Grieve Corporation EC7895C Installation Manual

RM7895A,B,C,D/EC7895A,C;
RM7896A,B,C,D
7800 SERIES Relay Modules

INSTALLATION INSTRUCTIONS

APPLICATION

The RM7895A,B,C,D/EC7895A,C; RM7896A,B,C,D are
microprocessor-based integrated burner controls for
automatically fired gas, oil, or combination fuel single burner
applications. They are intended to replace the R4795 and
R7795 Primary Controls. The RM7895A,B,C,D/EC7895A;
RM7896A,B,C,D systems 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 RM7895A,B,C,D/EC7895A,C;
RM7896A,B,C,D include automatic burner sequencing,
flame supervision, system status indication, system or
self-diagnostics and troubleshooting. The RM7896 provides
a postpurge function.

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

65-0090 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

65-0101 S7830 Expanded Annunciator Product Data

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

Publication

No. Product

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:
RM7895/RM7896: 120 Vac (+10/-15%), 50/60 Hz (± 10%).
EC7895A,C: 220/240 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:

RM7895/RM7896:

Underwriters Laboratories Inc. Listed: File No. MP268,

Guide No. MCCZ.
Canadian Standards Association Certified: LR9S329-3.
Factory Mutual Approved: Report No. J.I.1V9A0.AF.
IRI Acceptable.
Federal Communications Commission: Part 15, Class B,

Emissions.

EC7895A,C:

Factory Mutual Approved.

66-1090-06

RM7895A,B,C,D/EC7895A,C; RM7896A,B,C,D 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 property damage, severe injury, or death.

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.

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, ordi-

nances and regulations.

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

4. Loads connected to the RM7895A,B,C,D/EC7895A,C;

RM7896A,B,C,D must not exceed those listed on the
RM7895A,B,C,D/EC7895A,C; RM7896A,B,C,D 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-rec-

ognized 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 Infrared Flame Detectors (C7015).

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 RM7895A,B,C,D/
EC7895A,C; RM7896A,B,C,D, 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).

66-1090—06 2

RM7895A,B,C,D/EC7895A,C; RM7896A,B,C,D 7800 SERIES RELAY MODULES

Wiring Subbase

WARNING

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

Disconnect the power supply before beginning
installation.

The internal block diagram of the RM7895A,B,C,D/
EC7895A,C;RM7896A,B,C,D is shown in Fig. 1.

1

PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.

2

LOCKOUT IF JUMPER JR2 REMOVED.

INDICATES FEEDBACK SENSING
TO RELAY STATUS FEEDBACK
AND LINE VOLT INPUTS

FIELD WIRING

INTERNAL WIRING

OPTIONAL KEYBOARD
DISPLAY MODULE

DDL

DDL
COMMUNICATIONS

M23996

1

RS485

2

3

REMOTE
RESET

5

RUN/TEST
SWITCH

RESET
PUSHBUTTON

STATUS LEDs

LIMITS

CONFIGURATION
JUMPERS

SAFETY RELAY
CIRCUIT

CONTROLLER

6K1

3K1

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
(65-0090), 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.

1

MICROCOMPUTER

RELAY
DRIVE
CIRCUIT

6

INTERLOCK
(INCLUDING
AIRFLOW SWITCH)

2

L1
(HOT)

1K

L2

RM7895, RM7896: 120 VAC, 50/60 HZ.
EC7895A,C: 220-240 VAC, 50/60 HZ.

PLUG-IN PURGE
TIMER CARD

FLAME SIGNAL

PLUG-IN

TEST

FLAME
AMPLIFIER

2K

3K
4K

5K
6K

7K

POWER SUPPLY

1K1 2K1 5K1

7

4K1

2K2

RELAY
STATUS
FEEDBACK
AND LINE
VOLTAGE
INPUTS

CONTROL
POWER

10

8

9

4

3

TEST
JACK

F

G

22

IGNITION

PILOT

MAIN VALVE

BLOWER

ALARM

L2

Fig. 1. Internal block diagram of RM7895A,B,C,D/EC7895A,C; RM7896A,B,C,D

(see Fig. 2 and 3 for detailed wiring instructions).

3 66-1090—06

RM7895A,B,C,D/EC7895A,C; RM7896A,B,C,D 7800 SERIES RELAY MODULES

Q7800

FOR DIRECT SPARK IGNITION

12

(OIL OR GAS)

13

14

15

16

17

18

19

20

21

22

10

8

2

MASTER
SWITCH

IGNITION
TRANSFORMER

MAIN VALVE

LINE VOLTAGE ALARM

BURNER MOTOR
(BLOWER)

BURNER
CONTROLLER/LIMITS

LOCKOUT INTERLOCK
(INCLUDING
AIRFLOW SWITCH)

INTERMITTENT
PILOT/IGNITION

MAIN FUEL VALVE(S)

IGNITION

FLAME DETECTOR

4

G

L2

3

4

(L1)

5

6

7

8

9

10

F

3

L1
(HOT)

L2

L2

1

LED
DISPLAY

BURNER
START

OPERATING
CONTROLS
AND
INTERLOCKS

FLAME
SIGNAL

1

RM7895, RM7896: 120 VAC , 50/60 HZ; EC7895: 220-240 VAC,
50/60 HZ POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.

DO NOT CONNECT ANY WIRES TO UNUSED TERMINALS.

2

3

FOR EC7895, A 220 TO 240 VAC TO 120 VAC, 10 VA MINIMUM STEPDOWN
TRANSFORMER (NOT PROVIDED) MUST BE USED TO DRIVE THE SHUTTER.

INITIATE

AIRFLOW SW CHECK

6

00 00 00

STANDBY

POWERPOWER

START

POWER

LIMITS AND BURNER CONTROLLER CLOSED

SAFE START CHECK

TIMED
PURGE

BURNER/BLOWER MOTOR

LOCKOUT INTERLOCK CLOSED

Fig. 2. Wiring subbase and sequence chart for RM7895A,B/EC7895A; RM7896A,B.

PFEP

4 OR 10 SEC

POWER

PILOT

FLAME

MAIN

ALARM ALARM

POWER POWER

PILOT

FLAME

MAIN

IGN

10

IGN/ PILOT

SEE FLAME DETECTOR SPECIFICATIONS FOR CORRECT WIRING.

4

FOR RM7895A1048 (ONLY), IGNITION TERMINAL 10

5

IS DE-ENERGIZED WHEN FLAME IS PROVEN.

6

AIRFLOW SWITCH CHECK FEATURE IS FOR THE RM7895B,RM7896B.

RM7896A,B ONLY.

7

RUN

5

MAIN VALVE

6

FLAME
PROVING

POWER

PILOT

FLAME

MAIN

ALARM

4

8

L1

TO

POST PURGE

9

TO

6

7

15 SEC

7

7

STANDBY

POWER

AFSC

SSC

M23997

66-1090—06 4