CeilAir CW series Návod k obsluze stáhnout pdf (Strana 36)

(©July, 2008)

CeilAiR OHS Series Installation, Operation & Maintenance Manual

ir Technology Systems, Inc.

The normal control setting is 50-55 psig (suction

pressure) read from the suction (low) side of the

compressor as it operates in full hot gas bypass

operation. The valve is factory set and no adjustment

should be necessary. If adjustment is required, block

one half of the coil and remove adjustment cap from

end of valve. Using a 5/16 inch Allen wrench, turn

clockwise to increase pressure or counterclockwise to

lower pressure.

2.9.8.2 Full Floating Hot Gas Bypass

A full floating hot gas bypass system is provided for

capacity control and freeze protection. The hot gas

bypass system may include a quench solenoid valve,

a quench solenoid coil, a quench expansion thermal

valve, a hot gas (discharge) solenoid valve, a hot gas

(discharge) solenoid coil, and a hot gas bypass valve.

To ensure a constant running compressor, the hot gas

and quench solenoid valves are open and the liquid line

solenoid valve cycles on the demand of the controller.

The hot gas bypass valve allows refrigerant to flow from

the discharge line directly to the suction line. The hot

gas bypass entering the suction side of the compres-

sor would raise the operating temperature of the

compressor to a point where failure could occur. To

prevent overheating of the compressor, a small amount

of liquid refrigerant passes through the quench valve

and mixes with the hot gas entering the compressor,

maintaining normal compressor suction pressure and

temperature.

The full floating hot gas bypass system provides freeze

protection for the evaporator coil by limiting the

minimum refrigerant pressure, preventing the surface

temperature of the evaporator coil from dropping below

32°F. The hot gas (discharge) regulating valve has a

normal control setting at 50-55 psig (suction pressure)

read from the suction (low) side of the compressor as

it operates in full hot gas bypass operation. The valve

is factory set and no adjustment should be necessary.

If adjustment is required, remove the adjustment cap

from end of the valve. Using a 5/16 inch Allen wrench,

turn clockwise to increase pressure or counterclock-

wise to lower pressure.

CAUTION

Do not exceed 20°F superheat. Exceeding this

temperature may cause failure of the compres-

sor.

The quench valve normal control setting is 20°F

superheat (when there is no call for cooling). The valve

is factory set and no adjustment should be necessary.

If adjustment is required, remove adjustment cap from

the valve. Turn the adjusting stem clockwise to

increase superheat and counterclockwise to decrease

the superheat.

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