RM7895A,B,C,D/EC7895A,C; RM7896A,C,D 7800 SERIES RELAY MODULES
3
32-00156—01
Mounting Wiring Subbase
1.
Mount the subbase in any position except horizon-
tally 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 ser-
vicing, installation, access or removal of the relay
module, Expanded Annunciator, Keyboard Display
Module, flame amplifier, flame amplifier signal volt-
age probes, Run/Test Switch, electrical signal volt-
age 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.
Wiring Subbase
NOTE:
There are several different subbase models that
can be purchased. It is important to note which
subbase is compatible with the relay module
when purchasing repair or replacement parts.
Series 1000 Subbase
All relay product codes that start with a 1 (example:
RM7840G
1
014/U) can be used with existing subbase
Q7800A1005/U. These relays can also be used on the
Series 2000 subbase noted below.
Series 2000 Subbase
All relay product codes that start with a 2 (example:
RM7840G
2
014/U) can be used with subbase
Q7800A2005/U.
Subbase Compatibility
Any relay module in the 1000 series is fully backward
compatible with any subbase already installed in the field
(Q7800A1005/U, Q7800B1003/U, Q7800A2005/U,
Q7800B2003/U).
Any relay module in the new 2000 series will only be able
to be installed on subbase Q7800A2005/U, and will not be
backward compatible with any Q7800A1005/U legacy
subbases already installed in the field.
IMPORTANT
Make sure to check the relay model number and
check the subbase compatibly prior to ordering or
attempting a new installation or field upgrade.
If you attempt to place a 2000 series relay on a
non-compatible 1000 series subbase, you will
receive an error code of 101. This indicates that
you must a) change out the subbase to a
Q7800A2005/U or b) choose a compatible 1000
series relay module.
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.
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 2-line VFD KDM
(65-0090), the 4-line LCD KDM (32-00110), Net-
work Interface Unit (63-2278), Data ControlBus™
Module (65-0091) or Extension Cable Assembly (65-
0131).
3.
Disconnect the power supply from the main discon-
nect before beginning installation to prevent electri-
cal 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 Volt-
age) wiring.
5.
For recommended wire size and type, see Table 1.
6.
For recommended grounding practices, see Table 2.
