Reznor ULSA 025(EC), Installation Commisioning Servicing & User Instructions

Page: 23 / 30

1701ULSA(EC)--EN, p. 23/30
12. MAINTENANCE
Attention
It is recommended that maintenance is carried out at least once a year. More frequent servicing
may be required dependent upon the environmental circumstances where the air heater is
installed. Regular inspection is necessary, especially in dirty areas, to assess the servicing
frequency.
Removal of service panel
1. Remove door lock at upper and underside.
2. Lift the panel holding it at the bottom.
Substitution of combustion air fan
1. Turn off the main gas supply.
2. Set the room thermostat so there is no heat demand.
3. Wait until the air circulation fan has stopped running.
4. Check that the electrical supply is turned off.
5. Remove the service panel (see ‘removal of service panel’).
6. Disconnect the plugs from the combustion air fan.
7. Remove the bolts between the combustion air fan and the (bent) gas supply tube. Remove the gasket.
8. Remove the fixing screws (or the assembly in case of a ULSA 075/100 EC) connecting the air intake restriction
and the combustion air fan.
9. The combustion air fan can now be removed.
10. Remove all the dust from the combustion air fan with a soft cloth or brush.
11. Check that the motor and the turbine are undamaged.
12. Replace all parts in reverse order.
Substitution of bulb thermostat LC3
1. Wait until the air circulation fan has stopped running.
2. Before starting, ensure that the electrical supply is turned off and locked.
3. Remove the service panel (see ‘removal of service panel’).
4. Remove the bracket by using the LC3.
5. Disconnect the electrical connections on the bulb thermostat.
6. Remove the fixing screws connecting the bulb thermostat to the electrical wiring panel.
7. The whole bulb thermostat is now loose and can be removed.
8. Replace all parts in reverse order.
Substitution of bulb thermostat LC1
1. Remove the thermocouple via the air outlet side of the air heater.
2. Follow the above instructions No 6 to 8 for the bulb thermostat LC3.
Cleaning & substitution of burner
When cleaning and re ‐ installing the burner, it is necessary to make use of a kit specially designed for ULSA/ULSA EC
units. Use only kits which are approved by the manufacturer and which are appropriate for your appliance.
Use kit number 36 25192 025 for unit ULSA (EC) type 025 – For all other types, use kit number 36 25192 035.
Always consult your distributor at the slightest doubt.