Nordyne 913549A User manual

INSTALLATION SEQUENCE

Low Ambient Control Kit

R22: 913549A 10 SEER Models

918359 12 and 13 SEER Models

R-410: 918837 12 through 15 SEER Models

INTRODUCTION

These instructions are primarily intended to assist qualiﬁed individuals experienced in the proper installation of

heating and/or air conditioning appliances. Before beginning the installation, read these instructions thoroughly and

follow all warnings and cautions in the instructions and on the unit. Improper installation, service, adjustment, or

maintenance can cause explosion, ﬁre, electrical shock, or other conditions which may result in personal injury or

property damage.

The Low Ambient Control Kit is designed for use in air-conditioner and heat pump products. The kit consists of

a pressure switch, a service adapter tee, a 24V relay for heat pump applications, and miscellaneous parts for

mounting. The kit is intended to maintain system pressures at normal levels should cooling be required at low outdoor

temperatures. The pressures are controlled by a pressure switch that cycles the outdoor fan motor. When the liquid

pressure drops below the designated pressure setting, the fan motor is switched off. If the liquid pressure then rises

above the recommended pressure setting, the fan motor is switched on again.

Installation Instructions

Air Conditioner and Heat Pump

WARNING:

To avoid risk of electric shock, personal injury,

or death,disconnect electrical power to the unit

before performing any maintenance or service.

The unit may have more than one electric power

supply.

The installation sequence is as follows:

1. Read these installation instructions completely before

proceeding.

2. Disconnect all power to the unit.

3. At the front of the unit remove the service panel to the

control box. This will have all of the electrical control

components within and in the case of the R4 units

the gas control components as well.

4. Remove the front panel with the service ports and

drain tube opening from the unit.

5. There are two service valves in the interior of the

unit. Locate the one in the 1/2” diameter compressor

discharge line. In the case of a split system, locate

the 3/8” service valve (high side).

Figure 1. Air Conditioner Low Ambient Control Kit Wiring Diagram

BLUE

Low Ambient

Control

Line Splice

Connector

BLACK

Outdoor Fan

Motor

To "T2" on Compressor Contactor

BLUE

O’Fallon, MO

708175C (Replaces 708175B)

Speciﬁcations and illustrations subject to change

without notice and without incurring obligations.

Printed in U.S.A. (07/06)

b) Connect the two black wires to terminals #1 and

#3 on the relay and route the wires through the low

voltage divider. Connect one black wire to “O” on

the defrost board. Connect the other black wire

to 24V common ( “C” on the defrost board).

c) Connect the “Y” adapter terminal, provided with

the kit, to terminal #4 of relay.

d) Remove the black outdoor fan motor wire from

“DF2” on the defrost board and connect it to the

adapter on terminal #4 of relay.

e) Connect the piggyback end of the white wire to

terminal #5 of relay and connect the other end to

“DF2” on the defrost board.

f) Connect one wire lead from the pressure switch

to terminal #5 of relay and the other to terminal

#4 of relay.

8. Tie all wires back as needed.

9. Replace the service panels removed in Steps #2

through #5.

10. Restore power to the unit.

6. Remove the cap from the service valve. Mount the

service adapter tee, provided with kit, onto the service

valve and tighten. Mount the pressure switch onto

the port of service adapter that does not have valve

core and tighten. Replace the cap, removed from the

service valve, onto service port of adapter tee that

includes a valve core.

7. Route the two wire leads from the switch through the

wire grommet at the top of the panel separating the

compressor from the control box.

A. For Air Conditioners

a) Remove the fan motor common lead from “T2” on

the contactor (black wire).

b) Using wire splice provided connect one lead from

the pressure switch to the fan motor lead.

c) Connect the other pressure switch lead to “T2” on

the contactor. (See Figure 1)

B. For Heat Pumps

a) Mount the relay provided in the control box, near

the low voltage compartment.

Figure 2. Heat Pump Low Ambient Control Kit Wiring Diagram

Low Ambient

Control

BLACK

Outdoor Fan

Motor

WHITE

To "DF2" on

Defrost Board

(Y Adapter Terminal)

BLACK

To "C" on Defrost Board

To "O" on Defrost Board

BLUE

¢7081759¤

708175C

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