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65-0120—1 16

RM7838B

INSTALLATION

M3390A

(L1)

LIMITS

MAIN FUEL

VALVE(S)

10 SEC.

INTERRUPTED

PILOT/IGNITION

C7012A, C, E, F OR

C7076A, D ULTRAVIOLET

FLAME DETECTOR

120V, 60 HZ POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

120V ALARM

(HOT)

MASTER

SWITCH

C7027A, C7035A OR

C7044A ULTRAVIOLET

FLAME DETECTOR

BLUE

RECTIFYING FLAME ROD,

RECTIFYING PHOTOCELL,

OR INFRARED

(LEAD SULFIDE)

FLAME DETECTOR

YELLOW

WHITE

BLACK

Q7800 SUBBASE

DPST ALARM

SILENCING SWITCH

STOP

START

D C

HIGH FIRE

COMMON

LOW FIRE

MODULATE

SERIES 90

FIRING RATE

MOTOR

SERIES 90

CONTROLLER

PILOT VALVE

HOLD

MANUAL VALVE

OPEN SWITCH

LOW FIRE

START SWITCH

HIGH PURGE

RATE SWITCH

PREIGNITION

INTERLOCK

5 SECOND IGNITION

(EARLY SPARK

TERMINATION)

COMBUSTION

BLOWER AFS

RECIRCULATING

AFS

BURNER

CONTROL

RECIRCULATING

BLOWER

COMBUSTION

AIR FAN

S445

Fig. 8—RM7838B wiring with S445 start-stop station.

Table of Contents2
Specifications3
- Table 1-Terminal Ratings3
- Table 2-Flame Detection Systems4
- Fig. 1-Mounting Dimensions of the RM7838B Relay Module and Q7800A Subbase, in In. (MM)6
- Fig. 2-Mounting Dimensions of the RM7838B Relay Module and Q7800B Subbase, in In. (MM)6
- Fig. 3-Mounting Dimensions of the Keyboard Display Module in In. (MM)7
- Fig. 4-Rectification Detectors7
- Fig. 5-Ultraviolet Detectors8
- Fig. 6-Infrared Detectors9
Principal Technical Features10
Safety Provisions10
Installation12
Fig. 7-Internal Block Diagram of the RM7838B13
Checkout15
- Communication Interface Controlbus Module15
Fig. 8-RM7838B Wiring with S445 Start-Stop16
Fig. 9-RM7838B Wiring with Separate Start-Stop17
Fig. 10-RM7838B Wiring with Separate Start and Stop Stations with 4 to 20 Ma Firing Rate Control Circuit18
Fig. 11-Wiring the Keyboard Display Module with19
Fig. 12-Wiring for Multiple Keyboard Display19
Fig. 13-Electrical Panel Installation20
Fig. 14-Wall or Burner Installation20
Fig. 15-ST7800 Purge Card Installation20
Fig. 16-Keyboard Display Module Mounting21
Fig. 17-DATA CONTROLBUS MODULE21
- Mounting21
- Display Module22
Fig. 19-Flame Signal Amplifier Mounting22
Fig. 20-Flame Detector Wiring23
Operation25
Fig. 21-Operation of the RM7838B Relay25
Fig. 22-Operation of the RM7838B Relay26
- Module27
Fig. 23-Keyboard Display Module and Sequence27
Table 3-Sequence Status Display Information28
Fig. 24-( ◊ ) SCROLL Pushbutton Function29
Table 4-Selectable Messages30
Table 11-Selectable Messages30
Fig. 26-MODE Pushbutton Function30
Fig. 27-SAVE Function30
Table 5-Expanded Annunciator32
Static Checkout33
Table 6-Site Configurable Jumper Options33
Fig. 28-Selectable Site-Configurable Jumpers33
Table 7-Static Checkout34
Table 8-Flame Signal36
Fig. 29-Flame Signal Measurement36
Fig. 30-Flame-Out Timer Lockout39
Table 9-Sequence and Status Hold Messages42
Table 10-Accessing Historical and Diagnostic Selectable Messages45
Troubleshooting49
Table 12-Hold and Fault Message Summary49
Fig. 31-Lockout Message State49
Fig. 32-Lockout Message State49
Fig. 33-Lockout Message State 349
- Table 13-Expanded Annunciator Hold Codes52
- Table 14-Expanded Annunciator Fault Codes52
- Current Status Messages53
- Table 15-Expanded Annunciator Diagnostic53
Fig. 34-Flush Mounting of Keyboard Display Module Template54

Model	7800 SERIES
Category	Control Unit
Frequency	50/60 Hz
Approvals	UL, CE
Communication	Communication Interface (Optional)

Honeywell 7800 SERIES User Manual

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Honeywell 7800 SERIES Specifications

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