HW130
–HW160 Hot Water Boilers
9
Notes
1. An automatic heating bypass valve should be fitted to maintain adequate flow rate through the boiler when
thermostatic valves are fitted and or when the majority of radiators are required to be turned off for long
periods of time.
2. Any pipe work that is in an unheated area such as under the floor or in the ceiling space should be suitably
insulated to prevent heat loss and possible freezing of the pipes.
3. The pipe work should be graded to facilitate the elimination of air at the highest point and the draining of
the system at the lowest point. Provide air bleeds and drains at these points.
3.8 SIZING OF PRESSURE VESSEL
If the total water capacity of the heating system is greater
than 60 litres then an additional pressure vessel should be
fitted. An approximate figure can be calculated from the
following table. An additional tank can be fitted at a
convenient location on the system if required.
4.0 COMMISSIONING
4.1 STARTING BOILER
Fill system with water and purge all air from system and pump.
Purge gas line of any air and wait five minutes for gas to clear.
Plug three pin plug into a suitable power point and switch on. Digital controller should now operate and
indicate water temperature.
Pump should start, the flow symbol should be displayed.
Turn controller switch ON.
After a few seconds, the burner should ignite. (Do not light by any other means.)
If the burner fails to light, check flow indicator is on. Turn controller switch OFF for 5 seconds then ON to
reset ignition system. (Trouble shooting page 15.)
Allow boiler to run. Check there are no leaks and there is flow to all of the system.
4.2 TESTING BURNER PRESSURE
Set up manometer
Turn boiler “OFF”.
Open lower front door.
Remove screw from ⅛” brass test point located on outlet side of gas valve.
Connect manometer tube to test point
T
urn boiler “ON” and wait for main burner to ignite.
Once main burner has ignited, the manometer must indicate the nominal burner pressure listed below.
To adjust gas valve regulator, remove regulator adjustment cap and, using a screwdriver, turn plastic bush
clockwise to increase, anti-clockwise to decrease burner pressure.
When correct pressure is set turn boiler off.
Refit test point screw, fibre washer and regulator adjustment cap.
Check all gas connections are tight and not leaking.
Close front door.
Item
Capacity
litres
per
Therma rad Radiators
0.70
kW
Thermaboard single
0.22
metre
Thermaboard double
0.44
metre
Copper tube 25 mm
0.44
metre
Copper tube 20 mm
0.23
metre
Copper tube 15 mm
0.10
metre
Typical two pipe system
Hydronic Boiler
Return
Radiator/Heat emitter
Flow
Flow
Flow
Bypass
valve
Summary of Contents for HW130
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