48
Fig. 56 — Typical Unit Piping Schematic (50HCQ08, 09 Shown)
COMPRESSOR
ACCUMULATOR
HPS
COMPRESSOR
ACCUMULATOR
HPS
Reversing
Valve
Reversing
Valve
Accuater
(7.5 ton units only)
Filter
Drier
2B
1B
LPS/LOC
Acutrol
DFT 1
Cooling Liquid Lines
DFT 2
2A
1A
1D
2D
Outdoor Coil
Indoor Coil
Comp 2
Comp 1
2C
1C
Strainer
Heating Mode Liquid Lines
TXV
TXV
Accuater
(7.5 ton units only)
Table 21 — Cooling Mode (each circuit)
COMPONENT STATUS/POSITION
Reversing Valve Energized
Check Valve A Closed
Check Valve B Open
Check Valve C Closed
Check Valve D Open
Table 22 — Heating Mode (each circuit)
COMPONENT STATUS/POSITION
Reversing Valve De-energized
Check Valve A Open
Check Valve B Closed
Check Valve C Open
Check Valve D Closed
Table 23 — Defrost Mode
COMPONENT STATUS/POSITION
Defrost Thermostat Closed
Outdoor Fan(s) Off
Reversing Valve Energized
Check Valve A Closed
Check Valve B Open
Check Valve C Closed
Check Valve D Open
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