Page 24
XP25
IMPORTANT
Use a thermocouple or thermistor electronic vacuum
gauge that is calibrated in microns. Use an instrument
capable of accurately measuring down to 50 microns.
WARNING
Danger of Equipment Damage. Avoid deep vacuum
operation. Do not use compressors to evacuate a
system. Extremely low vacuums can cause internal
arcing and compressor failure. Damage caused by deep
vacuum operation will void warranty.
Evacuating the system of non-condensables is critical for
proper operation of the unit. Non-condensables are defined
as any gas that will not condense under temperatures and
pressures present during operation of an air conditioning
system. Non-condensables combined with refrigerant to
produce substances that corrode copper piping and
compressor parts.
Electrical
In the U.S.A., wiring must conform with current local codes and
the current National Electric Code (NEC). In Canada, wiring
must conform with current local codes and the current
Canadian Electrical Code (CEC).
Refer to the furnace or air handler installation instructions for
additional wiring application diagrams. See unit nameplate
for minimum circuit ampacity and maximum over-current
protection size.
24VAC TRANSFORMER
Use the transformer provided with the furnace or air handler
for low‐voltage control power (24VAC - 40 VA minimum).
LOAD SHEDDING
Utility Load Shedding Mode
ACTIVATED
– The normally
closed set of contacts in the utility load shedding control
receiver
OPEN
. This removes 24VAC from the coil of the
field-provided relay (catalog # 69J79). The relay contacts
close (terminal
7
to terminal
2
), completing the circuit
between terminals
R
and
L
on the outdoor control. The
24VAC input to terminal
L
activates the load shedding mode
in the outdoor control, cycling the outdoor unit
OFF
. The
7-Segment display on the outdoor control displays a load
shedding alert code (
E600
) and an alert appears on the
display of the iComfort Wi-Fi
®
thermostat. The customer
receives email notifications when the alert occurs, if the
option to receive notifications is selected.
Utility Load Shedding Mode DEACTIVATED
(Normal Equipment Operation)
– When load shedding is
not required, the contacts in the utility load control receiver
are closed. This provides 24VAC to the coil of the
field-provided relay (catalog # 69J79).The relay contacts
OPEN
(terminal
7
to terminal
2
) removing 24VAC from the
L
terminal on the outdoor control. This deactivates the load
shedding mode in the outdoor control. The outdoor unit
returns to normal operation and alert code clears once load
shedding mode is deactivated.
For more information, see the Load Shedding Feature
Wiring Diagram on page 48.
REFER TO THE UNIT NAMEPLATE FOR MINIMUM CIRCUIT AMPACITY,
AND MAXIMUM FUSE OR CIRCUIT BREAKER (HACR PER NEC).
INSTALL POWER WIRING AND PROPERLY SIZED DISCONNECT
SWITCH.
NOTE -
UNITS ARE APPROVED FOR USE ONLY WITH COPPER
CONDUCTORS. GROUND UNIT AT DISCONNECT SWITCH OR TO AN
EARTH GROUND.
SIZE CIRCUIT AND INSTALL DISCONNECT
SWITCH
1
NOTE -
24VAC, CLASS II CIRCUIT CONNECTIONS ARE MADE IN THE CON
TROL BOX.
INSTALL ROOM THERMOSTAT (ORDERED SEPARATELY) ON AN
INSIDE WALL APPROXIMATELY IN THE CENTER OF THE
CONDITIONED AREA AND 5 FEET (1.5M) FROM THE FLOOR. IT
SHOULD NOT BE INSTALLED ON AN OUTSIDE WALL OR WHERE IT
CAN BE AFFECTED BY SUNLIGHT OR DRAFTS.
THERMOSTAT
5 FEET
(1.5M)
INSTALL THERMOSTAT
2
SERVICE
DISCONNECT
SWITCH
Figure 14. Electrical
