62
FIGURE 9-3 - GAS INLET AND NOZZLE
9 - START UP PROCEDURE
9.10 Combustion Adjustment
To measure combustion efficiency and emissions of products
of combustion, boiler has two dedicated built in test ports. See
Figure 9-4.
Use combustion analyzer to properly set gas valve.
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, or 25 minute timeout.
One connection port is connected to exhaust flue (A), and
allows monitoring of the quality of combustion products and
combustion efficiency.
Other port is connected to combustion air intake (B*), used to
check for recycling products for combustion.
The following can be measured at the 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).
* (B) Port is blocked off on 160 Models if using a 2 pipe vent
conversion kit. Field source a test port.
FIGURE 9-4 COMBUSTION AIR TEMPERATURE PORTS
Orifice
Gas Inlet
FIGURE 9-5 GAS VALVE
(Throttle)
(Offset)
Nut
Nut
Gas Pipe
P
: OFFSET measurement pressure tap
Pi
: Gas supply tap
Pout
: Burner gas pressure tap
V
: Gas flow adjustment screw
K
: OFFSET adjustment screw
(Exhaust)
*(Intake)
PN 240012363 REV. A [08/31/2018]
