Carrier 50HJ015 - Page 15

Table 9 - Economizer Checkout Procedures
100
test procedure
RESULTS
A Disconnect power at
TR and TR1
Disconnect jumper
between P and
PI. See Fig 14
B. Jumper TR to 1
C. Jumper T1 to T.
D. Disconnect outdoor-air
thermostat connections
from S Q and +
Factory-installed
800 ohm resistor
should remain connected
to S R and +.
E Reconnect power to
terminals TR and TR1
1. LED (light-emitting diode)
should be off.
2. Motor is in closed position
TEST PROCEDURE
RESULTS
A Disconnect
factory-installed
resistor from
terminals S R and +
1 LED (light-emitting diode)
should be on
2. Motor drives toward open
Table 10 — High and Low Outdoor-Air
Temperature Simulation
TEST PROCEDURE
RESULTS
A Reconnect factory-
installed 800 ohm resistor
between terminals
S R and +
B. Connect 1200 ohm
checkout resistor
between terminals
S Q and +.
C. Turn set point potentiom¬
eter to position A
Low outdoor-air temperature
test results:
1 LED (light-emitting diode)
should be on
2 Motor drives toward open
D. Turn set point potentiom¬
eter to position D
E Disconnect 1200 ohm
checkout resistor
High outdoor-air temperature
test results
1 LED should be off
2 Motor drives toward closed.
TO USE COOLING CHARGING CHART - Take out¬
door ambient temperature and read the suction pressure gage.
Refer to appropriate chart to determine correct suction tem¬
perature. If suction temperature is high, add refrigerant. If
suction temperature is low, carefully reclaim some of the
charge. Recheck suction pressure as charge is adjusted
Filter Drier — Replace whenever refrigerant system is
exposed to atmosphere.
40 50 60
SUCTION LINE TEMP (F)
Fig. 23 — Cooling Charging Chart — 50HJ015
Fig. 24 - Cooling Charging Chart - 50HJ024
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