Honeywell EC7850A1072, EC7850A1080, EC7850A1122, RM7830A1029, RM7830A1003 Instruction Manual

EC7830A, RM7830A, EC7850A,
RM7850A
7800 SERIES Relay Modules

INSTALLATION INSTRUCTIONS

APPLICATION

The Honeywell EC/RM7830A and EC/RM7850A are
microprocessor-based integrated burner controls for
automatically fired gas, oil, or combination fuel single burner
full modulation (EC/RM7850A) or on/off (EC/RM7830A)
applications. The EC/RM7830A; EC/RM7850A system
consists of a relay module, subbase, amplifier, and purge
card. Options include keyboard display module (KDM),
Personal Computer Interface, Data ControlBus™ Module,
remote display mounting and Combustion System Manager
Software.

Functions provided by the EC/RM7830A and EC/RM7850A
include automatic burner sequencing, flame supervision,
system status indication, system or self-diagnostics and
troubleshooting. Text readout on the Keyboard Display
Module is available in English, Spanish, Portuguese,
Katakana (Japanese), French, German, and Italian
languages.

This document provides installation and static checkout
instructions. Other applicable publications are:
63-2278:Q7700 Network Interface Unit Product Data.

65-0084:Q7800A,B 22-Terminal Wiring Subbase

Product Data.

65-0090:S7800A Keyboard Display Module Product Data.

65-0091:S7810A Data ControlBus™ Module Product Data.

65-0095:S7820 Remote Reset Module Product Data.

65-0097:221729C Dust Cover Packing Instructions.

65-0102:ZM7850A Combustion System Manager

Operating Instructions.

65-0109:R7824, R7847, R7848, R7849, R7861, R7886 Flame

Amplifiers for the 7800 SERIES Product Data.

65-0131:221818A Extension Cable Assembly Product Data.

65-0228:S7810B Multi-Drop Switch Module Product Data.

65-0229:7800 SERIES Relay Modules Checkout and

Troubleshooting Product Data.

65-0249:S7810M ModBus Network Protocol.

®

®

SPECIFICATIONS

Electrical Ratings (See Tables 3A, 3B, 3C and 3D):

Voltage and Frequency:

RM7830A and RM7850A:

120 Vac (+10/-15%), 50/60 Hz (±10%).

EC7830A and EC7850A:

220/240 Vac (+10%/-15%), 50/60 Hz (±10%)
Power Dissipation: 10W maximum.
Maximum Total Connected Load: 2000 VA.
Fusing Total Connected Load: 15A maximum, Fast Blow, type

SC or equivalent.

Environmental Ratings:

Ambient Temperature:

Operating: -40°F to 140°F (-40°C to +60°C).

Storage: -40°F to 150°F (-40°C to +66°C).
Humidity: 85% relative humidity continuous, noncondensing.
Vibration: 0.5G environment.

SIL 3 Capable:

SIL 3 Capable in a properly designed Safety Instrumented

System. See form 65-0312 for Certificate Agreement

Approvals:

RM7830A and RM7850A:

Factory Mutual Approved: Report No. J.I.1V9A0.AF.

Swiss Re (formerly Industrial Risk Insurers): Acceptable.

Federal Communications Commission: Part 15,

Class B, Emissions.
EC7830A and EC7850A: Factory Mutual Approved.
These products also comply with the following European

directives:
Gas Appliance Directive: 90/396/EEC.
Low Voltage Directive: 73/23/EEC.
EMC Directive: 89/336/EEC.
GASTEC: CE-63AP3070/1.
Lloyds Register Approval.

Oil appliances:

EC7830A: DIN-5F 106/96.

EC7850A: DIN-5F 107/96.
These products are approved according to EN298, “Automatic
gas burner systems for gas burners and gas burning
appliances with or without fans.”

Please note the following to comply with EN60730 for remote
mounting of the KDM and/or remote reset module. It is
necessary to provide electrical separation using insulation at

SIL

Capable

3

66-1092-06

EC7830A, RM7830A, EC7850A, RM7850A 7800 SERIES RELAY MODULES

WARNING

WARNING

least equivalent to double or reinforced insulation. This can be
accomplished by either:

1. Optically isolating the communication and/or remote
reset lines from the control cabinet or

2. Providing physical separation from the communication
and/or remote reset lines using electrical conduit and a
204718A Remote Display Cover Assembly or other
suitable enclosure that meets ip40 class of protection.

INSTALLATION

When Installing this Product…

1. Read these instructions carefully. Failure to follow them

could damage the product or cause a hazardous
condition.

2. Check the ratings given in the instructions and marked
on the product to make sure the product is suitable for
the application.

3. Installer must be a trained, experienced, flame
safeguard service technician.

4. After installation is complete, check out the product
operation as provided in these instructions.

Fire or Explosion Hazard.
Can cause severe injury, death or property
damage.

Carefully follow safety requirements when installing a
burner control.

Electrical Shock Hazard or Equipment Damage
Hazard.
Can cause severe injury, death or equipment
damage.

Disconnect power supply before beginning installation.
More than one disconnect may be involved.

Location

Humidity

Install the relay module where the relative humidity never
reaches the saturation point. The relay module is designed to
operate in a maximum 85% relative humidity continuous,
noncondensing, moisture environment. Condensing moisture
can cause a safety shutdown.

Vibration

Do not install the relay module where it can be subjected to
vibration in excess of 0.5G continuous maximum vibration.

Weather

The relay module is not designed to be weather tight. When
installed outdoors, protect the relay module in an approved
weather-tight enclosure.

IMPORTANT

1. Wiring connections for the relay modules are unique;

refer to Fig. 3 and 4 or the appropriate Specifications for
individual subbase wiring.

2. Wiring must comply with all applicable codes, ordi­nances and regulations.

3. Wiring must comply with NEC Class 1
(Line Voltage) wiring.

4. Loads connected to the EC/RM7830A and
EC/RM7850A must not exceed those listed on the relay
module label or the Specifications; see Table 1.

5. Limits and interlocks must be rated to simultaneously
carry and break current to the ignition transformer, pilot
valve, and main fuel valve(s).

6. All external timers must be listed or
component-recognized by authorities who have proper
jurisdiction.

7. For on-off gas-fired systems, some authorities who
have jurisdiction prohibit the wiring of any limit or
operating contacts in series between the flame
safeguard control and the main fuel valve(s).

8. Two flame detectors can be connected in parallel with
the exception of C7015 Infrared Flame Detectors.

9. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in
accordance with the instructions, can cause
interference with radio communications. It has been
tested and found to comply with the limits for a Class B
computing device of Part 15 of FCC rules, which are
designed to provide reasonable protection against such
interference when operated in a commercial
environment. Operation of this equipment in a
residential area can cause interference, in which case,
the users, at their own expense, may be required to take
whatever measures are required to correct this
interference.

10. This digital apparatus does not exceed the Class B
limits for radio noise for digital apparatus set out in the
Radio Interference Regulations of the Canadian
Department of Communications.

Mounting Wiring Subbase

1. Mount the subbase in any position except horizontally

with the bifurcated contacts pointing down. The
standard vertical position is recommended. Any other
position decreases the maximum ambient temperature
rating.

2. Select a location on a wall, burner or electrical panel.
The Q7800 can be mounted directly in the control
cabinet. Be sure to allow adequate clearance for
service, installation, access or removal of the relay
module, expanded annunciator, KDM, flame amplifier,
flame amplifier signal voltage probes, run/test switch,
electrical signal voltage probes and electrical field
connections.

3. For surface mounting, use the back of the subbase as a
template to mark the four screw locations, then drill the
pilot holes.

4. Securely mount the subbase using four no. 6 screws
(not provided).

66-1092—06 2

EC7830A, RM7830A, EC7850A, RM7850A 7800 SERIES RELAY MODULES

WARNING

Wiring Subbase

Electrical Shock Hazard or Equipment Damage
Hazard.
Can cause sever injury, death or equipment
damage.

Disconnect the power supply before beginning
installation. More than one disconnect may be
involved.

The internal block diagram of the EC/RM7830A is shown in
Fig. 1 and the internal block diagram of the EC/RM7850A is
shown in Fig. 2.

1. For subbase wiring and sequence charts, refer to Fig. 3
and 4.

2. For remote wiring of the KDM, refer to the Specifications
for the KDM (65-0090), Network Interface Unit
(63-2278), Data ControlBus™ Module (65-0091),
S7810M ModBus Module (65-0249) or Extension Cable
Assembly (65-0131).

3. Disconnect the power supply from the main disconnect
before beginning installation to prevent electrical shock
and equipment damage. More than one disconnect can
be required.

4. All wiring must comply with all applicable electrical
codes, ordinances and regulations. Wiring, where
required, must comply with NEC Class 1 (Line Voltage)
wiring.

5. For recommended wire size and type, see Table 1.

6. Recommended wire routing of leadwires:

a. Do not run high voltage ignition transformer wires in

the same conduit with the flame detector, Data
ControlBus™ Module, or Remote Reset Module
wiring.

b. Do not route flame detector, Data ControlBus™

Module, or Remote Reset Module leadwires in
conduit with line voltage circuits.

c. Enclose flame detector leadwires without armor

cable in metal cable or conduit.

d. Follow directions in flame detector, Data Control-

Bus™ Module, or Remote Reset Module Instruc­tions.

7. For recommended grounding practices, see Table 2.

8. The KDM is powered from a low voltage, energy limited

source. Mount the KDM outside of a control panel when
it is protected from mechanical damage.

IMPORTANT

A 13 Vdc power supply must be used any time more
than one KDM is used. A maximum of two KDM,
Data ControlBus™ Modules or S7810B Multi-Drop
Switch Modules are allowed in any combination.

9. Maximum wire lengths:
a. EC/RM7830A and EC/RM7850A leadwires: The

maximum leadwire length is 300 feet (91 meters) to
terminal inputs (Control, Running/Lockout Interlock).

b. Flame Detector leadwires: The maximum flame

sensor leadwire length is limited by the flame signal
strength.

c. Remote Reset leadwires: The maximum length of

wire is 1000 feet (305 meters) to a Remote Reset
pushbutton.

d. Data ControlBus™ Module: The maximum Data

ControlBus™ Module cable length depends on the
number of system modules connected, the noise
conditions and the cable used. The maximum length
of all Data ControlBus™ Module interconnecting
wire is 4000 feet (1219 meters).

10. Be sure loads do not exceed the terminal ratings. Refer
to the label on the relay module or to the terminal
ratings in Tables 3A, 3B, 3C and 3D.

3 66-1092—06

EC7830A, RM7830A, EC7850A, RM7850A 7800 SERIES RELAY MODULES

L1
HOT

N

1

5

2

CONFIGURATION
JUMPERS

PLUG-IN PURGE
TIMER CARD

F

G

22

PLUG-IN
FLAME
AMPLIFIER

MICROCOMPUTER

RUN/TEST
SWITCH

RESET
PUSHBUTTON

FLAME SIGNAL

TEST
JACK

RELAY
DRIVE
CIRCUIT

1K

2K

3K
4K

5K

6K
7K

CONTROL
POWER

POWER SUPPLY

17

RELAY
STATUS
FEEDBACK
AND LINE
VOLTAGE
INPUTS

10

8

21

9

4

3

OPTIONAL KEYBOARD
DISPLAY MODULE

RS485

16

1K1

2K2 5K1

4K1

7K1

2K1

PV1

PV2

MV

3K1

6K1

7

ES2

3K2

SAFETY RELAY
CIRCUIT

20 6

FAN

AL

IGN

AL

DDL

REMOTE
RESET

INDICATES FEEDBACK SENSING
OF RELAY CONTACT STATUS
AND LINE VOLTAGE INPUTS

RELAY CONTACT OPEN

INTERNAL WIRING

FIELD WIRING

RELAY COIL

RELAY CONTACT CLOSED

DDL
COMMUNICATIONS

1

2

3

5

USER TERMINALS

1

2

2

120 VAC, 50/60 Hz POWER SUPPLY, RM7830A; 220-240 VAC, 50/60 Hz POWER SUPPLY, EC7830A.
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

TO CONNECT L1 DIRECTLY TO LOS, AT LEAST ONE CONTROLLED SHUTDOWN MUST BE PROVIDED EVERY 24 HOURS.

M15183B

STATUS
LEDS

RTLOS

LD2

SHUTTER

SAFETY RELAY
CIRCUIT

F

G

...

22

66-1092—06 4

Fig. 1. Internal block diagram of EC/RM7830A (see Fig. 3 for detailed wiring instructions).

L1
HOT

N

1

4

2

19

CONFIGURATION
JUMPERS

PLUG-IN PURGE
TIMER CARD

F

G

22

PLUG-IN
FLAME
AMPLIFIER

MICROCOMPUTER

RUN/TEST
SWITCH

RESET
PUSHBUTTON

FLAME SIGNAL

TEST
JACK

RELAY
DRIVE
CIRCUIT

1K

2K

3K

4K

5K

6K

7K

8K

9K

CONTROL
POWER

POWER SUPPLY

18

17

RELAY
STATUS
FEEDBACK
AND LINE
VOLTAGE
INPUTS

10

8

21

9

5

3

OPTIONAL KEYBOARD
DISPLAY MODULE

RS485

16

1K1

2K2 5K1

4K1

7K1

2K1

PV1

PV2

MV

3K1

6K1

7

ES1

ES3

ES2

3K2

SAFETY RELAY
CIRCUIT

20 6

FAN

AL

IGN

AL

DDL

13

15

14

12

HIGH FIRE

COMMON

LOW FIRE

MODULATE

REMOTE
RESET

8K1

8K2

9K2

9K1

INDICATES FEEDBACK SENSING
OF RELAY CONTACT STATUS
AND LINE VOLTAGE INPUTS

RELAY CONTACT OPEN

INTERNAL WIRING

FIELD WIRING

RELAY COIL

RELAY CONTACT CLOSED

DDL
COMMUNICATIONS

1

2

3

5

USER TERMINALS

1

2

2

120 VAC, 50/60 Hz POWER SUPPLY, RM7850A; 220-240 VAC,
50/60 Hz POWER SUPPLY, EC7850A. PROVIDE DISCONNECT
MEANS AND OVERLOAD PROTECTION AS REQUIRED.

TO CONNECT L1 DIRECTLY TO LOS, AT LEAST ONE CONTROLLED
SHUTDOWN MUST BE PROVIDED EVERY 24 HOURS.

M15184B

STATUS
LEDS

RTLOS

LD2

SHUTTER

FG

...

22

Fig. 2. Internal block diagram of EC/RM7850A (see Fig. 4 for detailed wiring instructions).

EC7830A, RM7830A, EC7850A, RM7850A 7800 SERIES RELAY MODULES

5 66-1092—06

EC7830A, RM7830A, EC7850A, RM7850A 7800 SERIES RELAY MODULES

L1

N

1

G 12

N 13

3 14

4 15

5 16

6 17

7 18

8 19

(L1)

9 20

10 21

F 22

AL

FAN

RT

LD2

PV1

MV

IGN

ES2

LOS

PV2

FLAME
DETECTOR

1

12O VAC, 50/60 Hz POWER SUPPLY (RM7830A). 220-240 VAC, 50/60 Hz POWER SUPPLY
(EC7830A). PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

SEE FLAME DETECTOR INSTRUCTIONS FOR CORRECT WIRING.

LEGEND

ALARM
(NORMALLY OPEN)

PREIGNITION
INTERLOCK INPUT

BURNER/BLOWER
MOTOR

IGNITION

LINE VOLTAGE SUPPLY

LOCKOUT INPUT

AIRFLOW SWITCH INPUT

MAIN FUEL VALVE

PILOT VALVE 1
(INTERRUPTED)

PILOT VALVE 2
(INTERMITTENT)

LIMITS AND BURNER
CONTROL

AL

ES2

FAN

IGN

L1

LOS

LD2

MV

PV1

Q7800

2

2

INITIATE

POWER

PILOT

FLAME

MAIN

ALARM

STANDBY

RUN

STANDBY

PRE
IGNITION

PILOT
STABIL.

MAIN
STABIL.

IGNITION

BURNER

POSTPURGE

MAIN VALVE

LIMITS AND BURNER CONTROL CLOSED

LOCKOUT INPUT

10 sec

AIRFLOW SWITCH CHECK

PILOT VALVE

V2

PREIGNITION INTERLOCK

OPTIONS

SAFE START CHECK

FLAME PROVING

3 sec

5 sec

5 sec

1 IF ON AT CALL FOR HEAT, HOLD (120 sec). LOCK OUT IF STILL ON.

3 or 5 sec

3 or 5 sec

SAFE START CHECK

IF OFF AFTER 10 SEC OF FAN, LOCK OUT.

2

2, 15 or 30 sec

3

4

5

TAKE LOCKOUT ACTION, CONTINUE POSTPURGE TIMING.

SELECT VIA ST7800A PURGE TIMER CARD.

4

5

6

SELECT VIA CONFIGURATION JUMPERS OR MODEL NUMBERS.

AFS CHK

1

2 sec

AFS CHK

AFS CHK

DUE TO ONE EXTRA SECOND FOR SAFETY RELAY TEST, TIMING CAN VARY FROM 3 TO 4 SECONDS.

6

LED
DISPLAY

"PREPURGE"

WAITING

FIRST SAFETY

TIME

MAIN TRIAL

TIME

OPERATING
CONTROLS
AND
INTERLOCKS

FLAME
SIGNAL

EC/RM7830A Power Burner ON/OFF, GAS or OIL Sequence

2

3

6

6

M15185B

PV2

RT

8

21

9

6

20

7

10

17

BURNER/BLOWER MOTOR

4

66-1092—06 6

Fig. 3. Wiring subbase and sequence chart for EC/RM7830A.

EC7830A, RM7830A, EC7850A, RM7850A 7800 SERIES RELAY MODULES

SERIES 90

Q7800

G 12

N 13

AL

FAN

RT

LD2

PV1

MV

IGN

2

FLAME
DETECTOR

120 VAC, 50/60 HZ POWER SUPPLY, RM7850A; 220-240 VAC, 50/60 HZ POWER SUPPLY, EC7850A.

1

2

SEE FLAME DETECTOR INSTRUCTIONS FOR CORRECT WIRING.

3 14

(L1)

4 15

5 16

6 17

7 18

8 19

9 20

10 21

F 22

HIGH FIRE

COMMON

MODULATE

LOW FIRE

ES2

ES1

ES3

LOS

PV2

FIRING RATE
MOTOR

SERIES 90
CONTROLLER

B

R

W

B

R

W

1

L1

N

EC/RM7850A Power Burner Full Modulation, GAS or OIL Sequence

LED
DISPLAY

POWER

PILOT

FLAME

MAIN

ALARM

BURNER

INITIATE

STANDBY

PURGE

DRIVE

OR

TO HIGH

WAITING

FIRE

BURNER/BLOWER MOTOR

DRIVE
TO LOW
FIRE

PRE

IGNITION

IGNITION

FIRST
SAFETY
TIME

10

PILOT
STABIL.

5

MAIN
TRIAL
TIME

MAIN
STABIL.

LEGEND

ALARM

AL

(NORMALLY OPEN)

LOW FIRE SWITCH

ES1

INPUT
PREIGNITION

ES2

INTERLOCK INPUT
HIGH FIRE SWITCH

ES3

INPUT
BURNER/BLOWER

FAN

MOTOR
IGNITION

IGN

LINE VOLTAGE SUPPLY

L1

LOCKOUT INPUT

LOS

AIRFLOW SWITCH INPUT

LD2

MAIN FUEL VALVE

MV

PILOT VALVE 1

PV1

(INTERRUPTED)

PV2

PILOT VALVE 2
(INTERMITTENT)

LIMITS AND BURNER

RT

CONTROL

RUN

POSTPURGE

STANDBY

OPERATING
CONTROLS
AND
INTERLOCKS

AFS CHK

FLAME
SIGNAL

MOD

HF

LF

MOTOR

2 sec

OPTIONS

1 IF ON AT CALL FOR HEAT, HOLD (120 SEC). LOCK OUT IF STILL ON.

2

IF OFF AFTER 10 SEC OF FAN, LOCK OUT.

3

TAKE LOCKOUT ACTION. CONTINUE POSTPURGE TIMING.

4

SELECT VIA ST7800A PURGE TIMER CARD.

AFS CHK

PREIGNITION INTERLOCK

LIMITS AND BURNER CONTROL CLOSED

LOCKOUT INPUT

10 sec

2

1

SAFE START CHECK

AIRFLOW SWITCH CHECK

HF Sw LF Switch

LF

4

PILOT VALVE

V2

21

17

FLAME PROVING

56

3 sec 5 sec

7

3 or 5 sec 3 or 5 sec

DUE TO ONE EXTRA SECOND FOR SAFETY RELAY TEST,

5

TIMING CAN VARY FROM 3 TO 4 SEC.

6

SELECTION VIA CONFIGURATION JUMPERS OR MODEL NUMBERS.

EC7850A1148/RM7850A1035 IS 3 OR 2 SELECTED VIA

7

CONFIGURATION JUMPER.

8

MAIN VALVE

1819

6 6

5 sec

9

6

20

7

MODHF

3

AFS CHK

SAFE START CHECK

2, 15 or 30 sec

M23304

7 66-1092—06

EC7830A, RM7830A, EC7850A, RM7850A 7800 SERIES RELAY MODULES

Fig. 4. Wiring subbase and sequence chart for EC/RM7850A.

Table 1. Recommended Wire Sizes and Part Numbers.

Application Recommended Wire Size Recommended Part Numbers

Line Voltage Terminals 14, 16, or 18 AWG copper conductor, 600 volt

insulation, moisture-resistant wire.

a

KDM

Data ControlBus™ Module

Remote Reset Module 22 AWG two-wire twisted pair, insulated for low voltage. —

Communications Interface
ControlBus™ Module

13 Vdc full wave rectified
transformer power input

a

The KDM, Data ControlBus™ Module (for remote mounting or communications) or Communication Interface ControlBus™

Module must be wired in a daisy chain configuration, (1(a)-1(a), 2(b)-2(b), 3(c)-3(c)). The order of interconnection of all the
devices listed above is not important. Be aware that modules on the closest and farthest end of the daisy chain configuration
string require a 120 ohm (1/4 watt minimum) resistor termination across terminals 1 and 2 of the electrical connectors for
connections over 100 feet (30.5 meters).

Ground Type Recommended Practice

Earth ground (subbase and relay
module)

Signal Ground (KDM, Data
ControlBus™ Module,
Communications Interface
ControlBus™ Module)

22 AWG two-wire twisted pair with ground, or five-wire. Belden 8723 shielded cable or equivalent.

22 AWG two-wire twisted pair with ground. Belden 8723 shielded cable or equivalent.

18 AWG wire insulated for voltages and temperatures
for given application.

Table 2. Recommended Grounding Practices.

1. Use to provide a connection between the subbase and the control panel of the

equipment. Earth ground must be capable of conducting enough current to blow
the 15A fuse (or breaker) in the event of an internal short circuit.

2. Use wide straps or brackets to provide minimum-length, maximum-surface area
ground conductors. If a leadwire must be used, use 14 AWG copper wire.

3. Make sure that mechanically tightened joints along the ground path are free of
nonconductive coatings and protected against corrosion on mating surfaces.

Use the shield of the signal wire to ground the device to the signal ground terminal 3(c)
of each device. Connect the shield at both ends of the daisy chain to earth ground.

TTW60C, THW75C, THHN90C.

TTW60C, THW75C, THHN90C.

Final Wiring Check

1. Check the power supply circuit. The voltage and fre-

quency tolerance must match those of the relay module.
(A separate power supply circuit can be required for the
relay module.) Add the required disconnect means and
overload protection.

2. Check all wiring circuits and complete the Static
Checkout in Table 5 or 6 before installing the relay
module on the subbase.

3. Install the relay module.

4. Restore power to the panel.

Mounting EC/RM7830A; EC/
RM7850A Relay Module

1. Mount the relay module vertically on the Q7800

Subbase, or mount horizontally with the knife blade
terminals pointing down. When mounted on the
Q7800A, the relay module must be in an electrical
enclosure.

2. When mounting in an electrical enclosure, provide
adequate clearance for servicing, installation and
removal of the relay module, KDM, flame amplifier,
flame amplifier signal voltage probes, electrical signal
voltage probes and electrical connections.

a. Allow an additional 2 in. (51 mm) below the relay

module for the flame amplifier mounting.

b. Allow an optional 3 in. (76 mm) minimum on both

sides of the relay module for electrical signal voltage
probes.

3. Make sure no subbase wiring is projecting beyond the
terminal blocks. Tuck in wiring against the back of the
subbase so it does not interfere with the knife blade
terminals or bifurcated contacts.

IMPORTANT

Install the relay module with a plug-in motion rather
than a hinge action.

4. Mount the relay module by aligning the four L shaped
corner guides and knife blade terminals with the
bifurcated contacts on the wiring subbase and securely
tightening the two screws without deforming the plastic.

STATIC CHECKOUT

After checking all wiring, perform this checkout before
installing the relay module on the wiring subbase. These tests
verify that the Q7800 Wiring Subbase is wired correctly and

66-1092—06 8

EC7830A, RM7830A, EC7850A, RM7850A 7800 SERIES RELAY MODULES

the external controllers, limits, interlocks, actuators, valves,

For further checkout and troubleshooting, see form 65-0229.
transformers, motors and other devices are operating
properly.

Table 3. EC7830A/RM7830A Terminal Ratings.

Terminal

No. Abbreviation Description

G—

Earth G —

Flame Sensor Ground

Earth Ground

a

RM7830A (120 Vac) EC7830A (220/230/240 Vac)

a

——

——

Ratings

N — Line Voltage Common (Neutral) — —

3 AL Alarm (Normally Open) 1A, 10A inrush for 5000 cycles. 1A, 10A inrush for 5000 cycles.

4 FAN Burner/Blower Motor

4A at PF = 0.5, 20A inrush.

5 L1 Line Voltage Supply (L1) 120 Vac(+10%/-15%), 50/60 Hz

(±10%).

c

b

4A at PF = 0.5, 20A inrush.

220 to 240 Vac (+10%/-15%),
50/60 Hz (±10%).

c

6 RT Limits and Burner Control 1 mA 1 mA maximum

7 LD2 Airflow Switch Input 5A. 5A.

8 PV1 Pilot Valve 1 (Interrupted) 4A at PF = 0.5, 20A inrush. 4A at PF = 0.5, 20A inrush.

9 MV Main Fuel Valve 4A at PF = 0.5, 20A inrush. 4A at PF = 0.5, 20A inrush.

10 IGN Ignition 2A at PF = 0.2. 2A at PF = 0.2.

F (11) — Flame Signal 60 to 220 Vac, current limited. 60 to 220 Vac, current limited.

12 to 15 Not Used.

16 — Control Voltage

120 Vac (+10%/-15%).

17 ES2 Preignition Interlock Input 1 mA.

d

220 to 240 Vac (+10%/-15%).

d

1 mA.

18 to 19 Not Used.

20 LOS Lockout Input. 1 mA. 1 mA.

21 PV2 Pilot Valve 2 (intermittent) 4A at PF = 0.5, 20A inrush. 4A at PF = 0.5, 20A inrush.

22 SHTR Shutter Shutter drive for dynamic self-

check flame sensor.

a

See Table 2.

b

Honeywell has tested this output at 9.8A at PF = 0.5, 58.8A inrush for 100,000 cycles (EN298 approval does not require this

Shutter drive for dynamic
self-check flame sensor.

e

test).

c

2000 VA maximum connected load to relay module.

d

1A, 10A inrush for 5000 cycles; carry 5A for 250,000 cycles.

e

220/240 Vac to 120 Vac, 10 VA stepdown transformer (not provided) must be used to drive the shutter.

d

9 66-1092—06

EC7830A, RM7830A, EC7850A, RM7850A 7800 SERIES RELAY MODULES

WARNING

Table 4. EC7850A/RM7850A Terminal Ratings.

Terminal

No. Abbreviation Description RM7850A (120 Vac) EC7850A (220/230/240 Vac)

G—

Earth G —

Flame Sensor Ground.

Earth Ground.

a

a

——

——

N — Line Voltage Common (Neutral) — —

3 AL Alarm (Normally Open) 1A, 10A inrush for 5000

cycles.

4 L1 Line Voltage Supply (L1) 120 Vac (+10%/-15%), 50/60

b

5 FAN Burner/Blower Motor

Hz (±10%).

4A at PF = 0.5, 20A inrush.

1A, 10A inrush for 5000
cycles.

220/230/240 Vac (+10%/­15%), 50/60 Hz (±10%).

c

4A at PF = 0.5, 20A inrush.

b

6 RT Limits and Burner Control 1 mA. 1 mA.

7 LD2 Airflow Switch Input 5A. 5A.

8 pv1 Pilot Valve 1 (Interrupted)

9 MV Main Fuel Valve

4A at PF = 0.5, 20A inrush.

4A at PF = 0.5, 20A inrush.

d

4A at PF = 0.5, 20A inrush.

d

4A at PF = 0.5, 20A inrush.

e

e

10 IGN Ignition 2A at PF = 0.2. 2A at PF = 0.2.

F (11) — Flame Signal 60 to 220 Vac, current limited. 136 to 220 Vac, current limited.

12 HI Firing Rate High Fire

13 COM Firing Rate Common

14 MOD Firing Rate Modulate

15 LO Firing Rate Low Fire

0.5A at PF = 0.5.

0.5A at PF = 0.5.

0.5A at PF = 0.5.

0.5A at PF = 0.5.

f



f

f

16 — Alarm (Normally Closed) 1A, 10A inrush for 5000

cycles; carry 5A for 250,000
cycles.

0.5A at PF = 0.5.

0.5A at PF = 0.5.

0.5A at PF = 0.5.

0.5A at PF = 0.5.

1A, 10A inrush for 5000
cycles; carry 5A for 250,000
cycles.

f

f

f

f

17 ES2 Preignition Interlock Input 1 mA. 1 mA.

18 ES1 Low Fire Switch Input 1 mA. 1 mA.

19 ES3 High Fire Switch Input 1 mA. 1 mA.

20 LOS Lockout Input 1 mA. 1 mA.

21 PV2 Pilot Valve 2 (Intermittent)

4A at PF = 0.5, 20A inrush.

22 SHTR Shutter Shutter drive for dynamic

self-check flame sensor.

a

See Table 2.

b

2000 VA maximum connected load to relay module.

c

Honeywell has tested this output at 9.8A at PF = 0.5, 58.8A inrush for 100,000 cycles

d

4A at PF = 0.5, 20A inrush.

Shutter drive for dynamic
self-check flame sensor.

e

g

(EN298 approval does not require this test).

d

Total load current, excluding Burner/Boiler Motor and Firing Rate Outputs cannot exceed 5A, 25A inrush.

e

Total load current, excluding Burner/Boiler Motor and Firing Rate Outputs cannot exceed 5A, 25A inrush for 250,000 cycles.

f

Can also be 24 Vac, 3A at PF = 0.5.

g

220/240 Vac to 120 Vac, 10 VA stepdown transformer (not provided) must be used to drive the shutter.

Fire or Explosion Hazard.
Can cause severe injury, death, or property
damage.

Close all manual fuel shutoff valves before starting this
test to prevent an explosion.

66-1092—06 10

EC7830A, RM7830A, EC7850A, RM7850A 7800 SERIES RELAY MODULES

WARNING

CAUTION

Electrical Shock Hazard.
Can cause severe injury, death, or property
damage.

Use extreme care when testing the system. Line
voltage is present on most terminal connections when
power is on. Ensure proper selection of configuration
jumpers before starting the burner operation.

Equipment Damage Hazard.
Improper testing can cause equipment damage.

Do not perform a dielectric test with the relay module
installed. Internal surge protectors break down and
conduct a current. This can cause the relay module to
fail the dielectric test or destroy the internal lightning
and high current protection.

1. Open the master switch before installing or removing a
jumper on the subbase.

2. Before continuing to the next test, be sure to remove
test jumper(s) used in the previous test.

3. Replace all limits and interlocks that are not operating
properly. Do not bypass limits and interlocks.

Equipment Recommended

Voltmeter (1M ohm/volt minimum sensitivity) set on the 0 to
300 Vac scale and two jumper wires, No. 14 wire, insulated,
12 in. (304.8 mm) long with insulated alligator clips at both
ends.

General Instructions

1. Perform all applicable tests listed in the Static Checkout,

Table 4 or 5, in the order listed.

2. Make sure all manual fuel shutoff valves are closed.

3. For each test, open the master switch and install the

jumper wire(s) between the subbase wiring terminals
listed in the Test Jumpers column.

4. Close the master switch before observing operation.

5. Read the voltage between the subbase wiring terminals

listed in the Voltmeter column.

6. If there is no voltage or the operation is abnormal, check
the circuits and external devices as described in the last
column.

7. Check all wiring for correct connections, tight terminal
screws, correct wire, and proper wiring techniques.

8. Replace all damaged or incorrectly sized wires.

9. Replace faulty controllers, limits, interlocks, actuators,

valves, transformers, motors and other devices, as
required.

10. Make sure normal operation is obtained for each
required test before continuing the checkout.

11. After completing each test, be sure to open the master
switch and remove the test jumper(s).

Table 5. EC/RM7830A Static Checkout.

Test

No.

1 None 5-L2 Line voltage at terminal 5. 1. Master switch.

2 None 17-L2 Line voltage at terminal 17. Preignition interlocks.

3 5-16 — Alarm (if used) turns on. Alarm.

NOTE: Disconnect horn at this time (if used).

4 5-16 2-20 Line voltage at terminal 20. Limits in Lockout Circuit.

5 5-16 2-6 Line voltage at terminal 6. 1. Recycle limits.

65-16

NOTE: Remove jumpers and reconnect alarm (if used).

7 5-10 — Ignition spark (if ignition transformer is

Test

Jumpers Voltmeter Normal Operation

2-7 1. Fan (Burner Motor or Blower) starts.

5-4

2. Line voltage at terminal 7.

connected to terminal 10).

If Operation is Abnormal, Check the Items

Listed Below

2. Power connected to the master switch.

3. Overload protection (fuse, circuit breaker,

etc.) opened the power line.

2. Burner control.

1. Fan circuit.

a. Manual Fan Switch.
b. Fan power supply, overload protection

and starter.

c. Fan.

2. Running Limits or Airflow Switch (LD2
input).

1. Watch for spark or listen for buzz.
a. Ignition electrodes are clean.
b. Ignition transformer is okay.

11 66-1092—06

EC7830A, RM7830A, EC7850A, RM7850A 7800 SERIES RELAY MODULES

CAUTION

Table 5. EC/RM7830A Static Checkout. (Continued)

Test

No.

85-8 — 1. Ignition spark (if ignition transformer

9 5-21 — Same as test no. 8 for connections to

10 5-9 — Automatic fuel valve(s) open(s).

Final

Test

Jumpers Voltmeter Normal Operation

is connected to terminal 8).

2. Automatic pilot valve opens (if con­nected to terminal 8).

NOTE: Refer to wiring diagram of system

being tested.

terminal 8. If using direct spark ignition,
check the first stage fuel valve(s) instead of
the pilot valve.

If using direct spark ignition on a model
with intermittent pilot on terminal 21, check
the optional second stage fuel valve, if
used.

Equipment Damage Hazard.
Failure to remove jumpers can damage equipment.

After completing these tests, open the master switch and remove ALL test jumpers from the subbase terminals.
Then remove bypass jumpers from the low fuel pressure limits (if used).

If Operation is Abnormal, Check the Items

Listed Below

1. Watch for spark or listen for buzz.

a. Ignition electrodes are clean.
b. Ignition transformer is okay.

2. Listen for click of fee head of valve for
activation.
a. Actuator, if used.
b. Pilot valve.

Same as test no. 8. If using direct spark ignition,
check the first stage fuel valve(s) instead of the
pilot valve.

1. Listen for and observe operation of the
main fuel valve(s) and actuator(s).

2. Valve(s) and actuator(s).

Table 6. EC/RM7850A Static Checkout.

Test

No.

1 None 4-2 Line voltage at terminal 4. 1. Master switch.

2 None 17-2 Line voltage at terminal 17. Preignition interlocks.

3 4-16 — Alarm (if used) turns on. Alarm.

NOTE: Disconnect horn at this time (if used).

4 4-16 2-20 Line voltage at terminal 20. Limits in Lockout Circuit.

5 4-16 2-6 Line voltage at terminal 6. 1. Recycle limits.

64-16

NOTE: Remove jumpers and re-connect alarm (if used).

7 4-10 — Ignition spark (if ignition transformer is

8 4-8 — Ignition spark (if ignition transformer is

Test

Jumpers Voltmeter Normal Operation If Operation is Abnormal, Check These Items

2. Power connected to the master switch.

3. Overload protection (fuse, circuit breaker, etc.)

did not open the power line.

2. Burner control.

5-4

2-7 1. Fan (Burner Motor or Blower) starts.

2. Line voltage at terminal 7.

connected to terminal 10).

connected to terminal 8).
Automatic pilot valve opens (if connected
to terminal 8).
Refer to wiring diagram of system being
tested.

1. Fan circuit.
a. Manual fan switch.
b. Fan power supply, overload protection and

starter.

c. Fan.

2. Running limits of Airflow Switch (LD2) input.

1. Watch for spark or listen for buzz.

a. Ignition electrodes are clean.
b. Ignition transformer is okay.

1. Watch for spark or listen for buzz.
a. Ignition electrodes are clean.
b. Ignition transformer is okay.

2. Listen for click of fee head of valve for
activation.
a. Actuator, if used.
b. Pilot valve.

66-1092—06 12

EC7830A, RM7830A, EC7850A, RM7850A 7800 SERIES RELAY MODULES

WARNING

CAUTION

Table 6. EC/RM7850A Static Checkout. (Continued)

Test

No.

9 4-21 — Same test as no. 4 for connections to

10 4-9 — Automatic main fuel valve(s) open(s). If

11 12-13 18-L2 Voltmeter reads line voltage, then zero

12 12-13 19-L2 Firing rate motor drives open; line voltage

13 14-13 19-L2 Firing rate motor drives closed; zero volts

14 15-13 — 1. Raise setpoint of Series 90

Final

Test

Jumpers Voltmeter Normal Operation If Operation is Abnormal, Check These Items

terminal 8. If using direct spark ignition,
check the first stage fuel valve(s) instead
of the pilot valve.

using direct spark ignition on a model with
intermittent pilot on terminal 21, check the
optional second stage fuel valve, if used.

volts on terminal 18 after motor starts
driving open.

at terminal 19 after motor is in High Fire
position.

at terminal 19 after motor starts driving
closed.

controller—firing rate motor should
drive toward open.

2. Lower setpoint of Series 90
controller—firing rate motor should
drive toward closed.

Same as test no. 4. If using direct spark ignition,
check the first stage fuel valve(s) instead of the pilot
valve.

1. Listen for and observe operation of the main
fuel valve(s) and actuator(s).

2. Valve(s) and actuator(s).

1. Low Fire Start Switch.

2. Firing rate motor and transformer.

1. High Fire Purge Switch.

2. Firing rate motor and transformer.

1. Low Fire Start Switch.

2. Firing rate motor and transformer.

1. Series 90 controller.

2. Firing rate motor and transformer.

Equipment Damage Hazard.
Failure to remove jumpers can damage equipment.

After completing these tests, open the master switch and remove all test jumpers from the subbase terminals.
Also, remove bypass jumpers from the low fuel pressure limits (if used).

Explosion hazard.
Can cause serious injury or death.

Be sure all manual fuel shutoff valves are closed.

Mounting Other System Components
(Fig. 5)

Refer to the applicable specifications for mounting other
system components.

PRINCIPAL TECHNICAL
FEATURES

The EC/RM7830A or EC/RM7850A Relay Module provide all
customary flame safeguard functions as well as significant
advancements in safety, annunciation, and system
diagnostics.

Safety Shutdown (Lockout) Occurs
If:

1. INITIATE Period

a. Purge card is not installed or removed.
b. Purge card is defective.
c. Configuration jumpers were changed (after 200

hours of operation).
d. AC line power errors, see Operation.
e. Four minute INITIATE period is exceeded.

2. STANDBY Period
a. Flame signal is present after 40 seconds.
b. Preignition Interlock is open an accumulative time of

30 seconds.

c. Airflow Switch feature is enabled and the Airflow

Switch is closed for 120 seconds with Limits and
Burner Control closed.

d. Ignition/pilot valve/intermittent pilot valve terminal is

energized.
e. Main valve terminal is energized.
f. Internal system fault.
g. Purge card is not installed or removed.
h. Purge card is defective.
i. Lockout Input opens during STANDBY.

3. PURGE Period
a. Preignition Interlock opens anytime during purge.
b. Flame signal detected during purge.
c. High Fire Switch fails to close within five minutes

after the firing rate motor is commanded to drive to
high fire position at start of purge (EC/RM7850A).

13 66-1092—06

EC7830A, RM7830A, EC7850A, RM7850A 7800 SERIES RELAY MODULES

d. Low Fire Switch fails to close within five minutes,

after firing rate motor is commanded to drive to low
fire position at end of purge (EC/RM7850A).

e. Airflow Switch Input does not close within 10

seconds.

f. If Airflow Switch is disabled, there is no jumper

between terminals 6 and 7.
g. Airflow Switch opens during PURGE.
h. Lockout Input opens during purge.
i. Ignition/pilot valve/intermittent pilot valve terminal is

energized.
j. Main valve terminal is energized.
k. Internal system fault.
l. Purge card is removed.
m. Purge card is defective.

4. PREIGNITION
a. Lockout Input opens during PREIGNITION.
b. Airflow Switch opens during PREIGNITION.
c. Preignition Interlock opens during PREIGNITION.
d. Flame signal detected during PREIGNITION.
e. Ignition terminal is not energized.
f. Pilot valve/intermittent pilot valve terminal is ener-

gized.
g. Main valve terminal is energized.
h. Internal system fault.
i. Purge card is removed.
j. Purge card is defective.

5. SAFETY 1 PERIOD
a. Lockout Input opens during SAFETY 1.
b. Airflow Switch opens during SAFETY 1.
c. Low Fire Switch opens (EC/RM7850A).
d. No flame is present at the end of SAFETY 1.
e. Ignition terminal is not energized.
f. Pilot valve/intermittent pilot valve terminal is not

energized.
g. Main valve terminal is energized.
h. Internal system fault.
i. Purge card is removed.
j. Purge card is defective.

6. PILOT STAB. PERIOD
a. Lockout Input opens during PILOT STAB.
b. Airflow Switch opens during PILOT STAB.
c. Low Fire Switch opens (EC/RM7850A).
d. No flame is present.
e. Ignition terminal is energized.
f. Pilot valve/intermittent pilot valve terminal is not

energized.
g. Main valve terminal is energized.
h. Internal system fault.
i. Purge card is removed.
j. Purge card is defective.

7. MAIN TRIAL PERIOD
a. Lockout Input opens during MAIN TRIAL.
b. irflow Switch opens during MAIN TRIAL.
c. Low Fire Switch opens (EC/RM7850A).
d. No flame is present.
e. Ignition terminal is energized.
f. Pilot valve/intermittent pilot valve terminal is not

energized.

g. Pilot valve is energized during MAIN TRIAL

stabilization.
h. Main valve terminal is not energized.
i. Internal system fault.
j. Purge card is removed.
k. Purge card is defective.

8. RUN Period.
a. No flame is present.
b. Lockout Input opens.
c. Ignition/interrupted pilot valve terminal is energized.
d. Main valve terminal is not energized.
e. Internal system fault.
f. Purge card is removed.
g. urge card is defective.
h. Airflow Switch Input opens.

9. POSTPURGE Period.
a. Ignition/pilot valve/intermittent pilot valve terminal is

energized.
b. Main valve terminal is energized.
c. Internal system fault.
d. Purge card is removed.
e. Purge card is defective.

OPERATION

Sequence of Operation

The relay modules have the operating sequences listed
below; see Fig. 3 and 4. The relay module LED provide
positive visual indication of the program sequence: POWER,
PILOT, FLAME, MAIN and ALARM.

Initiate

The relay module enters the INITIATE sequence when the
relay module is initially powered. The relay module can also
enter the INITIATE sequence if the relay module verifies
voltage fluctuations of +10/-15% or frequency fluctuations of
±10% during any part of the operating sequence. The
INITIATE sequence lasts for two seconds unless the voltage
or frequency tolerances are not met. When not met, a hold
condition is initiated and displayed on the optional KDM for at
least five seconds; when met, the INITIATE sequence
restarts. If the condition is not corrected and the hold condition
exists for four minutes, the relay module locks out. Causes for
hold conditions in the INITIATE sequence:

a. Ac line dropout detection.
b. Ac line noise that can prevent a sufficient reading of

the line voltage inputs.
c. Low line voltage brownouts.

The INITIATE sequence also delays the burner motor starter
from being energized and de-energized from an intermittent
AC line input or control input.

Standby

The relay module is ready to start an operating sequence
when the operating control input determines a call for heat is
present. The burner switch, limits, operating limit control and
all microcomputer-monitored circuits must be in the correct
state for the relay module to continue into the PURGE
sequence.

Normal Start-Up Purge

The relay module provides PURGE timing selectable from two
seconds to thirty minutes with power applied and the
operating control indicating a call for heat.

66-1092—06 14

EC7830A, RM7830A, EC7850A, RM7850A 7800 SERIES RELAY MODULES

1. The Preignition Interlocks, Limits and Burner Control,
Run/Test Switch, Airflow Switch Input, Lockout Input,
and all microcomputer-monitored circuits must also be
in the correct operating state.

2. The blower motor output, terminal 5, is powered to start
the PURGE sequence. The firing rate motor is driven to
the high fire position (EC/RM7850A). The PURGE
timing does not begin until the Airflow Switch Input and
High Fire Switch (EC/RM7850A) are both closed.

3. The Preignition Interlock Input must remain closed
throughout PURGE or a safety shutdown occurs.

4. The Airflow Switch Input must close by ten seconds into
PURGE or a safety shutdown occurs.

5. After the firing rate motor reaches the PURGE rate
position and PURGE timing is completed, the motor
drives to the low fire position (EC/RM7850A).

Ignition Trials

1. Preignition: With the firing rate motor at the low fire

position (EC/RM7850A), the ignition transformer,
terminal 10, is energized for three seconds.

2. First Safety Time (SAFETY1):
a. With the firing rate motor at the low fire position

(EC/RM7850A):
(1) The pilot valves and ignition transformer,

terminals 8, 10 and 21, are energized. Terminal
8 is an interrupted pilot valve and terminal 21 is
an intermittent pilot valve.

(2) During SAFETY1, the Low Fire Switch Input

must be closed. If it opens, a safety shutdown
occurs (EC/RM7850A).

(3) The Preignition Interlock Input is ignored during

SAFETY1, PILOT STAB., MAIN TRIAL, RUN
and POSTPURGE.

b. Flame must be proven by the end of the First Safety

Time to allow the sequence to continue. A safety
shutdown occurs if there is no flame.

3. Pilot stabilization (PILOT STAB.): With flame proven,
the ignition, terminal 10, is de-energized. The duration
of this state is five seconds.

4. Main Trial (MAIN TRIAL):
a. The MAIN TRIAL time is selectable as three or five

seconds. After PILOT STAB., and with the presence
of a flame, the main fuel valve, terminal 9, is pow­ered. If a flameout occurs, the relay module locks
out within one or two seconds, depending on the
amplifier Flame Failure Response Time (FFRT).
Thus, the second safety time is defined as MAIN
TRIAL time plus the amplifier FFRT.

b. During MAIN TRIAL, the Low Fire Switch Input must

be closed (EC/RM7850A). If it opens, a safety
shutdown occurs.

c. After three or five seconds of MAIN TRIAL, terminal

8 is de-energized for main stabilization. Flame must
remain proven during this five-second period.

Postpurge

The relay module (model specific) provides a two-, 15- or
30-second POSTPURGE following the completion of the RUN
period. The blower motor output is powered to drive all
combustion products and any unburned fuel from the
combustion chamber. It also supplies combustion air to burn
fuel being purged from the fuel line downstream from the fuel
shutoff valve.

1. The main fuel valve and the intermittent pilot valve,
terminals 9 and 21, are de-energized and the firing rate
motor is commanded to the low fire position
(EC/RM7850A) to begin the POSTPURGE period.

2. The Preignition Interlock Input is ignored during
POSTPURGE.

3. After the POSTPURGE period is completed, the relay
module re-enters STANDBY.

Run/Test Switch

The Run/Test Switch is located on the top side of the relay
module, see Fig. 5. The Run/Test Switch allows the burner
sequence to be altered as follows:

1. In Purge Drive to High Fire position, the Run/Test
Switch, when placed in the TEST position, holds in
PURGE with the firing rate motor in the High Fire
position (EC/RM7850A).

2. In the measured PURGE sequence, the Run/Test
Switch, placed in the TEST position, causes the
PURGE timing to stop. The firing rate motor is in the
High Fire position.

3. In Purge Drive to Low Fire position, the Run/Test
Switch, when placed in the TEST position, holds the
burner in PURGE with the firing rate motor in the Low
Fire position (EC/RM7850A).

4. During the PILOT STAB. period, the Run/Test Switch,
when placed in the TEST position, stops the timer,
allowing for pilot turn-down test and other burner
adjustments. This activates a 15-second flameout timer
that permits pilot flame adjustment without nuisance
safety shutdowns.

5. During Run, the Run/Test Switch, when placed in the
TEST position, drives the firing rate motor to the Low
Fire position.

IMPORTANT

When the relay module is switched to the TEST
mode, it stops and holds at the next Run/Test Switch
point in the operating sequence. Make sure that the
Run/Test Switch is in the RUN position before
leaving the installation.

SETTINGS AND ADJUSTMENTS

Run

1. The firing rate motor releases to modulation.

2. The relay module is now in RUN and remains in RUN

until the controller input, terminal 6, opens, indicating
that the demand is satisfied or a limit has opened.

Selectable Site-Configurable
Jumpers

The relay module has three site-configurable jumper options,
see Fig.5 or 6 and Table 7. If necessary, clip the site­configurable jumpers with side cutters and remove the
resistors from the relay module. The relay module reads the
settings of these configuration jumpers at startup. After 200
hours of main valve operation, the relay module locks the
jumper settings into internal memory. If these jumpers are

15 66-1092—06

EC7830A, RM7830A, EC7850A, RM7850A 7800 SERIES RELAY MODULES

HONEYWELL

DUST
COVER

PURGE
TIMER

WIRING
SUBBASE

CAPTIVE
MOUNTING
SCREW

RUN/TEST
SWITCH

CONFIGURATION
JUMPERS

RELAY
MODULE

SEQUENCE
STATUS
LED PANEL

RESET
BUTTON

FLAME
AMPLIFIER

BURNER CONTROL

M15187A

RUN/TEST SWITCH

SELECTABLE CONFIGURATION
JUMPERS

M7701B

changed after the 200 hours occur, the relay module locks out.
This safety function assures that the relay module cannot be
modified after it is installed in a particular location.

If JR3 (Airflow Switch) is intact (no Airflow Switch), then a
jumper must be installed between terminals 6 and 7. If JR3 is
clipped (Airflow Switch is present), the relay module locks out
if it detects a jumper between terminals 6 and 7.

SERVICE NOTE:Clipping and removing a site-configurable jumper enhances the level of safety.

Fig. 5. EC/RM7830A and EC/RM7850A Relay Modules exploded view.

Fig. 6. Selectable site-configurable jumpers.

Automation and Control Solutions

Honeywell International Inc.

1985 Douglas Drive North

Golden Valley, MN 55422

customer.honeywell.com

Table 7. Site-configurable jumper options.

Jumper

Number Description Intact Clipped

JR1 First Safety Time 5 seconds

JR2 Main Trial Time 5 seconds 3 seconds

JR3 Airflow Switch No Yes

a

EC7850A1148 or RM7850A1035
Intact—3 seconds Clipped—2 seconds

IMPORTANT

Clipping site-configurable jumpers after 200 hours of
operation results in a nonresettable Code 110,
LOCKOUT. The relay module must be replaced.

Flame Signal Measurement

Measure the flame signal at the appropriate times as defined
in the applicable flame amplifier specifications.

® U.S. Registered Trademark
© 2011 Honeywell International Inc.
66-1092—06 M.S. Rev. 07-11
Printed in U.S.A.

a

3 seconds

a