FCM/A5, FEV, FJM, FEM4, FHMA5, FMA4/5, FM(C,U)5, FS(A,M,U)4, FTMA5, F(V,X)M4, F5M4, REM4, WA(H,M,P,X) WB(G,H)L, WC(G,H)L: Service and Maintenance
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
28
A14212
Fig. 24 – Aluminum Coil Unit TXV’s
A230413
Fig. 25 – TXV Examples (Mechanical)
A93530
Fig. 26 – Refrigerant Flow-Control Device (For FB and FMA4P)
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. 26).
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.
1. Install new or cleaned piston into body.
2. Replace seal ring on retainer.
Loctite
Washer
Thermal
Expansion Valve
Thermal
Expansion Valve
PISTON
PISTON
RETAINER
BRASS
HEX NUT
BRASS
HEX BODY
TEFLON SEAL
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.
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.
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