Product Overview
The King KRF-HEAT-KIT is a 24-volt RF wireless thermostat platform designed to control electric resistance heaters, including both fan-driven and baseboard models. It simplifies installation by eliminating the need to run new wires through walls.
The kit comprises a 7-day programmable thermostat (KRFTP-B) that communicates wirelessly with a 20A 120/240V relay (KRFLR-120/240V) wired to the heating unit.
For enhanced flexibility, the system supports optional RF sensors to manage operation based on room occupancy, open windows/doors, or a master setback switch for the entire building.
Kit Contents and Features
Included Components:
- KRFTP-B RF 24V RF Thermostat
- KRFLR-120/240V 20A RF heating relay
Key Features:
- Wireless Two-way RF communication - 915 MHz
- Controls 120/240V 20A Electric Heat
- 7-day programmable schedule
- Temperature Range: 44°F to 90°F (7°C to 32°C)
- Accuracy: ± 1°F
- Optimal start/stop functionality
- Keypad lockout feature
- Maximum heat temperature limits set between 44°F and 90°F
- Supports optional RF sensors for occupancy detection or window status
- 2 Year Limited Warranty
System Diagram Description
The system diagram illustrates the wireless connection between the King KRFTP-B thermostat and the KRFLR-120/240V relay. The relay is connected to a 120/208/240V PAW Heater and can handle up to 20A. The thermostat, powered by 24V DC or AA batteries, communicates with the relay using RF 915 MHz signals.
Optional RF accessories enhance the system's capabilities:
- KRF-PIR-SENSOR: An RF battery-powered Occupancy PIR Sensor that enables automatic temperature setback when a room is unoccupied. Setback options range from 44°F to 65°F.
- KRF-WINDOW-SENSOR: An RF battery-powered Window/Door Sensor that allows automatic temperature setback when a window or door is left open. Setback options range from 44°F to 65°F.
- KRF-MASTER-SWITCH: An RF battery-powered Master Setback Switch providing a manual control to setback all paired systems upon exiting a building. Setback options range from 44°F to 65°F.
- KRF-REPEATER: A 5V USB-C Powered RF Signal Amplifier designed to extend the range of the wireless transmission.
Engineering Specifications
KRFTP-B Programmable Thermostat Specifications:
| Specification | Details |
|---|---|
| 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; shuts down system early upon PROG transition for energy savings. |
| Deadband | Adjustable 4 to 6 Degrees (Default 5) |
| Differential | Adjustable 0.5°F to 2.0°F (Default 1°F) |
| 2nd Stage Offset | Adjustable 2°F to 5°F (Default 3°F) |
| Heat Schedule Options | 5+2 / 5+1+1 / 7-Day (Default: 5+2) |
KRFLR-120/240V Electric Heat Relay Specifications:
| Specification | Details |
|---|---|
| Power Supply | 120-240VAC / 50-60Hz |
| Power Consumption | 25VA |
| Relay Contact Rating | 240Vac/20A |
| Wireless Operation | RF Connect Button |
| Working Frequency | 915 MHz |
| Working Distance | 30 Meters |
| Approvals | cULus |
Ordering Information
Complete Kit:
| Model | UPC | Description |
|---|---|---|
| KRF-HEAT-KIT | 70425 | RF Thermostat Kit, w/ 1 x KRFTP-B Programmable BP Thermostat & 1 x KRFLR-120/240V Heat Relay |
Order A'la Carte:
| Model | UPC | Description |
|---|---|---|
| KRFTP-B | 70134 | Programmable Battery Powered Multi-System RF Thermostat |
| KRFLR-120/240V | 70135 | 20A Heat Relay, 120V or 240V |
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-MASTER-SWITCH | 70156 | Master Switch, Battery Powered, For KRFTP Thermostat |
Submittal Sheet Template
The document also includes a Submittal Sheet template for project documentation. This template requires information such as:
- Job Name
- Location
- Architect
- Engineer
- Contractor
- Submitted By
- King Contact (Quotes@king-electric.com)
- Date
- Item details including Tag, Qty, Item Number, Watts, Volts, PH, Amps, and Weight.
- An Accessories section with Tag, Qty, and Item Number.
