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TM077: 325 & 410 Series II Heat Pump Service Instructions
Rev 00: Issued April 2014
Component Tests 8 and 9
Test 8
Fit gauges to the discharge (high)
side access valve and observe the
discharge pressure.
Typical discharge pressure range is
600
– 2100kPa depending on the
storage tank water temperature.
A discharge pressure in excess of
2100kPa may indicate a low water
flow rate or an overcharge of
refrigerant.
Note: Refer to the Refrigerant Charge
section on page 54 for more
information on refrigerant charge and
refrigerant charge fault indications.
Test 9
Remove the insulation and hold the
TX valve bulb tightly by hand, to
increase the heat detected. The TX
valve should open with the following
results:
1. Suction
line
should
become
cooler.
2. Evaporator
(suction)
pressure
should increase.
Remove hand and replace the
insulation. The TX valve should now
close, resulting in the reversal of the
above results.
1800 kPa
