John Wood Commercial Electric Water Heater - Manual (Page 18)

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General
CAUTION! NEVER APPLY ELECTRICAL POWER TO
THIS WATER HEATER UNLESS IT IS COMPLETELY
FULL OF WATER. TO PREVENT DAMAGE TO THE TANK
AND HEATING ELEMENTS, THE TANK MUST BE FILLED
WITH WATER BEFORE USE. WATER MUST FLOW
FROM THE HOT WATER FAUCET BEFORE APPLYING
POWER.
Filling the Water Heater
1. Do not turn the power on until all the following steps,
including Startup steps, have been completed.
2. Make sure the drain valve is closed.
3. Open a hot water faucet associated with the system.
4. Open the cold water supply valve.
NOTE: When filling, avoid water leakage. Do not allow the
insulation of the water heater to get wet as water can cause
electrical malfunction.
5. When water runs out of the hot water faucet in a steady
stream, the tank is full.
6. Close the hot water faucet and check the system for
leaks. Repair as required and retest.
7. Connect a hose to the drain valve and route to a suitable
drain. Open the drain valve and let water run to flush out
any foreign matter that may have entered the system.
Once flushed, close the drain valve and disconnect
hose. Repeat steps 4-6.
Startup
Perform the following checks when the heater is placed into
operation for the first time.
Voltage Check: Verify that the supply voltage and the rating
plate voltage are the same.
1. Open the upper component panel cover and check all
electrical connections.
2. Remove the lower cover and the insulation for the ele-
ment compartment and check all electrical connections.
3. Turn "ON" the electrical supply to the heater.
4. Carefully watch all the components for one complete
cycle of operation to see that they function properly.
DANGER: Hazardous voltages are present in both com-
partments. Be careful not to touch any electrical connec-
tions.
5. To check the operation of the thermostat
(a) operate the thermostat manually and
(b) let the heater come to the preset temperature and
shut off automatically.
6. Turn "OFF" the electrical supply to the heater.
7. Replace all the insulation and close all covers.
8. Turn "ON" the electrical supply to the heater.
High Temperature Limiting Device
The heater is equipped with a high temperature cutoff
switch. If the water temperature exceeds the preset limit this
device turns off the power to the heating elements. The high
temperature switch is set to activate at 88°C (190°F). If the
switch has been activated, allow the water temperature to
drop by 17°C (30°F) (min) and reset manually. The high-
temperature switch is not adjustable.
VI) OPERATION