Armstrong Air Conditioning A96DS2V - Page 37

507405-05 Page 37 of 72Issue 1621
8. An unpowered, normally open (dry) set of contacts with
a 1/4” spade terminal “HUM” are provided for humidier
connections and may be connected to 24V or 120V.
Any humidier rated up to one amp can be connected
to these terminals. In 120V humidier applications the
neutral leg of the circuit can be connected to one of the
provided neutral terminals, the terminal is energized in
the heating mode.
9. If the furnace is being matched with a non-communicating
heat pump, refer to the instructions packaged with the
dual fuel thermostat.
Generator Use - Voltage Requirements
The following requirements must be kept in mind when
specifying a generator for use with this equipment:
• The furnace requires 120 volts ± 10% (Range: 108 volts
to 132 volts).
• The furnace operates at 60 Hz ± 5% (Range: 57 Hz to
63 Hz).
• The furnace integrated control requires both polarity
and proper ground. Both polarity and proper grounding
should be checked before attempting to operate the
furnace on either permanent or temporary power.
• Generator should have a wave form distortion of less
than 5% THD (Total Harmonic Distortion).
Electrical Wiring
The furnace must be grounded and wired in accordance
with local codes or, in the absence of local codes, with the
National Electrical Code ANSI/NFPA No. 70 (latest edition)
and/or CSA C22.1 Electrical Code (latest edition) if an
external electrical source is utilized.
In all instances, other than wiring for the thermostat, the
wiring to be done and any replacement of wire shall conform
with the temperature limitation for Type T wire –63°F (35°C)
rise.
Connect a sufciently sized wire with ground to the furnace’s
line voltage connections and ground wire. Refer to the
furnace rating plate for electrical characteristics to be used
in sizing eld supply wiring and overcurrent protection.
The line voltage supply should be routed through a readily
accessible disconnect located within sight of the furnace.
A junction box on the furnace side panel is provided for line
voltage connections. Refer to the furnace wiring diagram
for specic connection information.
Proper polarity of the supply connections (“HOT” and
“NEUTRAL”) must be observed to ensure that safety
controls provide the protection intended.
Risk of electrical shock. Disconnect electrical power
at the circuit breaker or service panel before making
electrical connections. Failure to disconnect power
supplies can result in property damage, personal injury,
or death.
WARNING
A connection to the unit’s ground wire and actual earth
ground (typically a ground stake or buried steel pipe) must
be maintained for proper operation.
Non-Communicating
In non-communication applications this furnace is designed
to operate in a SINGLE-STAGE mode or TWO-STAGE mode
using a conventional thermostat.
For optimal performance in non-communicating applications,
use a high quality electronic digital thermostat or any other
with adjustable settings for 1st stage / 2nd stage ON/OFF
differentials and adjustable stage timers.
Communicating
In communicating applications the Comfort Sync™
thermostat must be used. Refer to the instructions provided
with the thermostat for installation, set-up and operation. In
communicating systems all unused thermostat wire in the
wire bundle needs to be terminated inside and out. The
extra wires can terminate on the “C” terminal of the Comfort
Sync™ communication terminal strip. Using an additional
wire come off “C” terminal and wire nut all the extra wires
together. Termination on the outdoor control must match
the indoor control. See Figure 53.
Indoor Blower Speeds
Non-Communicating
When the thermostat is set to “FAN ON”, the indoor blower
will run continuously at approximately 38% of the second
stage cooling speed when there is no cooling or heating
demand.
When the furnace is running in the heating mode, the indoor
blower will run on the heating speed designated by the
positions of DIP switches 11, 12 and 13.
When there is a cooling demand, the indoor blower will run
on the cooling speed designated by the positions of DIP
switches 5 and 6. First stage cooling will run at 70% cool
speed.
Communicating
NOTE: When this furnace is used with a Comfort Sync™
thermostat, proper indoor blower speed selections are made
by the communicating thermostat.
When the thermostat is set to “FAN ON”, the indoor blower
will run at setting determined during system conguration.
When there is a heating demand the fan will run on heating
speeds for ring rate.
When there is a cooling demand, the fan will run on the rst
stage and second stage cooling speed set using the Comfort
Sync™ thermostat in the installer setup mode. The factory
default is based upon 400 CFM per ton.