Carrier Infinity 25HNB5 Installation Instructions Manual page 6

Check OAT Thermistor and OCT Thermistor
Attachments
Outdoor Air Temperature (OAT) Thermistor is factory installed by
inserting the nibs on either sides of the thermistor body through a
keyhole in the bottom shelf of the control box and locking it in
place by turning it 90 degrees, such that the spherical end of a nib
faces the front of the control box.
Check to make sure the OAT is locked in place. See Fig. 9.
OAT Thermistor must be locked in
place with spherical nib end facing
towards the front of the control box
Fig. 9 --- Outdoor Air Thermistor (OAT) Attachment
The Outdoor Coil Temperature (OCT) Thermistor is factory
installed on the 3/8" diameter stub tube located on the coil
assembly. Check to make sure that it is securely attached with the
clip as shown in Fig. 10.
Fig. 10 --- Outdoor Coil Thermistor (OCT) Attachment
START–UP
A05408
OCT Thermistor
must be secured
tight on stub tube.
A05409
CAUTION
!
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this caution may result in minor personal
injury, equipment damage or improper operation.
To prevent compressor damage or personal injury,
observe the following:
S Do not overcharge system with refrigerant.
S Do not operate unit in a vacuum or at negative pressure.
S Do not disable low pressure switch in scroll compressor
applications.
S Dome temperatures may be hot.
CAUTION
!
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal
injury.
Wear safety glasses, protective clothing, and gloves when
handling refrigerant and observe the following:
SFront seating service valves are equipped with Schrader
valves.
CAUTION
!
ENVIRONMENTAL HAZARD
Failure to follow this caution may result in environmental
damage.
Federal regulations require that you do not vent refrigerant to
the atmosphere. Recover during system repair or final unit
disposal.
Follow these steps to properly start up system:
1. After system is evacuated, fully open liquid and vapor ser-
vice valves.
2. Unit is shipped with valve stem(s) closed and caps installed.
Replace stem caps after system is opened to refrigerant flow
(back seated). Replace caps finger–tight and tighten with
wrench an additional 1/12 turn.
3. Close electrical disconnects to energize system.
4. Set room thermostat at desired temperature. Be sure set
point is below indoor ambient temperature.
5. Set room thermostat to HEAT or COOL and fan control to
ON or AUTO mode, as desired. Operate unit for 15
minutes. Check system refrigerant charge.
6