5292154-UIM-A-0317
8
Johnson Controls Unitary Products
PISTON INSTALLATION
Install Schrader Valve Core and Piston as follows:
1.
After holding charge is completely discharged, remove black plas-
tic cap from equalizer connection port on the vertical part of the
vapor line.
2.
Distributor position must be adjusted to allow the preformed liquid
line assembly to properly line up with the hole in the tubing access
panel. Raise the distributor body approximately 2” toward the top of
the coil or what would be the top of the coil if coil was in the upflow
position. See Figure 14. Adjust as necessary.
3.
Install Schrader valve core supplied with the outdoor unit into the
equalizer fitting connection port using a valve core tool.
4.
Loosen and remove the liquid line connection nut and the sealing
disc from the distributor assembly. Note that the fitting has right
hand threads.
5.
Slide the nut over the liquid line to be installed, and discard the
seal disc.
6.
Install required size piston into the distributor. Refer to supplied
Tabular Data Sheet for specific piston size and indoor coil match
up. See Figure 15.
7.
Verify that the Teflon washer is still in place in the distributor open-
ing. See Figure 15.
8.
After piston is installed, install the liquid line to the top of the pis-
ton/distributor assembly. Hand tighten, and turn an additional 1/4
turn to seal. Do not over tighten fittings.
9.
Replace black plastic cap on unused equalizer fitting connection
port.
10. After line set is installed, leak test the system.
THERMOSTATIC EXPANSION VALVE (TXV)
INSTALLATION
The following are basic steps for installation. For detailed instructions,
refer to the Installation Instructions accompanying the TXV kit. Install
TXV kit as follows:
1.
Relieve the holding charge by depressing Schrader core on the
suction manifold stub out.
2.
After holding charge is completely discharged, loosen and remove
the Schrader core.
3.
Place a backup wrench on distributor, loosen and remove brass
distributor nut. Retain brass nut for use on liquid line. Keep Teflon
washer in place and discard sealing disk.
4.
Install the thermal expansion valve to the distributor assembly with
supplied fittings. Ensure Teflon washer is seated in distributor.
Hand tighten and turn an additional 1/4 turn to seal. Do not over-
tighten fittings. See Figure 16.
5.
Slide the nut removed in step 3 over the supplied liquid line. Place
supplied Teflon washer from TXV kit in place on TXV, and install liq-
uid line to the top of the thermal expansion valve. Adjust assembly
so liquid line aligns with hole in access panel. See Figure 14. Hand
tighten the liquid line, and apply an additional 1/4 turn to seal.
CAUTION
COIL UNDER PRESSURE.
Verify that pressure has been released by depressing Schrader valve
core shown in Figure 1.
The coil requires a metering device to be added.
See outdoor unit documentation for correct TXV or piston to be used.
NOTICE
To prevent moisture and contaminates from entering the system, the
coil should not be open to atmosphere for extended periods of time. If
the coil cannot be brazed into the refrigeration system during a rou-
tine installation period, the ends should be temporarily closed or
plugged. For a short term delay, use masking tape over the ends of
the copper tubing to close the tube from the air. For a longer term
delay, use plugs or caps. There is no need to purge the coil if this pro-
cedure is followed.
WARNING
Failure to install Schrader Valve Core in the vapor line
equalizer con-
nection port
for piston applications could result in total refrigerant loss
of the system!
FIGURE 14:
Recommended Distributor Adjustment
!
!
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FIGURE 15:
Piston Installation
CAUTION
Do not overtorque. Do not use slip joint pliers. This will distort the alu-
minum distributor and the brass fitting (potentially causing leaks).
CAUTION
Outdoor unit model numbers ending with an “H” have a factory
installed hard start kit which is required when a TXV is installed. Out-
door unit model numbers with no “H” ending may require a hard start
kit. See outdoor unit technical guide.
IMPORTANT
Refer to the Technical Guide for the unit to determine the proper TXV
kit to be used on this product.
CAUTION
Do not over-torque. Do not use slip joint pliers. This will distort the
aluminum distributor and the brass fitting (potentially causing leaks).
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