Camus Hydronics DRW1000, Инструкция по установке и обслуживанию

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PART 8 FIELD STARTUP
PROCEDURE
8.1 CHECKING THE INSTALLATION
•
Inspect the connections for water, gas and electricity.
• Confirm that water is being pumped toward the heat
exchanger inlet. Never pump away from the exchanger
since this will result in a low-pressure zone, which will allow
localized boiling and result in heat exchanger damage.
• Power to the boiler and pump must be from the same circuit
to prevent the boiler firing in case the pump is inadvertently
shut off.
•
Inlet gas pressure must be a minimum of 3” W.C. for natural
gas and 11” W.C. for propane.
•
With the boiler off, open the main gas supply valve and vent
the trapped air from the piping leading to the boiler. Confirm
that all gas connections to the heater are tight and that there
are no missing test plugs.
•
DR2000 – 5000: Connect a manometer to obtain the
differential air pressure between negative and positive
ports, see Figure 10.
• The air/gas ratio controller automatically adjusts to match
the air signal on the gas side. In this way true mass flow
control of air/gas mix is achieved. All boilers are test fired
and factory set. A test sticker with actual reading is affixed
to the unit.
8.2
CHECKING THE CONSTRUC
TION
• Check the boiler wiring to see that it agrees with the wiring
diagram supplied.
• Confirm that all terminal strips and field connections are
identified.
• Confirm that the Dynaforce® controller is set in the proper
mode. Auto reset limits are fixed in all modes.
•
With the firing valve in the off position, switch on power to
the boiler. The fan motor will accelerate until the airflow icon
becomes green.
• Once all lights past the STAT are green the SOLA will try
for ignition. When the igniter is hot enough, the gas valve
actuator is energized and if ignition is accomplished the
Burner State will show “Run”. If ignition is not accomplished,
the Burner State will show “Safe Startup” and two more
ignition trials will be made 15 seconds apart. The control will
then proceed to lockout and must be reset by momentarily
interrupting power. It is normal during initial start up, when
air is being purged from the piping, to require two to three
tries before successful ignition.
•
With the boiler running, check for flue gas leaks along the
inner cabinet joints and around the flue outlet.
•
Repair any leaks prior to the next step.
•
At the factory adjustments were made to achieve proper
input and acceptable burner performance at full input and
at minimum input.
• Depending on field conditions, the CO
2
metering valve may
require some minor adjustment at full input. Refer to Table
14. Adjustment at minimum input can be done at the low fire
adjustment screw by first removing the brass cap. Turning
adjustment screw clockwise will increase CO
2
.
8.3 GAS VALVE ADJUSTMENT PROCEDURE
Table 14: Combustion Values
Dynaforce® Combustion Values
Natural Gas Propane
CO
2
CO CO
2
CO
Max.
Fire
8.5% - 9.0% <100
PPM
9.5% - 10.0%
<100
PPM
Min.
Fire
8.0% - 8.5% <100
PPM
9.0% - 9.5%
<100
PPM
If adjustment of the gas valve is required use the following
procedure.
It is imperative that the coldest system water temperature
possible is used when setting up low fire combustion. These cold
system temperatures create large amounts of flue condensate
resulting in large amounts of condensate build up on the
stainless steel finned heat transfer tubes. These conditions
create the highest back pressure through the boiler and makes
for the most critical combustion set up point when running 20%
input. This set up must be achieved quickly to ensure low system
temperatures are maintained throughout the set up of single or
multiple boiler installations.
Light off the boiler at low fire and make the initial adjustment to
the low fire bias to obtain the specified CO2, CO, at 20% gas
input.
While maintaining the lowest possible water temperature,
observe the differential gas pressure. The differential gas
pressure must not drop below a minimum of 0.25” w.c. If
necessary increase the VFD (Hz) setting until this pressure is
met. Once the boiler has run for at least 10-15 minutes with dead
cold water, there should be a maximum amount of condensate
in the lower heat exchanger. At this point adjust the combustion
for CO2.
The boiler must continue to run with stable combustion without
making any howling noise which usually happens from an overly
rich mixture. Once settings are complete at low fire, continue to
run the machine for at least 10-15 more minutes and record the
final low fire input and the combustion data.
To ensure the coldest possible water temperatures for set up on
multiple boiler systems, the low fire combustion should be
established on all boilers before setting any boiler high fire
combustion rates.
In order to perform adjustments to the gas valve the
Dynaforce® must be firing before proceeding.
Figure 32: DR 300 – 400 Gas Valve
High fire air/gas ratio adjustment
(use slotted screwdriver for
adjustment, counter-clockwise
increases CO
2
)
Low fire air/gas ratio adjustment
(use T-40 for adjustment,
clockwise increases CO
2
)