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Low--A m bient
Pressur e Switch
Installation Instructions
KSA LA0201R22
KSA LA0301410
NOTE: Read the entire instruction manual before starting the
installation.
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical shock or
other conditions which may cause personal injury or property
damage. Consult a qualified installer, service agency, or your
distributor or branch for information or assistance. The qualified
installer or agency must use factory authorized kits or accessories
when modifying products.
Follow all safety codes. Installation must be in compliance with
local and national building codes. Wear safety glasses, protective
clothing, and work gloves. Have fire extinguisher available. Read
these instructions thoroughly and follow all warnings or cautions
included in literature and attached to the unit.
Recognize safety information.
This is the safety--alert symbol
. When you see this symbol on
the unit and in instructions or manuals, be a lert to the potential
for personal injury.
These words are used with the safety--alert symbol. DANGER
identifies the most serious hazards, which will result in severe
personal injury or death. WARNING signifies a hazard, which
could result in personal injury or death. CAUTION is used to
identify unsafe practices, which may result in minor personal
injury or product and property damage. NOTE is used to
highlight suggestions which will result in enhanced installation,
reliability, or operation.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before beginning any installation or modification, be sure
the main electrical disconnect is in the OFF position. Tag
the disconnect switch with a suitable warning label.
!
WARNING
INTRODUCTION
These instructions cover the installation of low--ambient pressure
switch Part No. KSALA0201R22 and KSALA0301410 in all
single--speed air conditioners or heat pumps using R--22 or
R--410A. Refer to Table 1 for kit usage. This device is a long life
pressure switch that maintains head pressure by turning the fan
off and on. Other accessories may be required. Refer to the
Required Changes for Cooling Units and Heat Pump Units
section.
DESCRIPTION AND USAGE
The low--ambient pressure switch kit is a long life pressure switch
which turns the fan on and off as shown in Table 1. It is wired in
series with black fan lead. Sleeve--bearing motors can be used
with this control.
INSTALLATION
The pressure switch is mounted inside the outdoor unit cabinet by
using adapter tube supplied. The adapter tee is mounted to liquid
service valve and tube is routed through one of the knockout
holes in unit cabinet. From inside cabinet, the flare nut is attached
to extender tube. (See Fig. 1.) The pressure switch is wired in
series with black or common fan lead.
PROCEDURE 1—WIRING FOR ALL VOLTAGES OF
COOLING UNITS
For all voltages of cooling units, refer to Fig. 2 and wire
low--ambient pressure switch as follows:
1. Disconnect black fan lead from contactor and connect this
lead to yellow or violet wire from low--ambient pressure
switch using connector supplied.
2. Connect blue wire from low--ambient pressure switch to
contactor terminal from which black fan lead was
removed.
PROCEDURE 2—WIRING FOR HEAT PUMPS
Heat pumps require a normally closed isolation relay with the
24--v coil connected to the C and O terminals of defrost board.
A. 208/230v Applications
For 208/230 --v heat pump applications, refer to Fig. 3 and wire
low--ambient pressure switch as follows:
1. Remove black fan lead from defrost board terminal OF2
and reconnect it to NC terminal of isolation relay . Connect
yellow or violet lead from low--ambient pressure switch to
same NC terminal of isolation relay.
2. Connect a wire from the other NC terminal of isolation
relay to OF2 terminal of defrost board. Connect blue lead
from low--ambient pressure switch to same NC terminal of
isolation relay.
B. 460v Applications
For 460--v heat pump applications, refer to Fig. 4 and wire
low--ambient pressure switch as follows:
1. Remove black fan lead from outdoor fan relay terminal
number 3 and reconnect it to NC terminal of isolation
relay . Connect yellow or violet lead from low--ambient
pressure switch to same NC terminal of isolation relay .
2. Connect a wire from outdoor fan relay terminal number 3
to other NC terminal of isolation relay. Connect blue lead
from low--ambient pressure switch to same NC terminal of
isolation relay.