507607-03
Issue 1827
Page 13 of 23
2. Attach high pressure gauge set and operate unit for
several minutes to allow system pressures to stabilize.
3. Compare stabilized pressures with those provided in
the charge tables on inside control box cover. Minor
variations in these pressures may be expected due
to differences in installations. Significant differences
could mean that the system is not properly charged
or that a problem exists with some component in the
system. Pressures higher than those listed indicate
Figure 14. Control Board
Non-Communicating System
For systems with a non-communicating thermostat, the system
will operate based on the settings of the jumpers located on the
control board. All system settings must be done at the control
board.
Communicating System
For a communicating system, the Comfort Sync thermostat
must be used. The complete configuration of the outdoor unit
is performed using the Comfort Sync thermostat. For complete
details on how to integrate this unit into a Comfort Sync-enabled
system, please refer to the Comfort Sync Wi-Fi installer’s system
setup guide.
100 90 70 50
100 90 70 50
100 90 70 50
100 90 70 50
100 90 70 50
55 50 45 40
55 50 45 40
55 50 45 40
55 50 45 40
ON
OFF
30
PSC
LO
PS
HI
PS
Y1
OUT
Y2
OUT
OUT
O
R
I+
I -
C
DS
O
Y1
Y2
L
W
COIL
AMB
DIS
OPEN = OFF OPEN = 90 F
2ND ST
AGE
LOCK IN
55 F
50 F
45 F
40 F
DEFROST
TERMINA
TION
100 F
90 F
70 F
50 F
COMP
SHIFT
DELA
Y
J4
J3
FA
N
CYCLING
J1
J2
ECM Y1
ECM Y2
COM
PARK
FA
N
PWM
DS TO R
7-Segment
Display
Push
Button
J2 (Two-Stage
Heat Pump Only)
Second Stage Lock-In
Temperature
55 Degree
Target
50 Degree
Target
45 Degree
Target
40 Degree
Target
(Default)
J4 (HP Only)
Compressor Shift
Delay
30 Second
Delay
(Default)
No Delay
J1 (HP Only)
Defrost Termination Temperature
100 Degree
Target
90 Degree
Target
70 Degree
Target
50 Degree
Target
Default When
Jumper is
Removed or
Missing
90
J3 (All Units)
Fan De-Icing
Jumper ON
Fan On 5 Minutes
Jumper OFF
Digable (Default)
DS to R Jumper (Two-Stage Heat Pump Only)
Break off DS to R jumper if Enhanced Dehumidification Accessory (EDA) is used
with Comfort Sync thermostat (two-stage units only).
that the system is overcharged. Pressures lower than
those listed indicate that the system is undercharged.
Verify adjusted charge using the approach method.
4. Use the same digital thermometer to check liquid line
temperature.
5. Subtract the outdoor ambient temperature from the
liquid line temperature to determine the approach
temperature.
6. Compare the approach value with those shown on
charge label located on back of control box cover
