CeilAir CW series Instrukcja Operatora Pobierz pdf (Strona 17)

(©July, 2008)

CeilAiR OHS Series Installation, Operation & Maintenance Manual

ir Technology Systems, Inc.

2-6

2.5.2 Ducted Systems (See Figure 3)

There are three basic configurations of airflow patterns: 90º/Right Angle, Straight-Thru and In/Out Same-Face.

When determining ducting requirements, always consult your local and state codes. The duct system should be

designed to allow the air to move with as little resistance as possible. Several factors determine ducting material

and size. These factors are predetermined, refer to your ducting system schematic.

The connection of ducting to the unit is typically accomplished with a one-inch duct flange. Supply air outlet and

return air inlet ducts will require a field provided duct flange (refer to the installation drawing provided with the unit).

The connection of ductwork to the unit may be made with either pop rivets or self-tapping screws.

2.6 Piping Connections

2.6.1 Refrigerant

2.6.1.1 Self-Contained Systems

No refrigeration connections are required for self-

contained air, water or glycol-cooled systems (Models

OHS-012/040-AS, OHS-012/120-C and OHS-012/120-

W/G-( )).

2.6.1.2 Split Systems

Split air-cooled systems will require field refrigeration

piping. All split systems are shipped with a dry

nitrogen charge of 50 psig.

2.6.1.2.1 Remote Air Cooled Condensers

(AR Models)

Systems utilizing air cooled condensers must not have

a refrigerant line pressure drop over 14 psig across the

condenser and the interconnecting piping to the

condenser sections.

If the condenser is installed above the evaporator, the

discharge line should include a P-trap at the evapora-

tor.

Figure 3- Ducted System Typical Air Patterns

NOTE

Ensure proper condenser selection to maintain

reasonable subcooling temperatures.

If the condenser is installed below the evaporator, an

inverted trap the height of the evaporator coil is required

on the liquid line to help prevent oil and liquid from

flooding back to the compressor during off cycles.

Refer to the Recommended Discharge Line and

Recommended Liquid Line sizing tables on page 2-7.

All refrigeration piping should be installed with high

temperature brazed joints. Use standard refrigeration

practices for piping supports, leak testing, dehydration

and charging of the refrigeration circuits. The refrigera-

tion piping should be isolated from the building by the

use of vibration isolating supports. To prevent tube

damage when sealing openings in walls and to reduce

vibration transmission, use a soft flexible material to

pack around the tubes.

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