3
Harrier GTS, Viceroy GTS, Viscount GTS -
User's
1
BOILER CONTROLS
2
CONTROL OF WATER TEMPERATURE
The water temperature is controlled by the boiler thermostat (item 3A). The temperature range of the thermostat is 30 - 90
o
C for
ON/OFF operation. For boilers fitted with high/low burners, a 2nd stage thermostat controls the burner changeover from high to
low fire at a recommended setting 5
o
C lower than the maximum flow temperature setting.
Note.
The setting numbers 3-9 are approximately scaled to represent 30-90
o
C.
To Light the Boiler
(Refer to Frame 1)
1.
CHECK THAT THE ELECTRICITY SUPPLY TO THE BOILER
IS OFF.
2.
Set the boiler on/off switch (1) to OFF.
3.
Set the boiler flow temperature control (3A) to maximum (1st
stage control if high/low burner fitted).
4.
Switch on the electricity supply to the boiler and check that all
external controls, e.g. programmer, room thermostat etc., are
on.
5.
Set the boiler on/off switch (1) to ON.
The boiler will commence the ignition sequence, supplying
heat to the system when required.
Note.
If the burner does not ignite refer to the burner
instructions.
6.
Set the boiler flow temperature control (3A) to the desired
setting. If a high/low burner is fitted, set the 2nd stage
temperature control (3B) to a setting 5
o
C lower.
Settings below 4 (approx. 40
o
C) are not recommended, in
order to avoid the risk of combustion products condensing
on the walls of the boiler.
7. Burner
Refer to the instructions supplied with the burner for specific
control features.
7
6
2
1
3A
3B
4
5
har9096
1.
Boiler ON/OFF switch.
Position .....ON Position .....OFF
2.
TEST STB:
When held in the pressed (momentary use) position it
tests the safety thermostat.
Note.
If two stage burner control fitted operation will
continue on 1st stage after 2nd stage cut-off.
3.
Boiler Thermostats:
Adjustment range 30-90
o
C
For ON/OFF burners use 1st stage thermostat only.
For two stage burners set 2nd stage 5
o
C below 1st
stage setting.
4.
Boiler Thermometer
5.
Location for Flue Gas Thermometer (Optional)
6.
Timed Circuit Breaker:
10A with delayed action and manual reset.
7.
Safety Thermostat:
Set at 110
o
C. Manual reset.
