Service Manual

3Troubleshooting (continued)

Table 3E Troubleshooting Chart - Noisy System

FAULT

CAUSE

 

CORRECTIVE ACTION

 

 

 

 

 

 

- Supply gas problem. Natural gas pressures

• Refer to Section 7 - Gas Connections of the Knight

 

should be between 4 inches w.c. (1.0 kPa)

XL Installation and Operation Manual for detailed

 

and 14 inches w.c. (3.5 kPa). LP gas

information concerning the gas supply.

 

 

 

pressures should be between 8 inches w.c.

 

 

 

 

 

 

 

(2.0 kPa) and 14 inches w.c. (3.2 kPa).

 

 

 

 

 

 

 

 

 

 

 

- Gas/air mixture problem.

• Refer to the Gas Valve Adjustment Procedure

on

 

 

page 41 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 XL Installation and Operation Manual.

 

 

 

 

 

Noisy

- Dirty/damaged burner.

• Refer to page 26 in this manual for the burner removal

 

and inspection procedure. Clean or replace the burner

Operation

 

 

as necessary.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Low water flow through the heat exchanger.

• Refer

to

Section

6 - Hydronic Piping

of

the

 

 

Knight XL Installation and Operation Manual for

 

 

minimum flow rates. Verify that the boiler is piped in a

 

 

primary/secondary fashion and 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

 

 

(82.7 kPa).

 

 

 

 

 

 

 

No Pump

- Blown fuse.

• Replace fuse F5 on the control board, see page 28 of

this manual.

 

 

 

 

 

 

 

Operation -

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Boiler Pump

- Faulty pump.

• Replace pump.

 

 

 

System Pump

 

 

 

 

 

 

 

or

- Internal fault on control board.

 

 

 

 

 

 

DHW Pump

• Replace main control board.

 

 

 

 

 

 

 

 

 

 

 

- Faulty pump relay.

• Replace relay.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- System pressure exceeds relief valve

• Lower

the

system

pressure below the

50

psi

Relief Valve

setting.

(344.7 kPa) rating of the supplied relief valve or replace

 

the standard relief valve with a higher rated valve up to

Opening

 

the maximum pressure of the heat exchanger.

 

 

 

 

• Improperly sized expansion tank.

 

 

 

 

 

 

 

 

 

 

31

Page 31
Image 31
Lochinvar 399 - 800 service manual Noisy, No Pump, Operation Boiler Pump, System Pump, DHW Pump, Relief Valve, Opening

399 - 800 specifications

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