VOKERA Hydra Installation & Servicing Instructions Manual - page 27
25
Service parameters must only be changed or adjusted by qualified service personnel
Parameter
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
Description
Minimum setting for flow sensor
Minimum setting for external sensor
Maximum setting for external sensor
Frost setting for external sensor
Calibration for external sensor
Temperature block
Booster
Night set-back temperature
Maximum fan speed for heating (hundreds)
Maximum fan speed (units)
Maximum fan speed for hot water (hundreds)
Maximum fan speed for hot water (units)
Minimum fan speed (hundreds)
Minimum fan speed (units)
Ignition fan speed
Pump over-run
Pump over-run after DHW request
Set point drop before re-lighting (heating)
Set point overshoot before burner off (heating)
Set point drop before re-lighting (DHW)
Set point overshoot before burner off (DHW)
DHW pre-heat temperature drop before re-lighting
Pre-heat temperature overshoot before burner off
Heating anti-cycle
DHW anti-cycle
Heating request delay after DHW request satisfied
Temperature differential required for modulation
Unused
Unused
Termo-regulation mode (external sensor)
Unused
Temporary manual fan speed setting (20 minutes)
Unused
Unused
Unused
Unused
Unused
Normal output/off/minimum output/off cycle
Range
5
°
C - 60
°
C
-20
°
C - 10
°
C
15
°
C - 25
°
C
-30
°
C - 10
°
C
-5
°
C - 5
°
C
1
°
C - 60
°
C (00=OFF)
1-30 minutes (00=OFF)
0
°
C - 80
°
C
10 - 55
00 - 99
10-55
00 - 99
05 - 55
00 - 99
05 - 55
01 - 99 minutes
1-30 (1=10.2 secs.)
0
°
C - 20
°
C
0
°
C - 10
°
C
-5
°
C - 30
°
C
-5
°
C - 30
°
C
-5
°
C - 30
°
C
-20
°
C - 30
°
C
0 - 30 (1=10.2 secs.)
0 - 30 (1=10.2 secs.)
0 - 30 (1=10.2 secs.)
5
°
C - 40
°
C
0-7
see documentation
0% - 100%
00 = OFF, 01 = ON
New setting
Factory setting
20
°
C
-15
°
C
20
°
C
-1
°
C
0
°
C
25
°
C
00
20
°
C
55 (5500 RPM)
00
55 (5500 RPM)
00
17 (1700 RPM)
00
44* (4400 RPM)
10 minutes
1 (10.2 secs.)
5
°
C
2
°
C
-3
5
15
-2
9 (91.8 secs.)
0 (0 secs.)
3 (30.6 secs.)
25
°
C
-1 (=OFF)
15
00
08
-1 (= OFF)
24
00
35
10
20
00
7.4
ADJUSTING THE GAS VALVE
The gas valve must be set-up or adjusted with
the aid of o properly calibrated flue gas
analyser.
Isolate the appliance from the electrical supply and
remove the appliance casing as described in 4.10.
Unclip and remove the front air chamber cover.
Set the flue gas analyser to read CO
2
and insert
the probe into the flue analysis test point (fig. 1).
Restore the electrical supply to the boiler and
generate a request for central heating via the
room thermostat and/or timer.
Press the
mode
and
-
buttons at the same
time, the boiler will now run at minimum power for
15 minutes.
Consequently, by pressing the
mode
and
+
buttons at the same time, the boiler will run on
maximum power for 15 minutes.
7.4.1
MINIMUM SETTING
With the boiler operating at minimum output the
CO
2
reading should be 9.8% (+/- 0.2%). If the CO
2
reading is correct, proceed to section 7.4.2. If the
CO
2
reading is incorrect, the minimum gas
pressure must be adjusted as follows:
●
Using a suitable screwdriver, very slowly turn
the minimum adjustment screw (fig. 33) –
clockwise to increase, counter clockwise to
decrease – until the correct value is displayed
on the CO
2
analyser (allow time for the analyser
to stabilise).
*This is the setting for Natural Gas. On LPG versions, the factory setting is 30 (3000RPM)
Don’t change the factory setting of the unused parameters
!