1

Low--Ambient

Pressure Switch

Installation Instructions

KSALA0201R22

KSALA0301410

NOTE: Read the entire instruction manual before starting the
installation.
SAFETYCONSIDERATIONS
Improper installation, adjustment, alteration, service,
maintenance,or use can causeexplosion, fire, electricalshock or
other conditions whichmay cause personal injury or property
damage. Consult a qualified installer, service agency, or your
distributoror branch for informationo r assistance.The qualified
installer or agency must use factory authorizedkits or accessories
whenmodifying products.
Follow all safety codes. Installation must be in compliance with
localand national building codes.Wear safety glasses,protective
clothing,and work gloves. Have fireextinguisher available.Read
theseinstructions thoroughlyand follow all warnings or cautions
included in literature and attachedto the unit.
Recognizesafety information.
This is the safety--alertsym bol .When you seethis symbol on
the unit and in instruction so rmanu als,b e alert to the potential
forpersonal injury.
These words are used with the safety--alert symbol. DANGE R
identifies the most serious hazards, which will result in sev ere
personal injury or death . WARNING signifies a hazard, which
could result in personalinjury or death. CAUTION is used to
identify unsafe practices, which may result in minor personal
injury or productand property damage. NOTE is used to
highlight suggestionswhich will result in enhan ced installation,
reliability,o r operation.
ELECTRICALSHOCK HAZARD
Failure to follow this warningcould result in personal
injuryor death.
Beforebeginning any installation or modification,be sure
the main electrical disconnect is in th e OFF position. Tag
thed isconnect switch with a suitable warn ing label.
!

WARNING

INTRODUCTION
Theseinstructions cover theinstallation of low--ambientpressure
switch Part No. KSALA0201R22and KSALA0301410 in all
single--speed air conditioners or heat pumps using R--22 or
R--410A.Referto Table 1 for kit usage.This device is a long life
pressureswitch that maintains headpressure 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.
DESCRIPTIONAND USAGE
The low--ambientp ressure switch kit is a long life pressure switch
whichturns the fan on and offas shown in Table1. It is wiredin
series with black fan lead. Sleeve--bearing motors can be used
with this control.
INSTALLATION
Thepressure switchis mounted inside the outdoor unit cabinetby
usingadapter tube supplied. The adaptertee is mounted to liquid
service valveand tube is routed through one of the knockout
holes in unit cabinet. From inside cab inet, the flaren ut is attached
to extender tube. (See Fig. 1.) The pressure switch is wired in
seriesw ith black or common fan lead.
PROCEDURE 1—WIRING FOR ALL VOLTAGES OF
COOLINGUNITS
For all voltages of cooling units, refer to Fig. 2 and wire
low--ambientpressu re switch as follows:
1. Disconnect black fan lead from contactor and con nectth is
lead to yellow or violet wire from low--ambient pressure
switchusing connectorsupplied.
2. Connect blue wirefrom low--ambient pressureswitch to
contactor terminal from which black fan lead was
removed.
PROCEDURE2—WIRING FOR HEAT PUMPS
Heat pumps requirea normally closed isolation relaywith the
24--vcoil connected to th eC an d O terminals of defrost board.
A.208/230v Applications
For 208/230--vheat pump applications,refer to Fig. 3 and wire
low--ambientpressu re switch as follows:
1. Remove black fan lead from defrost board terminal OF2
and reconnect it to NC terminal of isolation relay. Con nect
yellow or violet lead from low--ambient pressure switch to
same NC terminal of isolation relay.
2. Connect a wire from the other NC terminalof isolation
relayto OF2 terminal of defrostboard. Connect blue lead
from low--ambient pressure switch to same N C terminal of
isolation relay.
B.460v Applications
For 460--v heatpump applications, refer to Fig. 4 and wire
low--ambientpressu re switch as follows:
1. Remove blackfan lead from outdoor fan relay terminal
number 3 and reconnectit to NC terminal of isolation
relay. Connect yellow or violet lead fro m low--ambient
pressure switch to same NC terminal of isolation relay.
2. Connect a wire fromoutdoor fan relay terminal number 3
to otherNC terminal of isolationrelay. Connect blue lead
from low--ambient pressure switch to same N C terminal of
isolation relay.