Reversing Valve And Check Valve Position - Carrier WeatherMaker 50TCQ 17-24 Series Service And Maintenance Instructions

Single package rooftop unit with heat pump with puron (r-410a) refrigerant

Hide thumbs

Table of Contents

FROM

LIQUID

HEADER

Fig. 14 — Heat Pump — Flow as Evaporator Function

OUTDOOR COILS ONLY

Converging circuit flow in the condenser-function operation is ac-

complished with the check valve in the vapor header and the liq-

uid transfer header connected to the side ports on all but one of the

Accutrol tee nipples in each circuit. During condenser-function

operation, hot gas from the compressor discharge enters the head-

er 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 Accutrol tees

from the coil end. The refrigerant exits the tee at the side port and

enters the liquid transfer header (see Fig. 15). The refrigerant

moves through the liquid transfer header and exits through the

remaining tubes, through the side ports on the Accutrol tees (see

Fig. 16) and back into the coil circuits where additional condens-

ing 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 sub-

cooled. Subcooled liquid exits at the last Accutrol tee (see Fig. 17)

where the side port is connected to the specific mode liquid line.

Each liquid line has a check valve to prevent back-flow through

the liquid line in its opposite mode. This ensures correct flow di-

rection through the filter driers and the strainers preventing emp-

tying of off-mode liquid lines into the evaporator-function coil

circuits.

Fig. 15 — Heat Pump Accutrol — Flow as Condenser

Function/Exiting First Pass

EVAPORATOR

COIL

CIRCUITS

Fig. 16 — Heat Pump Accutrol — Flow as Condenser

Fig. 17 — Heat Pump Accutrol— Flow as Condenser