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LIMIT SWITCH
WIRES
DRAFT HOOD
AIR PRESSURE
TUBING
MOTOR VEN-
TILATION
OPENINGS
BLOWER
MOTOR
AIR INTAKE
OPENING FOR
DRAFT HOOD
LIMIT SWITCH
Figure 12
Flushing of Tank
Once per month, drain approximately a full pail of
water from the drain valve (Item 25 in Figure 1).
CAUTION:
The out–flowing water is hot. Avoid splashing the
water on yourself or on the surroundings where it
may cause damage.
1. Close the valve in the cold water line to the heater.
2. Open an upstairs hot water tap.
3. Place a pail under the water heater drain valve and
open slowly.
4. Drain approximately one pail full. Check for any
sediment that may have been flushed out.
If the water is discoloured, or if particles like coarse
sand are flushed out, this may be an indication that fur-
ther service is required. It is normal that small quanti-
ties of particles are flushed out. However, if large quan-
tities are flushed out, sometimes to the extent that the
water flow almost stops, call a water specialist for rec-
ommendation. The anode may have to be replaced or
a water softener may be required to remove calcium
from the water supply.
5. After flushing, close the water heater drain valve.
Ensure that the drain valve does not drip.
6. Open the cold water supply valve to the heater.
7. Check the hot water faucet which was open at the
beginning. When a steady stream of water flows
out with no air escaping, close faucet.
CAUTION:
Do not dislodge the small tubing at the fan housing
pressure tap or any wiring that goes to the limit
switches on the fan housing!
Venting System Inspection
Inspect the venting system over the entire length of the
system, beginning at the heater.
1. Check the rubber coupling which attaches the vent
pipe to the blower. Are the screw clamps tight?
Does the rubber coupling show signs of deteriora-
tion?
2. Feel along the length of the vent pipe to ensure
that all joints to fittings and couplings are secure.
3. Inspect all hangers. Are the fasteners firm? Has
any foam rubber or vibration isolation material
become loose?
WARNING
Do not allow any material to be placed on top of
or suspended from the vent pipes. Do not use
vent pipes to dry towels, clothes, or use the
vent pipes as anchors for clotheslines or other
similar objects.
4. Inspect seals / caulking where the vent piping pen-
etrates an exterior wall.
5. Inspect the outside vent elbow or the vent riser (if
installed). Remove any obstructions.
6. Have any partitions, false ceilings or other struc-
tural changes been made which may have an
impact on the functioning of the vent system?
7. Inspect the ventilation openings of the blower fan.
Remove any lint that may impair air circulation at
the motor.
8. Inspect the ventilation openings that provide com-
bustion / ventilation / dilution air to the heater.
(See Section II VENTING )
If any deficiencies are encountered contact a qualified
service contractor.
Burner Inspection
There are two kinds of burners:
1. A sheet metal burner is used on most natural gas
models. See Figure 13.
2. A cast iron burner is used on all propane gas mod-
els and some natural gas models. See Figure 15.
Sheet Metal Burner
The steel burner for Natural Gas has no external air
adjustment. It is fully self– compensating and no out-
side adjustment is required. Observe the flame pattern.
Ensure that no debris has fallen on top of the burner
and no foreign objects have been introduced into the
combustion chamber. Ensure that the combustion air
openings to the heater are not obstructed and the inner
and outer door to the combustion chamber are in
place.