CAPFA Installation Guide

3
A CHASSIS W
ITH 80%
B, C, D CHASSIS WITH 90%
B, C, D CHASSIS WITH 80%
A CHASSIS W ITH 90%
Figure 3
9. Refrigerant Lines
CAUTION
THE COIL IS SHIPPED UNDER PRESSURE WITH AN R-410A GAS
MIXTURE. USE APPROPRIATE SERVICE TOOLS AND FOLLOW THESE
INSTRUCTIONS
TO PREVENT INJURY.
A QUENCHING CLOTH IS STRONGLY RECOMMENDED TO PREVENT
SCORCHING OR MARRING OF THE EQUIPMENT FINISH WHEN BRAZING
CLOSE TO THE PAINTED SURFACES. USE BRAZING ALLOY OF 5%
MINIMUM SILVER CONTENT.
NOTE: Refrigerant tubing must be routed to allow adequate access
for servicing and maintenance of the unit.
Do not handle coil assembly with manifold or owrator tubes.
Doing so may result in damage to the tubing joints. Always use
clean gloves for handling coil assemblies.
9.1 Tubing Size/Length
For the correct tubing size, follow the specicaon for the con-
denser/heat pump. Give special consideraon to minimizing
the length of refrigerant tubing when installing coils. Refer to
Remote Cooling/Heat Pump Technical Publicaon TP-107* Long
Line Set Applicaon R-410A for guidelines for line lengths over
80’. Leave a minimum 3” straight in line set from braze joints
before any bends.
9.2TubingPreparaon
All cut ends are to be round, burr free, and cleaned. Any other
condion increases the chance of a refrigerant leak. Use a pipe
cuer to remove the closed end of the spun closed sucon line.
9.3 Brazing
Braze joints should be made only with the connecons provid-
ed external to the cabinet. Do not alter the cabinet nor braze
inside the cabinet. To avoid overheang aer brazing, quench
all brazed joints with water or a wet rag.
A PPLYING TOO MUCH HEAT TO ANY TUBE CAN MELT THE TUBE . T ORCH
HEAT REQUIRED TO BRAZE TUBES OF VARIOUS SIZES MUST BE
PROPORTIONAL TO THE SIZE OF THE TUBE .
S ERVICE PERSONNEL MUST USE THE APPROPRIATE HEAT LEVEL FOR THE
SIZE OF
THE
TUBE BEING BRAZED
.
9.4SpecialInstruconsforFlowrator(Piston)Version
Coils in owrator version are equipped with a check style ow-
rator for refrigerant management. For most installaons with
matching applicaons, no change to the owrator piston is re-
quired. However, in mix-matched applicaons, a piston change
may be required. See the piston kit chart or consult your local
distributor for details regarding mix-matched piston sizing. If
the mix-matched applicaon requires a dierent piston size,
change the piston in the distributor on the indoor coil before
installing the coil and follow the procedure shown below.
9.5TubingConneconsforFlowratorModel
1. Loosen the 13/16 nut 1 TURN ONLY to allow high pressure
tracer gas to escape. No gas indicates a possible leak.
2. Aer the gas has escaped, remove the nut and discard the
plasc or brass cap.
3. Remove the check piston to verify it is correct and then re-
place the piston. See piston kit chart in instrucons.
4. Use a tube cuer to remove the spin closure on the sucon
line. DO NOT USE A CUTTING METHOD THAT WOULD RESULT
IN THE GENERATION OF COPPER SHAVINGS OR COPPER DUST.
5. Slide the 13/16 nut into place on the tailpiece supplied in the
literature bag or with the unit.
6. Insert liquid line into the supplied tailpiece.
Figure 4
7. Insert the sucon line into the connecon, slide the insulaon
and the rubber grommet at least 18” away from the braze
joint. Braze both liquid and sucon line joints.