IMPORTANT
BEFORE SWITCHING “ON” THE POWER AT THE MAIN CIRCUIT BREAKER PANEL
MAKE SURE THAT THE HOT WATER CIRCUIT IS FREE OF AIR POCKETS OR ELSE
PREMATURE FAILURE OF THE ELEMENT WILL OCCUR. TO DO THIS OPEN ALL HOT
WATER OUTLETS ONE AT A TIME FOR A MINUTE OR TWO UNTIL THE WATER FLOW
IS CONTINUOUS AND FREE FROM “GULPING” AND FREE FROM VISIBLE AIR POCKETS.
1) Open fully both inlet and outlet valves at the heater.
2) Open fully the greatest hot water flowing outlet in the system. If the outlet is a “single lever”
mixer type turn to the hottest position. Run for one minute to clear all the air from the system.
3) Slowly close OUTLET ball valve until the water flow from the faucet just starts to reduce.
NOTE: This process has two effects. One, any air in the system will be purged out. Two, the
heater units will be pressurized at the supply pressure. This will prevent the elements burning
when energized.
(Note:
Keep water flowing
while carrying out the procedures outlined below.)
OPERATING UNIT AND SETTING WATER TEMPERATURE
IV COMMISSIONING YOUR HEATER
a) Flow enough hot water to activate unit. The indicator light on the black flow control board
should illuminate.
b) Further increase the hot water flow and the indicator light on the clear thermostatic board
to the left of the black board should illuminate. Note: This light should pulse On and Off at
first and after about 20- 30 seconds it should stay fully on.
c) Further increase the hot water flow and the indicator light on the next clear thermostatic
board (PS28T model only) should illuminate. Note: This light should pulse On and Off at
first and after about 20- 30 seconds it should stay fully on.
d) Set (PS19T) thermostat to achieve the desired outlet temperature.
Set both (PS28T) thermostats to the same position to achieve the desired outlet temp.
e) The thermostat is now set and the water temperature will always be the same when the
indicator light is pulsing.
f) Increasing water flow (above the flow rate at which the thermostatic control is no longer
effective) will reduce the water temperature.
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