Refrigeration System - International comfort products N4A3 Series Installation Instructions Manual

INSTALLATION INSTRUCTIONS

REFRIGERATION SYSTEM

A. COMPONENT MATCHES
Check to see that the proper system components are in
place, especially the indoor coil.
R-410A outdoor units can only be used with R-410A
specific indoor coils. If there is a refrigerant mis-match,
consult the indoor coil manufacturer to determine if a
refrigerant conversion kit is available for the indoor coil.
This outdoor unit is designed for use only with indoor coils
that utilize a TXV refrigerant metering device. If any other
type of metering device is installed on the indoor coil,
consult the indoor coil manufacturer to determine if a TXV
conversion kit is available.
CAUTION
!
PRODUCT DAMAGE HAZARD
Failure to follow this caution may result in product
damage.
Indoor coil and outdoor unit must be listed as a
certified combination (match) in the ARI Unitary
Directory of Certified Products.
Indoor coil must have R-410A specific, hard shut-
off TXV refrigerant metering device.
When installing a TXV on an indoor coil, follow the
instructions provided with the new TXV.
A typical TXV installation is shown in Figure 3.
Figure 3 Typical TXV Installation
EQUALIZER
TUBE
SENSING
BULB
TXV
SENSING BULB
(EITHER SIDE)
SUCTION
É É É É
8 O'CLOCK
421 01 5101 00
INDOOR
COIL
SUCTION
TUBE
LIQUID
TUBE
STRAP
É É É É
TUBE
4 O'CLOCK
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.
Refer to Product Specifications and Long Line
Applications Guideline for line set sizing.
NOTE: Total line set length must not exceed 200 feet.
A crankcase heater must be used when the refrigerant
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.
When the outdoor unit is higher than the indoor coil, the
vertical separation must not exceed 100 feet.
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
dehydrated or dry, sealed,
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.
Tubing can "kink" easily, and if this occurs, the entire
length of tubing must be replaced.
deoxidized, copper
5