50
9.9 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 9-3.
Disconnect gas pipe (threaded nut "C") and remove three
screws securing the flange.
Verify there are no gas leaks.
9.10 Gas Conversion (Propane)
Boiler is preset to operate on natural gas (A).
For operation with propane gas, carry out following:
1.
Change venturi assembly per LP conversion kit
instructions.
2.
Change
PO2
to "
01
".
3.
Adjust Fan Speed
P70
,
P71
and
P72
as needed. Note
changing
PO1
does not change
P70
,
P71
,
P72
, each
must be changed separately.
See Section 10.3.6
4.
Modify fan speeds using parameters
P17
,
P18
and
P19
.
5.
Set air/gas ratio (O
2
/CO
2
%): Full load and Part load as
described below.
6.
Use combustion analyzer to properly set gas valve.
7.
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
GMHB227
port (B) is blocked off if using a 2 pipe vent
conversion kit.
Model
Natural Gas
Propane
Venturi
Nozzle
Venturi
Nozzle
in
mm in mm
in
mm
in mm
GMHB227
1
³
/
₁₆
30
⁷/₃₂
5.3 1.18
30
⁵/₃₂
4
GMHB380
1
1/2
38
3/8
9.5
1
1/2
38
3/16
5
FIGURE 9-4 Venturi and Nozzle
FIGURE 9-3 Gas Valve
FIGURE 9-5 Combustion Air Temperature Ports
PN 240012369, REV A [08/31/2018]
9 - START UP PROCEDURE
Содержание GMHB227
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