Camus Hydronics VTech Series Installation And Service Manual
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Contents
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17VT299 to VT399 – Negative Pressure Control ValveVT499 – Negative Pressure Control Valve4.4 – Gas Pressure SwitchesGas pressure switches prevent the burner from being activatedif pressure is outside certain ranges. Each switch is a physicalmanual reset device, requiring physical depression of the resetbutton if it is not closed prior to burner start or during burneroperation.4.4.1 – Low Gas PressureA low gas pressure switch is standard equipment and monitorsthe minimum incoming gas supply pressure supplied to the gastrain. If gas pressure upstream of the valve(s) falls below theminimum setting of the pressure switch, the switch will open andthe appliance will shut down. An open gas pressure switch alarmwill be shown on the display.4.4.2 – High Gas PressureHigh gas pressure switches may be ordered to comply with CSD-1 code. These will either be integrated in to the gas train. If gaspressure downstream of the gas valve(s) exceeds the maximumsetting of the pressure switch, the switch will open and theappliance will shut down.Gas Pressure Switch (Cover Removed)4.5 – Air Pressure Switches4.5.1 – Blocked Flue SwitchAll models use a normally closed blocked flue switch to shutdown the appliance under the following conditions: Air intake 50% blocked Vent outlet 80% blocked4.5.2 – Low Air SwitchThe low air switch is closed by operation of the combustion airblower, to confirm that there is air flow present. This switch isadjustable but typically does not need to be altered from factorysettings. Once this switch is closed the unit initiates the pre-purgecounter. If this switch opens during operation the unit will lock-out.4.6 – Combustion Air BlowerThe VTech use a modulating air fan to provide combustibleair/gas mix to the burner and push the products of combustionthrough the heat exchanger and venting system. The fanassembly consists of a sealed housing and fan wheelconstructed from spark resistant cast aluminum. The fan isoperated by a fully enclosed 120 VAC, Single-Phase EC/DCelectric motor. The fan housing and motor assembly is fullysealed and SHOULD NOT be field serviced. The power draw ofthe motor is proportional to the modulated gas input rate of theappliance.VTech Combustion Air Fan4.7 – BurnerThis appliance uses a single cylindrical burner installed verticallyinto the combustion chamber at the top of the heat exchanger.The burner consists of a round mounting flange welded to amixing tube. The flange provides the transition from thecombustion air fan into the burner. The mixing tube is coveredwith a knitted alloy material that forms the burner port surface.The knitted burner port material is a metal fiber material which isa unique alloy of iron, chrome, aluminum and several rare earthmetals. This alloy is designed to operate stress free as a burnerport surface. The burner port surface can sustain operation froma blue flame down to infrared conditions as the burner inputvaries.VTech BurnerHigh-fire air gas ratioadjustment (Use slottedscrewdriver foradjustment, counter-clockwise increases CO2)Low-fire air gas ratioadjustment (use Torx 40for adjustment clockwiseincreases CO2)Low-fire air/gas ratioadjustment, use slottedscrewdriver for adjustment,clockwise increases CO2Gas InletLift top cover to accesshigh fire air/gas ratioadjustment (use 3mmAllen key for adjustment,counter-clockwiseincreases CO2) |
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