56
9.7 Commissioning
• Tilt control box upwards. Fasten with clips located at the
sides.
• Open main gas supply.
• Open gas shutoff valve on boiler.
• Plug boiler into an electrical socket.
• Turn boiler on using ON/OFF switch.
• Set controls (thermostats, control system) to generate a
call for heat.
• Start-up cycle begins, this cannot be interrupted.
During start-up cycle, display shows following information:
A short test where all segments of the display are visible.
Fxx
: Software version
Pxx
: Parameter version. Version numbers are displayed
alternately.
• Air purge cycle is automatically carried out for 3 minutes.
9.8 Before Gas Conversion
When converting from natural gas (A) to propane gas (E),
before calibrating gas valve, replace venturi assembly (B) as
indicated in figure 9-2.
Disconnect gas pipe (threaded nut "C") and remove three
screws securing the flange.
Verify there are no gas leaks.
9 - START UP PROCEDURE
Natural Gas
Propane
Venturi
Nozzle
Venturi
Nozzle
in
mm in
mm
in
mm
in
mm
1
³
/
₁₆
30
⁷/₃₂
5.3
1.18
30
⁵/₃₂
4
9.9 Gas Conversion (Propane)
Boiler is preset to operate on natural gas (A).
For operation with propane gas, carry out following:
1.
Activate "Calibration function" to set boiler to operate on
full load and on part load in Heating mode.
2.
Adjust Fan Speed as indicated in table found in section
"Parameter Settings" (if required).
3.
Modify fan speeds using parameters
P17
,
P18
and
P19
.
4.
Set air/gas ratio (O
2
/CO
2
%): Full load and Part load as
describe below.
5.
Use combustion analyzer to properly set gas valve.
6.
Allow time between adjustments for your combustion
analyzer to sense adjusted CO
2
/O
2
level. This function
is interrupted if the central heating supply temperature
reaches its MAX. SETPOINT.
To measure combustion efficiency and emissions of products of
combustion, boiler has two dedicated built in test ports.
One connection port is connected to exhaust flue (A), and
allows monitoring of the quality of combustion products and
combustion efficiency.
Other is connected to combustion air intake (B), used to check
for recycling products for combustion.
The following can be measured at exhaust flue test port:
• temperature of combustion products
• oxygen (O
2
) or carbon dioxide (CO
2
) concentration;
• carbon monoxide (CO) concentration.
The temperature of combustion air must be measured on the
air intake test port (B) by inserting the measurement sensor
approximately 3-3/16" (80.00 mm) (C) for the UCS-240.
FIGURE 9-6 Venturi and Nozzle
FIGURE 9-7 Combustion Air Temperature Ports
P/N 240011654, Rev. C [06/08/2017]
