Instructions / Assembly

331921-000 – 7 –
III) INITIAL START-UP
The burner is equipped with pre-purge and post-purge control.
The pre-purge is set for a timing of 15 seconds, +5 seconds,
-0 seconds. The post-purge is set for 3 minutes.
After the burner has started to fire, allow the heater to operate
for 10 to 15 minutes (from a cold start). Take a smoke reading.
An opening for smoke readings is provided in the transition
piece of the duct (Figure 6).
The smoke must be adjusted to a maximum of #1 smoke.
With an adjustment of #1 smoke, the overfire pressure should
be between 0.20 in. w.c. and 0.25 in. w.c. (0.049 to 0.062
kPa). Take care to replace the sealing screw in the overfire
pressure test port to prevent flue gas from escaping from the
combustion zone into the home (Figure 7).
SKIRT
OVERFIRE
PRESSURE
PORT
WATER HEATER
CASING
SEALING SCREW
Figure 7. Overfire Pressure Test Port
IV) TEST FOR LEAKS
With the heater still running, test around the band clamp at the
flue connection of the heater for leaks. Use a smoke pencil
or similar device. Make sure the clamp is tight and no flue
gases escape at this point.
Repeat the procedure at the connection between the flex
duct and the vent terminal (inside the house). If leakage is
detected, it may be due to misplaced clamps over the joint.
Please repair all leaks.
Note: The gasketing material is a special high temperature
Teflon. DO NOT SUBSTITUTE. If more gasketing is required
for repair it can be obtained where you purchased this heater.
IF YOU CAN SMELL FLUE GASES IN THE HOME, IT IS A
SIGN OF LEAKAGE SOMEWHERE IN THE FLUE SYSTEM.
CHECK FOR LEAKAGE AT ALL JOINTS OF THE FLEX
DUCT (AT THE HEATER CONNECTION AND THE VENT
TERMINAL). MAKE SURE THE SMOKE SAMPLING PORT
IS SEALED WITH THE COVER AND GASKET (see Figure 6).
V) ANNUAL INSPECTION
Once a year inspect all vent joints for leakage as described
in the section under “Initial Setup”. Inspect the outside vent
terminal and remove any debris which may have accumulated.
Perform a combustion test and overfire test as described in
the same section.
Repair all leaks as required and make the necessary burner
adjustments to obtain the prescribed smoke readings at the
maximum overfire pressure.
Replace leaking band clamps with new ones as required.
VI) REPLACEMENT PARTS
Part No. Description
63376 Termination Device
63377 Flex Duct and Transition 5 ft. long
63378 Flex Duct and Transition 10 ft. long
63379 Flex Duct and Transition 20 ft. long
63386 Termination Screen
63400 Clamp 3 in. complete with Gasket
63401 Clamp 6 in. complete with Gasket
Table 2.