Johnson & Starley JU156

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These appliances have been tested and certified by B G Technology for use with natural gas.

1. BRIEF DESCRIPTION

1 Air circulating fan

2 Control Panel

3 Data plate

4 Limit Switch

5 Multifunctional control

6 Burner and Control Assembly

7 Gas connection

8 Fan Delay Control

9 Piezo unit

10 Summer Air Circulation switch

11 Draught Diverter

JU SERIES WARM AIR HEATERS

INSTALLATION, COMMISSIONING & SERVICING INSTRUCTIONS

JU78: G.C. No 42 417 79

JU117: G.C. No 42 417 78

JU156: G.C. No 42 417 77

Publication No. ZZ 602/6

June 2003

These instructions are to be left with the User or adjacent to the Gas Meter

Fig. 1

General Layout Diagram

1.1 JU78, JU117 and JU156 are open-flued, fan assisted Upflow, ducted warm air heaters, the outputs of which are as

follows:

JU78: 23.0kW (82.8MJ/h, 78,500Btu/h)

JU117: 34.3kW (123.4MJ/h, 117,000Btu/h)

JU156: 45.7kW (164.5MJ/h, 156,000Btu/h)

THESE APPLIANCES CONFORM TO BS800

Johnson and Starley prides itself on its ability to supply spare parts quickly and efficiently. If you have a problem in obtaining a

spare part, please contact Johnson and Starley Spares Department at the address below.

JOHNSON & STARLEY LTD.

Telephone: (01604) 762881 Rhosili Road,

Brackmills,

Fax: (01604) 767408 Northampton NN4 7LZ

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Summary

Product Overview

Brief Description

Provides a summary of the JU series warm air heaters and their purpose.

General Layout Diagram

Illustrates the physical layout and key components of the appliance.

Appliance Outputs

Details the heating outputs for JU78, JU117, and JU156 models.

General Data and Installation Checks

General Data

Lists technical specifications like dimensions, weight, flue diameter, and fuse rating.

Heater Compartment and Clearances

Specifies minimum spatial requirements around the heater for safe installation.

Ventilation and Combustion Air

Outlines essential air supply requirements for proper operation.

Duct System

Return Air

Details duct sizing and grille free area requirements for the return air path.

Warm Delivered Air

Covers insulation and design considerations for the warm air ducting system.

Installation Requirements

Flues

Covers flue installation standards, joints, length, support, and compliance.

Electrical Installation

Details mains connection, wiring requirements, and thermostat installation.

Gas Installation

Outlines gas supply pipe, union gas cock, and leak testing requirements.

Commissioning

Preparation and Fan Speed Setting

Covers initial checks, preparation, and setting fan speed.

System Balancing

Details procedures for balancing the air distribution system.

Pilot and Main Burner Ignition

Step-by-step guide for igniting pilot and main burners.

Main Burner Pressure Test

Procedure for testing and adjusting the main burner pressure.

Burner Extinction and Temperature Rise Test

Verifies burner extinction and measures the heater's temperature rise.

Automatic Controls Check

Tests the functionality of automatic controls like thermostat and fan sequencing.

Safety Checks

Includes crucial checks like gas soundness and spillage tests.

Instructions for Users

Maintenance

Routine Maintenance

Outlines regular servicing tasks for optimal performance and safety.

Burner and Controls Assembly Servicing

Procedures for removing and servicing the burner and control assembly.

Injector and Burner Arm Servicing

Covers removal, cleaning, and replacement of injectors and burner arms.

Pilot Burner Component Servicing

Details removal and replacement of pilot burner, thermocouple, and electrode.

Control Unit and Panel Servicing

Instructions for removing multifunctional control, piezo unit, and control panel.

Fan and Fan Control Servicing

Steps for removing and cleaning fan assembly, capacitor, and fan delay control.

Limit Switch and Heat Exchanger Access

Instructions for removing limit switch and accessing the heat exchanger.

Defect Diagnosis

Pilot Ignition Failures

Lists causes and remedies for pilot light failure.

Pilot Light Extinguishes After Ignition

Addresses issues where the pilot light goes out after ignition.

Main Burner or Fan Operation Faults

Covers faults like fan failure, intermittent operation, noise, and pilot-only ignition.