Camus Hydronics DFH/W500 Installation, Operation And Service Manual page 56

To adjust the low-fire setting (DF 2000 – 6004)
Figure 37: 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 DynaFlame 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 min fire
for 5 minutes.
Low Fire
Adjustment
When the correct combustion values are achieved replace
the screw cap back on to the gas valve.
To reset the trim valve to factory settings refer to the chart
below and the step-by-step instructions that follow.
51
Increase CO2 Decrease CO2
Counter-
Clockwise
Clock Wise
Table 16: Inline trim valve setting
LP Gas
(Propane)
Model
# of Turns
Clockwise
DF 500 3 1/2
DF 750 3
DF 1100 3
DF 1200 3
DF 1500 4
DF 1750 4
DF 2000 3 3/4
DF 2500 3 5/8
DF 3000 4
DF 3500 5 3/4
DF 4000 5 7/8
DF 4500 7 3/4
DF 5000 7 3/4
DF 6000 7 3/4
Step 1: Fully open inline metering valve (counter-
clockwise)
Step 2: Close inline metering valve to preset level
Step 3: Above table shows initial settings only, fine-tuning
will be required with the use of an analyzer
•
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 4-20mA 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. Normally the differential gas
pressure will be identical to the differential air pressure.
Actual differential pressure may vary from the numbers
on the test label due to the field conditions and sample
variations. Always make adjustments to meet the
recommended CO levels. Adjust high fire first followed
2
by low fire adjustment.
•
Allow the water temperature to rise so that the heater
cycles on the operator.
•
Check the temperature rise across the heat exchanger.
For hydronic applications and for domestic hot water, a
rise exceeding 30ºF is not normally recommended.
•
Stainless Steel Heat Exchanger: Allow the unit to
cycle on the limit. This can be done by gradually
restricting outlet water flow. The auto reset limits are
set at 210ºF for domestic hot water and hydronic
heating
•
Copper, Copper-Nickel Heat Exchanger: Allow the
unit to cycle on the limit. This can be done by gradually
restricting outlet water flow. The auto reset limits are
set at 200ºF for domestic hot water and 230ºF for
hydronic heating utilizing a copper heat exchanger. In
addition the heaters are equipped with a manual reset
high limit set at 210ºF for domestic hot water and
250ºF for hydronic heating.
Natural Gas
VFD Hz (High Fire)
# of Turns
Clockwise
2 1/2
1 1/2
1 1/2
1 1/2
3
3
2 1/2
Consult Factory
Test Sticker
2 7/8
3
4
5
5
5
5