Installation - Low Ambient - Light Commercial User Manual

Installation Instructions
Light Commercial Series Accessory - R-410a Equipment
Low Ambient Kit, Differential Pressure Control
This kit will allow the installation of a differential head-pressure
control on Nordyne, Light Commercial Packaged Gas/Electric
and Electric/Electric units for cooling operation under low
ambient conditions. The differential pressure switch will
monitor the Stage 1 compressor discharge pressure and
cycle the outdoor fans on-and-off in order to protect the
compressor from low suction line conditions.
WARNING:
This kit is to be installed by a qualifi ed service
technician in accordance with these instructions
and all codes having jurisdiction. Failure to follow
these instructions could result in serious injury,
property damage, or death.
WARNING:
All electrical wiring must comply with the latest
edition of the National Electrical Code ANSI/NFPA
70.
These instructions are primarily intended to assist qualifi ed
individuals experienced in the proper installation of this
appliance. Some local codes require licensed installation/
service personnel for this type of equipment.
Kit Contents:
1. Differential Pressure Control for R-410a with integral
capillary tube
a. Pressure Control
b. Pressure Control Parts bag:
i. 10-32 screws & washers (2 ea.)
c. Manufacture’s Installation Instructions
d. Indoor Mounting Bracket (not used)
2. Outdoor Mounting bracket
3. Outdoor bracket Cover-plate
4. Electrical wires for control connection:
i. 200” – long: 12.5 & 15T models
ii. 90” – long: 6 – 10T models
iii. Jumper wire assembly (orange): 7.5-15T
models
5. Parts bag:
a. Service Valve “T” fi tting
b. 7/8” Star bushing
c. 4” long – sheet metal edge guard
d. #10 – ½” Self drilling/tapping screws (2 ea.)
e. # 10 – ½” Blunted screw (1 ea.)
f. Zip-ties (6 ea.)
g. Warning Sticker
6. These Instructions
Installation Instructions
1. Set Indoor thermostat to “Off” position.
2. Disconnect all electrical power to appliance.
3. Remove the stage 1 compressor access panel or grill
and the control panel access panel.
4. Install Low ambient control to the mounting bracket using
the two (2) 10-32 mounting screws & washers that are
located in the box for the pressure control. (See Figure 1.)
Install the 7/8” Star bushing in the bottom of the pressure
control.
Figure 1.
Figure 2.
WARNING LABLE
OUTDOOR CONTROL
COVER
CONTROL ADJUSTMENT
PRESURE CONTROL
PRESURE CONTROL
MOUNTING SCREWS
(#10-32)
OUTDOOR MOUNTING
BRACKET
CONTROL COVER MOUNTIN
G
USE BLUNT-TIP SCREW
5. Install the Low ambient control/mounting bracket assembly
to the Stage one compressor base-plate. Center the
bracket between the compressor mounting bolts and
use the self-tapping screws to attach the bracket to the
base-plate.