Equipment:
Terminal Equipment like Blower Coils with CSTI control board
Odyssey R454B TTA Condenser
Low Voltage Wiring:
Notes:
- All controls relays are field provided. Keep 24VAC sources isolated (Symbio 400B and Symbio 700). Failure to do this could result in equipment damage.
- If air handler unit is equipped with electric heat, thermostat will control stages through W1 and W2 signals.
- Do not exceed P21, 24VAC OUT terminal, max current draw 75 mA.
- Control relays total electrical load powered from the Symbio 700 (coil side), not to exceed 17 VA.
Symbio 700 Configuration
- System Type: CVZT
- Indoor Fan Type: When connecting the Symbioâ„¢ condenser to a Terminal air handler with a control interface board and either equipped with VFD or motor starter, confirm that the Symbio 700 Controller indoor fan type configuration is set to Single Speed selection
- Primary Heating Source: If the air handler is equipped with electric heat, configure the Symbio 700 Controller for primary heating source to Not Installed, otherwise a Diagnostic for Options Module Comm Fail will be active. The Symbio 700 will still turn the indoor fan on with a W1 call.
Air Handler to Condenser Connections
Control Wire - Thermostat wire, up to five conductors
Table: Pairing air handler to condenser wiring
Cond | Required/Optional | Air Handler Connection | Condenser Connection | Purpose | Detail |
1 | Required | -- | AB J15-2 | Ground | Isolation Relay Common |
2 | Required | R-SF Coil | AB J18-1 | Supply Fan |
|
3 | Optional | R-EH1 | UC J21-3 | W1 | Electric Heat Stage 1 (Only when Electric Heat is Installed) |
4 | Optional | R-EH2 | UC J21-4 | W2 | Electric Heat Stage 2 (Only when Electric Heat is Installed) |
5 | Required | TB3-9 | TB-T1 | A2L Alarm | A2L Alarm Indication (Compressor Disable) |
6 | Required | TB3-8 | TB-T2 | A2L Alarm | A2L Alarm Indication (Compressor Disable) |