Assessments - 3, GPA: 4.3
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2. Wire the connector board to the Apollo control with a short piece of field-supplied 5-conductor cable. 3. Plug the thermostat into the connector board. a. If thermostat powers up, there is a wiring problem. Find the open or shorted wire, or replace the wiring between the thermostat and the Apollo control. b. If the thermostat does not power up, try another thermostat. If the new thermostat powers up, replace the off thermostat. If the new thermostat will not power up, replace the Apollo control. The Control Will Not Energize Heating 1. The thermostat is not displaying the heat indicator: a. Check the heating lockout temperature set point and options to make sure the outdoor-air temperature is locking out Heating mode. b. Ensure that a sensor in the system is not reading above the heating high limit temperature. If a supply air sensor or a direct expansion (DX) coil sensor is not connected to the Apollo control, turn off the High and Low Limits option at the thermostat. c. Check the Heat switch and make sure it is in the AUTO. position. 2. The thermostat is displaying the heat indicator. a. Check to see if the H1 LED (light-emitting diode) is lit on the Apollo control. If it is not, replace the Apollo control. If the H1 LED is lit on the Apollo control, check the voltage across the H1 relay contact. If it reads 24 vac, replace the Apollo control. If it reads 0 to 2 vac, check the H1 contactor and the unit transformer. The Control Will Not Energize Second Stage Heating 1. The thermostat is not displaying the second stage indicator. A decimal point on the thermostat display screen is the indication that the thermostat is asking for second stage. a. Check to see if the space demand is equal to or greater than 2° F. The control must see a 2° F demand before it will call for second stage. b. Check the Temperature Trend Staging option. If this option is configured to “on” and space conditions are improving, the control will not energize the second stage. 2. The thermostat is displaying the decimal point. a. Check to see if the H2 LED is lit on the Apollo control. If it is not lit, replace the Apollo control. b. The LED is lit, but second stage is not energized. Check the voltage across the H2 relay contact. If it reads 24 vac, replace the relay board. If it reads 0 to 2 vac, check the H2 contactor and the unit transformer. The Control Will Not Energize Cooling 1. The thermostat is not displaying the cool indicator. a. Check the cooling lockout temperature set point and options to make sure the outdoor-air temperature is not locking out Cooling mode. b. Ensure that a sensor in the system is not reading below the cooling low limit temperature. If a supply air sensor or a direct expansion (DX) coil sensor is not connected to the relay pack, turn off High and Low Limits at the thermostat. c. Check the Cool switch and make sure it is in the AUTO. position. 2. The thermostat is displaying the cool indicator. a. Check to see if the C1 LED is lit on the Apollo control. If it is not, replace the Apollo control. If the C1 LED is lit on the Apollo control, check the voltage across the C1 relay contact...
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