INSTRUMENT PANEL
Fig.14 - Control Panel Configuration
1
Kit 1 Water Flow Thermometer
- indicates
the water flow temperature of the boiler
(supplied loose).
2
Kit 1 Panel & Hours Run Meters
-
indicates the number of hours the boiler
has run on high and low fire (supplied
loose).
3 & 16
1
st
Stage Control Thermostat and
Indicator light
- controls the temperature of
the boiler between 30°C & 90°C and while
the burner is firing the indication light is
illuminated.
4 & 15
2
nd
Stage Control Thermostat and
Indicator Light
– this thermostat is
normally set between 2°C-5°C below the
control thermostat setting and when this
temperature is reached the boiler will go to
low fire and the indicator light will go out.
5 & 14
Limit Thermostat & High Temperature
Indicator Light
– the indicator light will
illuminate to inform you that the boiler has
gone to overheat and the burner has shut
down and will not restart until the cap is
removed and the manual reset button
pressed. The overheat thermostat will
operate at 110°C.
6
Mains Indicator
– indicates that the power
has been turned on to the boiler.
7
Fuse
– the boiler control panel is fused at
6.3 Amps.
8
Flue Gas Thermometer
– indicates the
primary flue temperature of the boiler
(supplied loose).
9
Pump
Switch
– switches the pump on and
off. (Pump must be connected through a
suitable contactor and pump overrun must
be fitted.
10
Test
Button
– if this button is pressed it
bypasses the control and high/low
thermostats and fires the boiler on high fire,
it can be used to check the operation of the
overheat thermostat.
11
Burner On/Off Switch
– turns the burner
On or Off.
This is not a BOILER On/Off
switch
, components are still live even when
switch is off (mains inlet to the boiler still
requires a suitable 3-pole isolator).
12
Lockout Light
– if during the burner lighting
sequence the control box fails to detect the pilot
flame or it goes out in operation then the burner
will go to lockout and lockout light will be
illuminated.
1
4
7
6
5
3
2
8
9
10
15
14
12
11
16
SECTION 4
POTTERTON COMMERCIAL PRODUCTS DIVISION
INSTALLATION, OPERATION & MAINTENANCE MANUAL
PAGE 20
NXR4
Summary of Contents for NXR4
Page 1: ...NOVEMBER 2003 heating specialists ...
Page 38: ...NOTES ...
