Control Board; Resistance Values Versus Temperature; View From Top Of Base Pan - Carrier WEATHERMAKERTM TWO-SPEED 38TDB Installation And Start-Up Instructions Manual

CEBD430439-03A
SS0ID
R38
R33 R9
J1
C31
R61
R65
DEFROST
TIME (MIN)
Defrost Time
S1 R39
120
R44
R42
30 60
C18
Selectors
C16
1 2
60 30
R36
90
0
Y2
Y1
Thermostat
W1
C O M M S T A T U S
Low Voltage C
D52
D51
R
Connector
A B C D
Reserved for
Future Use
Fig. 12—Control Board
THERMISTOR CURVE
90
80
70
60
50
40
30
20
10
0
0 20 40
TEMPERATURE (DEG. F)
Fig. 13—Resistance Values Versus Temperature
Step 10—Start-Up
To prevent compressor damage or personal injury, observe
the following:
• Do not overcharge system with refrigerant.
• Do not operate unit in a vacuum or at negative pressure.
• Do not disable low-pressure switch.
C2
Low Pressure
1
PL1 PL2
Switch Connector
PL3
High Pressure
1
PL4 Switch Connector
1
Thermistor
Connection
PL5
PWM2
PWM1
BRN
To Run
BLU
Capacitor
BLK
O.D.F. Connection
YEL
CEPL130439-01
Crankcase Heater
RED
K1
R89
R85 R91
Connection
R86 R87
H K 3 8 E A 0 0 1
A01192
60 80 100
A91431
Fig. 14—View from Top of Base Pan
To prevent personal injury wear safety glasses, protective
clothing, and gloves when handling refrigerant and observe
the following:
• Back seating service valves are not equipped with Schrader
valves. Fully back seat (counterclockwise) valve stem before
removing gage port cap.
Do not vent refrigerant to atmosphere. Recover during system
repair or final unit disposal.
Follow these steps to properly start up the system:
1. The outdoor unit is equipped with a crankcase heater which
operates when the compressor is off. Energize crankcase
heater 24 hr before starting unit. To energize heater only, set
indoor thermostat to OFF position and close power disconnect
to unit.
NOTE: Starting the compressor without a minimum of 12 hr of
crankcase heat prior to initial start-up, may result in a compressor
chattering noise and possible damage to the compressor.
2. Fully back seat (open) liquid and vapor tube service valves.
3. Unit is shipped with valve stem(s) front seated and caps
installed. Replace stem caps after system is opened to refrig-
erant flow (back seated). Replace caps finger tight and tighten
additional 1/12 turn (20 ft-lb torque) with wrench.
4. Close electrical disconnects to energize system.
5. Set room thermostat at desired temperature. Be sure set point
120
is below indoor ambient and is set low enough to energize
desired speed.
NOTE: Carrier electronic thermostats are equipped with a 15-
minute staging timer. This timer prevents the two-speed system
from operating at high speed until unit has been operating in low
speed for 15 minutes unless there is at least a 5°F difference
between room temperature and thermostat set point. To force high
speed (after a minimum of 2 minutes in low speed), adjust the set
point at least 5° below room ambient.
6. Set room thermostat to COOL and fan control to AUTO or ON
as desired. Wait for appropriate time delay(s). Operate unit for
15 minutes. Check refrigerant charge.
NOTE: If unit has not operated within the past 12 hr or following
a unit power-up, upon the next thermostat high- or low-speed
demand, unit operates for a minimum of 5 minutes in high speed.
10
Control Box
Side of Unit
THERMISTOR PLACED
UNDERNEATH BASE PAN
(ATTACHED TO BASE PAN
WITH ADHESIVE)
A00430