Powrmatic DHM Manuel utilisateur

Users Instructions

WARNING: THIS APPLIANCE MUST BE EARTHED

£1.00 When supplied separately. DHM Range Issue 1 July 1999

The DHM Range

1. Lighting the Module

NOTE: On initial lighting of the module, it may take

some time to purge the internal pipework of air.

If it is not possible to light the module after

several attempts contact the local service

company.

1. To Start the Module

1.1 Follow the start up instructions for the duct

heater or air handling unit.

1.2 When all external and internal controls are

calling for heat the burner start-up sequence

will commence. The exhaust fan will run and

after a pre-purge period of approximately 30

seconds an ignition spark will be generated at

each burner.

The main gas valves will open and the burners

will be established

NOTE: If any burner fails to establish it will go to

lockout and the lockout indicator / reset button

on that burner control box will be illuminated.

To restart the burner push the lockout reset

button.

If a burner will not light after four or five

attempts then shut down the unit and call in

a service engineer.

NOTE: If there is loss of flame signal at any burner

during normal running the control box will

immediately initiate spark ignition. If the burner

fails to relight it will go to lockout.

2. To Shut Down the Module

2.1 For Short Periods:

Follow the instructions provided with the duct

heater or air handling unit so that external

and/or internal controls are not calling for

heat.

2.2 For Long Periods:

Complete 2.1 above, wait approximately 4-5

minutes for the exhaust fan of the module to

stop running and then turn OFF the gas and

electric supplies to the module.

3. Description of Operation

Important: All heaters must be controlled by the

fitted external controls and not by use of the main

switch in the electrical supply to the heater.

The burner start up sequence will commence

each time that the external controls call for heat.

The exhaust fan will run and after a pre purge

period off approximately 30 seconds an ignition

spark will be generated at each burner. The main

gas valves will be opened and the burners

established. When the external controls are satisfied

the burners will be turned off and approximately

4 - 5 minutes later the exhaust fan will be

automatically stopped.

4. Limit Thermostat

The limit thermostat is mounted towards the top

of the module inner panel.

i) Limit Thermostat Reset

In the event of a fault that causes the temperature

of the air within the module to rise significantly

e.g. Blocked air inlets, the limit thermostat will

operate to shut down the burners. Remove the

cause of the fault, wait 10 minutes and then reset

the thermostat by pushing the red reset button

(Refer to Figure 1 ). If the limit thermostat continues

to operate call a service engineer.

5. Maintenance

Regular servicing is essential to maintain efficient,

reliable and safe operation of the module. Users

are strongly recommended to have the module

serviced at least annually and preferably at the

end of the heating season.

6. IMPORTANT

Free access must be maintained to and around the

module for servicing purposes and the air supply

to the heater must not be restricted in any way.

Combustible materials must not be stored adjacent

to the module or the unit it is fitted into.

If at any time a gas leak is suspected turn OFF the

gas supply - DO NOT USE A NAKED FLAME - and

contact the local gas undertaking immediately.

PUSH TO

RESET

PUSH MAN

PULL AUTO

Honeywell

Red

reset

button

Fig 1. Limit Thermostat

Every effort is made to ensure accuracy at time of going to press. However as part of our policy of continual product improvement, we reserve the right to alter specifications without prior notice.

HEATING DIVISION

Winterhay Lane

Ilminster, Somerset TA19 9PQ

Tel: 01460 53535 Fax: 01460 52341

BSI Registered Firm

FM 414

Ind. & Comm. Air Heaters;

Air Moving Equipment;

Flues & Chimneys; Natural

Smoke & Heat Ventilators;

Powered Supply & Extract

Fans & Systems.

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