Lochinvar ARMOR 151 - 801 Service Manual page 27

Table 3E
- Supply gas problem. Natural gas pressures
should be between 4 inches w.c. and
14 inches w.c.
be
14 inches w.c.
- Gas/air mixture problem.
- Dirty/damaged burner.
- Low water flow through the heat exchanger.
- Air in the piping system.
- Low system water pressure.
- Blown fuse.
- Faulty pump.
- Faulty pump relay.
- Internal fault on control board.
- System pressure exceeds relief valve
setting.
LP gas pressures should
between 8 inches
• Refer to Section 7 - Gas Connections of the Armor
Water Heater Installation and Operation Manual for
w.c. and detailed information concerning the gas supply.
• Refer to the Gas Valve Adjustment Procedure on
pages 37-38 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 Armor Water Heater Installation and
Operation Manual.
• Refer to page 22 in this manual for the burner removal
and inspection procedure. Clean or replace the burner
as necessary.
• Refer to Section 6 - System Piping of the Armor Water
Heater Installation and Operation Manual for minimum
flow rates.
• Properly purge all air from the piping system.
• Verify system pressure is a minimum of 12 PSI.
• Replace fuse F1 on the control board, see page 24 of
this manual.
• Replace pump.
• Replace pump relay.
• Replace main control board.
• Lower the system pressure below the 150 PSI rating of
the supplied relief valve.
Service Manual
27