Installation Guide

28
TEMPERATURE-PRESSURE RELIEF VALVE OPERATION
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Manually operate the temperature and pressure relief valve at least
once a year to make sure it is working properly. To prevent water
damage, the valve must be properly connected to a discharge line
that passes through the structural fl oor and terminates external to
the building. In cold climates, it is recommended that the discharge
line be terminated at an adequate drain inside the building. See
Figure 1. 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. See Figure 35. If the valve fails to completely
reset and continues to release water, immediately close the manual
gas shut-off valve and the cold water inlet valve and call a qualifi ed
technician. Do not plug the temperature-pressure relief valve or
discharge line.
TEMPERATURE AND PRESSURE
RELIEF VALVE
DISCHARGE LINE TO DRAIN
MANUAL RELIEF
VALVE
FIGURE 35.
Draining and Flushing
It is recommended that the tank be drained and flushed
every 6 months to remove sediment which 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 gas to the water heater at the manual gas shut-off
valve.
2. Open a nearby hot water faucet until the water is no longer hot.
3. Close the cold water inlet valve.
4. Connect a hose to the drain valve and terminate it to an adequate
drain or external to the building.
5. Open the water heater drain valve and allow all of the water to
drain from the tank. Flush the tank with water as needed to remove
sediment.
6. Close the drain valve, refi ll the tank, and restart the heater as
directed in this manual. 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 refi lling the tank and
should not be confused with a tank leak.
REMOVING THE MANIFOLD/BURNER ASSEMBLY
1. Turn the gas control/temperature knob to the “OFF” position
(Figure 35).
2. Before performing any maintenance, it is important to turn off
the gas supply to the water heater at the manual gas shut-off
valve. This valve is typically located beside the water heater.
Note the position of the shut-off valve in the open/on position,
then proceed to turn it off (Figure 27).
3. With the unit shut-off, allow sufficient time for the water heater to
cool before performing any maintenance.
THERMOCOUPLE
MANIFOLD TUBE
PILOT
TUBE
WITH
FERRULE
NUT
GAS CONTROL VALVE / THERMOSTAT
FIGURE 36.
4. Remove the outer door.
5. Disconnect the following from the gas control valve/thermostat:
pilot tube (7/16” SAE wrench), igniter wire (from the igniter lead
wire), and manifold tube (3/4” SAE wrench). See Figure 36.
6. Disconnect the white and red wires from the gas control valve/
thermostat (Figure 39). Use needle nose pliers to grip the
connector(s). IMPORTANT: Grip the connector carefully to
prevent damage. Do not grip or pull the wires themselves.
7. Grasp the manifold tube and push down slightly to free the
manifold tube and pilot tube.
8. Remove the screws (1/4” SAE nut driver) securing the manifold/
burner assembly to the combustion chamber. See Figure 37.
9. Carefully remove the manifold/burner assembly from the
combustion chamber. BE SURE NOT TO DAMAGE ANY
INTERNAL PARTS.
MANIFOLD
SCREWS (2)
TWO PIECE
WIRE CONNECTOR
MANIFOLD
DOOR
THERMAL
SWITCH
PILOT
TUBE
PIEZO
IGNITER
BUTTON
GAS CONTROL VALVE/
THERMOSTAT
MANIFOLD
TUBE
THERMOCOUPLE
VIEW PORT
FIGURE 37.