Fire Hazard - Carrier 25HCB6 Performance Series Installation Instructions Manual

Brazing Connections
WARNING
!

FIRE HAZARD

Failure to following this warning could result in personal
injury, death and/or property damage.
Refrigerant and oil mixture could ignite and burn as it escapes
and contacts brazing torch. Make sure the refrigerant charge is
properly removed from both the high and low sides of the
system before brazing any component or lines.
Connect vapor tube to fitting on outdoor unit vapor service valves
(see Table 2). Connect liquid tubing to adapter tube on liquid
service valve. Use refrigerant grade tubing.
Table 2 – Refrigerant Connections and Recommended Liquid
and Vapor Tube Diameters (In.)
LIQUID
UNIT SIZE
Connection Tube
Diameter Diameter
3/8
024
3/8
036
3/8
048, 060
* Units are rated with 25 ft. (7.6 m) of lineset. See Product Data sheet for performance
data when using different size and length linesets.
Notes:
1. Do not apply capillary tube indoor coils to these units.
2. For Tubing Set lengths between 80 and 200 ft. (24.38 and 60.96 m) horizontal or
20 ft. (6.1 m) vertical differential, refer to the Residential Piping and Longline
Guideline using Puron refrigerant.
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Service valves must be wrapped in a heat–sinking material
such as a wet cloth while brazing.
Apply heat absorbing paste or heat sink product between service
valve and joint. Wrap service valves with a heat sinking material
such as a wet cloth.
After wrapping service valve with a wet cloth, tubing set can be
brazed to service valve using either silver bearing or non–silver
bearing brazing material. Do not use soft solder (materials which
melt below 800°F/427°C). Consult local code requirements.
NOTE: Some outdoor units contain a mechanical fitting at the
liquid distributor. This connection is not field serviceable and
should not be disturbed.
NOTE: For Liquid Service Valve − Braze lineset to adapter tube
BEFORE bolting adapter to valve. This helps prevent overheating
and damage to plastic washer or o−ring.
For Vapor Service Valve − remove valve core from schrader port
on Service Valve BEFORE brazing.
overheating and damage to valve seals (refer to Fig. 5). Replace
valve core when brazing is completed.
VALVE CORE
Fig. 5 − Vapor Service Valve
RATED VAPOR*
Connection Tube
Diameter Diameter
3/8 3/4 3/4
3/8 7/8 7/8
3/8 7/8 1−1/8
This helps prevent
SERVICE VALVE
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Clean line set tube ends with emery cloth or steel brush. Remove
any grit or debris.
Insert line set tube ends into service valve tube stubs.
Apply heat absorbing paste or heat sink product between service
valve and joint. Wrap service valves with a heat sinking material
such as a wet cloth.
Braze joints using a Sil−Fos or Phos−copper alloy.
Install Liquid Line Filter Drier Indoor
Refer to Fig. 6 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 5 in. (127 mm) long liquid tube from
step 1.
4. Connect and braze liquid refrigerant tube to the filter drier.
Fig. 6 − Liquid Line Filter Drier
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
CAUTION
!
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 triple evacuation
procedure in service manual). Always break a vacuum with dry
nitrogen.
Deep Vacuum Method
The deep vacuum method requires a vacuum pump capable of
pulling a vacuum of 500 microns and a vacuum gage 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. A tight dry system will hold a vacuum of 1000
microns after approximately 7 minutes. See Fig. 7.
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
0 1 2
MINUTES
Fig. 7 − Deep Vacuum Graph
4
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LEAK IN
SYSTEM
VACUUM TIGHT
TOO WET
TIGHT
DRY SYSTEM
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