York 6HK Series - User Manual

The provided document is an installation manual for the ELECTRIC HEATER ACCESSORY (6HK SERIES), designed for use with AHR, AHE, AHV, RFCXE, and RFCXP air handler models. This accessory provides electric heat for both cooling with electric heat and heat pump with electric heat applications.

Function Description

The 6HK series electric heater accessory is designed to integrate with specific air handler units to provide supplemental or primary electric heating. These kits utilize a single polarized plug for easy connection to the air handler's power and controls. The installation process involves inserting the heater kit into the air handler, securing it, and connecting the power and control wiring. The manual emphasizes that installation should be done prior to the unit's overall installation and in accordance with the provided tables and diagrams.

Important Technical Specifications

The manual includes a table of models covered, detailing the heater kW at 240V and corresponding 1-phase and 3-phase heat kit models.

Heater kW @ 240V and Corresponding Heat Kits:

2.4 kW: 6HK(0,1)6500206 (1 Phase)
4.8 kW: 6HK(0,1)6500506 (1 Phase)
7.7 kW: 6HK(0,1)6500806 (1 Phase)
9.6 kW: 6HK(0,1)6501006 (1 Phase), 6HK06501025 (3 Phase)
12.5 kW: 6HK(1,2)6501306 (1 Phase)
14.4 kW: 6HK(1,2)6501506 (1 Phase), 6HK06501525 (3 Phase)
17.3 kW: 6HK(1,2)6501806 (1 Phase), 6HK06501825 (3 Phase)
19.2 kW: 6HK(1,2)6502006 (1 Phase), 6HK16502025 (3 Phase)
24.0 kW: 6HK(1,2)6502506 (1 Phase), 6HK16502525 (3 Phase)

Nomenclature - Electrical:

6: Electric heat for AHR/AHE/AHV/RFCXE/RFCXP residential air handlers
HK: Electric Heater
Power Connection:
- 0: Terminal Block
- 1: Circuit Breaker
- 2: Circuit Breaker & Single Point wiring kit
65: Electric Heater (Class Identifier)
Electric Heat, Nom. kW:
- 002 = 2.5kW
- 005 = 5kW
- 008 = 8kW
- 010 = 10kW
- 013 = 13kW
- 015 = 15kW
- 018 = 18kW
- 020 = 20kW
- 025 = 25kW
Voltage Code:
- 06 = 208/230-1-60
- 25 = 208/230-3-60
B: Indicates Sequential Change of Component Style

Air Handler Compatibility: The manual provides a detailed table outlining compatibility with Rev A and Rev B air handlers in upflow/horizontal and downflow configurations.

Heat kits with terminal blocks or 1 circuit breaker (e.g., 6HK06500206 to 6HK16501006): Compatible with Rev A Upflow/Horizontal, Rev B Upflow/Horizontal, and Rev B Downflow.
Early version heat kits with 2 or 3 circuit breakers (e.g., 6HK16501306 to 6HK26502506): Compatible with Rev A Upflow/Horizontal and Rev B Upflow/Horizontal, but NOT with Rev B Downflow.
Revision B heat kits with 2 or 3 circuit breakers (e.g., 6HK16501306B to 6HK26502506B): Compatible with Rev A Upflow/Horizontal, Rev B Upflow/Horizontal, and Rev B Downflow.
3-Phase Heat kits with terminal blocks (e.g., 6HK06501025 to 6HK06501825): Compatible with Rev A Upflow/Horizontal, Rev B Upflow/Horizontal, and Rev B Downflow.
3-Phase Early version heat kits with 2 breakers (e.g., 6HK16502025, 6HK16502525): Compatible with Rev A Upflow/Horizontal and Rev B Upflow/Horizontal, but NOT with Rev B Downflow.
3-Phase Revision B heat kits with 2 breakers (e.g., 6HK16502025B, 6HK16502525B): Compatible with Rev A Upflow/Horizontal, Rev B Upflow/Horizontal, and Rev B Downflow.

Clearance: All installations of 6HK electric heater kits are approved for zero-clearance to combustibles, provided the minimum speed tap on the blower motor is set according to the air handler installation instructions or nameplate.

Electrical Controls: The electric heaters feature both auto-resettable and one-shot thermal limit controls. A 24-volt power supply is provided by an internally wired low voltage transformer, standard on all air handler models.

Usage Features

Versatile Installation: The installation process is consistent across all Rev B model air handler operating positions, including upflow, downflow, and horizontal right or left. However, specific compatibility notes apply for downflow configurations with certain heat kit revisions.
Easy Connection: The 6HK series heat kits use a single polarized plug for straightforward connection to the air handler's power and controls.
Flexible Power Options: Field wiring connects to heat kits with either circuit breakers or terminal blocks, depending on the specific model. Multiple circuit, single-phase heater kits offer options for a single power supply. For 3-phase 20kW and 25kW kits with multiple circuits, a single-point power accessory kit can be ordered separately.
Low Voltage Control: The low voltage transformer and fan control are standard features, simplifying integration with existing control systems. Field-supplied low voltage wiring can exit the unit from the top right-hand corner or the right-hand side panel, with instructions provided for proper routing and sealing to minimize air leakage.

Maintenance Features

Safety Controls: The electric heaters are equipped with both auto-resettable and one-shot thermal limit controls. In case of a failure, the one-shot thermal limit control must be replaced with a direct replacement, ensuring continued safe operation.
Installation Guidelines for Longevity: The manual emphasizes critical installation steps to ensure proper function and longevity, such as carefully passing the heating element through the rectangular opening in the discharge duct and securing the element mounting plate with four screws.
Wiring Integrity: Instructions highlight the importance of verifying that edges of foil-faced insulation are not in contact with any exposed electrical connections, which is crucial for preventing electrical hazards and ensuring reliable operation.
Air Leakage Prevention: Steps are provided to minimize air leakage at the field wiring entry point, contributing to the overall efficiency and performance of the air handler system. This includes using the smallest possible hole, installing a 7/8" plastic bushing, and sealing the wiring entry point.

York 6HK Series Specifications

General

Brand	York
Model	6HK Series
Category	Accessories
Language	English

York 6HK Series - User Manual

Summary

General Information and Safety

Electrical Shock Hazard Warning

Installation Clearance Requirements

Electric Heater Models

Electrical Nomenclature

Product Category Definition

Family Identifier Definition

Power Connection Types

Class Identifier Definition

Nominal kW Ratings

Voltage Code Definitions

Style Letter Definition

Heater Installation Procedure

Installation Caution

Foil Insulation Warning

Heat Kit and Air Handler Compatibility

Line Power Connections

1 Phase Electric Heat Power Options

3 Phase Electric Heat Power Options

Electric Heaters and Operating Controls

Thermal Limit Controls

Low Voltage Control Connections

Typical Installed Application Diagrams