FCM4, FEV, FEM4, FJM, FMA4, FSA4, FSM4, FSU4, FVM4, FXM4, REM4, WAH, WAM, WAP, WAX, WBHL: Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
25
A14212
Fig. 21 – Aluminum Coil Unit TXV’s
A93530
Fig. 22 – Refrigerant Flow-Control Device
FEM4P, WAPM, WAPT, WAPL, REM4P
Piston Body Cleaning and Replacement
1. Pump down outdoor unit. Close service valves at outdoor unit.
2. Recover remaining refrigerant from tubing and coil through gage
port on vapor-tube service valve. Disconnect refrigerant (liquid)
tube from piston body (Fig. 22).
3. Avoid damaging seal ring or machined surfaces on piston, bore, and
retainer.
4. Using small wire with a hook on end of it, remove piston from
body.
5. Install new or cleaned piston into body.
6. Replace seal ring on retainer.
7. The threads are coasted with Loctite Heavy Duty Anti-Seize, it is
recommended to reapply with the thread sealer.
8. Reconnect refrigerant tube to piston body.
9. Pressurize tubing and coil, then leak check.
10. Evacuate tubing and coil as necessary.
LIQUID TUBE STRAINER
In all units, the TXV and refrigerant flow-control device is protected on
the indoor coil by a wire mesh strainer. It is located inside the 3/8-in.
liquid tube at field braze joint just outside unit casing. Access to strainer
is through field braze joint.
Aluminum Coil Repair
Repairing leaks on aluminum coils is possible using the aluminum
brazing method. Specific braze and flux material designed for aluminum
are necessary for aluminum brazing. A kit containing all materials
necessary for making an aluminum coil braze repair is available through
FAST (kit #1184905). Do not use a wire brush previously used to clean
copper when preparing an aluminum braze site. Copper particles in
contact with an aluminum coil may cause premature failure. Service
aluminum coils are also available as a coil repair option.
Loctite
Washer
Thermal
Expansion Valve
Thermal
Expansion Valve
CAUTION
!
ENVIRONMENTAL HAZARD
Failure to follow this caution may result in environmental damage.
Do not vent refrigerant to atmosphere. Recover during system repair or
final unit disposal.
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution could result in equipment damage.
Damage may occur to the scroll compressor if operated at a negative
suction pressure during a system pumpdown.
PISTON
PISTON
RETAINER
BRASS
HEX NUT
BRASS
HEX BODY
TEFLON SEAL
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution could result in equipment damage.
When cleaning the piston orifice, be careful not to scratch or enlarge the
opening, as this will affect operation.
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution could result in equipment damage.
Use a backup wrench and do not over tighten, as deformation of the
piston body will occur, causing the piston to lodge in a partially open or
closed position.
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