler special	4 SPDT + pump	—	NEMA 1	Shop
T775U2006	Universal	2	2	NEMA 1	Shop
T775R2001	Reset / OA reset	4 SPDT + 2 float.	—	NEMA 1	Shop

T775B · T775M · T775P · T775U · T775R 24V · 120V · 240V NEMA 1 · NEMA 4X 4–20 mA · 0–10V · Series 90 Boiler Sequencing · OA Reset

Process Controllers UDC Process Controllers — UDC1200, UDC2800

Honeywell UDC Series (Universal Digital Controllers) are 1/16 DIN (UDC1200) and 1/4 DIN (UDC2800) panel-mount PID controllers for industrial temperature, pressure, and process variable control. Used in ovens, heat treat furnaces, kilns, boilers, and industrial process equipment. The UDC2800 features Accutune III fuzzy logic auto-tuning, TFT color display, Bluetooth configuration, and NEMA 4X/IP66 housing. FM-approved limit controller versions available.

Model	Description	Shop
DC1201-1-1-0-0-2-0-0-0	UDC1200, 1/16 DIN, RTD/mV input, dual relay, 90–264 VAC	Shop
DC120L-1-0-0-0-1-0-0-0	UDC1200 FM limit controller, single relay	Shop
DC2800-CE-0S0-200-000-00-0	UDC2800, 1/4 DIN, single loop, Bluetooth, TFT, NEMA 4X	Shop
DC2800-E0-0L0-200-200-00-0	UDC2800 FM limit controller, 1/4 DIN, NEMA 4X	Shop

UDC1200 (1/16 DIN) · UDC2800 (1/4 DIN) PID Control · FM Limit Options Bluetooth Config (UDC2800) NEMA 4X/IP66

Quick Access — Popular Honeywell Products

Browse all →

RM7800L10127800 burner control · 120V RM7800L10877800 burner control · VPS RM7840L10187800 modulating · 120V R7847A1033Flame amplifier · flame rod · 3.0s C7027A1049Mini-Peeper UV scanner · 1/2" NPT C6097A3004Pressure sw. · 0.4"–5" W.C. · auto C6097A3012Pressure sw. · 1"–20" W.C. · manual C6097B3028Pressure sw. · 1"–20" W.C. · rise TB6575A1000SuitePRO fan coil thermostat TB8575A1000SuitePRO fan coil thermostat · LCD M9184C1031Modutrol IV · 24V · 150 lb-in NSR M7284A1004Modutrol IV · 120V · 4–20 mA M9484F1007Modutrol IV · 24V · firing rate M4185B1009Modutrol IV · 120V · 60 lb-in SR MS4120F1006Damper actuator · 120V · 175 lb-in SR 0901786AGlobe valve repack kit · 1/2"–1-1/4" All C6097 →Browse all 28 pressure switch SKUs All Honeywell →Browse the full 15,000+ SKU catalog

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Most-Searched Honeywell Part Numbers

These are the Honeywell part numbers most frequently searched by engineers, contractors, and technicians. Don't see your part number? Contact us or call (901) 458-2000.

Part Number	Description	Category	Shop
RM7800L1012	7800 Series programmer, 120 VAC, incl. S7800A1001	Burner Controls	Shop
RM7800L1087	7800 Series programmer w/ VPS, incl. S7800A1142	Burner Controls	Shop
RM7840L1018	7800 Series modulating programmer, 120 VAC	Burner Controls	Shop
RM7840L1075	7800 Series modulating programmer w/ VPS	Burner Controls	Shop
R7847A1033	Flame amplifier — flame rod, 3.0 sec FFRT	Burner Controls	Shop
C7027A1049	Mini-Peeper UV flame scanner, 1/2" NPT, 0°F–215°F	Flame Scanners	Shop
C7061A1053	Dynamic self-check UV scanner, NEMA 4, 3/4" NPT	Flame Scanners	Shop
C7915A1028	Infrared (IR) flame detector, 48" leads, 3/4" NPT	Flame Scanners	Shop
C6097A3004	Pressure switch — 0.4"–5" W.C., auto reset, breaks on fall	Pressure Switches	Shop
C6097A3012	Pressure switch — 1"–20" W.C., manual reset, breaks on fall	Pressure Switches	Shop
TB6575A1000	SuitePRO fan coil thermostat, 2/4-pipe, 50–90°F	Thermostats	Shop
M9184C1031	Modutrol IV, 24V, 135Ω Series 90, 150 lb-in, NSR	Actuators	Shop
M9484F1007	Modutrol IV firing rate motor, 24V, 150 lb-in	Actuators	Shop
MS4120F1006	Damper actuator, two-position, 120V, 175 lb-in, spring return	Actuators	Shop
0901786A	Repack kit for V5011/V5013 globe valves, 1/2"–1-1/4"	Globe Valves	Shop

Don't see your part? Contact us or call (901) 458-2000 — as a Gold PMT Channel Partner we can source the full Honeywell catalog.

Can't find your Honeywell part number?

As a Gold PMT Channel Partner, we can source from the full Honeywell catalog. Give us your part number and we'll confirm availability and lead time.

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Honeywell Thermal Solutions — Frequently Asked Questions

Common questions about Honeywell 7800 Series burner controls, flame amplifiers, fan coil thermostats, Modutrol motors, and actuator selection. Contact us or call (901) 458-2000 — Memphis Control Center has been an authorized Honeywell distributor since 1967.

What does a complete Honeywell 7800 Series burner control system require?

A complete 7800 Series system requires four components: (1) Relay module — RM7800L, RM7840, RM7890, or other 7800 variant (RM7800L1012 is the most common 120 VAC model). (2) Q7800 wiring subbase — Q7800A1005 (panel mount) or Q7800B1003 (burner/wall mount). (3) Flame amplifier — R7847 for flame rod, R7849 for UV scanners (C7027/C7035), R7851 for C7927 UV scanners. Amplifier type must exactly match your flame detection method. (4) Flame scanner — C7027 Mini-Peeper (UV), C7927 (UV solid state), or C7012 (UV, Purple Peeper). Optional: S7800A1142 keyboard display for full diagnostics and valve proving. Call (901) 458-2000 with your existing system configuration — we will identify the correct replacement components.

What is the difference between R7847, R7849, and R7851 flame amplifiers?

These are all 7800 Series plug-in flame amplifiers, but each is designed for a specific detection method: R7847 — flame rod (ionization rod) detection. R7847A is standard; R7847B adds AmpliCheck® self-check circuitry. R7849 — UV scanner (C7027 Mini-Peeper, C7035). R7849A is standard; R7849B adds AmpliCheck®. R7851 — C7927 UV solid state scanner. R7851B adds AmpliCheck®; R7851C adds dynamic self-check. The suffix letters within each family indicate the Flame Failure Response Time (FFRT) — A or B versions ending in "25" or "23" are 0.8-second FFRT; "33" or "31" are 3.0-second FFRT. The amplifier must match your scanner type — installing the wrong amplifier results in lockout or unsafe operation. Call (901) 458-2000 to confirm the correct amplifier.

What does the TB6575A1000 replace?

The Honeywell TB6575A1000 SuitePRO fan coil thermostat is a direct replacement for: TB6575A1016, T6051A1016, T6575D1009, T6069A4010, T6575B1003, and T6575C1001 — as noted in Honeywell product documentation and confirmed on the Memphis Control Center product listing. It provides equivalent 2-pipe/4-pipe fan coil unit functionality with 3-speed fan control and 50–90°F setpoint range. If you're replacing a model not in this list, call (901) 458-2000 with the existing model number before ordering.

What is the difference between Modutrol IV motors and direct-coupled damper actuators?

Modutrol IV motors (M4185, M6184, M7185, M9184 series) are foot-mounted rotary actuators that connect to damper or valve shafts via mechanical linkage — crank arms, push-pull rods, and brackets. They are the traditional Honeywell actuator for large commercial air handling units, VAV systems, and industrial valve applications. Direct-coupled damper actuators (MS Series and MN Series) clamp directly to the damper shaft without linkage, making them faster to install and more compact. MS Series are two-position (fully open/closed); MN Series are modulating (0–10V or 2–10V DC signal). Choose Modutrol when replacing an existing Modutrol system or when high torque is needed. Choose direct-coupled for new installations or where compact installation is preferred. Call (901) 458-2000 for a recommendation.

Can Memphis Control Center source Honeywell parts not listed on the website?

Yes. As an authorized Honeywell Gold PMT Channel Partner, we have direct access to the full Honeywell Thermal Solutions product catalog — including products not currently listed on our website. If you need any Honeywell part number — 7800 Series relay modules, Modutrol motors, gas valves, amplifiers, sensors, thermostats, process controllers, or any other Honeywell Thermal Solutions product — call (901) 458-2000 or use the contact form with the full part number. We will confirm availability and lead time. Memphis Control Center has been an authorized Honeywell distributor since 1967.

What is the difference between RM7800, RM7840, RM7895, RM7897, and RM7838?

All are 7800 Series relay modules using the same Q7800 subbase, but each serves a different burner type or application: RM7800 — programmer for on/off and full modulation single-burner applications (gas, oil, combination fuel). The RM7800L1012 is the most common 120 VAC model; RM7800L1087 adds Valve Proving System (VPS). RM7840 — modulating burner programmer for full-modulation fired equipment where firing rate varies continuously rather than on/off. RM7840L1018 is the standard modulating model; RM7840L1075 adds VPS. RM7895 — on/off primary control with prepurge, FM/IRI approved for applications where FM or industrial risk underwriters require higher approval levels. RM7897 — on/off with pre- and programmable post-purge plus VPS; required where valve proving is mandated. RM7838 — industrial manual-start programmer for semi-automatically fired industrial burners where an operator initiates each start sequence. If you're unsure which chassis your application requires, call (901) 458-2000 — our team has been specifying Honeywell flame safeguard controls since 1967.

The C7012 Purple Peeper is obsolete — what replaces it, and what else changes?

The Honeywell C7012 Purple Peeper UV detector is discontinued and no longer manufactured. The supported replacement is the C7061 dynamic self-check UV flame detector. This is not a plug-in swap — two things must change together: (1) Scanner: C7012 → C7061. (2) Flame amplifier: the R7847 R7847 amplifier used with the C7012 UV detector must be replaced with an R7861 dynamic self-check amplifier compatible with the C7061. If you replace only the scanner without changing the amplifier, the system will not operate correctly. The R7861 fits the same Q7800 amplifier socket as the R7847, so no subbase or relay module wiring changes are required — only the amplifier module and the scanner are swapped. Call (901) 458-2000 — we stock both the C7061 and R7861 and can confirm your system configuration before you order.

What is the difference between C6097A and C6097B pressure switches?

The suffix letter tells you the action: C6097A breaks (opens its circuit) on a pressure fall — used wherever you need the burner to shut down when pressure drops below a setpoint. Typical applications: low-gas-pressure cutoff (gas proving switch to confirm supply pressure before ignition), low-air-pressure proving on forced-draft systems, and low-limit safety on LP gas systems. C6097B breaks on a pressure rise — used wherever you need the burner to shut down when pressure exceeds a setpoint. Typical applications: high-gas-pressure safety shutoff, high-air-pressure cutoff, and overpressure protection. Within each family, further digits indicate the pressure range and reset type: auto-reset (automatically restores when pressure returns to normal) vs manual-reset (must be physically reset at the switch after a trip — required by some codes for safety-critical circuits). Memphis Control Center stocks both C6097A and C6097B variants across pressure ranges from 0.4" W.C. to 200" W.C. Browse all C6097 switches or call (901) 458-2000 for range selection help.

The C7012 Purple Peeper on my burner is bad — what's the replacement?

The Honeywell C7012 Purple Peeper is discontinued and no longer manufactured. The current replacement is the C7061 dynamic self-check UV flame detector. This is not a drop-in swap — it requires two changes: (1) Replace the C7012 scanner with the C7061. (2) Replace the R7847 flame amplifier with an R7861 — R7847 amplifiers are not compatible with C7061 detectors. The R7861A1026 (0.8 sec FFRT) or R7861A1034 (3.0 sec FFRT) are the correct amplifiers for C7061 dynamic self-check UV scanners. Call (901) 458-2000 with your current system configuration — we'll confirm the exact C7061 and R7861 part numbers and check availability.

How do I select the right Honeywell C6097 pressure switch?

The C6097 series has two key variants based on how the switch trips: C6097A breaks on pressure fall — the circuit opens when pressure drops below the setpoint. This is used for low-gas-pressure cutoff, also called gas proving: the burner cannot fire if upstream gas pressure has fallen below the minimum safe operating level. Auto-reset versions re-close when pressure recovers; manual-reset versions require operator reset after a trip. C6097B breaks on pressure rise — the circuit opens when pressure exceeds the setpoint. Used for high-gas-pressure shutoff: cuts the burner circuit if supply pressure rises above safe limits. After choosing A or B, select the range model whose setpoint falls within the switch's marked adjustment range (e.g., 0.4"–5" W.C. for C6097A3004, or 1"–20" W.C. for C6097A3053). Memphis Control Center stocks 28 C6097 SKUs across all range and reset variants. Browse all C6097 models or call (901) 458-2000 for help selecting.

How do I select the right Honeywell Modutrol IV motor?

Modutrol IV selection comes down to five factors: (1) Control signal — Series 90 (135Ω) controllers use M9184 series motors; 4–20 mA DDC controllers use M7284 series; combustion firing rate systems use M9484 series; simple on/off applications use M4185 or M7285. (2) Voltage — 24V for M9184 and M9484; 120V for M7284, M4185, M6184, and M7285. (3) Torque — 60 lb-in for M4185, M6184, M7285; 150 lb-in for M9184, M7284, M9484. (4) Spring return or non-spring — spring return motors (M4185B, M7285C) drive to the end position on power loss; non-spring motors (M9184C, M7284) hold last position. (5) Auxiliary switches — M9184C1031 includes 2 internal aux switches; M9184A1019 has 1; M7285C1009 has 2; M4185B1009 has 1. Call (901) 458-2000 for help — we stock M9184, M7284, M9484, M4185, M6184, and M7285 series.

What are the T775 Series 2000 temperature controller model differences?

The T775 series has six model families: T775A/B — standard relay-output controllers (1 or 2 SPDT relays). T775M — modulating controllers with both relay and analog outputs (4–20 mA, 0–10 Vdc, 2–10 Vdc, or Series 90 signal). T775M2048 has 2 SPDT + 2 analog outputs; T775M2030 has 4 SPDT + 2 analog; T775M2014 is the NEMA 4X version (4 SPDT + 2 analog). T775P — boiler-specific model with 3 sensor inputs, 4 SPDT relays, and a dedicated pump output. T775U — universal model that accepts temperature, humidity, or pressure inputs. T775R — outdoor-air reset model with 4 SPDT relays plus 2 floating outputs. Selection factors: (1) Output type — relay-only or relay plus analog modulating; (2) Number of outputs needed; (3) Enclosure — NEMA 1 standard or NEMA 4X for wet/washdown locations; (4) Application — boiler sequencing (T775P), OA reset (T775R), modulating valve/damper control (T775M).

Related Categories

Flame Safety Controls Flame Scanners Actuators Thermostats Gas Valves & Controls Temperature Controls Boiler Controls Pressure Switches Ignition Controls Fireye Honeywell Eclipse Belimo Actuators

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