State GPH-90N - Manual (Page 45)

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SNOW ACCUMULATION
Keep the area around fl ue terminal free of snow and ice.
The appliance will not function properly if the intake air
or exhaust is impeded (blocked or partially blocked) by
obstructions.
CLEANING THE INLET WATER FILTER
The cold water inlet fi lter must be cleaned on a regular
basis. The frequency of this cleaning is dependent on the
quality of your local water supply. You will need to prepare
a bucket to collect some of the draining water. The cold
water inlet fi lter is located inside the door on the left-hand
side of the heat engine. To clean the inlet fi lter:
Access To
Door Pins
Door
Lock
FIGURE 38
Remove the fi lter:
• Disconnect the electrical power to the water heater.
• Close the shutoff valves on both the hot-water and
cold-water lines.
• Unlock the door by rotating the side lock counter-
clockwise with a wide, slot screwdriver.
• Pop the top and bottom door pins by pushing the pins
out, using a small screwdriver. Open the door.
• Open a nearby hot water faucet to depressurize the
water tank.
• Drain the tank following the instructions in the “Draining
The Tank” section.
• Unscrew the fi lter and clean by rinsing it under a faucet
and scrubbing with a brush if required.
Heat
Engine
Cabinet
Water Inlet
Fitting
Water
Inlet Filter
FIGURE 39
Install the fi lter:
• Install the clean fi lter.
• Close the drain valve.
• Open the shutoff valves on both the hot-water and
cold-water lines.
• Fill the tank following the instructions in the
“Filling The Water Heater” section in this Manual.
• Close and lock the door.
• Reconnect the electrical power to the water heater.
• Restart the water heater following the “Lighting
Instructions”.
CLEANING THE HEAT ENGINE
It is imperative that the control compartment burner and
circulating air passageways of the appliance is kept
clean.
• Turn off and disconnect the electrical power. Allow to
cool.
• Remove and clean the water inlet fi lter. See “Cleaning
The Inlet Water Filter” section.
• Remove the front panel.
• Use a low air pressure to remove dust from the main
burner, heat exchanger, and blower. Do not use a wet
cloth or spray cleaners on the burners.
NOTE: Do not use volatile substances such as benzene
and thinners. They may ignite or fade the paint.
FLUSHING THE HEAT EXCHANGER (LIME BUILD-
UP)
The heat exchanger must be cleaned on a regular basis
to reduce lime build-up. The frequency of this cleaning
is dependent on the quality of your local water supply.
Failure to fl ush the appliance will cause damage to the
heat exchanger. Damage caused by lime build-up is not
covered by the unit’s warranty.
• Disconnect electrical power to the water heater.
• Close the shutoff valves on both the hot water and cold
water lines.
• Drain the tank using the instructions in the “Draining
The Tank” section.