RM7890A,B,C/EC7890A,B 7800 SERIES RELAY MODULES
66-1089—11
2
INSTALLATION
WARNING
Fire or Explosion Hazard.
Can cause property damage, serious injury, or
death.
To prevent possible hazardous burner operation, verify
safety requirements each time a control is installed on
a burner.
WARNING
Electrical Shock Hazard.
Can cause personal injury, death or equipment
damage.
Disconnect the power supply before beginning
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.
IMPORTANT
1. Wiring connections for the relay modules are unique;
refer to Fig. 2 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 RM/EC7890 must not
exceed those listed on the RM/EC7890 label or the
Specifications; see Tables 3, 4, and 5.
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 following exceptions:
•C7962 Visible Light Detector
•C7927 Ultraviolet Detector
•C7015/C7915 Infrared Detector
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.
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
See Fig. 1 for the internal block diagram of RM/EC7890 Relay
Module.
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
servicing, installation, access or removal of the
RM/EC7890, KDM, flame amplifier, flame amplifier
signal voltage probes, 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. Drill the pilot
holes.
4.
Securely mount the subbase using four no. 6 screws
(not provided).
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