Honeywell 7800 Series Installation Instructions Manual page 3

Relay Module and Subbase
Compatiblity
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 new, repair or replacement
parts.
Series 1000 Relay Modules
All relay product codes that start with a 1 (example:
RM7840G1014/U) can be used with existing subbase
Q7800A1003/U and Q7800A1005/U.
Series 2000 Relay Modules
All relay product codes that start with a 2 (example:
RM7840G2014/U) must be used with subbase
Q7800A2003/U and Q7800A2005/U.
Subbase Compatibility
Any Relay Module in the 1000 Series with a Software
Revision level number starting with a "5" or greater will be
compatible with all subbase models both installed and
newly purchased. This includes (Q7800A1005/U,
Q7800B1003/U), and the 2000 Series subbases
(Q7800A2005/U, Q7800B2003/U).
See Fig. 1 for Software Revision Level number location on
the label (located on the rear of the relay module).
Any relay module in the new 2000 series will only be able
to be installed on subbase Q7800A2005/U,
Q7800B2003/U and will not be backward compatible with
any Q7800A1003/U and Q7800A1005/U subbases
already installed in the field.
Fig. 1. Software Revision Location
IMPORTANT
Make sure to check the relay model number and
the software revision level on the relay.
• 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 Q7800A2003/U or
Q7800A2005/U
or
b) choose a compatible 1000 series relay module
7800 SERIES RM7896D RELAY MODULE
Mounting Wiring Subbase
NOTE: For installation dimensions, see Fig. 2 or 3.
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 and removal of the
RM7896D, dust cover, 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. Drill
the pilot holes.
4. Securely mount the subbase using four no. 6 screws.
BURNER CONTROL
POWER
PILOT
PURGE
MAIN
ALARM
RESET
5 (127)
REMOVE ONLY FOR TERMINAL TEST ACCESS.
1
Fig. 2. Mounting dimensions of RM7896D Relay Module
and Q7800A Subbase in in. (mm).
NOTES: You might receive and error code 101 (via KDM) if
one of the following conditions exist:
a. The screws securing the relay to the subbase
are not tight enough, re-tighten to insure there
is no gap between the relay and the subbase.
b. If you attempt to place a 2000 series relay on a
non-compatible 1000 series subbase, This
indicates that you must:
— Change out the subbase to a
Q7800A2003/U or Q7800A2005/U
— Choose a compatible 1000 series relay mod-
ule
3
5
(127)
5-1/4 (133)
M10448
32-00208-01
1