Carrier 50EQ - Manual (Page 13)

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10 20 30 40
SUCTION PRESSURE (PS)G)
50 60
Fig. 18 — Heating Cycle Operation Chart
50EQ034
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Table 7 — Check Valve Functions — 50EQ
CHECK VALVE
IDENTIFICATION
LOCATION
COOLING
CYCLE
HEATING
CYCLE
COOLING CYCLE
CHECK VALVE STUCK
HEATING CYCLE
CHECK VALVE STUCK
A
Outdoor
Coil
Header
Closed Open
Open Closed Open Closed
Lose
Circuiting
in Outdoor
Coil Acts
like Low
Charge Normal Normal Top 3 Circuits
Restricted
B
Outdoor
Coil
Liquid
Line
Leaving
Coil
Open Closed
Normal Restricted
Liquid
Line Flooding
Outdoor
Coil and
Compressor
Normal
C
Outdoor
Coil
Liquid
Line
Feeding
Capillaries
Closed Open
Lose Slight
Amount of
Capacity
Normal Normal Restricted
Outdoor
Capillaries
D
Indoor
Coil
Liquid
Line
Leaving
Coil
Closed Open
Bypasses
Coil and
Floods
Compressor Normal Normal Restricted
Liquid Line
E
Indoor
Coil
Header Open Closed
Normal Bottom
Circuits
of Indoor
Coil
Inactive
Lose Indoor
Coil
Circuiting
Symptom of
Low Charge
Normal
F
Indoor
Coil
Liquid
Line
Feeding
Capillaries
Open Closed
Normal Restricted
Indoor
Capillaries Lose
Small
Amount of
Capacity
Normal
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