Cornelius I Series Wartungshandbuch PDF herunterladen (Seite 49)

46TD 204

Head Pressure Control Valve

[Headmaster]/Fan Cycle Switch

(Remote Units Only)

discharge

receiver

condenser

above 70°F

normal

dis-

charge

receiver

condenser

below 70°F by-pass

The Cornelius “I” series remote systems use an Alco Head Pressure

Control, normally referred to as a headmaster. This control is

mounted in the remote condenser with a fan cycling control switch.

Using both these controls gives the system positive operation under

a wide range of condensing temperatures.

The fan cycling switch starts the fan at 270 PSI (18.62 Bars) and stop

it at 205 PSI (14.13 Bars) allowing a positive efficient operation at

the high temperature operating ranges.

The headmaster controls the operation when the condensing tem-

perature drops below 21.1°C. The “I” series refrigerant charge is

HP - 62 [R - 404A] and the headmaster dome charge setting is 200

PSI (13.79 Bars) of nitrogen pressure making it stable under the low

temperature operating range down to - 29°C. (Continued on page

46).

The normal flow pattern through the headmaster is from the con-

denser port to the receiver port. When this flow pattern is unable to

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Cornelius I Series Wartungshandbuch Seite 49