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Manual 2100-707D
Page
17 of 39
Y1 terminal is the 24VAC input for Balanced Climate
compressor cooling operation. The Y2 terminal is the
24VAC input for compressor cooling standard operation.
Y1 and Y2 are connected with a brass jumper bar which
can be removed to enable Balanced Climate mode.
Units with an economizer will not have the brass jumper
installed. Refer to vent manuals for instructions on how
Balanced Climate works with each vent.
To operate in Balanced Climate mode, a 2-stage cooling
thermostat is required. The lower indoor airflow operation
is overridden by utilizing a 2-stage thermostat. If the call
for cooling is not satisfied within a given time frame or
temperature differential (specified by the thermostat),
the thermostat will send a signal to Y2 which then
increases the blower speed back to the selected speed.
See pages 33 – 35 for blower speed selection options.
Refer to page 21 for additional Balanced Climate
requirements and limitations.
Ventilation Features (Optional)
See ventilation instructions provided with unit for low
voltage wiring.
Low Ambient Control (LAC)
The low ambient control is a pressure switch that is
attached to the liquid line of the system and monitors
high side pressure. Operation of the LAC occurs as
outdoor temperatures drop below 60°F. On/Off and
modulating controls are used which operate based
on pressure changes caused by outdoor temperature
changes. On/Off LAC operation cycles the condenser
fan on/off to maintain desired liquid pressure while
modulating LAC operation is factory adjusted and slows
the condenser fan speed (rpm).
Outdoor Temperature Switch and Freeze Protection
Thermostat
An outdoor temperature switch and an evaporator
freeze protection thermostat is supplied with all units
that have a low ambient control. The outdoor switch
disables Balanced Climate mode (if enabled) when the
temperature drops below 50°F. This prevents potential
evaporator coil freeze up issues. The freeze thermostat
cuts out compressor operation if the evaporator begins
to freeze up.
Alarm Relay Feature (Controls Option)
The alarm relay provides a set of NO (normally open)
and NC (normally closed) pilot duty contacts that
operate when the compressor control module locks out
compressor operation because of a high or low system
refrigerant pressure event.
TABLE 3
Humidity Controls
Part Number
Predominate Features
8403-038
(H600A1014)
SPDT switching, pilot duty 50VA @ 24V;
Humidity range 20-80% RH
8403-047
(H200-10-21-10)
Electronic dehumidstat SPST closes-
on-rise; Humidity range 10-90% with
adjustable stops
TABLE 4
CO
2
Controllers
Part Number
Predominate Features
8403-056
CO
2
ventilation control with digital display.
Normally Open SPST (Default: Close at
800ppm)
8403-067
Normally Open SPST relay closes-on-rise
24V dual wave length sensor. Default setting
950ppm, adjustable to 0-2000ppm
Default off setting 1000ppm, adjustable to
0-200 ppm can be calibrated
TABLE 5
Thermostat Wire Size
Transformer
VA
FLA
Wire Gauge
Maximum Distance
In Feet
55
2.3
18 gauge
16 gauge
14 gauge
12 gauge
60
100
160
250