8. CHECK HEATING OPERATION
Notes:
•To avoid the minimum on and off times during system checkout, always start and end the check out procedure in the OFF mode.
•Do not operate heat pumps in the heating mode at high outdoor temperatures for extended periods of time.
1. Set the thermostat to the OFF mode.
2.Set the thermostat to the HEAT mode.
•With the O/B configuration setting in the B position (ON), the O/B terminal will be on in the Heat mode. In the O position (OFF), the O/B terminal will not be on in the Heat mode.
3.Raise the temperature setting above the room temperature to activate the desired stages of heating. The mode display will change from “HEAT MODE” to “HEATING”, which will flash, when the thermostat is calling for heat. Fifteen (15) seconds must elapse between each stage. Verify the correct outputs are on according to the configuration settings shown below:
TROUBLESHOOTING – HEATING OPERATION
Symptom | Cause | |
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| |
Thermostat does not call for heat | ||
HEAT and make a call for heat. | ||
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| |
Heating does not come on at all | RH terminal not connected – see wiring diagrams. | |
| ||
Heating equipment power not on. | ||
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| High Balance point limit – set balance point to OFF during system checkout. | |
Auxiliary Heat does not come on |
| |
Number of Auxiliary Heat stages not set correctly. See Step 4 of Thermostat | ||
| Start Up (page 27). |
| Single/Multi | Multi | Multi | Single | Single | Multi | Multi | Single | Single | ||||
Configuration | HP/HC | HC | HC | HC | HC | HP | HP |
| HP |
| HP | ||
Settings | Elect/Gas | Elect | Gas | Elect | Gas | Elect | Gas |
| Elect |
| Gas | ||
| Aux. Ht. Stages |
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| 1 |
| 2 | 1 |
| 2 |
| 1st Stage Heat | W1 | W1 | W1 | W1 | Y1 | Y1 | Y1 |
| Y1 | Y1 |
| Y1 |
| G |
| G |
| G | G | G |
| G | G |
| G | |
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| W1 | W1 | W1 | W1 | Y1 | Y1 | Y1 |
| Y1 | W1 |
| W1 |
Outputs | 2nd Stage Heat | W2 | W2 | W2 | W2 | Y2 | Y2 | W1 |
| W1 |
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|
| G |
| G |
| G | G | G |
| G |
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| |
Energized |
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| Y1 |
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| Y1 |
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| W1 | |
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| 3rd Stage Heat |
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| Y2 |
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| W1 |
|
| W2 |
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| W1 | W1 |
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| W2 |
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| G | G |
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| G |
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| Furnace plenum sensor keeps fan on – normal. | |
Fan stays on after heat call | Blower Extension for humidifier operation. Verify that the message | |
"HUMIDIFYING" appears at the message center, alternating with the time | ||
| ||
| and date and any other currently active messages. | |
|
| |
Fan comes on before heat starts, or | Change position of ELECT/GAS dip switch – ELECT for electric heat systems | |
(fan on with heat call) or to GAS for fossil fuel systems where the fan is | ||
Fan does not come on with heat | ||
controlled internally by the heating equipment. | ||
| ||
Cooling comes on instead of heat | O/B dip switch not set properly. See Step 2, page 30. | |
| ||
Miswiring – check wire colors at thermostat and HVAC equipment. | ||
| ||
Takes longer than 15 seconds for auxiliary | SINGLE/MULTI dip switch set incorrectly – set to SINGLE for | |
heat to come on after compressor heat. | compressor systems. |
- 30 - | - 31 - |
