Mounting Other System Components (Fig. 3) - Honeywell 7800 SERIES Installation Instructions Manual

Test
No. Test Jumpers
7 May need to
jumper limits
and/or Running
Interlocks
FINAL ALL
Mounting RM7838A Relay Module
1. Mount the RM7838A on the 7800 Subbase vertically,
or mount horizontally with the knife blade terminals
pointing down. When mounted on the Q7800A, the
RM7838A must be in an electrical enclosure.
2. When mounted in an electrical enclosure, provide
adequate clearance for servicing, installation and
removal of the RM7838A, keyboard display module,
flame amplifier, signal probes, electrical signal
voltage probes and electrical connections.
a. Allow an additional two inches (51 mm) below
the RM7838A for the flame amplifier mounting.
b. Allow an optional three-inch (76 mm) minimum
to both sides of the RM7838A for electrical
signal voltage probes.
3. Make sure no subbase wiring is projecting beyond the
terminal blocks. Tuck in wiring against the back of the
subbase so it does not interfere with the knife blade
terminals or bifurcated contacts.
Table 7. Static Checkout (continued).
Voltmeter Normal Operation
19-L2 Manually drive damper motor
open and look for High Fire
Switch closure.
CAUTION
Equipment Damage Hazard.
Can cause equipment damage.
After completing these tests, open the master switch and remove all test jumpers from
the subbase terminals. Also remove bypass jumpers from limits if used.
RM7838A 7800 SERIES RELAY MODULES
If Operation is Abnormal,
Check the Items Listed Below
1. High Fire Switch.
2. Firing rate motor and transformer.
3. Burner control.
4. Limits.
5. Running Interlocks.
IMPORTANT
The RM7838A must be installed with a plug-in
motion rather than a hinge action.
4. Mount the RM7838A by aligning the four L-shaped
corner guides and knife blade terminals with the
bifurcated contacts on the wiring subbase and securely
tightening the two screws without deforming the plastic.

Mounting Other System Components (Fig. 3)

Refer to the applicable specifications for mounting other
system components.
7
66-1087—2