5
NO LEAKS
NO CONDENSIBLES
•
If the pressure rises to 1000 microns or less and remains
steady the system is considered leak-free; proceed to startup.
• If pressure rises above 1000 microns but holds steady be-
low 2000 microns, moisture and/or noncondensibles may
be present or the system may have a small leak. Return to
step 2: If the same result is encountered check for leaks as
previously indicated and repair as necessary then repeat
evacuation.
•
If pressure rises above 2000 microns, a leak is present. Check
for leaks as previously indicated and repair as necessary
then repeat evacuation.
Electrical Connections
HIGH VOLTAGE!
Disconnect ALL power before servicing.
Multiple power sources may be present. Failure to do
so may cause property damage, personal injury or
death due to electric shock. Wiring must conform with
NEC or CEC and all local codes. Undersized wires could cause
poor equipment performance, equipment damage or fire.
To avoid the risk of fire or equipment damage, use copper
conductors.
NOTICE
Units with rotary or reciprocating compressors and non-bleed
TXV’s require a Hard Start Kit.
The condensing unit rating plate lists pertinent electrical data
necessary for proper electrical service and overcurrent protec-
tion. Wires should be sized to limit voltage drop to 2% (max.)
from the main breaker or fuse panel to the condensing unit. Con-
sult the NEC, CEC, and all local codes to determine the correct wire
gauge and length.
Local codes often require a disconnect switch located near the
unit; do not install the switch on the unit. Refer to the installation
instructions supplied with the indoor furnace/air handler for spe-
cific wiring connections and indoor unit configuration. Likewise,
consult the instructions packaged with the thermostat for mount-
ing and location information.
Overcurrent Protection
The following overcurrent protection devices are approved for
use.
•
Time delay fuses
•
HACR type circuit breakers
These devices have sufficient time delay to permit the motor-com-
pressor to start and accelerate its load.
Three Phase Compressor Rotation
Use care when handling scroll compressors. Dome temperatures
could be hot.
CAUTION
Three phase compressors are power phase dependent and can
rotate in either direction.
Verify proper rotation for three phase compressors by ensuring
the suction pressure drops and discharge pressure rises when the
compressor is energized. NOTE: When operated in reverse, a three
phase scroll compressors is noisier and its current draw sub-
stantially reduced compared to marked values.
To correct, disconnect power and switch any two leads at the unit
contactor and re-observe.
High Voltage Connections
Route power supply and ground wires through the high voltage
port and terminate in accordance with the wiring diagram pro-
vided inside the control panel cover.
Low Voltage Connections
The indoor transformer must supply 24 volt AC low voltage power
to the outdoor section for the control wiring. Cooling only units
require 25VA minimum and heat pump units require 40VA mini-
mum. Low voltage wiring for two-stage units depends on the ther-
mostat used and the number of control wires between the indoor
unit and the condensing unit. Route control wires through the low
voltage port and terminate in accordance with the wiring diagram
provided inside the control panel cover.
