RM7897A1002, RM7897C1000 7800 SERIES RELAY MODULES
When Installing this Product...
1. Read these instructions carefully. Failure to follow them
could damage the product or cause a hazardous
2. Check the ratings given in the instructions and marked
on the product to make sure the product is suitable for
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
Follow applicable safety requirements when installing
a control on a burner to prevent death or severe injury.
Electrical Shock Hazard.
Can cause serious injury, death or equipment
Disconnect power supply before beginning installation.
More than one disconnect may be required.
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)
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
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.
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.
Do not install the relay module where it can be subjected to
vibration in excess of 0.5G continuous maximum vibration.
The relay module is not designed to be weather tight. When
installed outdoors, protect the relay module in an approved
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
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
4. Securely mount the subbase using four no. 6 screws