Page 17 of 24
Heat Pump Water Heaters
MWP Series
Commissioning (continued)
General Checks
a. Check that the air ow over the coil is not restricted and that
the fan is running smoothly.
b. Check the unit is installed level and that condensate drains
freely by pouring some water into the base tray.
c. Check the operation of the thermostat or BMS.
(Satellite symbol on TZT-100 indicates communicating.)
d. Check connection pipes have been insulated.
e. Leave all relevant documentation with the unit.
f. Check for leaks at water connections.
De-Ice Cycle
Under normal operation in cold conditions the coil will at times
change to a white appearance as a frost forms. The unit is
programmed to de-ice no more frequently than once every 50
minutes. At the end of each de-ice cycle, the coil should be
completely clear of ice. Should a layer of clear ice form on the
coil, then contact your Installer or Temperzone Customer
Service (www.temperzone.biz).
Protection Against Freezing
If the outdoor ambient temperature falls close to freezing point
the external pump must continue to circulate water to prevent
freezing, whether heating is called for or not.
Maintenance
At Four Weeks
a. Check compressor compartment for oil stains indicating
refrigerant leaks.
b. Check tightness of electrical connections.
Yearly
a. Check tightness of all fan and motor mountings.
b. Check tightness of electrical connections.
c. Check that fan motors are free running.
d. Check condensate drains for free drainage.
e. Check for leaks at water connections.
Use a suitable liquid pipe sealant (eg Locktite 567) to prevent
any joint leaks
f. Check and remove as necessary any organic material and
dust accumulation from coil ns and inside the fan chamber
(power off). In corrosive environments, the checking and
cleaning frequency should be increased.
g. Touch up any unit paintwork damage to prevent corrosion.
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