Knight 100 Series, Руководство по обслуживанию

Страница: 41 / 52

3
Troubleshooting
(continued)
41
Table 3-3 Troubleshooting Chart - Noisy System
FAULT CAUSE CORRECTIVE ACTION
Noisy
Operation
- Supply gas problem. Natural gas
pressures should be between 4 inches
w.c. and 14 inches w.c. LP gas pressures
should be between 8 inches w.c. and 14
inches w.c.
• Refer to Section 7 - Gas Connections of the Fire Tube
Boiler Installation and Operation Manual for detailed
information concerning the gas supply.
- Gas/air mixture problem.
• Refer to the Gas Valve Adjustment Procedure of
this manual for the proper gas valve setting.
Verify that the vent/air intake lengths do not exceed the
maximum listed in the General Venting section of the
Knight Fire Tube Boiler Installation and Operation
Manual.
- Dirty/damaged burner.
• Refer to the burner removal and inspection procedure
section of this manual. Clean or replace the burner as
necessary.
- Low water flow through the heat exchanger.
• Refer to Section 6 - Hydronic Piping of the Knight
Fire Tube Boiler Installation and Operation Manual for
minimum flow rates. Verify that the boiler and system
pump are running on a call for heat.
- Air in the piping system. • Properly purge all air from the piping system.
- Low system water pressure. • Verify system pressure is a minimum of 12 psi.
No Pump
Operation -
Boiler Pump
System Pump
or
DHW Pump
- Blown fuse.
• Replace fuse F1 on the control board.
Note: Make sure pump amperage does not exceed
1.8 amps.
- Faulty pump. • Replace pump.
- Internal fault on control board. • Replace main control board.
No Blower
Operation
- Internal fault on control board. • Replace control board.
- Faulty blower. • Replace blower.
Relief Valve
Opening
- System pressure exceeds relief valve
setting.
• Lower the system pressure below the 30 psi rating of
the supplied relief valve or replace the standard relief
valve with a higher rated valve up to the maximum
pressure of the heat exchanger.
• Improperly sized expansion tank.
No Pump
Operation
- DHW
Recirculation
Pump
- Failed external relay.
- Line voltage shut off.
- Faulty pump.
- Faulty DHW recirculation sensor.
- Fault in connection board.
- Fault in control board.
• Check function of external relay.
• Check line voltage to external relay.
• Check recirculation pump.
• Check DHW recirculation sensor.
• Check low voltage connection board.
• Replace control board.
Service Manual