Table of Contents
Advertisement
OUTDOOR COIL METERING DEVICES
The metering devices are multiple fixed-bore devices
(Acutrol™) swaged into the horizontal outlet tubes from the
liquid header, located at the entrance to each evaporator
coil circuit path. These are non-adjustable. Service requires
replacing the entire liquid header assembly.
To check the indoor coil, disconnect the supply fan signal
(A04-A06 direct-drive fans) or contactor (IFC) coil, then start
the circuit in a Cooling Mode (jumper R to Y1 or Y2) and ob-
serve the frosting pattern on the face of the indoor coil. A
frost pattern should develop uniformly across the face of the
indoor coil starting at each tube at the Acutrol nipple
locations.
To check the outdoor coil, disconnect the outdoor fan motor.
Start the circuit in a Heating Mode (jumper R to W1 or W2)
and observe the frost pattern on the face of the outdoor coil.
Failure to develop frost at an outlet tube can indicate a
plugged or a missing orifice.
REFRIGERANT
SYSTEM
PORTS
There are two access ports in each circuit - on the suction
tube near the compressor and on the discharge tube near
the compressor. (See Fig. 19-20.) These are brass fittings
with black plastic caps. The hose connection fittings are
standard 1/4 in. SAE Male Flare couplings.
The brass fittings are two-piece High Flow valves, with a re-
ceptacle base brazed to the tubing and an integral spring-
closed check valve core screwed into the base. (See
Fig. 21.) This check valve is permanently assembled into
this core body and cannot be serviced separately; replace
the entire core body if necessary. Service tools are available
from Fast Parts that allow the replacement of the check
valve core without having to recover the entire system re-
frigerant charge. Apply compressor refrigerant oil to the
check valve core's bottom o-ring. Install the fitting body with
96 ± 10 in.-lb (1085 ±23 N-cm) of torque; do not overtighten.
Outdoor Coil
High Flow
Access Ports
Defrost
Circuit
Thermostat
2
(DFT)
LOC
Fig. 19 — CHS183 Interior
24
PRESSURE
ACCESS
Outdoor Coil
Defrost
Thermostat
(DFT)
HPS
Circuit 1
LOC
Compressor 1
HPS
Compressor 2
Specifications subject to change without notice.
Outdoor Coil
High Flow
Access Port
Defrost
Thermostat
(DFT)
Circuit 2
HPS
LOC
Fig. 20 — CHS243 Interior
.47
5/8" Hex
Core
(Part No. EC39EZ067)
Washer
O-Ring
1/2" Hex
This surface provides a metal to metal seal when
torqued into the seat. Appropriate handling is
required to not scratch or dent the surface.
Fig. 21 — CoreMax
(P/N 1173177)
Compressor Protection
COMPRESSOR OVERCURRENT
The compressor has internal limbered motor protection.
COMPRESSOR OVERTEMPERATURE PROTECTION
(IP)
The compressor has an internal protector to protect it
against excessively high discharge gas temperatures.
CRANKCASE HEATER
The heater prevents refrigerant migration and compressor
oil dilution during shutdown whenever compressor is not
operating. The heater is wired to cycle with the compressor;
the heater is off when compressor is running, and on when
compressor is off.
1. Third-party trademarks and logos are the property of their respective
owners.
Outdoor Coil
Defrost
Thermostat
High Flow
Access Port
(DFT)
HPS
LOC
Circuit
Compressor 1
Compressor 2
Seat
1/2-20 UNF RH
0.596
30°
45°
Depressor per AHRI 720
+.01/-.035
From Face of Body
7/16-20 UNF RH
®1
Access Port Assembly
CHS-180-240-01SI Rev. A
1
Advertisement
Table of Contents
