WT8840 TRADE WATER HEATER CONTROLS
34-00013EF—01
4
Fig. 4. Use a moderate amount of pipe compound.
Table 2. NPT pipe thread length (in.).
Fig. 5. Water heater controls and connections.
CAUTION
Contamination Hazard.
Can cause equipment malfunction.
Do not use thread tape sealants to seal the gas
supply to the control.
a. Use a pipe dope compound to seal the
connection.
b. Use only ANSI-approved compounds.
Wiring
Follow the wiring instructions furnished by the
appliance manufacturer, if available, or use the
general instructions provided below. When these
instructions differ from the appliance manufacturer,
follow the appliance manufacturer instructions. Make
sure wiring insulation does not get cut by sharp edges.
NOTE:
All wiring must comply with applicable
electrical codes and ordinances.
Connect control circuit to the water heater control
using the connections shown in Fig. 5.
Fill Tank
Refer to the appliance manufacturer’s instructions to
fill the tank with water.
Pilot Gas and Lighting Procedure
1.
Start by turning the device knob to Pilot, push
the knob down, and hold in position. (The pilot
valve opens and allows gas to flow into the pilot
burner.)
NOTE:
If the gas pipe is full of air (new
installation), it takes a long time to
purge the air through the pilot before
the pilot will light. Approximately
5 minutes of purge time is required for
every 10 feet of 1/2-in. pipe with 5 in.
w.c. pressure.
2.
Depress the piezo igniter to light the pilot flame
and hold the knob in until the status indicator
starts to blink (approximately 30 seconds),
indicating pilot now being held by electronics.
NOTE:
LED should blink once every three
seconds. If not, check the error codes in
Table 3.
3.
Release the knob and turn to the desired
temperature setting. The burner will come on if
water temperature is significantly below the
temperature setpoint and the LED will begin to
strobe every three seconds.
4.
Allow one minute for thermopile to cool before
re-lighting pilot.
Turn on Main Burner
Follow the instructions provided by the manufacturer
or turn up the temperature at the setpoint knob.
WARNING
Scalding Hazard.
Can cause burns, severe injury or death.
Never move the setpoint knob past the Hot
setting unless extremely hot water is desired.
Always check water temperature at the faucet
and readjust until comfortably warm to the
touch. Consider the ages and health of all who
will come in contact with heated water.
Pipe
Size
Thread Pipe
This Amount
Maximum Depth Pipe can
be inserted into Control
1/2
3/4
1/2
TWO
IMPERFECT
THREADS
IGNITION
SYSTEM
CONTROL
THREAD PIPE THE AMOUNT
SHOWN IN TABLE 2 FOR INSERTION
INTO IGNITION SYSTEM CONTROL
APPLY A MODERATE AMOUNT OF
PIPE COMPOUND ONLY TO PIPE
(LEAVE TWO END THREADS BARE).
M29771
PIPE
BOTTOM VIEW
M36124
PRESSURE
TAP
MAIN GAS
PILOT
GAS
THERMOPILE
GAS LINE
CONNECTION
PIEZO IGNITOR
SWITCH
FRONT VIEW
IGNITOR
LEAD
DEVICE
KNOB
STATUS
INDICATOR
COM
+
–
SERIAL
COMMUNICATIONS
