Page 27 of 38
Pre-Start Checks
󠇠 Heat pump unit is installed on level concrete with rubber
mounting blocks with adequate air flow around the unit
󠇠 Condensate drain located on the rear of the heat pump
unit can run to waste freely
󠇠 There are no flammable or dangerous materials
anywhere near or within the surrounds of the heat pump
unit
󠇠 Electrical main supply cabling is sized correctly
󠇠 Electrical main circuit breaker protection is correct rating
to suit the heat pump unit specifications
󠇠 Electrical supply, voltage and earthing checked prior to
start-up of heat pump unit, check electrical wires for
correct tension
Buffer tank temperature probe installed in buffer tank
sensor well with heat transfer paste
Buffer tank temperature probe to hydronic supply/flow
water line if buffer tank is not used
󠇠 Hot water tank temperature probe installed in hot water
storage tank sensor well with heat transfer paste if
applicable
󠇠 External thermostat/control wiring installed correctly
(No voltage to be applied to digital input terminals on
heat pump units)
󠇠 Water shut off valves installed on unit
󠇠 Pressure limiting cold water inlet valves installed with
correct back flow prevention
󠇠 Propylene glycol added to lower freezing point of
hydronic circulation water in low ambient conditions and
cooling applications
For cooling applications -10 glycol freezing level is
recommended
󠇠 Spring check valves installed in hydronic and hot water
flow lines on all reverse cycle combination heat pump
unit/systems
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