Mounting Wiring Subbase; Wiring Subbase - Honeywell 7800 Series Installation Instructions Manual

Relay modules
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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:
RM7840G1014/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:
RM7840G2014/U) can be used with subbase
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,
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 Q7800A1005/U legacy subbases already installed in
the field.
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.
Electrical Shock Hazard.
Can cause personal injury or equipment damage.
Disconnect the power supply before beginning
1. For proper subbase wiring and sequence chart, refer
to Fig. 2.
2. For proper remote wiring of the KDM, refer to the
Specifications for the 2-line VDF KDM (65-0090),
the 4-line LCD KDM (32-00110) Data ControlBus
Module™ (65-0091) or Extension Cable Assembly
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. Use recommended wire routing of leadwires:
a. Do not run high voltage ignition transformer
wires in the same conduit with the flame
detector, Data ControlBus Module™, or Remote
Reset Module wiring.
b. Do not route flame detector, KDM, Data
ControlBus Module™, or Remote Reset Module
leadwires in conduit with line voltage circuits.
c. Enclose flame detector leadwires without armor
cable in metal cable or conduit.
d. Follow directions in flame detector, KDM, Data
ControlBus Module™, or Remote Reset Module
6. For KDM (KDM), because the KDM is powered from a
low voltage, energy limited source, it can be
mounted outside of a control panel if it is protected
from mechanical damage.
NOTE: Use 13 Vdc power supply any time more than one
KDM is used.
7. Use maximum wire lengths:
a. RM/EC7890 leadwires: The maximum leadwire
length is 300 feet (91 meters) to terminal inputs
(Control, Running/Lockout Interlock).
b. Flame Detector leadwires: The maximum flame
sensor leadwire length is limited by the flame
signal strength.
c. Remote Reset leadwires: The maximum length of
wire is 1000 feet (305 meters) to a Remote Reset
d. Data ControlBus Module™: The maximum Data
ControlBus Module™ cable length depends on
the number of system modules connected, the
noise conditions and the cable used. The
maximum length of all Data ControlBus
Module™ interconnecting wire is 4000 feet (1219
8. For recommended wire size and type, see Table 1.


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