6.CHECK FAN OPERATION
1.Turn on the fan (set to ON).
•The thermostat G terminal will energize and the system blower will start. The Fan Status on the display will show “FAN ON.”
2.If an ADHC has been installed, allow the fan to operate for no less than 40 seconds. If an ADHC is not part of this installation, you can turn the fan off at any time. A humidity value can be displayed only after at least 40 seconds of blower
3.Turn the fan off (set to AUTO).
7.VERIFY ADHC CONNECTION (if optional Automatic Digital Humidifier Control installed).
1.Ensure that the ADHC has power (the green status light on the ADHC should be on) and make sure the ADHC is functioning properly – see ADHC installation procedure for start up and diagnostics.
2.From the Main Screen, press the “INFO” button.
•The outdoor temperature and relative humidity will be displayed for five seconds after which the contact screen will be displayed.
3.Press the BACK button to return to the Main Screen.
•When the humidifier is operating, the message “HUMIDIFIER ON” appears at the message center, alternating with the time and date and any other currently active messages.
TROUBLESHOOTING – ADHC CONNECTION
Symptom | Cause |
|
|
| Miswiring – Check wire colors to verify A at ADHC is connected to ZA at |
| thermostat and B is connected to ZB. |
No RH display, no outdoor | ADHC power source – When wired to the Model 8570 thermostat, the ADHC |
temperature display | must be wired to a continuously ON power source. Use voltmeter to verify |
| presence of 24VAC (nominal) at ADHC. |
|
|
| ADHC not operating correctly – check red diagnostic light on ADHC. |
|
|
No RH display, outdoor temperature OK | No valid reading available – run fan for at least 40 seconds. |
|
|
RH display, outdoor temperature @ 20°F | ADHC set for manual mode of operation. Wire an outdoor sensor to the |
| ADHC or wire an outdoor sensor to the thermostat. |
|
|
No display, weak text in display, | Readjust contrast of display to an optimum level. See “Adjust Contrast” |
or too dark of a display | Section 7.8 in the Owner’s Manual. |
|
|
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