Greenheck 7800 Series Relay Modules - Manual (Page 2)

2
RM7895A,B,C,D/EC7895A,C; RM7896A,B,C,D 7800 SERIES RELAY MODULES
66-1090—2
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 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-
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 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).
Wiring Subbase
CAUTION
Electrical Shock Hazard.
Can cause personal injury or damage equipment.
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. 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.