Maintenance

Remote Air-Cooled Condenser

of the fans are constant speed and are cycled separately using ambient sensing thermostats.

Flooded Head Pressure Control Valve (FHP)

The FHP system of head pressure control is a completely automatic control that maintains a preset condenser pressure without need of seasonal adjustment. The control maintains head pressure by backing liquid into the leaving side of the condenser, decreasing the effective condenser surface and therefore maintaining a constant head pressure upon a drop in ambient temperature.

Several styles of flooding valves or combinations of valves are available. Contact the valve manufacturer for specific recommendations.

Operation:

During normal ambient operation, the valve allows liquid refrigerant to flow through C port (see Figure 9) and R port to the liquid receiver.

Figure 9.

*If receiver is located in a warm ambient, a check valve in this location may be required to prevent receiver gas from migrating into the condenser during the off cycle.

As the pressure drops with a drop in ambient temperature, the valve opens to allow high pressure discharge gas to enter B port, pass through the valve and pressurize the receiver to provide adequate liquid flow to the expansion valve.

(see Figure 10)

This action raises the pressure on the discharge side of the condenser, reducing flow and flooding the leaving side of the condenser until the pressure rises to a proper level to close B port. The liquid receiver size is important in this type of control and must be large enough to hold the total system charge. If the receiver is not large enough, the liquid will be stored in the condenser causing high head pressure at normal ambient temperatures.

Figure 10.

The refrigerant charge required will often be about two times the normal charge for cold weather operation. The amount of refrigerant that must be added to a system for winter or cold weather operation is determined by Tables 6, 7 and 8.

(see page 10)

Piping:

As on all systems, refrigerant migration must be prevented when using FHP. If the receiver is in a warm location, a check valve should be placed in the line between the FHP valve and the receiver. Good piping practice suggests a trap in the compressor discharge line and an inverted trap at the condenser outlet. Multiple valve applications must have valves piped in parallel.

Air-cooled condensers require minimum maintenance. The unit coil will require a periodic cleaning and this can be accomplished by a brush, vacuum cleaner, pressurized irstream or a commercially available coil cleaning foam.

All of the condenser fan motors have sealed ball bearings. The only acceptable service to these bearings is replacement.

Cleaning Instructions

Heatcraft recommends that the finned surface of this unit be cleaned approximately every six months; more frequent cleaning may be required if extreme conditions cause clogging or fouling of air passages through the finned surface.

Calgon Corporation’s CalClean 41352 (or equal) should be acceptable for cleaning this unit. CalClean should be applied liberally to entering air and leaving air surfaces of the finned area in accordance with the label directions.

CAUTION: Under no circumstances should this unit be cleaned with an acid-based cleaner.

Remote Air-Cooled Condenser Installation and Operations Manual, August 2007

2500018 specifications

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