Assessments - 3, GPA: 3.7 ( )

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The second stage of heating will energize when the demand becomes 2.0° F or greater. OFF Heating Mode — When the Heat switch is set to OFF position, the Apollo control will not allow the rooftop unit to energize heating. AUTO. Cooling Mode — When the Cool switch is set to AUTO. position, the Apollo control will energize cooling when the cooling demand is 1.5° F or greater. The second stage of cooling will energize when the demand becomes 2.0° F or greater. OFF Cooling Mode — When the Cool switch is set to OFF position, the Apollo control will not allow the rooftop unit to energize cooling. Temperature Trend Staging — When the Temperature Trend Staging option has been configured at the thermostat, the thermostat tracks the temperatures at regular intervals in each cooling or heating mode. As long as the space temperature is improving, the Apollo control will not allow the second stage to be energized. If the space temperature stays the same or the demand becomes greater, the second stage will energize. Heating Lockout — When the heating lockout temperature set point has been configured, and the heating lockout option has been configured to ON, the Apollo control will not allow heating to energize when the outdoor-air temperature rises above the heating lockout set point. Cooling Lockout — When the cooling lockout temperature set point has been configured, and the cooling lockout option has been configured to ON, the Apollo control will not allow cooling to energize when the outdoor-air temperature drops below the cooling lockout set point. Time-Delay Relay — The thermostat and the Apollo control utilize a 5-minute time delay between the different modes of operation for the rooftop unit. When a mode of operation is deenergized, another mode cannot begin for 5 minutes. 3 NOTE: Refer to Product Support Bulletin No. 93-005 for shielded wire applications when wiring the thermostat to the Apollo control and for all communication bus wiring connections or contact your local representative. Fig. 6 — Thermostat and Apollo Control Wiring 4 TROUBLESHOOTING See Fig. 7-10 for Apollo factory, control, and system wiring. Blank Display or Blinking Display at the Thermostat 1. Check to ensure there is at least 20.5 vac across the 2 terminals labelled 24 vac. If there is not at least 20.5 vac, check the unit transformer which is powering the Apollo control. 2. If an ac voltage between 20.5 and 30 vac is read, check for 10 vdc between the terminals labelled WHT and RED. If there is 0 vdc between the terminals, replace the Apollo control. If a value between 1 and 10 vdc is read, check the wiring between the thermostat and the Apollo control. 3. If the thermostat display is blinking on and off, this is an indication that there is a communication problem between the thermostat and the Apollo control. The thermostat and the Apollo control communicate on the blue and yellow wires. If either one is shorted, open, or crossed, it will cause the thermostat display to blink. To check the wiring between the thermostat and the Apollo control: 1. Remove the thermostat and connector board. 2. Wire the connector board to...

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