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!
Electrical shock may cause serious injury or
death. The following procedures may expose
you to dangerous line voltage so use caution
to avoid touching live electrical contacts. All
service must be performed by a trained, experi-
enced service technician.
!
Should overheating occur or the gas supply fail
to shut off, do not turn off or disconnect the
electrical supply to the pump. Instead, shut off
the gas at a location external to the appliance
Do not use the boiler if any part of the gas con-
trol system has been underwater. A qualified
service technician should inspect the boiler
and replace any part of the control system and
any gas control which has been underwater.
Use only your hand to turn the gas control
knob. Never use tools. If the knob will not turn
by hand, don't try to repair it. Force or attempt-
ed repair may result in a fire or explosion.
!
WHAt tO DO IF YOu sMeLL GAs
•
do not try to light any appliance.
•
do not use any electrical appliance.
•
do not touch any electrical switches; do not use
any phones in your building.
•
Immediately call your gas supplier from a neigh-
bor's phone. Follow the gas supplier's instruc-
tions. if you cannot reach your gas supplier, call
the fire department.
VIII - TROUBLESHOOTING
WARNING
WARNING
CAUTION
DIFFERENTIAL AIR PRESSURE
the differential air pressure switch is a safety device
which will prevent the boiler from firing if there is an air
intake, boiler heat exchanger or vent blockage.
To check the differential air pressure:
Turn off service switch or lower thermostat setting.
1.
Remove vinyl caps from tee.
2.
Install testing lines as shown to inclined manometer or
3.
differential pressure gauge with the ability to read 0.01"
increments to at least 6.0" w.c.
Turn on service switch and set thermostat to call for
4.
heat.
1500010 - SW PRESS NORM
OPEN SET PT .04"/0.14"
YELLOW LABEL
1552004 - TUBE, ORANGE,
3/16" X 5/16" OD SILICONE
AIR INLET
CONNECTION
1552004 - TUBE, ORANGE,
3/16" X 5/16" OD SILICONE
151009 - TEE PLASTIC
BARBED HOSE, 3/16" ID
5 REQ'D
Boiler Status
not running
running with
Blockage
Running w/out
Blockage (approx.)
If manometer readings do not correspond to the chart above, check
for possible causes:
• Blockage or moisture in suction lines to switch.
• Blockage in air intake or vent pipes.
• Undersized air intake or vent pipes.
• Loose blower wheel on motor shaft.
• Incorrect pressure switch or pressure switch setpoint
When pressure reading is proper and the pressure switch is
operating properly, remove testing lines and reinstall vinyl caps to
tee and 3-way connector.
14
1500011 - SW PRESS NORM
CLOSED SET PT 3.5"
WHITE LABEL
1552014 - TUBE
SILICONE, 3/16" ID
1230006 - CAP
BLK VINYL 3/16"
2 REQ'D
1110001 - CLAMP ROTOR
HC-5ST-R, 22 REQ'D
SIGHT GLASS
1552004 - TUBE, ORANGE,
3/16" X 5/16" OD SILICONE
GAS VALVE
PB-002.02 - ORIFICE PILOT
390686-1 HW-LP BBR10
1552004 - TUBE, ORANGE,
3/16" X 5/16" OD SILICONE
Diff. Pressure
Switch Contacts
3.5"
0"
0.14"
3.5"
greater than or
0.14"
equal to setpoints
Min. Fire: 0.3"
3.5"
Max. Fire: 2"
0.14"
Closed
open
open
Closed
Closed
Closed
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