33
Service tools are available from RCD that allow the replacement
of the check valve core without having to recover the entire sys-
tem refrigerant charge. Apply compressor refrigerant oil to the
check valve core’s bottom o-ring. Install the fitting body with
96 ± 10 in-lbs (1085 ± 23 N-cm) of torque; do not overtighten.
Fig. 36 — CoreMax
1
Access Port Assembly
HOT GAS BYPASS VALVE ADJUSTMENTS
Refer to Fig. 30 for a unit piping schematic with factory option
Hot Gas Bypass control.
The suction pressure regulating valve is located between the
unit’s compressor discharge line and the desuperheating tank. A
suction pressure tube is connected between the regulating valves
and the unit suction line. This valve is factory set to begin to
open as suction pressure drops below 109 psig (752 kPa). This
valve can be adjusted by removing the cover bolt on the valve to
expose the Allen key socket. One turn of this stem provides a
5 psig (34 kPa) change in valve opening setting. CW turn reduc-
es the opening setting. CCW turn increases the opening setting.
MAXIMUM CCW adjustment is one turn.
The factory setting is designed to provide a longer run time
during first stage cooling operation by beginning to open at ap-
proximately 36°F (2°C) evaporator saturated suction tempera-
ture as space load approaches satisfaction. This extended run
time will provide additional dehumidification effect.
Comfort Alert Diagnostic Module
The Comfort Alert
2
Diagnostic Module (CADM) monitors and
analyzes data from the Copeland Scroll three-phase compres-
sor and the thermostat demand. The CADM also provides a
3-minute anti-recycle time delay to compressor cycling. Each
compressor has a separate CADM module.
The CADM detects causes for electrical and system related
failures without any sensors. Flashing LEDs communicate the
Alert codes to guide service technicians in accurately and
quickly troubleshooting the system and determining root cause
for the failure.
Inputs to the CADM include 24-vac power, thermostat Y1 or
Y2, compressor contactor coil (common side) and compressor
power leads (from the compressor contactor). See Table 19.
Table 19 — Comfort Alert Diagnostic Module Inputs
* Only applies to 569J*07-0
8
G/H.
Control of the compressor contactor coil is through a normally-
closed (power on the module) contact between terminals P and C.
Communications of status and alert conditions is through three
LEDs located on the top edge of the module housing (see
Fig. 37): POWER (green), ALERT (yellow), and TRIP (red).
Fig. 37 — CADM Housing/LED Locations
The POWER LED indicates the presence of control power to
the CADM.
The ALERT LED indicates an abnormal condition exists in the
system through a flash code. The ALERT LED will blink a
number of times consecutively, pause and the repeat the pro-
cess. The number of blinks, defined in Table 20, correlates to a
particular abnormal condition; troubleshooting tips are provid-
ed for each Alert code. Reset of the ALERT may be automatic
or manual. If the fault condition causing the Alert is self-cor-
rected, the Alert code will be removed and the CADM will au-
tomatically reset and allow the system to restart normally.
Manual reset requires that main power to the 569J unit be recy-
cled after the cause for the Alert condition has been detected
and corrected.
The TRIP LED indicates either a time-delay period is currently
active (RED LED is blinking) or the module has locked out the
compressor (RED LED is on steady). A lockout condition will
occur when the CADM detects a thermostat demand at input Y
but there is no power at the compressor line terminals T1 or T2
or T3. This lockout can occur due to a safety switch (LPS or
HPS) opening and de-energizing the compressor contactor, the
compressor-motor internal overload opens, or other internal
power interruption has occurred. Reset of the TRIP LED re-
quires that unit main power be recycled after the loss of power
to the compressor condition has been detected and corrected.
Simultaneous blinking of YELLOW and RED LEDs indicates
control power input to the CADM is low. Check control circuit
transformer and wiring.
TROUBLESHOOTING THE CADM WIRING
Flashing LEDs also indicate wiring problems to the CADM.
See Tables 20 and 21 for discussion of additional LED flash
codes and troubleshooting instructions.
1. CoreMax is a registered trademark of Fastest, Inc.
2. Comfort Alert is a trademark of Emerson Climate Technologies.
1/2-20 UNF RH
30°
0.596
.47
5/8” HEX
SEAT
CORE
WASHER
DEPRESSOR PER ARI 720
+.01/-.035
FROM FACE OF BODY
7/16-20 UNF RH
O-RING
45°
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.
(Part No. EC39EZ067)
INPUT
TERMINAL
VOLTAGE
Control Power
R
24-v
Demand*
Y2
24-v
Control Common
C
24-v
Cooling
Y
24-v
Contractor Coil
P
24-v
Line A
T1
Line
Line B
T2
Line
Line C
T3
Line
POWER
(GRN)
ALERT
(YEL)
TRIP
(RED)
POWER
ALERT
TRIP
Commercial Diagnostics
Comfort Alert
™
Green LED - 24VAC Power
Yellow LED - Flash Code
2 System Pressure Trip
3 Short Cycling
4 Locked Rotor
5 Open Circuit
6 Missing Phase
7 Reverse Phase
8 Welded Contactor
9 Low Voltage
Red LED - Protector Open
or no compressor power
Active
Protection
PROT breaks 24VAC common
leg of compressor contactor coil
Reset codes and PROT lockout
by removing 24VAC to module
For Two-Stage Applications:
DC SOL operating range: 4-18VAC
Compressor second stage is
energized when YA & Y2 are 24VAC
and Alert and Trip LEDs are off
EMERSON™
Climate Technologies
T1
T2
T3
