KeepRite N4A3 Installation Instructions Manual page 5

INSTALLATION INSTRUCTIONS
When installing a hard shut−off TXV on an indoor coil, fol-
low the instructions provided with the new TXV.
A typical hard shut−off TXV installation is shown in Figure
3.
Figure 3 Typical TXV Installation
EQUALIZER
TUBE
SENSING
BULB
HARD
SHUT−OFF
TXV
SENSING BULB
(EITHER SIDE)
SUCTION
É É É É
8 O'CLOCK
Figure 4
Model Size
18 (12 ton), 24 (2 ton)
30 (22 ton), 36 (3 ton)
42 (32 ton), 48 (4 ton)
60 (5 ton)
NOTE: If the line set length exceeds 80 feet, also refer to Extended Length Refrigeration Piping Manual for addi-
tional information.
WARNING
!
PERSONAL INJURY HAZARD
Failure to relieve system pressure could result in
personal injury and/or death.
Relieve pressure and recover all refrigerant before
servicing existing equipment, and before final unit
disposal. Use all service ports and open all flow−
control devices, including solenoid valves.
421 01 5100 01
INDOOR
COIL
SUCTION
TUBE
LIQUID
TUBE
STRAP
É É É É
TUBE
4 O'CLOCK
R−410A Line Set Tube Diameter (Liquid Tube Always a" " dia.)
Service Valve Fittings
Liquid Suction
a" s"
a" w"
a" d"
a" d"
R−410A Split System Air Conditioner
B. REFRIGERANT LINE SETS
The refrigerant line set must be properly sized to assure
maximum efficiency and proper oil circulation. Select line
set tube diameters as specified in Figure 4.
NOTE: Total line set length must not exceed 200 feet.
NOTE: A crankcase heater must be used when the refrig-
erant line length exceeds 80 feet.
If outdoor unit is more than 10 feet higher than the indoor
coil, refer to the Extended Length Refrigeration Piping
Manual for instructions.
NOTE: When the outdoor unit is higher than the indoor
coil, the vertical separation must not exceed 100 feet.
NOTE: When the outdoor unit is lower than the indoor
coil, the vertical separation must not exceed 50 feet.
If it is necessary to add refrigerant line in the field, use de-
hydrated or dry, sealed, deoxidized, copper refrigeration
tubing. Do not use copper water pipe.
Do not remove rubber plugs or caps from copper tubing
until connections are ready to be made.
Be extra careful when bending refrigeration tubing. Tub-
ing can "kink" easily, and if this occurs, the entire length of
tubing must be replaced.
Line Set < 80 feet long
Suction Line Diameter
s"
w"
d"
!8"
CAUTION
!
UNIT OPERATION HAZARD
Failure to follow this caution may result in improp-
er product operation.
Do not leave system open to atmosphere any lon-
ger than absolutely required for installation. Inter-
nal system components − especially refrigerant
oils − are extremely susceptible to moisture con-
tamination. Keep ends of tubing sealed during
installation until the last possible moment.
Line Set 80 − 200 feet long
Suction Line Diameter
w"
d"
!8"
!8"
5