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Phason 

FHC-1D user manual 

11140706  

 

 

FHC-1D user manual 

The Fan and Heater Control (FHC-1D) automatically controls the temperature in a room by 
adjusting the speed of variable speed fans and controlling a heater interlock.  

When the temperature is at the set point, the FHC-1D operates the fans at the idle speed setting and 
the heater is off. When the temperature exceeds the set point, the FHC-1D increases the speed of 
the fans. When the temperature drops below the set point, the FHC-1D shuts off the fans (in shut-
off mode) or operates the fans at idle speed (idle mode) and switches on the heater or heat lamps. 

 

 

Features 

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One variable speed output 

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One heater interlock output 

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Automatic shut-off and idle modes 

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Adjustable off set-back for shut-off mode  

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Adjustable idle speed for idle mode 

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Adjustable temperature set point 

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Adjustable temperature differential  

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Three-second full-power-turn-on to 
minimize fan ice-up 

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Two-digit LED display 

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Fahrenheit and Celsius display 

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Error code display for troubleshooting 

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Overload protection fuse 

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Six-foot temperature probe, extendable to 500 feet 

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Rugged enclosure (corrosion resistant, water resistant, and fire retardant) 

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CSA approval 

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Two-year limited warranty 

 

Summary of Contents for FHC-1D

Page 1: ...f the fans in shut off mode or operates the fans at idle speed idle mode and switches on the heater or heat lamps Features One variable speed output One heater interlock output Automatic shut off and...

Page 2: ...360 W tungsten at 120 VAC The FLA full load ampere rating accounts for the increase in motor current draw when the motor operates at less than full speed Make sure the motor equipment connected to the...

Page 3: ...lectrical knockouts for bringing wires or cables into or out of the enclosures Use watertight strain reliefs or conduit connectors at all cable entry points Do not make additional holes in the enclosu...

Page 4: ...us you want to use 3 Connect the wires as shown below Connecting equipment to the heater interlock The heater interlock output is a normally open relay contact that switches a heater or furnace ON or...

Page 5: ...un the sensor cable beside AC power cables or near electrical equipment When crossing other cables or power lines cross them at a 90 degree angle Using four zone averaging The FHC 1D can monitor the t...

Page 6: ...ension cable to the temperature probe cable as shown on the next page If the unit operates erratically with the extended probe run the cable along a different path or shorten it To extend probe cables...

Page 7: ...ch to the right The control is now in normal mode Display alerts Alert Description P S The temperature probe or sensor cable has short circuited P D The temperature probe is damaged or the connecting...

Page 8: ...ht Parameter Code Range Factory setting Location Temperature set point N A 32 to 99 F 0 to 38 C N A External knob Idle speed id 0 99 N A External knob Temperature differential di 1 to 20 F 0 6 to 12 C...

Page 9: ...ion in OSB mode There must be a temperature probe connected before adjusting the minimum ventilation 1 Turn the Idle Speed knob fully counter clockwise and then back turn clockwise 2 Click the front c...

Page 10: ...e of maximum speed For more information see Operation description on page 13 To display and adjust IDLE 1 Click the switch to the right to start at the beginning of the parameter list 2 Click the swit...

Page 11: ...ormula below to calculate the correct DIFF setting Power factor 1 0 0 9 0 8 0 7 0 6 0 5 Correction F 1 00 1 05 1 10 1 25 1 33 1 60 actual differential desired differential correction Example 1 To have...

Page 12: ...rrection 10 F T2 T1 Example 3 For a T1 temperature of 75 F and a T2 temperature of 82 F the correction is 1 43 10 F 82 F 75 F 1 43 If the desired differential is 5 F the actual differential can be cal...

Page 13: ...tes at full speed for three seconds then IDLE minimum ventilation of 20 The fan will continue to IDLE between 75 F and 80 F 3 At 78 F the heater interlock shuts off 4 Between 80 F and 86 F DIFF the fa...

Page 14: ...E 20 of maximum ventilation when the temperature is below 80 F 3 Between 80 F and 86 F DIFF the fan speed changes proportionally with the temperature If the temperature increases fan speed increases I...

Page 15: ...t that is labelled as non corrosive electronics grade or neutral cure such as GE Silicone RTV6780B RTV 142 or RTV 162 Do not use a sealant that is labelled as acetic acid cure or acetoxy cure These se...

Page 16: ...ide proof of purchase upon request All transportation charges for products submitted for warranty must be paid by the purchaser Except to the extent prohibited by applicable law no other warranties wh...

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