Bryant 548J - Manual (Page 11)

11
To
Evaporator
Coil
Circuits
From
Liquid
Header
Metering
Orifice
C09229
Fig. 15 -- Heat Pump Acutrol — Flow as Evaporator
Function
Converging circuit flow in the condenser--function
operation is accomplished with the check valve in the
vapor header and the liquid transfer header connected to
the side ports on all but one of the Acurator tee nipples in
each circuit. During condenser--function operation, hot gas
from the compressor discharge enters the header until it
reaches the check valve which blocks further flow. The
hot gas exits the header through the tubes above the check
valve and enters these coil circuits. At the outlet of these
desuperheating and condensing circuits, the refrigerant
enters the Acurater tees from the coil end. The refrigerant
exits the tee at the side port and enters the liquid transfer
header (see Fig. 16). The refrigerant moves through the
liquid transfer header and exits through the remaining
tubes, through the side ports on the Acutrol tees (see
Fig. 17) and back into the coil circuits where additional
condensing occurs. These circuits exit into the vapor
header behind the check valve and exit through the
remaining tube on the vapor header. In this last pass
through the coil, the refrigerant is subcooled. Subcooled
liquid exits at the last Acutrol tee (see Fig. 18) where the
side port is connected to the specific mode liquid line.
From
Condenser
Coil Circuits
To
Transfer
Header
C09230
Fig. 16 -- Heat Pump Acutrol — Flow as Condenser
Function/Exiting First Pass
To
Condensing
Circuit
From
Transfer
Header
C09231
Fig. 17 -- Heat Pump Acutrol — Flow as Condenser
Function/Entering Second Pass
From
Subcooler
Circuit
To
Liquid
Line
DFT Location
(Outdoor Coils only)
C09232
Fig. 18 -- Heat Pump Acutrol — Flow as Condenser
Function/Exiting Subcooler Pass
Each liquid line has a check valve to prevent backflow
through the liquid line in its opposite mode. This ensures
correct flow direction through filter driers and strainers
and prevents emptying of off--mode liquid lines into
evaporator--function coil circuits.
Reversing Valve and Check Valve Position
See Fig. 14 on page 10.
Table 3 – 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 4 – 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
548J