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Installation & Maintenance Instructions
Models covered by these instructions
JT19-25 Mk 2 WARM AIR HEATER (MODAIRFLOW & Conventional Control)
(56.53)
UDC 697.
Publication ZZ 302/5
The JT19-25 Mk2 is a Gas Fired Warm Air Heater for open flue application. Output is adjustable between 5.6kW — 7.3kW (20MJ/h, 19,000 —
26.4MJ/h, 25,000 Btu/h) and there is 5 speed fan adjustment.
CIRCULATOR WATER HEATERS — all air heaters have provision for the internal fitting of a JANUS 3. or ELJAN or a HIJAN circulator.
If a water heater is provided factory fitted, the heater designation is JT19-25 Mk2 JAN ELJ or HIJ depending on requirement.
To fit a water heater on site, obtain from Johnson & Starley Ltd. a Janus 3 Water Heater and LK19 Fittings Kit.
To fit HIJAN order a HIJANS and LK19 and HEI192 Fittings Kit.
To fit ELJAN order an ELJAN S and LK19 and HEI192 Fittings Kit.
1
Components Check
2
Warm Air Installation requirements
3
Preparation
4
Air Heater Fixing
5
Water Connections
6
Commissioning
7
Maintenance
8
Fault Finding
9
Wiring Diagram
10
Short List of Spare Parts
1. COMPONENTS CHECK
NB: Check that Gas Group on heater data plate is as required JT19.25 Mk 2 AIR HEATER
Fig. 1
JT19-25 Mk 2 WARM AIR
HEATER
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Summarization of Contents
Warm Air Installation Requirements
Ventilation of Heater Compartment
Specifies ventilation requirements for the heater compartment, including grille sizes and airflow.
Ventilation of Building
Details required ventilation openings in the building for the heater's operation and room air circulation.
Return Air
Covers the connection of return air ducting and required grille areas for rooms served by the heater.
Preparation
Flues
Requirements for the installation of a single 100mm (4") twin wall flue system for the heater.
Electrical Connections
Instructions for making mains and room thermostat electrical connections, including polarity for MODAIRFLOW models.
Gas Supply
Guidance on the gas supply connection, pipe size, union tap, and adherence to regulations.
Heater Installation Clearances
Specifies minimum clearances required around the heater for safe installation and servicing access.
Installation on Suspended Floors
Details insulation requirements for combustible floors and the use of base ducts or plenum systems.
Maintenance
Main Burner Cleaning
Procedure for cleaning the main burner and crosslighter assembly, including cover plate removal.
Injector Cleaning
Instructions for cleaning or replacing main and pilot burner injectors, emphasizing orifice care.
Thermocouple
Guidance on ensuring the thermocouple connection to the Gas Control is tight for proper operation.
Fan and Fan Motor Cleaning
Steps for cleaning the fan impeller and motor, stressing the importance of maintaining fan balance.
Gas Pressure Check
Procedure for checking gas pressure at the test point and verifying gas rate, with notes on screw retightening.
Gas Control 'fail-safe' Operation Check
How to check the gas control 'fail-safe' operation by reducing the pilot flame until it extinguishes.
Pilot Flame Check
Guidance on checking the pilot flame to ensure it envelops the thermocouple probe and how to adjust it.
Automatic Controls Inspection
Instructions for inspecting automatic controls, including checking their function during operation.
Time Control Removal
Steps to remove the time control unit, involving loosening screws and disconnecting leads.
Electrical Panel Removal
Procedure for removing the electrical panel, including disconnecting plugs and leads.
Air Circulating Fan Removal
Instructions for disconnecting and removing the fan assembly, emphasizing careful handling.
Heat Exchanger Access
Steps for accessing the heat exchanger for inspection and cleaning, including baffle removal.
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