47
COMMISSIONING
TO FILL AND TURN ON THE WATER HEATER
The power supply to the water heater must not be switched on until the water heater is filled with water
and a satisfactory megger reading is obtained.
•
Open all of the hot water taps in the house (don’t forget the shower).
•
Open the cold water isolation valve fully to the water heater.
Air will be forced out of the taps and the air bleed valve.
•
Close each tap as water flows freely from it.
•
Check the pipe work for leaks.
•
Inspect for leaks at the temperature pressure relief valve connection to the water heater.
If a leak is detected, close the cold water isolation valve fully and relieve pressure from the water heater
by either operating the easing lever on the temperature pressure relief valve or opening a hot tap. Remove
the valve and all of its thread sealant from the threads of the valve. Reapply new thread sealant and refit
the valve.
Refer to the procedure in
“Temperature Pressure Relief Valve”
on page 43.
•
Operate the easing lever on the temperature pressure relief valve to check the smooth operation of the
valve plunger and that water discharges freely from the drain line. It is very important the lever is raised
and lowered gently. The lever should move smoothly and without undue force.
If the lever cannot be moved or is jerky in its movement, then the valve has been damaged and must be
replaced.
•
Switch on the electrical supply at the water heater isolating switch on the switchboard and at the isolating
switch at the water heater. The Display icons and Selection Keys will illuminate blue and red on the Display
Panel.
“Display When Electricity Supply is Turned On at the Isolating Switch”
on page 15.
Note:
When the electrical supply is switched on, there will be a knocking sound from the heat pump for a
short period of time. This is the electronic expansion valve operating. This is normal and not a fault with
the heat pump.
•
Turn the
heat pump “On” at the Display Panel.
“Turning the Heat Pump “On” or “Off” at the Display
on page 19.
•
Set the Clock on the Water Heater.
on page 18.
•
Set the timer period(s) if required.
on page 21.
The heat pump may take up to 5 minutes to commence operating when the power supply is switched on. The
heat pump will only operate when the water in the storage tank requires heating and power is available at the
water heater.
If the ambient air temperature is below -5°C or above 43°C and the system calls for heating, the heat pump
will not operate and the electric heating unit will operate instead.
When the heat pump is operating, the system may switch to the electric heating unit if it detects that the
ambient air temperature is below the minimum operating temperature of -5°C or above the maximum operating
temperature of 43°C. It may also switch back to heat pump operation from the electric heating unit if it detects
the ambient air temperature has moved back to within the heat pump’s operating temperature range.
