Troubleshooting Chart ESIE10-01
3–78 Part 3 – Troubleshooting
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Low discharge
pressure
1 There is wind effect at low
ambient.
1 Protect the unit against
excessive wind into the vertical
coils.
2 The condenser fan control is not
correct.
2 Check if the unit set-up in the
microprocessor matches the unit
model number.
3 There is low suction pressure. 3 See the corrective steps for low
suction pressure.
4 The compressor is operating
unloaded.
4 See the corrective steps for
failure to load.
Low suction
pressure
1 The refrigerant charge quantity is
inadequate.
1 Check the liquid line sight-glass.
Check the unit for leaks.
2 The evaporator is dirty. 2 Clean chemically.
3 The liquid line filter-drier is
clogged.
3 Replace.
4 The expansion valve is
malfunctioning.
4 Check the expansion valve
superheat and valve opening
positions. Replace only the valve
that is not working.
5 The water flow to the evaporator
is insufficient.
5 Check the water pressure drop
across the evaporator and adjust
the flow.
6 The water temperature leaving
the evaporator is too low.
6 Adjust the water temperature to a
higher value.
7 There is an evaporator head ring
gasket slippage.
7 If the suction pressure and the
superheat are both low, it may
indicate an internal problem.
High suction
pressure
1 There is excessive load - high
water temperature.
1 Reduce the load or add
additional equipment.
2 The compressor unloaders are
open.
2 See corrective steps below for
failure of compressor to load.
3 The superheat is too low. 3 Check the superheat on the
microprocessor display. Check
the suction line sensor
installation and sensor.
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