Lochinvar 000 - 500 User Manual

8.

For L.P. gas, consult your L.P. gas supplier for
expert installation.

1.

Turn the power “OFF” at the main dis 

con 

nect

switch.

2.

Turn gas valve control knob to “PILOT” po si tion
on standing pilot models.  Ensure that the stand ing
pilot remains on.  If the pilot goes out, follow the
“Lighting Instructions” for standing pi lot models
to light the pilot.  Turn gas valve control knob to
“OFF” po si tion on spark ignition models. 

3.

Remove the 1/8" hex plug located on the out let
side of the gas valve and install a fitting suitable to
connect to a manometer or magnahelic gauge.  See
Figure 18.  Minimum range of scale should be up
to 5" w.c. for Natural gas mod els and 10" w.c. for
L.P. gas models.

4.

The 500,000 Btu/hr model will have two gas
valves with a pressure regulator on each valve.
Repeat the following adjustment pro ce dure to set
the manifold pressure on each gas valve.

5.

Remove pressure regulator adjustment cap screw
on the gas valve.  See Figure 18 for location.

6.

Turn the power “ON” at the main dis 

con 

nect

switch.

7.

Turn gas valve control knob to “ON” po si tion.

8.

Set the thermostat(s) to call for heat.

9.  Observe gas regulator pressure when all burn ers

are firing.  See Table D, Manifold Pressure for
proper regulator pressure settings.

10. If adjustment is necessary, turn regulator

ad just ment screw clockwise to raise regulator gas 
pres sure, counterclockwise to lower gas pres sure,
to proper setting.  Note: Adjustment fitting is
plas 

tic and may require slightly greater turning

force than a metal fitting.

11. Turn the power “OFF” at the main dis 

con 

nect

switch.

12. Turn gas valve control knob to “PILOT” po si tion

on standing pilot models.  Turn gas valve control
knob to “OFF” position on spark ignition models. 

13. Remove fitting from the gas valve and re place the

1/8" hex plug that was previously removed and
tighten.

Upon completion of any piping con nec tions to the
gas system, leak test all gas con nec tions with a soap
solution while system is un 

der pressure.

Immediately repair any leaks found in the gas train
or related components.

op er ate  an

appliance with a leak in the gas train, valves or
related piping.

4

3

2

1

0

1

2

3

4

Manometer

Gas Valve

3.5"

Pressure Regulator Adjustment
(under cap screw)