International Comfort Products NASA201LA, NASA401LA Installation Manual

INSTALLATION INSTRUCTIONS
LowAmbient Kit
NASA201LA, NASA401LA
These instructions must be read and understood completely before attempting installation.
Safety Labeling and Signal Words
DANGER, WARNING, CAUTION, and NOTE
ard seriousness. The signal word DANGER is only used on product labels to signify an immediate haz­ard. The signal words WARNING, CAUTION, and NOTE will be used on product labels and through­out this manual and other manuals that may apply to the product.
DANGER Immediate hazards which will result in severe personal injury or death.
WARNING Hazards or unsafe practices which could result in severe personal injury or death.
CAUTION Hazards or unsafe practices which may result in minor personal injury or product or
property damage.
NOTE − Used to highlight suggestions which will result in enhanced installation, reliability, or opera­tion.
Signal Words in Manuals
The signal word WARNING is used throughout this manual in the following manner:
WARNING
!
The signal word CAUTION is used throughout this manual in the following manner:
!
Signal Words on Product Labeling
Signal words are used in combination with colors and/or pictures on product labels.
WARNING
CAUTION
!
ELECTRICAL SHOCK HAZARD
Failure to turn off electric power could result in personal injury or death.
Before installing or servicing system, turn off main power to the system. There may be more than one disconnect switch, including accessory heater(s).
NOTE: Read the entire instruction manual before starting the
installation.
Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock, or other conditions which may cause death, 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
WARNING
SAFETY CONSIDERATIONS
factoryauthorized kits or accessories when modifying this product. Refer to the individual instructions packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses, protective clothing, and work gloves. Use quenching cloth for brazing operations. Have fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions included in literature and attached to the unit.. Consult local building codes and current editions of the National Electrical Code ( NEC ) NFPA 70. In Canada, refer to current editions of the Canadian electrical code CSA 22.1.
Recognize safety information. This is the safetyalert symbol
!
!
. When you see this symbol on the unit and in instructions
or manuals, be alert to the potential for personal injury. Understand the signal words DANGER, WARNING, and
CAUTION. 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 hazards 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
Specifications subject to change without notice.
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damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation.
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
Before installing, modifying, or servicing system, main electrical disconnect switch must be in the OFF position. There may be more than 1 disconnect switch. Lock out and tag switch with a suitable warning label.
INTRODUCTION
These instructions cover the installation of Low−Ambient Pressure Switch Part No. NASA201LA and NASA401LA in all singlespeed air conditioners or heat pumps using R−22 or R410A refrigerant. This kit is also acceptable for use on 2stage air conditioners or heat pumps using R410A and permanent split capacitor (PSC) fan motors.. Refer to Table 1 for kit usage.
DESCRIPTION AND USAGE
The LowAmbient Pressure Switch Kit is a longlife pressure switch which turns the fan on and off as shown in Table 1. It is wired in series with black fan lead. Sleevebearing motors can be used with this control.
Other accessories may be required. Refer to the Required Changes for Cooling Units and Heat Pump Units section in this document for further details.
!
CAUTION
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and wear appropriate protective clothing and gloves when handling parts.
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 either routed through one of the knockout holes in unit cabinet (vertical discharge product) or through one of the service valve holes in unit cabinet (horizontal discharge product). 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.
WIRING FOR ALL VOLTAGES OF COOLING UNITS A. Single And TwoStage Non−Communicating
Capable
For all voltages of cooling units, refer to Fig. 2 and wire lowambient 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.
NOTE: To ensure electrical isolation and strain relief, it is recommended to wrap connector with UL approved electrical
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Specifications subject to change without notice.
tape overlapping the wires on each side by a minimum of 1 inch.
2. Connect remaining blue wire from low−ambient pressure switch to contactor terminal from which black fan lead was removed.
B. Single And Two−Stage Communicating Capable
For all stages of cooling units, refer to Fig. 3 and use LowAmbient Pressure Switch as follows:
1. Disconnect black fan lead from control board and connect it it to yellow or violet wire from low ambient pressure switch connector supplied.
NOTE: To ensure electrical isolation and strain relief, it is recommended to wrap connector with UL approved electrical tape overlapping the wires on each side by a minimum of 1 inch.
2. Connect blue wire from lowambient pressure switch to control board terminal from black fan lead was removed.
WIRING FOR HEAT PUMPS
Heat pumps require a normally closed Isolation Relay (Part No. NASA00101IK or equivalent) with the 24v coil connected to the C and O terminals of defrost board or control board.
A 208/230v Applications For 208/230v heat pump applications, refer to Fig. 4 and wire
lowambient pressure switch as follows:
1. Remove black lead of outdoor fan motor connected to defrost board OF2 or control board ODF depending on type of unit.
2. Install piggyback female terminal on violet wire harness (provided in isolation relay kit) to tab 1 of isolation relay. Connect nonpiggyback female termination of same violet wire to one side of provided connector. Connect the female termination of violet (or yellow) lead of low ambient pressure switch to the other side of the provided connector. Connect the female termination of the black fan motor lead to the male piggy back terminal located at tab 1 of relay.
NOTE: To ensure electrical isolation and strain relief it is recommended to wrap connector with UL approved electrical tape overlapping the wires on each side by a minimum of 1”.
3. Install piggyback female terminal on black wire harness (provided in isolation relay kit) to tab 2 of relay. Connect nonpiggyback female termination of same black wire to OF2 on defrost board or ODF on control board. Connect the female termination of blue lead of low ambient pressure switch to the male piggy back terminal located at tab 2 of relay.
4. Install orange wire (provided in isolation relay kit) to one side of the relay coil. Connect the other side to the O wire coming from defrost board or control board.
5. Install black wire (provided in isolation relay kit) to opposite side of the relay coil. Connect the other side to the C wire coming from defrost board or control board.
6. Reinstall control box cover and reconnect power to unit.
B. 460v Applications For 460v heat pump applications, refer to Fig. 5 and wire
lowambient pressure switch as follows:
1. Remove black lead of outdoor fan motor connected to outdoor fan relay terminal 3.
2. Install piggyback female terminal on violet wire harness (provided in isolation relay kit) to tab 1 of
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