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.
Note: A Zone Sensor will not control Electric Heat.
Note: A Symbio Heat Pump Condenser does not have a 24 volt output for heat, if paired with a Legacy Air Handler you won't have a heat call in defrost.
Connections between Condenser and Air Handler
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Thermostat Wire – 3 Wires w/o electric heat, 5 wires with electric heat.
- Symbio Condenser Adapter Board J15-1 to LTB2-R in the air handler.
- Symbio Condenser Adapter Board J15-2 to LTB2-B1 in the air handler.
- Symbio Condenser Adapter Board J18-1 to LTB2-G in the air handler.
- Symbio Condenser UC J21-3 to Air Handler LTB2-W1.
- Symbio Condenser UC J21-5 to Air Handler LTB2-W2.
If the Air Handler has Electric Heat, be sure to configure the Symbio 700 UC for Primary Heating Source (Cooling Only), or Secondary Heating Source (Heat Pump) – Not Installed or you will get a Diagnostic for Indoor Options Module Comm Fail (The Symbio 700 will still turn the Indoor Fan on with a W1 call)
If using the EDC (Evaporator Defrost Control) thermostat in the legacy air handler:
- If not already done make wiring changes to the EDC switch as indicated on the Air Handler wiring diagram for Reliatel Controls.
- Using the Phone App go to Tools, Service, Customer Connection Polarity and change Demand Limit Input to Reversed.
- In Settings, Edit Configuration set Demand Management to Demand Limit and in Settings, Refrigeration set Cooling Demand Limit Capacity Enable Setpoint to 0%.
WARNING:
Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.
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