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Made in Rome, New York, USA
6
COOLING ONLY UNITS
With or Without Heat
Depending on the thermostat required or selected,
cooling only air handles may utilize four to six
low Volt
interconnecting wires between the indoor unit, thermostat
and outdoor unit. Some thermostats do not require the use
of the “C” (brown) connection. In this case, ensure that
any unused wires are insulated with a wire nut to prevent
them from making contact with the junction box or other
metal surfaces.
If the indoor unit has electric heat or hydronic heat then
a “W” connection is required between the thermostat and
indoor unit.
Refer to low Volt interconnect diagram interconnect diagram
Figure 2
for remote wall thermostat controls
HEAT PUMP CONNECTION - REMOTE THERMOSTAT
Two-stage Heating
Since heat pump mode is a function of the thermostat and
outdoor unit, connections between the indoor unit and
thermostat are the same as for cooling only applications.
Depending on the thermostat required or selected, the air
handler may utilize four to six
low Volt
interconnecting
wires between the indoor unit, thermostat and outdoor
unit. Some thermostats do not require the use of the “C”
(brown) connection.
Heat pump operation requires the connection of the “O”
(orange) terminal from the outdoor unit to the thermostat.
The reversing valve is energized in the cooling mode for
EMI models SHC heat pump condensers. If the indoor unit
has an electric heater then a “W” connection is also required
between the condenser and the indoor unit. For two-stage
heating, a “W” (sometimes called “W2”) connection is also
requires at the thermostat. Refer to the instructions provided
with the thermostat for the proper thermostat connections
for a two stage heat, single stage cooling system.
Ensure that any unused wires are insulated with a wire
nut to prevent contact with the junction box or other metal
surfaces.
LOW VOLT INTERCONNECT WIRING
Continued
NOTE:
Two-stage heating requires the combination
of a heat pump condenser and an indoor unit that
is equipped with an electric strip heater. The indoor
electric heater will energize as the second stage
heat source (the temperature is dependent on the
thermostat selected) and also during the defrost mode
for models SHC. For limited range heat pumps models
MH2 and MH4, heat pump operation will cease when
the outdoor temperature falls below 35°F. In this case
the electric strip heater will remain sole heat source.
Refer to low Volt interconnect diagram interconnect diagram
Figure 2
for remote wall thermostat control.
Figure 2
Figure 2 A
COMMON TO ALL AIR HANDLERS
Continued
