Nordyne 913549A Installation Instructions

Air Conditioner and Heat Pump

Installation Instructions

Low Ambient Control Kit
R22: 913549A 10 SEER Models
918359
R-410: 918837
INTRODUCTION
These instructions are primarily intended to assist qualifi ed 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, fi re, 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 SEQUENCE
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.
Low Ambient
Control
12 and 13 SEER Models
12 through 15 SEER Models
BLUE
Figure 1. Air Conditioner Low Ambient Control Kit Wiring Diagram
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).
To "T2" on Compressor Contactor
BLUE
Line Splice
Connector
R
C
BLACK
S
Outdoor Fan
Motor