FAQ
What is the difference between Off Setback (OSB) and Idle modes?
In OSB mode, the fan will idle for a set number of degrees below the set point; it will be off below that. In Idle mode, the fan will always idle below the set point, no matter how low the temperature goes.
What are the dimensions of the FC-1T-1VAC-1F
The enclosure is 4.75 x 7.80 x 3.75 in. (12 x 15.6 x 9.5 cm) The switch and knob add an additional 0.75 in. (1.9 cm) to the depth.
Does the FC-1T-1VAC-1F have a manual override?
No.
Can the FC-1T-1VAC-1F control fixed speed fans?
No, the fixed stage is for a heater only. The FC-1T-1F controls fixed-speed fans.
Can the FC-1T-1VAC-1F be set up to have the fan continually running?
Yes, by using Idle mode. See the user manual for more information.
Is this a replacement for the FHC-1D or the VTC-1D?
Yes, it is a direct replacement for the FHC-1D. It also replaces the VTC-1D, the difference being the addition of the heater interlock feature.
How do I ensure my fan never turns off?
First adjust the OSB trimmer all the way clockwise to ensure it's set to IDLE. Then, if it still shuts off, it's because your idle speed is not high enough. Increase this setting, to ensure fan spins instead of just humming.
Troubleshooting - Variable fan runs at maximum
Problem Variable fan runs at maximum Possible Cause Possible Solution Incorrect wiring Correct the wiring. The fuse is open or blown. Check why the fuse was blown and repair any problems. Replace the fuse. The variable stage is configured as OFF ...
Troubleshooting - Display showing unusually high or low temperature
Problem Display showing unusually high or low temperature Possible Cause Possible Solution If you have more than one probe connected, press buttons 1 to 4 to determine which probe is causing the high or low reading. The probe is not a Phason probe. ...
Troubleshooting - Variable speed 1 or variable speed 2 fan switches on, runs at full speed, and then turns off. Keeps cycling.
Problem Variable speed 1 or variable speed 2 fan switches on, runs at full speed, and then turns off. Keeps cycling. Possible Cause Hysteresis not high enough. Outside temperature rising and falling quickly. Happens most often in the spring and fall. ...
Troubleshooting - Variable fan or variable heat element not running
Problem Variable fan or variable heat element not running Possible Cause Possible Solution Incorrect wiring Correct the wiring. Fuse open or blown Check why the fuse was blown and repair any problems. Replace the fuse. Minimum Idle setting too low ...
Troubleshooting - Variable fan or variable heat element runs at maximum.
Problem Variable fan or variable heat element runs at maximum. Possible Cause Possible Solution Incorrect wiring Correct the wiring. Minimum idle speed too high Decrease the mimimum idle speed setting. Variable speed range matches temperature set ...
Troubleshooting - Relay not operating load
Problem Relay not operating load Possible Cause Possible Solution Incorrect wiring Correct the wiring. Switch-on setting for stage incorrect Adjust the setting. Relay set to cool for a heater Relay set to heat for a fan No power to load Switch on the ...
Troubleshooting - Motors and fans slow down or stop
Problem Motors and fans slow down or stop Possible Cause Power surge, brownout, or power outage Possible solution You cannot do anything when it happens, but could avoid problem in future by providing proper voltage and/or protection to the unit.
Troubleshooting - No power and/or display
Problem No power and/or display Possible Cause Possible Solution A circuit breaker at service panel is off or tripped. Reset the circuit breaker. Incorrect wiring Correct the wiring. Display board inter-connect cable is not plugged into the power ...
Troubleshooting - Burn marks on boards and components
Problem Burn marks on boards and components Possible Cause Power surge, brownout, or power outage Possible solution You cannot do anything when it happens, but could avoid problem in future by providing proper voltage and/or protection to the unit.
Troubleshooting - Power supply Components blown out
Problem Power supply components blown out Possible Cause Power surge, brownout, or power outage Possible solution You cannot do anything when it happens, but could avoid problem in future by providing proper voltage and/or protection to the unit.
Alarm Codes and Error Messages
ALARM MESSAGE POSSIBLE CAUSE POSSIBLE SOLUTION Power Fail Alarm There has been a power failure. Check to see why the power failed and then fix the problem. The temperature probe or sensor cable has short circuited. The temperature probe is damaged or ...