dle valve to the test point B bleedle valve and
open the upstream manual gas valve. Make sure
that test point A & B bleedle valves have been
opened so as to allow gas to flow. This will bring
gas pressure to the second valve seat.
5.
Open the bleedle valve at test point C and connect
a second rubber tube to it. Connect the other end
of the tube to a manometer and look for a build-up
of pressure. Increasing pressure indicates a leak-
ing gas valve which must be replaced.
6.
Remove rubber tube and manometers. Close
each test point bleedle valve as the tubes are
removed.
7.
After no leakage has been verified at all valve
seats and test valves, open downstream leak test
valve and restore electrical power to the heater.
Post Start-Up Check
Check off steps as completed:
1.
Verify that the heater and heat distribution units or
storage tank are filled with water.
2.
Confirm that the automatic air vent (if used) was
opened two full turns during the venting proce-
dure.
3.
Verify that air has been purged from the system.
4.
Verify that air has been purged from the gas pip-
ing, and that the piping has been checked for
leaks.
5.
Confirm that the proper start-up procedures were
followed.
6.
Inspect burner to verify flame.
7.
Test safety controls: If heater is equipped with a
low water cut-off or additional safety controls, test
for operation as outlined by manufacturer. Burner
should be operating and should go off when con-
trols are tested. When safety devices are restored,
burners should re-ignite after pre-purge time
delay.
8.
Test limit control: While burner is operating, move
indicator on high limit control below actual water
temperature. Burner should go off while blower
and circulator continue to operate. Raise setting
on limit control above water temperature and
burner should re-ignite after pre-purge time delay.
NOTE: Ignition control may have to be reset
after this portion of the test.
9.
Test ignition system safety device:
a.
Open manual gas valve. Turn power on.
b.
Set thermostat to call for heat.
c.
When the heater is in operation, pull cap off of
tee in air switch hose. The burner should go
off almost immediately.
d.
Reattach cap on tee. Burner should re-ignite
after pre-purge time delay.
NOTE: Ignition
control may have to be reset after this por-
tion of the test.
10. To restart system, follow lighting instructions in the
Operation section.
NOTE:
Reinstall HGPS as applicable.
Fig. 49: Leak Test Procedure
GAS
TO BURNER
A
B
C
D
California Hot Water Supply, Inc.
(800) 249-7244
46
