Camus Hydronics DRH300 Installation, Operation And Service Manual page 53

Figure 33: DR 500 - 1800 Gas Valve
Lift top cover to access high fire
air/gas ratio adjustment
(use 3mm allen key for adjustment,
counter-clockwise increases CO
Low fire air/gas ratio adjustment
(use T-40 for adjustment,
clockwise increases CO
To adjust the low fire setting (DR 300 – 1800)
Use the Dynaforce® Control Panel:
1) Press [DIAGNOSTICS] button
2) Press [Diagnostic Tests] button
3) Move the firing rate slider to 1600 RPM
4) Press [Start Test] to operate the boiler at max fire for
5 minutes.
The Dynaforce® should respond immediately and fire at 1600
RPM. When this is achieved locate the low fire adjustment
screw as illustrated in Figure 30 and 31.
Low Fire
Adjustment
When the correct combustion values are achieved replace the
screw cap back on to the gas valve.
•
This boiler is designed for low fire soft start. At the start of
trial for ignition the fan will decelerate to minimum fire and
will light off at low fire before ramping up towards full input
through the PWM signal from the controller.
•
Shut power off to the heater and open the firing valve.
Switch power back on and allow the burner to fire. Ignition
should be smooth. Always make adjustments to meet the
recommended CO levels. Adjust low fire first followed by
2
high fire adjustment.
To adjust the high-fire setting (DR 300 – 1800)
After the low fire settings are stable, ramp the boiler firing rate
to 100% using the boiler control and bring the system
temperatures up to 130F or to highest system design
temperatures to minimize or eliminate condensate.
Use the Dynaforce® Control Panel:
1) Press [DIAGNOSTICS] button
2) Press [Diagnostic Tests] button
3) Move the firing rate slider to maximum RPM as
indicated by the test sticker
4) Press [Start Test] to operate the boiler at max fire for
5 minutes.
Locate the input adjustment screw on the top side of the gas
valve.
)
2
)
2
Gas Inlet
Increase CO2 Decrease CO2
Counter-
Clockwise
Clock Wise
High Fire
Adjustment
After adjusting the screw wait a moment for the
combustion levels to stabilize before attempting to make
any further adjustments. Continue this procedure until
combustion levels are satisfied.
To adjust the low-fire setting (DR 2000 – 5000)
Figure 34: SKP 55 Gas Valve
1 Adjustment of low fire bias
2 Connection for air pressure (+) sensing line
3 Connection for the air pressure (-) sensing line
4 Connection for the gas pressure (-) sensing line
5 Connection for the gas pressure (+) sensing line
6 Position indicator
Use the Dynaforce® Control Panel
1) Press [DIAGNOSTICS] button
2) Press [Diagnostic Tests] button
3) Move the firing rate slider to 20.0%
4) Press [Start Test] to operate the boiler at max
fire for 5 minutes.
Low Fire
Adjustment
When the correct combustion values are achieved replace
the screw cap back on to the gas valve.
Increase CO2 Decrease CO2
Counter-
Clockwise
Clock Wise
Increase CO2 Decrease CO2
Counter-
Clockwise
Clock Wise
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