Re-Verber-Ray MP3 Series Insert Manual page 15

MP3 Series
Bypassing any switch is intended for testing purposes only. Do not leave switch bypassed during
NOTICE
normal operation or the heater's built-in safety mechanisms will be compromised.
Key
Start Process
Question
Question
Is there 24 VAC
at the coil of the
enable relay?
No
Thermostat or its wiring
is faulty or internal
transformer is bad.
Re-connect igniter to
harness and check voltage
at igniter during ignition
sequence. Is it approx. 120
VAC?
No
Yes
Replace
ignition
module.
Check connector pins
and wires. Repair or
replace.
Are the manifold
and inlet pressures
within required
limits?
No
Adjust pressures within
required limits. If inlet is over
14" W.C., release pressure at
inlet to heater to unlock valve.
Corrective
Action
Remove
obstruction.
Is there 24 VAC
Yes from the enable
relay N.O. contact?
No
Enable relay is
faulty.
Is the inlet or outlet of the
heater obstructed, or is
the vent exceeding the
recommended vent lengths?
Yes
Remove obstruction and/or
configure proper vent length.
Reconnect tubing,
free kinks, and remove
obstructions.
Remove
obstruction.
Yes
Is the gas
Yes
orifice
obstructed?
No
Replace gas
valve.
Fan is faulty.
No
Is the fan obstructed
or locked in place by
Yes
a foreign object?
Is there at least 1
VDC across "T1" and
Yes
"RTN" of modulating
controller?
No
Thermostat or its
wiring is faulty.
Correct faulty wiring or replace
damaged wires.
No
pressure switch connected and free of
The heater is equipped with safety
switch, and are located in the service
compartment. TEMPORARILY place
jumper wires across the terminals of
the switch(es). Does the igniter warm
15
4.0 Troubleshooting Guide
Modulating controller
is faulty.
No
Is 48–120 VAC
measured between
Yes
"N" and "F" of the
modulating controller?
Yes
Is there 120 VAC
across "N" and "L"
Yes
of the modulating
controller?
No
Find source of
electrical problem
and repair.
Is the wiring of the
pressure switches
No
loose, damaged, or
disconnected?
No
Yes
Is the pneumatic tubing to the
kinks, damage, or obstruction?
Yes
pressure switches. They are a
normally open and a normally
closed, pneumatically operated
up and glow orange/red?
No Yes
Continued on Page 17