Maintaining Your Heat Pump; Working On The Heat Pump; Normal Maintenance - IVT GreenlineC Manual To Installation, Commissioning And Maintenance

Maintaining your heat pump

Your heat pump normally requires little maintenance, but we recommend occasional checking to ensure
that your heating installation give the best possible performance. The description sometimes refers to a
heat pump component. You find these on the following pages.

Working on the heat pump

•
Switch off the electrical supply before commencing work on the heat pump. Usually there is an
isolating switch on the wall before the heat pump.
•
Only an accredited refrigeration company is permitted to work on the refrigerant circuit. The installa-
tion contains gases that may form toxic fumes when combined with discharges and naked flames. The
gas that forms may cause choking even at low concentrations. If it should leak, evacuate the room
until it has been thoroughly aired.

Normal maintenance

Points to check a few times a year:
•
Sight glass (pos 6). When the heat pump starts, and during rapid temperature changes, you can
sometimes see bubbles in the liquid in the refrigerant circuit for a minute or so. This is normal.
If there are always bubbles in the sight glass: Contact the installer.
Sight glass
•
Expansion vessel. A plastic expansion vessel is connected to the heat pump heat transfer fluid
circuit. The level of the vessel must not fall below1/3 (the vessel is mounted outside the heat pump).
Too low fluid level: With the pump working, remove the lid to the valve at the top of the vessel and open
the valve. Fill with antifreeze or clean water (simplest with a watering can). Shut the valve again and
screw on the lid.
Ball valve with lid
•
Particle filter (pos 1, only built-in in the E series on the hot side). The particle filter, which is con-
nected on both the hot and cold sides of the heat pump protect the heat exchangers from dirt. Some-
times these filters may get clogged and cause malfunctions.
Do this when checking: Shut down the heat pump with the on/off button on the control panel. Close the
valve and unscrew the sealing cover. Check for dirt in the filter. If necessary, remove the circlip that
retains the filter. The simplest way to do this is by using pliers. Remove the filter and flush it clean with
water. Refit the filter, circlip and cover. Open the valve and start the heat pump. Note that the particle
filter in the E series is mounted inside the heat pump. On the cold side and in the C and D series the
filters are outside the heat pump.
Particle filter
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