Camus Hydronics DRW1000, Инструкция по установке и обслуживанию

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3.6 GAS MANIFOLD DIFFERENTIAL PRESSURE
ADJUSTMENT (DR2000 – DR5000)
Tampering with gas valve adjustments after startup and
commissioning will void the warranty on the gas valve assembly
and the burner.
The appliance’s manifold gas pressure
IS NOT
field adjustable
after startup and commissioning. The gas valve pressure ratios
have been factory set with an internal bias adjustment to ensure
a 1:1 air/gas ratio on operation. Tampering with this adjustment
will void the warranty on the gas valve assembly and the burner.
An appliance supplied with a properly sized gas line, properly
sized meter and a minimum gas supply pressure (See Table 7
for minimum allowable inlet gas supply pressure) while firing at
full rate will ensure full burner input. The manifold pressure
supplied to the burner is a differential pressure. This pressure is
the result of the difference in two gas pressure measurements.
A differential manifold gas pressure measurement should not be
made until you have measured the gas supply pressure. Gas
supply pressure must be at least at minimum allowed with all
appliances on the gas line firing at full rate before a manifold
pressure measurement is made. Use the following procedure to
check gas supply pressure with a manometer connected to the
inlet pressure tap on the gas line connection at the rear of the
appliance.
3.7 CHECKING GAS SUPPLY PRESSURE
• Turn the main power switch to “OFF” position.
•
Shut off gas supply at the manual gas cock in the gas piping
to the appliance. If fuel supply is LP gas, shut off gas supply
at the tank.
• Models 300 – 3000: Remove the 1/8" hex plug from the gas
pressure test port located on the inlet gas supply
connection at the rear of the appliance. Install a fitting in the
inlet pressure tapping suitable to connect to a manometer
or magnahelic gauge. Range of scale should be 0 to 14 inch
W.C. or greater to check inlet pressure
•
Models 3500 – 5000:
Remove the 1/8” hex plug
downstream of the SKP25. Install a fitting in the inlet
pressure tapping suitable to connect to a manometer or
magnahelic gauge. Range of scale should be 0 to 14 inch
W.C. or greater to check inlet pressure
•
Turn on gas supply at the field installed manual gas cock;
turn on LP gas at tank if required.
•
Turn the power switch to “ON” position.
• Adjust the thermostat set point to call for heat.
•
Observe the gas supply pressure as the burner fires at
100% of rated input.
• Ensure inlet pressure is within specified range. Minimum
and maximum gas supply pressures are specified in Table
7.
•
If gas pressure is out of range, contact the gas utility, gas
supplier, qualified installer or service agency to determine
necessary steps to provide proper gas pressure to the
control.
•
If gas supply pressure is within normal range, proceed to
remove gas manometer and replace pressure tap fittings in
the gas piping to the appliance.
• Turn on gas supply at the manual valve; turn on LP gas at
tank if required.
• Turn the power switch to “ON” position.
•
Adjust the thermostat temperature set point to the desired
water temperature so the appliance will call for heat.
•
Check appliance performance by cycling the system while
you observe burner response. The burner should ignite
promptly. Flame pattern should be stable, see
“Maintenance-Normal Flame Pattern.” Turn system off and
allow burner to cool, then cycle burner again to ensure
proper ignition and flame characteristics.
IMPORTANT
Upon completion of any testing on the gas system, leak test all
gas connections with a soap solution while the main burner is
firing. Immediately repair any leak found in the gas train or
related components. DO NOT operate an appliance with a leak
in the gas train, valves or related gas piping.
3.7.1 Regulated Gas Supply Pressures for Dynaforce®
Boilers & Water Heaters
A stable gas supply pressure is important to avoid rough starts
with machines like the Dynaforce® which use a 1 to 1 ratio
control valve for internal gas pressure regulation.
Camus® requires that all Dynaforce® models equipped with the
SKP25 be supplied with no more than 1 PSI incoming supply
pressure. This means that lockup pressure must not exceed 1
PSI. For models NOT incorporating the SKP25, lockup pressure
must not be in excess of 14” w.c.
A suitable lockup regulator with internal or external relief will not
exceed running pressure by more than 20%.
When required a final stage gas regulator is to be located as
close as possible but no more than 10 feet from the appliance.
It is paramount that maximum lockup pressure be confirmed
before any attempt is made to start up the appliance.
Operating the Dynaforce® at lockup pressures exceeding the
recommended levels can lead to delayed ignitions and damage
to the appliance.
3.8 CHECKING DIFFERENTIAL AIR AND GAS
PRESSURES (DR2000 – DR5000)
Figure 12: Checking Differential Air and Gas Pressures
(DR2000 – DR5000)
• The 1 to1 air/gas ratio control actuator has embossed
markings ident air, – air, + gas & - gas connections.
Using a test hose assembly fitted with tees, connections
can be made from the manometer to the appropriate ports
on the actuator.
• Using tees connect a hose from the positive air and the
negative air to each of the two sides of a manometer. This
will allow the two pressure points to be measured while at
the same time the actuator still receives the proper
operating signal.
Fan Inlet
Firing
Valve
Metering
Valve
Differential High
Gas Switch
Control Valve
Regulator Valve
Main Manual
Valve
Low Gas Switch
To Fan Discharge
To
Appliance
Vent