Grieve Corporation RM7897A1002 Installation Manual

RM7897A1002, RM7897C1000
7800 SERIES
Relay Modules

INSTALLATION INSTRUCTIONS

APPLICATION

The RM7897A,C are microprocessor-based integrated burner
controls for automatically fired gas, oil, or combination fuel
single burner applications. The RM7897A,C system consist of
a relay module, subbase, amplifier, and purge card. Options
include keyboard display module (KDM), Personal Computer
Interface, Data ControlBus™ Module, remote display
mounting, Expanded Annunciator and Combustion System
Manager® Software.

Functions provided by the RM7897A,C include automatic
burner sequencing, flame supervision, system status
indication, system or self-diagnostics and troubleshooting.

The RM7897 adds a proof of closure input to the standard
primary control function of the RM7895/RM7896 product. It
adds a blinking fault code function to the POWER LED on
Alarm shutdown. It also adds programmable postpurge using
the S7800A1142 Keyboard Display Module (KDM). The
RM7897A1002 offers selectable pilot operation, intermittent
on terminal 8 or interrupted on terminal 21.

The RM7897C1000 offers interrupted pilot and delayed main
valve for 2-step firing (Low-High-Low) applications.

This document provides installation and static checkout
instructions. Other applicable publications are:

Publication

No. Product

63-2278 Q7700 Network Interface Unit Product Data

65-0084 Q7800A,B 22-Terminal Wiring Subbase

Product Data

65-0288 S7800A1142 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 Installation

Instructions

65-0101 S7830 Expanded Annunciator Product Data

Publication

No. Product

65-0102 ZM7850A Combustion System Manager™

Operating Instructions

65-0109 R7824, R7847, R7848, R7849, R7851,

R7861, R7886 Flame Amplifiers for the
7800 Series Product Data

65-0131 221818A Extension Cable Assembly

Product Data

65-0229 7800 SERIES Relay Modules Checkout and

Troubleshooting Product Data.

65-0092 QS7800A ControlBus™ Module, Standard

65-0227 QS7800B ControlBus™ Module, Multidrop

SPECIFICATIONS

Electrical Ratings (See Table 3):

Voltage and Frequency:
RM7897A,C: 120 Vac (+10/-15%), 50/60 Hz (± 10%).
Power Dissipation: 10W maximum.
Maximum Total Connected Load: 2000 VA.
Fusing Total Connected Load: 15A 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.

Approvals:

Underwriters Laboratories Inc. Listed: File No. MP268,

Guide No. MCCZ.
Canadian Standards Association Certified: Pending.
Factory Mutual Approved: Report No. Pending.
IRI Acceptable.
Federal Communications Commission: Part 15, Class B,

Emissions.

66-1151

RM7897A1002, RM7897C1000 7800 SERIES RELAY MODULES

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.

WARNING

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

Follow applicable safety requirements when installing
a control on a burner to prevent death or severe injury.

WARNING

Electrical Shock Hazard.
Can cause serious injury, death or equipment
damage.

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

IMPORTANT

1. Wiring connections for the relay modules are unique;

refer to Fig. 2 and 3 or the appropriate Specifications
for proper 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 RM7897A,C must not

exceed those listed on the RM7897A,C 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 Flame Detectors C7015,
C7927,C7961 and C7952.

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 may 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.

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.

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
RM7897A,C expanded annunciator, keyboard display
module, 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).

66-1151 2

RM7897A1002, RM7897C1000 7800 SERIES RELAY MODULES

Wiring Subbase

WARNING

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

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

The internal block diagram of the RM7897A,C is shown in Fig.

1.

PROVIDE DISCONNECT MEANS AND

1

OVERLOAD PROTECTION AS REQUIRED.

2

RM7897A-INTERMITTENT PILOT.
RM7897C-INTERRUPTED PILOT.

3

RM7897A-INTERRUPTED PILOT.
RM7897C-DELAYED MAIN VALVE.

INDICATES FEEDBACK SENSING
TO RELAY STATUS FEEDBACK
AND LINE VOLT INPUTS

FIELD WIRING

INTERNAL WIRING

OPTIONAL KEYBOARD
DISPLAY MODULE

DDL

DDL
COMMUNICATIONS

M22727A

1

RS485

2

3

REMOTE
RESET

5

RUN/TEST
SWITCH

RESET
PUSHBUTTON

STATUS LEDs

LIMITS

PREIGNITION
INTERLOCK

CONFIGURATION
JUMPERS

CONTROLLER

6K1

3K1

SAFETY RELAY
CIRCUIT

6

20

1. For proper subbase wiring and sequence chart, refer to
Fig. 2 and 3.

2. For remote wiring of the Keyboard Display Module, refer
to the Specifications for the Keyboard Display Module
(65-0288), Network Interface Unit (63-2278), Data
ControlBus™ Module (65-0091) 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. For recommended grounding practices, see Table 2.

120 VAC,
50/60 HZ

L1
(HOT)

1

MICROCOMPUTER

RELAY
DRIVE
CIRCUIT

1K

LOCKOUT
INTERLOCK
(INCLUDING
AIRFLOW SWITCH)

L2

FLAME SIGNAL

2K

3K
4K

5K
6K

7K

POWER SUPPLY

1K1 2K1 5K1

7

2K2

7K16

PLUG-IN PURGE
TIMER CARD

PLUG-IN

TEST

FLAME
AMPLIFIER

RELAY
STATUS
FEEDBACK
AND LINE
VOLTAGE
INPUTS

CONTROL
POWER

10

4K1

8

9

21

4

3

TEST
JACK

F

G

22

IGNITION

PILOT

MAIN VALVE

BLOWER

ALARM

L2

2

3

Fig. 1. Internal block diagram of RM7897A,C (see Fig. 2 and 3 for detailed wiring instructions).

7. 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

ControlBus™ Module, or Remote Reset Module
Instructions.

8. The KDM is powered from a low voltage, energy limited
source. It can be mounted outside of a control panel if it
is protected from mechanical damage.

NOTE: A 13 Vdc power supply must be used any time more

than one KDM is used.

3 66-1151

RM7897A1002, RM7897C1000 7800 SERIES RELAY MODULES

Q7800

LINE VOLTAGE ALARM

BURNER MOTOR
(BLOWER)

BURNER
CONTROLLER/LIMITS

RUNNING INTERLOCK
(INCLUDING
AIRFLOW SWITCH)

INTERMITTENT
PILOT/IGNITION

MAIN FUEL VALVE(S)

IGNITION

FLAME DETECTOR

3

G

L2

3

4

5

6

7

8

9

10

F

(L1)

12

13

14

15

16

17

18

19

20

21

22

FOR DIRECT SPARK IGNITION
(OIL OR GAS)

IGNITION

10

TRANSFORMER

8

MAIN VALVE

2

PREIGNITION
INTERLOCK

MASTER
SWITCH

L1
(HOT)

L2

L2

10-SECOND
INTERRUPTED
PILOT

1

INITIATE
(INITIAL
POWERUP
ONLY)

POWER

LED
DISPLAY

BURNER

OPERATING
CONTROLS
AND
INTERLOCKS

PREIGNITION INTERLOCK CLOSED

FLAME
SIGNAL

1

120 VAC, 50/60 HZ POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.

DO NOT CONNECT ANY WIRES TO UNUSED TERMINALS.

2

STANDBY

LIMITS AND BURNER CONTROLLER CLOSED

SAFE START CHECK FLAME PROVING

00

POWER

5
TIMED
PREPURGE

POWER

PILOT

FLAME

MAIN

BURNER/BLOWER MOTOR

10

RUNNING INTERLOCKS CLOSED

PFEP
10 SEC.

00

(4 SEC. IF
JR1

INTERRUPTED PILOT

10

CLIPPED

POWER

PILOT

FLAME

MAIN

IGN.

20TO5

3

4

5

RUN

POWER

PILOT

FLAME

MAIN

ALARM

9

00

4

POSTPURGE

POWER

STANDBY

POWER

PII

SSC

M22728B

20

MFEP

POWER

PILOT

FLAME

MAIN

ALARMALARMALARM

5

8INTERMITTENT PILOT

8

21

21

MAIN VALVE

TO

6

L1

6

7TO

SEE FLAME DETECTOR SPECIFICATIONS FOR CORRECT WIRING.

PROGRAMMED ON SETUP USING S7800A1142 DISPLAY.

PURGE TIME DEPENDS ON WHICH ST7800 IS INSTALLED.

Fig. 2. Wiring subbase and sequence chart for RM7897A.

66-1151 4

LINE VOLTAGE
ALARM

BURNER MOTOR
(BLOWER)

BURNER
CONTROLLER/LIMITS

RUNNING INTERLOCK
(INCLUDING
AIRFLOW SWITCH).

10 SEC. INTERRUPTED
PILOT/IGNITION

MAIN FUEL VALVE(S)

IGNITION

FLAME DETECTOR

4

RM7897A1002, RM7897C1000 7800 SERIES RELAY MODULES

Q7800

G

L2

3

4

5

6

7

8

9

10

F

(L1)

12

13

14

15

16

17

18

19

20

21

22

FOR DIRECT SPARK IGNITION
(OIL OR GAS)

IGNITION

10

TRANSFORMER

8

9

MAIN VALVE

2

DELAYED
(2ND STAGE)
MAIN VALVE

MASTER
SWITCH

L1
(HOT)

L2

PREIGNITION
INTERLOCK

1

L2

INITIATE
(INITIAL
POWERUP
ONLY)

POWER

LED
DISPLAY

BURNER

OPERATING
CONTROLS
AND
INTERLOCKS

FLAME
SIGNAL

1

120 VAC, 50/60 HZ POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.

DO NOT CONNECT ANY WIRES TO UNUSED TERMINALS.

2

LIMITS AND BURNER CONTROLLER CLOSED

PREIGNITION INTERLOCK CLOSED

00 00 10

TIMED

STANDBY

POWER

PREPURGE

SAFE START CHECK

PFEP
10 SEC.

5

(4 SEC. IF

CLIPPED

JR1

POWER

PILOT

FLAME

MAIN

POWER

PILOT

FLAME

MAIN

BURNER/BLOWER MOTOR

10

IGNITION

INTERRUPT/PILOT

RUNNING INTERLOCK

3

4

5

RUN

POWER

PILOT

FLAME

MAIN

ALARM

6

9

00

21

3

POSTPURGE

POWER

STANDBY

POWER

PII

SSC

M22729A

20

MFEP

POWER

PILOT

FLAME

MAIN

ALARMALARMALARM

5

8

MAIN VALVE

DELAYED MAIN VALVE

TO

L1

6 7

TO

20TO5

FLAME PROVING

PROGRAMMABLE POST PURGE TIMING USING S7800A1142 KDM.

SEE FLAME DETECTOR SPECIFICATIONS FOR CORRECT WIRING.

PURGE TIME DEPENDS ON WHICH ST7800 IS INSTALLED.

Fig. 3. Wiring subbase and sequence chart for RM7897C.

5 66-1151