King KRF-24V-KIT: Wireless 24V RF Thermostat System

Smart Heating Solutions

Product Overview

The King KRF-24V-KIT is a 24-Volt RF wireless thermostat platform designed for a wide range of 24V HVAC systems. It is ideal for applications where wiring is limited, wires are broken, or for adding features like an add-on heat pump or multi-stage system without running new wires. The kit includes a 7-day programmable thermostat (KRFTP-B) that communicates wirelessly with a 24V relay (KRFR-24V) wired to the HVAC unit.

The system offers enhanced flexibility with optional RF sensors for occupancy, window/door status, and master control, allowing for optimized energy usage and comfort.

Key Features

Kit includes KRFTP-B RF 24V Thermostat and KRFR-24V 24V RF HVAC Relay.
Wireless Two-way RF communication operating at 915 MHz.
Supports 24V HVAC control for Heating & Cooling.
Features a 7-day programmable schedule.
Operating Modes: Auto, Cool, Fan Only, Off, Heat.
Temperature Range: 44°F to 90°F (7°C to 32°C).
Accuracy: ± 1°F.
Includes Optimal Start/Stop and Keypad Lockout features.
Maximum cooling & heat temperature limits set between 44°F and 90°F.
Optional RF sensors can limit operation based on room activity or open windows/doors.
Comes with a 2 Year Limited Warranty.

System Diagram Description

The system diagram illustrates the wireless connection between the KRFTP-B thermostat and the KRFR-24V HVAC relay. The KRFTP-B thermostat, powered by 24V DC or AA batteries ?, communicates wirelessly via RF 915 MHz ? to the KRFR-24V relay. The KRFR-24V relay is connected to the Heat Pump or Conventional HVAC System and receives 24V DC power. Optional RF accessories can be integrated into the system to enhance functionality.

Optional RF Accessories:

KRF-PIR-SENSOR: RF Battery-powered Occupancy PIR Sensor for automatic temperature setback when a room is unoccupied. Setback Options: (44°F - 65°F). [motion sensor]
KRF-WINDOW-SENSOR: RF Battery-powered Window/Door Sensor for automatic temperature setback when a window or door is left open. Setback Options: (44°F - 65°F). [door/window sensor]
KRF-MASTER-SWITCH: RF Battery-powered Master Setback Switch allows manual setback of all paired systems upon exiting a building. Setback Options: (44°F - 65°F). [master switch]
KRF-REPEATER: 5V USB-C Powered RF Signal Amplifier designed to extend the range of wireless transmission. [signal repeater]

Engineering Specifications

KRFR-24V RF Thermostat Kit Specifications:

Supply Voltage:	24V, 50-60Hz
Rating:	0.5A
Wireless Operation:	RF Connect Button
Working Frequency:	915 MHz
Heat Pump Control:	Heating and Cooling
Touch Screen:	Touch Sensitive
Temperature Display Range:	0°F to 95°F (-17°C to 35°C)
Temperature Control Range:	44°F to 90°F (7°C to 32°C)
Display Accuracy:	± 1°F
Optimal Start/Stop:	Ensures set temperature is reached at scheduled time; Optimal Stop shuts down system early upon PROG transition for energy savings.
Deadband:	Adjustable 4 to 6 Degrees (Default 5)
Differential:	Adjustable from 0.5°F to 2.0°F (Default 1°F)
2nd Stage Offset:	Adjustable from 2°F to 5°F (Default 3°F)
Heat Schedule Options:	5+2 / 5+1+1 / 7-Day (Default: 5+2)

KRFR-24V HVAC Relay Specifications:

Input Rating:	24Vac/24Vdc, 2A
Wireless Connect:	RF Connect Button
Communication:	Two-way
Working Frequency:	915 MHz
Working Distance:	30 Meters (98.5 feet)
Dimension:	1204028 mm

Ordering Information

Complete Kit:

MODEL	UPC	DESCRIPTION
KRF-24V-KIT	70426	RF Thermostat Kit, w/ KRFTP-B Programmable BP Thermostat, KRFR-24V HVAC Relay

Order A'la Carte:

MODEL	UPC	DESCRIPTION
KRFTP-B	70134	Programmable Battery Powered Multi-System RF Thermostat
KRFR-24V	70136	24V HVAC Relay, 24VAC/VDC, 2A

Optional Accessories:

MODEL	UPC	DESCRIPTION
KRF-PIR-SENSOR	70152	PIR Sensor, Battery Powered, For KRFTP Thermostat
KRF-REPEATER	70154	RF Repeater, USB Powered, For KRFTP Thermostat
KRF-WINDOW-SENSOR	70155	Window/Door Sensor, Battery Powered, For KRFTP Thermostat
KRF-MASTERSWITCH	70156	Master Switch, Battery Powered, For KRFTP Thermostat

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