Installation guide

(D nO
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DO _O
Defrost Time , .*_' _7 "_"
Selectors r'_J',_- "-'
z
age HJ_=
Low Volt
Connector E-- _ _
Reserved tor
Future Use
F_ [,-IZIIj_]]Z.YJ
Fig. 12_ontrol Board
THERMISTOR CURVE
Low Pressure
€-Switch Connector
_-High Pressure
Switch Connector
4-Thermistor
Connection
] CT°apRaUcntor
O.D.R Connection
Crankcase Heater
Connection
A01192
90 , I i I I
80_ _ _ I _ I
I I I I I
70 -I - _ I _ T -'I-
I \ I I _ 1
40 _----_-- • I • I
I \ i I I I
'
,•,
= I I
n , ........
0 20 40 60 80 100 120
TEMPERATURE(DEG. F)
A91431
Fig. 13--Resistance Values Versus Temperature
Step lO--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.
Control Box
Side of Unit
-- THERMISTOR PLACED
UNDERNEATH BASE PAN
(ATTACHED TO BASE PAN
WITH ADHESIVE)
A00430
Fig. 14-_View from Top of Base Pan
To prevent personal injury wear safety glasses, protective
clothing, and gloves when handling lefrigerant 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.
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
crankc:kse 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 ti_aten
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
is be]ow 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 themtostat 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 thez_ostat to COOL and fan control to AUTO or ON
as desired. Walt for appropriate time delay(_). Operate unit for
15 minutes. Check refrigerant ch,'trge.
NOTE: If unit has not operated within the past 12 hr or following
a unit power-up, upon the next tbem_ostat high- or low-speed
demand, unit operates for a minimum of 5 minutes in high speed.
10