Distributor Nozzle Change-Out; Filter Drier; Txv (Thermostatic Expansion Valve); Txv Location - Carrier Aero 39MN Series Installation, Start-Up And Service Instructions Manual

TXV
UPPER
SENSING
SPLIT
BULB
AIRFLOW
15 DIAMS
MIN
10
DIAMS
LOWER
SPLIT
TXV
SENSING
BULB
AIRFLOW
15
DIAMS
MIN 10
DIAMS
LEGEND
TXV — Thermostatic Expansion Valve
Fig. 103 — Face Split Coil Suction-Line Piping
TXV SENSING
BULBS
AIRFLOW
10 DIAMS
15
DIAMS
15
MIN
DIAMS
MIN
10 DIAMS
EVAPORATOR COIL
FIRST-ON, LAST-OFF
LEGEND
TXV — Thermostatic Expansion Valve
Fig. 104 — Row Split Coil Suction-Line Piping

Distributor Nozzle Change-Out

Distributor nozzles are factory supplied. Thermostatic expansion
valves (TXVs) are either field or factory supplied. Be sure that
correct nozzle is installed in each distributor before installing
expansion valve. See Table 11 for factory-installed distributor
nozzle sizes. Use AHUBuilder
UNIT
COIL
CASING
CASING
SOLENOID
SIGHT
VALVE
GLASS
FILTER
DRIER
8
DIAMS
SOLENOID
MIN
VALVE
SIGHT
GLASS
FILTER
DRIER
TXV
INSIDE
CASING
(TYP)
DISTRIBUTOR
(TYP)
8 DIAMS
MIN
EVAPORATOR
COIL
FIRST-ON, LAST-OFF
COIL
CASING
SOLENOID
VALVE
SIGHT
GLASS
FILTER
DRIER
SOLENOID
VALVE
SIGHT
GLASS
FILTER
DRIER
8
DIAMS
MIN
TXV
8
INSIDE
DIAMS
CASING
MIN
(TYP)
DISTRIBUTOR
(TYP)
a39-2367
program to select nozzles for
®
best performance; replacement nozzles must be field-installed.
The correct nozzle is typically factory-installed.
Do not overheat distributor or cap. Failure to comply could
result in equipment damage.
Perform nozzle change-out procedure as follows:
1. Remove plastic end cap by using an electric heat gun or a
torch (see Fig. 105).
2. Clean off any grime.
3. Remove nozzle retaining ring with screwdriver or needle
nosed pliers.
4. Remove nozzle from distributor by inserting 2 no. 6-32
threaded rods (at least 4 in. long) into the threaded holes pro-
vided in the nozzle. See Fig. 106.
5. Insert correct nozzle into distributor body.
6. Re-insert nozzle retainer ring into distributor.
a39-4174
Fig. 105 — Distributor and Cap
NOZZLE
UNIT
CASING
RETAINER
RING
SIMPLIFIED NOZZLE
REMOVAL
G
5
NO. 6-32 THREADED
PULLER HOLES
Fig. 106 — Nozzle Change-Out

Filter Drier

A filter drier should be installed before the TXV to ensure satis-
factory valve operation.

TXV (Thermostatic Expansion Valve)

TXV LOCATION

Thermostatic expansion valves may be mounted in any position,
but they should be installed as close to the evaporator as possible.
If a refrigerant distributor is used with the TXV, best performance
is obtained if the distributor is mounted directly to the valve outlet.
If the distributor cannot be mounted directly to the valve outlet,
131
CAUTION
PLASTIC CAP
WITH VALVE
BODY
THREADED
PULLER RODS
TUBING
a39-2041