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KFAIF0101HWC - Hydronic Relay Interface Kit (FE4A FE5A Fan Coils)

Item: KFAIF0101HWC

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About This Product

Product Info


Systems that include FE4 and FE5 fan coils do not use 24VAC signals to communicate system operation commands. System control is accomplished through computer level commands on a system “bus” that requires fewer low voltage interconnecting wiring. System components that are not capable of communication through this bus require an interface kit. This kit provides interface of the FE4 and FE5 fan coils with Hydronic Heat equipment.
NOTE: This kit will provide the necessary interface function when applied with User Interface -B version, or later, and FE4/5AN fan coils that are equipped with fan coil control HK38EA011 or HK38EA012. Fan coil control HK38EA011 is factory-installed in FE fan coils with minor revision B, or later, in the 14th digit of the fan coil model number. Electric heat cannot be used with Hydronic Interface Relay Kit.

The Interface Relay Kit consists of:
  • a 22 VDC relay fitted with a rectifier circuit board that can be mounted within the fan coil
  • a wiring harness that is pre-wired to the relay and terminated with a 12-pin AMP Mate-N-Lok plug that connects to the fan coil’s heater control connector
  • two No. 16 AWG stripped leads for connecting the relay normally open contacts into the Hydronic system control circuit
  • two mounting screws
  • two wire connectors
  • instructions
The wiring harness includes an ID device that is recognized by the fan coil control as assigned to Hydronic Heat equipment. The relay provides switching control of the Hydronic equipment through its normally open contacts. Refer to the User Interface literature for further configuration information.
NOTE: The relay provided with this kit may not be suitable for use with electronic control inputs using very low level current. Review the Hydronic equipment control power requirements prior to use of this kit. The minimum load rating for reliable switching of the relay contacts is 500 mA at 12VAC/VDC, additional loading may be required.
The maximum relay ratings are:
30 A @ 120/277VAC resistive
1.5 HP (10 A) @ 220/240VAC
1.5 HP (5 A) @ 440/480VAC
Warning: this product contains a chemical known to the State of California to cause cancer.


Weight1 Pounds (lbs)
Width5 Inches (In)
Height3 Inches (In)
Country of OriginUSA
Length5 Inches (In)
Prop 65Yes



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