Exal
t
Venturi Replacement Kit
4
1. Touch simultaneously on the up and down soft
keys for 3 seconds to access the functions for the
installer. See Fig. 4.
Fig. 4: CTRLMax Navigation Control
2. Enter the installer access code “054” by using the
LEFT and RIGHT buttons to select a digit and the UP
and DOWN buttons to change the digit. Press the
CENTER button to enter the access code.
3. Press the RIGHT button to highlight the Manual
Operation icon then press the CENTER button.
Manual Operation
Released
Off
Off
Off
CH1
FAN
DHW
CH2
Manual Operation
Released
Off
Off
Off
CH1
FAN
DHW
CH2
Manual Operation
Released
Off
Off
Off
CH2
FAN
DHW
CH1
Manual Operation
Released
Off
Off
Off
DHW
FAN
CH1
CH2
Fig. 5: CTRLMax Manual Operation
4. Press the CENTER button while the FAN icon is
highlighted to manually fire the burner and power
the CH circulator. See Fig. 5
NOTICE
An adequate CH load must be present to dissipate the heat
generated during the combustion test. If an adequate CH
load is not available, an indirect water heater can be used to
dissipate the heat by creating a DHW call which will enable
the DHW circulator.
5. Press the RIGHT button to adjust the firing rate to
100% (high fire). Hold down the RIGHT button to
rapidly increase the firing rate.
6. If the combustion levels during high fire are out-
side the recommended combustion settings (see
Table 1), adjust the THROTTLE SCREW (see Fig. 6)
using a flat-blade screwdriver as follows:
Counter-clockwise adjustment of the THROTTLE
SCREW at High Fire (100% firing rate):
O
2
decreases and CO
2
increases
Clockwise adjustment of the THROTTLE SCREW at
High Fire (100% firing rate):
O
2
increases and CO
2
decreases
7.
Once the combustion level is set at high fire, manu-
ally place the boiler into low fire mode by pressing
the LEFT button to adjust firing rate down to 1%
(low fire).
8.
If the combustion level (O
2
or CO
2
) during low fire
is not are outside the recommended combustion
settings in Table 1 contact
Ideal USA
Technical
Support.
9.
Press the CENTER button while the fan icon is high-
lighted to shutdown the burner.
10.
Press the LEFT or RIGHT button to highlight the
home screen icon to exit the service mode.
11.
Replace the front panel and put the boiler back
into operation.
