Installation manual

Glycol Cooled/GLYCOOL™ Models

4.0 GLYCOL COOLED/GLYCOOL™ MODELS

4.1 Drycooler Location

4.1.1 Outdoor Prop Fan Models

The drycooler should be located for maximum security and maintenance accessibility. Avoid ground-

level sites with public access or areas that contribute to heavy snow or ice accumulations. To assure

adequate air supply, it is recommended that drycoolers be located in a clean air area, away from loose

dirt and foreign matter that may clog the coil. In addition, drycoolers should not be located in the

vicinity of steam, hot air or fume exhausts. Also, drycoolers should not be located closer than 3 feet (1

meter) from a wall, obstruction or adjacent unit.

4.1.2 Indoor Piggyback Models

The Piggyback drycooler can be located directly behind the Deluxe unit or in a separate remote indoor

location. It may be placed directly against an outside wall, with the proper openings cut in the wall for

entering and leaving air. If it cannot be located near a wall, the unit may be ducted to the outside.

Proper grills/screens are required on the outside wall.

4.2 Drycooler Installation

For roof installation, mount drycoolers on steel supports in accordance with local codes. To minimize

sound and vibration transmission, mount steel supports across load bearing walls. For ground instal-

lation, a concrete pad will provide adequate support. Drycooler legs have mounting holes for securing

the drycooler to steel supports or concrete pad.

4.3 Electrical Connections

4.3.1 High Voltage

High voltage electrical service is required for all drycoolers at the location of the drycooler. This power

supply does not have to be the same voltage as the indoor unit. This separate power source may be

208, 230, 460 or 575 Volt 60 Hertz; or 200, 230 or 400 Volt 50 Hertz. The disconnect switch is factory

supplied and mounted in the electric panel.

4.3.2 Low Voltage

A control interlock between the drycooler and the indoor unit is required and is connected between 70

&71 on the wire raceway in the compressor compartment of the indoor unit and the pump and dry-

cooler control box of the drycooler.

4.3.3 Pump And Drycooler

All wiring to the pump and drycooler from the control box should be done in accordance with the elec-

trical schematic on the inside lid of the drycooler control box and with local and national codes (on

Piggyback Models, the pump is located within the drycooler).

4.4 Glycol Piping

Manual shut-off valves should be installed at the supply and return line to each indoor unit and dry-

cooler. This will provide for routine service or emergency isolation of the unit.

To provide for the emergency of water leaks and the consequences of subfloor flooding, floor drains

should be provided with wet traps or a water detection system such as a Liqui-Tect that should be

installed near the base of the unit or below the elevated floor.

The temperature of the glycol supplied by the drycooler will determine whether the glycol supply and

return lines should be insulated to prevent condensation.

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