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Combustion Tests
Burner adjustments:
Final burner adjustments must be made using combustion
test equipment to assure proper operation.
1. Fill heater with water. Do not fire heater without water or
sections will overheat.
2. Refer to burner manual for start-up.
3. Allow heater to heat to design condition.
4. Using combustion test equipment, adjust burner for:
a. a trace of smoke between #0 smoke and #1 smoke.
b. over-fire draft in combustion chamber per Table 4.
Note:
For JW6 F307V also see additional “Installation
Instructions for Through-the-wall Venting Components" that
is supplied with the JW6 F307V.
Model #
Over-fire draft
in. w.c. (Pa)
307, 507
+0.06 to +0.12
657
-0.01 to -0.03
307V
+0.2 to +0.3
317, 517, 717
-0.01 to -0.03
Table 4. Over-fire Draft Pressures
Routine Preventative Maintenance (By Owner/
Operator)
As a precaution against fire, and to maintain an adequate flow
of combustion air to the heater:
•
Keep the appliance area clear and free from combustible
material, gasoline and other flammable vapors and liquids.
•
Keep the air ventilation openings unobstructed. If dust and
lint is seen accumulating around the openings, remove it.
•
Do not pile cartons, papers, or combustible materials on
top, or near the heater (see Figure 1).
Draining And Flushing
•
Burn hazard.
•
Hot water discharge.
•
Keep hands clear of drain
valve discharge.
BURN
HOT
HOT
DANGER
It is recommended that the tank be drained and flushed
every 6 months to remove sediment that may build up during
operation. The water heater should be drained if being shut
down during freezing temperatures. To drain the tank, perform
the following steps:
1. Turn "OFF" the electrical supply to the water heater.
2. Turn "OFF" the oil supply to the water heater.
3. Close the cold water inlet valve.
4. Open a nearby hot water faucet.
5. Connect a hose to the drain valve and terminate it to an
adequate drain.
Caution!
The water being drained can be extremely hot! The
drain hose should be rated for at least 200°F . If the drain hose
does not have this rating, open the cold water supply valve
until the water flow is no longer hot. Close the cold water
supply valve and resume.
6. Open the water heater drain valve and allow all the water
to drain from the tank.
7. Flush the tank with water as needed to remove sediment.
8. Close the drain valve. Follow the instructions in the "Filling
The Water Heater" section to refill the tank.
9. Turn on the oil supply to the water heater.
10. Turn "ON" the electrical supply to the water heater.
If the water heater is going to be shut down for an extended
period, the drain valve should be left open.
Important:
Condensation may occur when refilling the tank
and should not be confused with a tank leak.
Temperature And Pressure Relief Valve
Manually operate the temperature and pressure relief valve
at least once a year to make sure it is working properly (see
Figure 15). To prevent water damage, the valve must be
properly connected to a discharge line that terminates at
an adequate drain. Standing clear of the outlet (discharged
water may be hot), slowly lift and release the lever handle
on the temperature and pressure relief valve to allow the
valve to operate freely and return to its closed position. If
the valve fails to completely reset and continues to release
water, immediately shut off the power to the heater and the
cold water inlet valve and call a qualified service technician.
•
Burn hazard.
•
Hot water discharge.
•
Keep clear of
temperature-pressure
relief valve discharge.
BURN
HOT
HOT
DANGER
TEMPERATURE-PRESSURE
RELIEF VALVE
DISCHARGE PIPE
Figure 15. T&P Valve Test
