34
Concord ESi
- Installation and Servicing
INSTALLATION
51
SETTING PROCEDURE
(all boilers)
+
,
*
CON5295
+
-
CON5296
/
0
CON5297
1.
Adjusting the 2nd stage pressure:
-
Connect the pressure gauge to the manifold pressure tapping.
-
Operate the boiler at the 2nd stage acting upon the thermostat(s).
-
Adjust the burner injector pressure indicated in Table 1 as follows:
• unscrew the slotted head screw
C
by approximately one turn and
unscrew completely the adjusting knob
D
(turning it counter-
clockwise), then tighten again screw
C
.
• adjust the injector pressure adjustment screw
B
of the regulator.
Clockwise rotation increases the pressure, counter-clockwise
rotation decreases it.
2.
Adjusting the 1st stage pressure:
-
Operate the boiler at the 1st stage acting upon the burner
operation selecting switch located on the boiler control panel.
-
Adjust the flow in order to obtain the injector pressure indicated in
Table 1 (0.5 x the 2nd stage pressure) as follows:
-
Adjust the 1st stage flow with the help of ring
E
. Clockwise rotation
decreases the pressure. Counter-clockwise rotation increases
the pressure
-
Tighten locking screw
C
.
3.
Adjusting the starting rate (or initial flow):
Start rate is factory-set to the minimum (9 mb starting pressure).
Depending on the installation conditions, one may adjust the start rate
setting in order to ensure an optimal start of the boiler. The maximum
permissible is 12 mb.
Proceed as follows:
-
Unscrew protection cap
G
, turn it over and use it as a key to turn
adjusting spindle
H
until obtaining the initial flow required.
Counter-clockwise rotation increases the initial flow, clockwise rotation
decreases it.
-
After adjustment, put cap
G
back in place.
52
CHECKING GAS PRESSURE SWITCH
The minimum gas pressure switch fitted on the gas valve is factory set to
12.5 mbar. If the gas supply pressure drops, the minimum pressure
switch turns the boiler off.
53
SPILLAGE CHECK
Check there is no spillage of combustion
products from the boiler draught diverter by
carrying out a spillage test, as detailed in
BS. 5440:1.
con9065
INST
ALLA
TION