Intertek ACVC96 Service Instructions Manual page 32

INSTALLATION CONSIDERATIONS
Accessories Wiring
If it is necessary for the installer to supply additional line voltage
wiring to the inside of the furnace, the wiring must conform to all
local codes, and have a minimum temperature rating of 105°C.
All line voltage wire splices must be made inside the furnace
junction box.
The integrated control module humidifier terminal (HUM) is ener-
gized with 115 volts whenever the induced draft blower is ener-
gized. The integrated control module electronic air cleaner ter-
minals (EAC) are energized with 115 volts whenever the circula-
tor blower is energized.
In addition, the control is equipped with a dedicated humidi-
fication relay which is available through ¼ inch terminals
HUM-IN and HUM-OUT. Similar to the HUM terminal, when
utilizing legacy connections, this relay will be closed during
normal heating operation (115VAC must be present on the
HUM-IN terminal to take advantage of HUM-OUT). How-
ever, the control can provide additional humidification fea-
tures when wired to a communicating thermostat (1, 2, R, C
connections). If the communicating thermostat is not ca-
pable of providing a humidification call, this dedicated relay
will function exactly as mentioned above with a legacy setup.
If the communicating thermostat is capable of providing a
humidification call the user is now provided with 3 modes of
operations which can be selected within the thermostat user
menu.
1. ON: Humidifier is turned on during a call for heat along
with a call for humidity
2. OFF: Humidifier remains off (relay never closes).
3. IND: Humidifier will cycle with humidification demand,
independent of heat demand. This mode allows the user
to select one of 4 fan speeds (25, 50, 75, and 100%).
32
NEUTRAL
24 V H
OLT UMIDIFIER
A 24 volt hum circuit may be powered off of the n/c side of
the low fire pressure. If added in the field, the wiring must
conform to all local and national codes. Connect the COM side
of the humidifier to the C terminal on the furnace control board (or
to the COM side of the 24 VAC transformer). Do not connect
115V humidifier to these terminals.
A A S :
UXILIARY LARM WITCH
The control is equipped with a 24VAC Auxiliary Alarm Input
(12 inch purple / white wire attached to pin 6 of 15 pin con-
nector) which can be utilized with communicating mode set-
ups (typically used for condensate switch wiring but could
be used with compatible C0
Legacy mode use
In a legacy system (Non-communicating), this auxiliary alarm
input is not operational. Any auxiliary alarm switch must be
used to interrupt Y1 signal either to IFC or to UC.
Communication mode use
This feature can be activated or deactivated through the ther-
mostat user menus. By default, an AUX switch is normally
closed and opens when the water level in the evaporator coil
base pan reaches a particular level. The control will respond
by turning off the outdoor compressor and display the proper
fault codes. If the AUX switch is detected closed for 30 sec-
onds, normal operation resumes and error messages are no
longer displayed. Installer must wire control voltage (24VAC)
to AUX switch to ensure the Auxiliary Alarm Input has 24VAC
during normal operation.
24 VOLT THERMOSTAT WIRING
NOTE: Low voltage connections can be made through ei-
ther the right or left side panel. Wire routing must not inter-
fere with circulator blower operation, filter removal, or routine
maintenance.
A 40 V.A. transformer and an integrated electronic control
are built into the furnace to allow use with most cooling equip-
ment. Consult the wiring diagram, located in the Technical
Manual or on the blower door for further details of 115 Volt
and 24 Volt wiring.
sensors or Fire Alarms).
2