Roberts Gorden DAT115 Manual Do Utilizador

28 

After commissioning, the DualAir

®

 unit will require 

maintenance to be carried out annually. If the 
DualAir

®

 unit is used in a dirty or dusty area, more 

frequent maintenance may be necessary.

Installation, service and annual inspection of heater 
must be done by a contractor qualified in the 
installation and service of gas-fired heating 
equipment.

NOTE 1: After any maintenance or repair work 
always test fire the heater in accordance with the 
commissioning instructions on Page 21, Section 11 
through Page 24, Section 11.9

 to ensure all safety 

systems are in working order before leaving the 
heater to operate. Minor faults may be traced by 
using the troubleshooting charts on Page 31, 
Section 15

 through Page 34, Section 15.5.

NOTE 2: Check all gas pipes and pipe joints to 
ensure there are no cracks or gas leaks.

NOTE 3: Inspect all suspended components and 
hardware. Insure that they are in good condition, 
properly tightened, and corrosion free.

13.1.1 Cooling Equipment
The cooling coil does not require maintenance 
except that during filter replacement it is 
recommended to clean the surface of the coil with a 
soft brush and vacuum cleaner. Carry out any 
maintenance recommended by the condenser 
manufacturer.

13.1.2 Filters
The air filters should be inspected regularly to 
ensure that no excessive build up of deposit is being 
experienced. If heavy deposit is being formed, then 
the filters may be cleaned using a vacuum cleaner. 
Filters should be replaced at least every four months 

to ensure that adequate air flow.
The cooling equipment will automatically turn off 
should the air flow drop to a preset low value even 
though the fan will still run. The maximum resistance 
across a dirty filter should be no more than 150 Pa 
(1.5 mbar) and the dirty filter warning light will be on. 
A resistance higher than this indicates that the filters 
must be replaced.

1. Open the hinged door and remove the burner 

compartment cover. See Page 37, Section 16.2.

2. Clean any deposits from the main burner which 

may have formed in the injectors or venturi of 
the burner. See Page 37, Section 16.2.

3. Remove the ignition electrode and flame probe. 

Check condition of ignition electrode and flame 
probe. Clean off any deposits which may have 
been formed, check condition of ceramic 
insulators. Replace as necessary.

13.3 Fan/Motor Assembly Maintenance
The main fan bearings are permanently sealed and 
do not need lubrication. Before cleaning, turn off gas 
and electrical supply. Remove the fan compartment 
covers and use a small brush or duster to clean the 
fan blades from each side. Replace fan(s) when 
done.

Check the condition and tension of the drive belts.
The condition is best inspected with the belts 
removed. Check for chaffing or lateral cracks. 
Replace belts as a matched pair as necessary.
Do not over-tighten belts, as this may cause bearing 
damage.

13.4 Heat Exchanger Maintenance
The heat exchanger will remain clean unless a 
problem has developed with combustion. Inspect the 
heat exchanger. Look for signs of overheating at the 
front tubes which may indicate burner over firing or 
persistently low air flows.

Motor

Pulley

Fan

Pulley

8 mm to 10 mm