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® 2018 Valco Companies, Inc.
This item is for timed fans. Input the number of hours, minutes and seconds (up to nine hours) you want the fan
group to run when in a timed mode. Then, input the number of hours, minutes and seconds (up to nine hours) you
want the fan group to remain off after the ON Timer is complete.
VARI - TUNNEL FAN GROUP #1 SETTING Z1-S01
Run Mode: Temp and Timed
VARI -
TUNNEL FAN GROUP #1 SETTING Z1-S01
ON Timer:
OFF Timer:
The graph below shows how the fan power automatically adjusts as the building temperature rises from 70 degrees to
95 degrees and falls back to 70 degrees again.
Stir, Sidewall, Tunnel, Pit and Ridge Fan Settings - continued
Power Ramping Example
Observe that fan power stays at zero until the ON Temp is reached. As temperature falls the power stays at the Fan
ON Power setting until the OFF Temp is reached.
Each fan can operate in one of five different run modes. The ON/OFF temperature descriptions below assume “cool”
fans. Reverse the description for “heat” fans.
Temp Only
– The fan runs when the temperature is at or above the ON temperature. The fan turns off when the
temperature is at or below the OFF temperature.
Timed Only
– The fan cycles on and off continuously based on the ON and OFF times you input.
Temp or Timed
– The fan runs according to temperature control when the temperature is at or above the ON setting.
The fan runs according to timed setting when the temperature drops back to or below the OFF setting.
Temp and Timed
– The fan runs according to the timed settings when the temperature is at or above the ON setting.
When the temperature drops back to or below the OFF setting, the fan does not operate.
Temp or Minimum Ventilation
– The fan runs according to temperature control when the temperature is at or above
the ON setting. The fan runs according to the minimum ventilation times (entered in the Minimum Ventilation and
Purge Settings menu) when the temperature drops back to or below the OFF setting. This mode does not appear
when only stir fans are being used.
Fan Run Mode: Temp Only
ON Temp:
80 degrees
Fan ON Power Setting: 30
OFF Temp:
75 degrees
Power Ramping Start Temp: 85 degrees
Full Power Temp:
90 degrees
Full Power Setting: 50
0
10
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30
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70
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95
90
POWER RAMPING EXAMPLE
POWER LEVEL
Temperature Over Time
Po
w
er Le
vel
Fan Run Mode
Fan On and Off Timers