Camus Hydronics DRW1000, Installation And Service Manual

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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 100.0%
4) Press
[Start Test] to operate the boiler at max fire for
5 minutes.
Figure 35: DR3500 – 5000 Gas Train Layout
Locate the metering valve on the gas train.
Increase CO2 Decrease CO2
High Fire
Adjustment
Counter-
Clock Wise
Clockwise
Turn the screw 1/8 turn in either way for each adjustment to keep
track of the adjustments. 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 reset the metering valve to factory settings refer to the chart
below and the step-by-step instructions that follow.
Table 15: Inline metering valve setting
Model
LP Gas (Propane) Natural Gas
# of Turns Clockwise # of Turns Clockwise
DR 2000 3 3/4 2 1/2
DR 2500 3 5/8 2 7/8
DR 3000 4 3
DR 3500 5 3/4 4
DR 4000 5 7/8 5
DR 4500 7 ¾ 5
DR 5000 7 3/4 5
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
2
levels. Adjust high fire first followed 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.
This will be indicated by taking a difference between the
inlet and outlet temperatures on the Dynaforce® control.
For hydronic applications and for domestic hot water, a rise
exceeding 40ºF is not recommended.
• 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 hydronic
heating. The manual reset limits are set to 210 o F.
• Remove fan inlet filter. At full input, block 50% of the fan
inlet opening. The display should show ‘LCI not closed’. If it
does not, slowly turn the adjustment on the normally closed
blocked flue switch clockwise until the blocked flue switch
indicator de-energizes.
•
Check the air proving switch. Remove the restriction from
the fan inlet and reset the power on the control panel. A
properly set air switch will cause the interrupted air switch
indicator to turn green at a fan speed between 15Hz and
20Hz on the VFD.
• Check the ignition retries circuit.
• Shut the main gas off to the unit and allow it to try for
ignition. Trial for ignition should commence within 30
seconds.
8.4 COMISSIONING APPLIANCE
• Remove manometers and replace inlet gas pressure test
plug.
• Fill out start up report for each heater. Be sure to record all
settings and readings. Retain a copy of report for future
reference.
•
Start up is now complete and heater may be placed into
service.