Carrier KFAIF0101HWC Interface Relay Kit Installation Guide
- June 16, 2024
- Carrier
Table of Contents
KFAIF0101HWC
Interface Relay Kit
Hydronic Heat for Communicating Fan Coils
Installation Instructions
NOTE: Read the entire instruction manual before starting the installation.
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service, maintenance, or use
can cause explosion, fire, electrical shock or other conditions which may
cause death, personal injury or property damage. Consult a qualified
installer, service agency, or your distributor or branch for information or
assistance. The qualified installer or agency must use factory-authorized kits
or accessories when modifying this product. Refer to the individual
instructions packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses, protective clothing and work
gloves. Use quenching cloths for brazing operations. Have fire extinguisher
available. Read these instructions thoroughly and follow all warnings or
cautions attached to the unit. Consult local building codes and the current
editions of the National Electrical Codes (NEC) NFPA 70.
In Canada, refer to the current editions of the Canadian Electrical Code CSA
C22.1.
Recognize safety information. This is the safety-alert symbol . When you see
this symbol on the unit and in instructions or manuals, be alert to the
potential for personal injury.
Understand the signal words DANGER, WARNING and CAUTION. These words are used
with the safety-alert symbol. DANGER identifies the most serious hazards which
will result in severe personal injury or death. WARNING signifies hazards
which could result in personal injury or death. CAUTION is used to identify
unsafe practices, which may result in minor personal injury or product and
property damage. NOTE is used to highlight suggestions which will result in
enhanced installation, reliability, or operation.
INTRODUCTION
Systems that include FCM4X 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 FCM4X fan coils with Hydronic Heat equipment.
NOTE: This kit will provide the necessary interface function when applied
with ION wall control SYST0101CW.
DESCRIPTION AND USAGE
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 nuts
- instructions
The wiring harness includes an ID device (270k resistor) 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:
Table 1 – Volt Load Ratings
30 A @ 120/277 VAC resistive
1.5 HP (10 A) @ 220/240 VAC
1.5 HP (5 A) @ 440/480 VAC
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
Before installing, modifying or servicing system, always turn off main power
to system. There may be more than one disconnect switch. Lock out and tag
switch with a suitable warning label.
CAUTION
Failure to follow this caution may result in personal injury. Sheet metal
parts may have sharp edges or burrs. Use care and wear appropriate protective
clothing and gloves when handling parts.
INSTALLATION
-
Turn off all electrical supply to the fan coil and the Hydronic equipment.
-
Remove fan coil upper door.
-
Unplug and discard the factory provided power harness that is connected to the 12-pin heater control connector.
-
Remove the blank plate that is installed over the heater installation opening.
-
Punch or drill two 1/8” (3.175 mm) diameter holes in the center of the blank plate, 2-3/8” (60.325 mm) apart (Fig. 1).
-
Mount the relay using 2 sheet metal screws.
-
Replace the heater blank plate with the relay mounted to it in its original location.
-
Connect the 12-pin plug to the heater control connector.
-
Use wire nuts to connect stripped red leads to the incoming Hydronic equipment control power wires (Fig. 2).
-
Use field supplied wire nuts to connect the stripped black and yellow leads to the fan coil 240VAC power supply connection.
IMPORTANT: IMPORTANT: Be sure to consult local building codes and the National Electrical Code (NEC) for special requirements. -
Reinstall the upper door.
-
Turn on electrical supply to both fan coil and Hydronic equipment.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
© 2023 Carrier. All rights reserved.
A Carrier Company
Edition Date: 03/23
Catalog No: AG-KFAIF-02
Replaces: AG-KFAIF-01
Documents / Resources
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