John Wood Electric Water Heaters - Manual (Page 6)

Normal Operation: When hot water is being used, cold
water enters the bottom of the heater (either bottom feed or
by diptube), and the bottom element will begin to heat the
cold water. If lots of hot water has been used, the upper
thermostat will take priority and the top portion of the heater
will be heated. Once heated, the thermostat will flip down to
the lower thermostat to heat the lower portion.
Filling the Tank
NOTE: When filling, avoid water spillage. Do not allow the
insulation of the heater to get wet as water can cause elec-
trical malfunction.
1. Close the drain valve, and then open a hot water faucet.
2. Open the cold water supply valve.
3. When water runs out of the hot faucet, the tank is full.
4. Check the system for leaks.
Draining the Tank (completely)
If the power is to be turned off during the cold season and
the tank is exposed to freezing temperatures, the water
heater must be drained. Water will expand when it freezes
and can damage the heater.
Completely drain as follows:
1. Make sure the electrical supply to the water heater is
"OFF".
2. Turn off cold water supply.
3. Connect a garden hose to the end of the drain valve and
direct this to a point lower than the heater.
4. Open a hot water faucet.
5. Open the drain valve on the heater - drain, keeping the
drain valve open during the shutdown period.
6. To refill the heater, see “Filling the Tank” section.
Installation Check List
Temperature Adjustment
Thermostats are factory set at 140°F (60°C) (Canada),
120°F (49°C) (U.S.A.). The thermostats operate automati-
cally. They can be adjusted to provide warmer or cooler
water temperature. Set both thermostats to the SAME set-
ting (if applicable).
If water temperature adjustment is required:
1. Turn the electrical supply to the water heater "OFF".
2. Remove the access door(s) and insulation pad(s).
3. Check with a voltage tester at terminal 1 and 3 of the limit
control that power is indeed "OFF".
4. Adjust the thermostat(s) to the water temperature
desired (if a two-thermostat system exists, set both ther-
mostats at the same temperature).
5. Ensure insulation pad is in the door cavity. Replace
access door(s).
6. Turn the electrical supply to the water heater "ON".
Temperature Limit Control
For safety, a non-adjustable high limit temperature switch
will shut off the power when excessive water temperatures
are reached. This switch must be re-set manually. See
“Trouble-Shooting” section.
Temperature & Pressure Relief Valve
Manually operate the temperature and pressure relief valve
at least once a year to make sure it is working properly and
that there are no blockages. 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 (see Figure 3) to allow the valve to operate freely
and return to its closed position. If the valve fails to com-
pletely reset and continues to release water, immediately
turn "OFF" the electrical supply to the tank, and close the
cold water supply valve and call a qualified service techni-
– 6 –
IV) OPERATION
V) MAINTENANCE
WARNING:
Risk of scalding
There is a hot water scald potential if the
thermostat is set too high.
Adjusting the thermostat past the 49°C
(120°F) bar on the temperature dial will
increase the risk of scald injury. Hot water
can cause severe burns in:
1 1/2 seconds at . . . . . . . . 66°C (150°F)
3 seconds at . . . . . . . . . . . 60°C (140°F)
20 seconds at . . . . . . . . . . 54°C (130°F)
Check Here
1. Are the fuse and wire sizes correct?
2. Is the certified relief valve installed?
3. Are you sure that in case of water leakage, the
building, furniture, carpeting or other property
will not be damaged?
4. Has the relief valve been piped to a suitable
drain point?
5. Is the relief valve discharge unobstructed?
6. Is the heater completely filled with water?
7. Is the cold supply valve open?
If the answers to the above are “Yes”, turn on the
power and enjoy all the hot water you need, all
the time.
WARNING
Do not supply power to this water heater
until you have verified that the unit is com-
pletely filled with water.
To ensure that the water heater is full of
water and that all the air has been purged
from the system, run all the hot water
faucets in the house continuously for three
(3) minutes.