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Symbio Condenser (Cooling or Heat Pump) with Legacy CV Air Handler
Wire the thermostat to the Symbio 700 J21 except for R and C, wire thermostat R to Symbio Adapter Board
J15-1, wire thermostat C to Symbio Adapter Board J15-2.
Connections between Condenser and Air Handler
1. Thermostat Wire – 3 Wires w/o electric heat, 5 wires with electric heat.
a. Symbio Condenser Adapter Board J15-1 to LTB2-R in the air handler.
b. Symbio Condenser Adapter Board J15-2 to LTB2-B1 in the air handler.
c. Symbio Condenser Adapter Board J18-1 to LTB2-G in the air handler.
d. Symbio Condenser UC J21-3 to Air Handler LTB2-W1.
e. Symbio Condenser UC J21-5 to Air Handler LTB2-W2.
2. Symbio configuration - When connecting a room thermostat or zone controller to the Symbio Condenser,
ensure that the Symbio 700 Unit Controller configuration has been set for the appropriate device,
Conventional TStat, Single Setpoint Zone Sensor or Dual Setpoint Zone Sensor.
Note: A Zone Sensor will not control Electric Heat.
Primary Heating Source: If the Air Handler has Electric Heat, be sure to configure the Symbio 700 UC for
Primary Heating Source – Not Installed or you will get a Diagnostic for Options Module Comm Fail (The
Symbio 700 will still turn the Indoor Fan on with a W1 call)
3. If using the EDC (Evaporator Defrost Control) thermostat in the legacy air handler, it will be necessary to
add a 24VAC relay with Normally Closed contacts to change the action of the EDC from N.C. to N.O. for
connection to the Symbio 700 in the condenser as shown below.
a. Move wire W12(BL) to one side of the coil of the field supplied 24VAC relay (R).
b. Move wire W11(Y) from to LTB2-R.
c. Add field wire between other side of relay coil and LTB2-B1.
d. Connect normally closed relay contact to Symbio Condenser (UC) J16-1 & 2.
e. In Edit Configuration set Demand Management to Demand Limit and in Settings, Refrigeration
set Cooling Demand Limit Capacity Enable Setpoint to 0%
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