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18-GL07D1-4
2GN SPLIT INSTALLER’S GUIDE
Figure 1: Typical Split System Application with TAMG Air Handler
Dual Fuel Systems
2GN Series units can be connected to fossil fuel furnaces that
include an A-coil or slab coil. Dual fuel installations utilize the
2GN Series heat pump for heating until the point that auxiliary
heat is called for on the thermostat. At that point, the furnace
will be enabled and the heat pump will be disabled. The
2GN Series heat pump provides air conditioning through the
furnace’s refrigerant coils.
Refer to the furnace manufacturer’s installation manual for
the furnace installation, wiring and coil insertion. A dual fuel
thermostat, a fi eld-installed DPST relay or dual capacity
auxiliary heat relay is required. See Figure 2 for typical Dual
Fuel application.
In add-on 2GN Series Split applications, the coil should be
located in the supply side of the furnace to avoid condensation
damage to the furnace heat exchanger. A high temperature
limit should be installed upstream of the coil to de-energize the
compressor whenever the furnace is operating. Without this
switch, the 2GN Series Split will trip out on high pressure. A
dual fuel thermostat can remove the Y1 and Y2 calls when a W
call is energized to allow gas furnace backup on a 2GN Series
Split application. Refer to thermostat wiring diagram for details.
Disconnect
Thermostat
Wire From Furnace
Vibration Absorbing Pad or Air Pad
P/T Plugs
Wire To
Thermostat
Up-Flow
Fossil Fuel
Furnace
Condensate
Drain
"A" or
Slab Coil
Supply Duct
Air Temperature Limit Switch -
prevents compressor operation when
entering air is greater than 90°F.
Water Out
Water In
Lineset To Air Handler
Insulated
Suction Line
DHW In
Return
Duct
DHW Out
Maximum Recommended Distance
is 60' Between Units
Figure 2: Typical Split System Heat Pump Coil Add-On Fossil Fuel Furnace
Disconnect
Thermostat Wire
From Air Handler
Vibration Absorbing Pad or Air Pad
P/T Plugs
Water Out
Water In
Lineset To
Air
Handler
Insulated Suction Line
Supply
Duct
Wire To
Thermostat
Return
Duct
Condensate Drain
To Drain
Remote Air Handler
(Maximum Recommended Distance is
60' Between Units)
DHW In
DHW Out
Summary of Contents for 2GN Series
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