Weil-McLain SERIES 7 PFG - Manual (Page 11)

11
PFG S
erieS
7 G
aS
-
Fired
W
ater
B
oiler
– U
niverSal
C
ontrol
S
yStemS
Part Number 550-110-643/0605
VERIFY PROPER OPERATION AFTER SERVICING
Never jumper (bypass) any device except
for momentary testing as outlined in
Troubleshooting Charts. Substantial
property damage and/or severe personal
injury could occur.
Label all wires prior to disconnection
when servicing controls. Wiring errors
can cause improper and dangerous
operation.
1. Before troubleshooting.
a. Have a voltmeter that can check 120VAC, 24VAC, a
microammeter with minimum scale range of 0-25, and a
continuity tester.
b. Check for 120VAC (min. 102 - max. 132) to boiler.
c. Check for 24VAC at secondary side of transformer.
d. Make sure thermostat is calling for heat and contacts
(including appropriate zone controls) are closed. Check for
24VAC between thermostat wire nuts and ground.
IN EVENT OF ACTUATOR FAILURE
–EFFIKAL DAMPER
If troubleshooting chart recommends replacing actuator, and
actuator is not immediately available, damper blade can be
fixed in an open position to allow boiler operation.
Manually turning blade can cause actuator damage. Follow these
instructions only in case of no heat or damper actuator malfunc-
tion. See Figure 6.
1. Move damper service switch to “HOLD DAMPER OPEN”
position. Apply “call for heat” to boiler. Damper blade should
then rotate to open position and boiler will fire.
2. If Step 1 above does not open damper, manually rotate
damper blade to open position using wrench or pliers on flat
shaft between damper and actuator. Boiler will fire. Verify
that damper service switch is in “HOLD DAMPER OPEN”
position.
3. Do not leave damper permanently in this position. Replace
actuator immediately. If damper is left in open position, boiler
will not operate at published efficiencies.
See damper manufacturer’s instructions packed with
damper for additional information.
JOHNSON DAMPER
If troubleshooting chart recommends replacing actuator, and
actuator is not immediately available, damper blade can be fixed
in open position to allow boiler operation. Follow these instruc
-
tions only in case of no heat or damper actuator malfunction.
See Figure 7.
1) Turn off power to boiler.
Failure to turn off power to boiler can result
in severe personal injury, death or substantial
property damage.
2) Remove damper actuator cover.
3) On PC board, move wire from A to B.
4) Turn on power to boiler.
5) Using wrench or pliers on flat shaft section, manually rotate
damper blade until green light turns on. Boiler will fire.
6) Do not leave damper permanently in this position. Replace
actuator immediately. If damper is left in open position, boiler
will not operate at published efficiencies.
See damper manufacturer’s instructions packed with
damper for additional information.
Figure 7
Figure 6
Section D: Troubleshooting