Carrier Infinity 25VNA8 Installation Instructions Manual page 5

Outdoor Unit Connected to Factory- - Approved Indoor
Unit
Outdoor unit contains correct system refrigerant charge for
operation with factory- -approved, AHRI- -rated indoor units when
connected by 15 ft. (4.57 m) of field- -supplied or factory- -accessory
tubing, and factory- -supplied filter drier. Check refrigerant charge
for maximum efficiency.
NOTE: If the indoor furnace coil width is more than the furnace
casing width, refer to the indoor coil Installation Instructions for
transition requirements.
Install Liquid- - Line Filter Drier Indoor
Refer to Fig. 4 and install filter drier as follows:
1. Braze 5- -in. (127 mm) liquid tube to the indoor coil.
2. Wrap filter drier with damp cloth.
3. Braze filter drier to above 5- -in. (127 mm) liquid tube.
4. Connect and braze liquid refrigerant tube to the filter drier.
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in unit damage or
improper operation.
Installation of filter drier in liquid line is required.
Fig. 4 - - Liquid- -Line Filter Drier
Refrigerant Tubing connection Outdoor
Connect vapor tube to fitting on outdoor unit vapor service valves
(see Table 1).
No Installation of Adapter Tube
Although it is a heat pump this unit has a standard AC liquid
service valve. An EXV inside the unit serves as the heating
expansion device.
Sweat Connections
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
S Use a brazing shield
S Wrap service valves with wet cloth or heat sink material.
Use refrigerant grade tubing. Service valves are closed from factory
and ready for brazing. After wrapping service valve with a wet
cloth, braze sweat connections using industry accepted methods
and materials. Consult local code requirements. Refrigerant tubing
and indoor coil are now ready for leak testing. This check should
include all field and factory joints.
Evacuate Refrigerant Tubing and Indoor Coil
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Never use the system compressor as a vacuum pump.
Refrigerant tubes and indoor coil should be evacuated using the
recommended deep vacuum method of 500 microns. The alternate
triple evacuation method may be used. See Service Manual for
triple evacuation method. Always break a vacuum with dry
nitrogen prior to opening the refrigerant system for servicing.
Deep Vacuum Method
The deep vacuum method requires a vacuum pump capable of
pulling a vacuum of 500 microns and a vacuum gauge capable of
accurately measuring this vacuum depth. The deep vacuum method
is the most positive way of assuring a system is free of air and
liquid water. (See Fig. 5)
5000
4500
4000
A05227
3500
3000
2500
2000
1500
1000
500
0
Final Tubing Check
IMPORTANT: Check to be certain factory tubing on both indoor
and outdoor unit has not shifted during shipment. Ensure tubes are
not rubbing against each other or any sheet metal. Pay close
attention to feeder tubes, making sure wire ties on feeder tubes are
secure and tight.
5
CAUTION
CAUTION
LEAK IN
SYSTEM
VACUUM TIGHT
TOO WET
TIGHT
DRY SYSTEM
1 2 3 4 5 6
MINUTES
Fig. 5 - - Deep Vacuum Graph
7
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A95424