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Figure 2 _ Typical TXV Installation
EQUALIZER
TUBE
SENSING SUCTION
BULB TUBE
TXV
LIQUID
TUBE
._ 00'cl°ck 20,clock 7
7/8 IN. OD & SMALLER
SENSING BULB
When changing indoor piston, use a back-up wrench.
Hand tighten hex nut, then tighten with wrench 1/2 turn.
Do not exceed 30 ft-lbs.The indoor piston contains a
Teflon ring (or seal) which is used to seat against the
inside of distributor body, and must be installed properly
to ensure proper seating in the direction for cooling
operation.
Figure 3 1 Indoor (cooling) Piston
BRASS'="_
HEX NUT\ TEFLON SEAL
\ _ TEFLONRING
I!l I
I',_ I FLOWIN
lil I cOOLING
I:1 PISTON
II RETAINER
f STRAINER
]
BRASS
HEX BODY
L10S017
Installing with Indoor Piston - cooling operation.
Check piston size shipped with indoor unit to see if it
matches required indoor piston size.
If it does not match, replace indoor piston with correct
piston size. (Indoor pistons are shipped with some
outdoor models in the accessory bag and are only
qualified for Piston fan coils.)
Example fan coils with piston: FEM4P, FSM4P, FSU4P
(12 thru 4 ton).
See Figure 3.
PRODUCT OPERATION HAZARD
Failure to follow this caution may result in improper product
operation.
Ifusing a TXV in conjunction with a single-phase reciprocat-
ing compressor, a compressor start capacitor and relay are
required. Consult outdoor unit pre-sale literature for start as-
sist kit part number.
4 421 01 5103 02
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