5
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
0 1 2 3 4 5 6 7 8 9
10
LEAK(S)
PRESENT
MINUTES
V
AC
U
U
M
IN
MI
C
R
O
N
S
CONDENSIBLES OR SMALL
LEAK PRESENT
NO LEAKS
NO CONDENSIBLES
Refer to the Remote Condensing Unit Service Manual for more
detailed instructions on system evacuation, preliminary charge
adjustment, and final charge adjustment.
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 reciprocating compressors and non-bleed TXV’s
require a Hard Start Kit.
This unit is designed for three phase operation. DO NOT OPERATE
ON A SINGLE PHASE POWER SUPPLY. Measure the power supply
to the unit. The supply voltage
must
be in agreement with the
unit rating plate power requirements and within the range listed
below:
RATED
VOLTAGE
MINIMUM SUPPLY
VOLTAGE
MAXIMUM SUPPLY
VOLTAGE
208/230V
197
253
460V
414
506
The condensing unit rating plate lists pertinent electrical data nec-
essary for proper electrical service and overcurrent protection.
Wires should be sized to limit voltage drop to 2% (max.) from the
main breaker or fuse panel to the condensing unit. Consult the
NEC, CEC, and all local codes to determine the correct wire gauge
and length. The wire size must be sufficient to carry the Minimum
Circuit Ampacity (MCA) listed on the serial plate.
The supply voltage can be unbalanced (phase to phase) within
2%. The following formula can be used to determine the percent-
age of voltage unbalance for your unit.
Percentage
Voltage
Unbalance
=
100 x
Max. Voltage Deviation From
Average Voltage
Average Voltage
Example:
L1-L2 = 220V
L2-L3 = 216V
Average Voltage
=
(220 + 216 + 213)/3
=
649/3
Maximum Deviation from Average = 220 - 216 = 4
% Voltage Unbalance = 100 x (4/216)
= 400/216
10
15
20
25
30
35
40
45
14
75
50
37
NR
NR
NR
NR
NR
12
118
79
59
47
NR
NR
NR
NR
10
188
125
95
75
63
54
NR
NR
8
301
201
150
120
100
86
75
68
6
471
314
235
188
157
134
118
110
*Based on NEC 1996
MAXIMUM ALLOWABLE LENGTH IN FEET
TO LIMIT VOLTAGE DROP TO 2%
Minimum Circuit Ampacity (MCA)
Wire Size
(AWG)
Example:
A 7 ½ Ton unit is to be installed. The distance from the
building to the unit is 75’. Calculate the minimum wire size
assuming no more than 2% voltage drop.
MCA for 7 Ton 230V unit = 43.3 (from S&R plate).
Applying previous table wire sizes less than #8 AWG cannot
be used for circuits which have a rating of 45A. The #8 wire
is not suitable since the maximum length for a 45A circuit
is 68’.
Solution: Use a #6 AWG wire suitable up to 110’.
NOTE: It is the contractors’s responsibility to follow the NEC
(USA) or CEC (Canada) when sizing the service wire for this
unit.
½
*Always refer to the unit’s S&R plate for actual ratings.
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.
