46
SERVICING
isar + programmer -
Installation and Servicing
time
P R O G R A M M E R
prog
prog
select
select
+
-
nm84
3
7
itime
programmer
unit
2
itime
programmer
unit
nm84
3
8
time
P R
O G
R A
M
M
E R
prog
prog
select
select
+
-
Note.
Only the display unit is replaced.
1.
Refer to Frame 52.
2.
Loosen the screw on the underside of the user control.
3.
Pull the display unit forward to remove.
4.
Push the new display unit into position.
5.
Reassemble in reverse order.
6.
Check operation of the boiler. Refer to Frame 52.
68 USER CONTROL REPLACEMENT
69 PRESSURE GAUGE REPLACEMENT
1.
Refer to Frame 52.
2.
Drain the boiler. Refer to Frame 72.
3.
Unscrew the pressure gauge and discard.
4.
Fit the new pressure gauge, using a suitable jointing
compound.
5.
Refill the boiler. Refer to Frame 31.
6.
Check operation of the boiler. Refer to Frame 52.
2041
Pressure gauge
Flow isolation valve
(shown in the open position)
SER
VICING
202851-1new.pmd
17/11/2006, 07:41
46