32
OXYGEN TRIM OPTION
WARNING: Use extreme care when handling the oxygen probe and wear heatproof gloves.
Ensure the burner is off before removing the oxygen probe from the flue.
If the boiler is to be operated with the probe removed, fit the blanking cover supplied since
dangerous levels of carbon monoxide may be present in the flue.
Oxygen Probe
The oxygen trim / monitoring function is designed to be used with an NX2012 oxygen probe. This
probe offers fast, accurate response and good reliability when mounted in accordance with the guide-
lines in this section.
The probe is available in three different sizes.
Model
no.
2012/1
2012/2
2012/3
A
173(6.81)
362(14.25)
716(28.19)
757(29.8)
406(15.99)
215(8.5)
B
C
295(11.6)
486(19.13)
873(32.95)
D
470(18.5)
659(25.95)
1013(39.88)
Dimension
*02-
02+
PROBE T/C-
PROBE T/C+
FLUE T/C-
FLUE T/C+
HEATER
HEATER
CUSTOMER
CONNECTIONS
INCH EQUIVALENTS ARE IN ( )
ALL DIMENSIONS IN MILLIMETRES
INTERNAL
CONNECTIONS
COMPONENT SIDE VIEW OF INTERNAL
ELECTRICAL INTERCONNECTION PCB.
* NOTE: 02- CONNECTED TO PROBE BODY. ie. GROUND
SIDE VIEW
CASE MATERIAL: CORROSION RESISTING STEEL.
FINISH: SELF.
TOTAL ASSEMBLY WEIGHTS: MODEL 2012/1 - 2.95kg (6.5lb)
MODEL 2012/2 _ 3.40kg (7.5lb)
MODEL 2012/3 - 4.24kg (9.4lb)
TO MOUNT ON FLAT WALL FLUES (STACKS) SEE DRG. No.HG220371E PART A.
TO MOUNT ON CYLINDRICAL WALL FLUES SEE DRG. No.HG220371E PART B.
FOR PROBE MOUNTING POSITIONS SEE DRG. HG220559E.
CL
E
ARANCE
RE
Q
U
IR
E
D
T
O
IN
ST
A
L
L
&
REM
O
VE
F
R
O
M
F
L
U
E
.
SEE D
IM.
D
.
CALIBRATION GAS CONNECTION.
96(
3.
8)
Ø 20 FLEXIBLE
CONDUIT ENTRY.
246(9.7)
& REMOVE FROM FLUE. SEE DIM.C.
CLEARANCE REQUIRED TO INSTALL
SEE DIM. B.
30º
3
5
(1
.4
)
SEE D
IM.
A
.
FLUE GAS
2 TYP.(0.08)
