Emerson Liebert DS Bedienungsanleitung PDF herunterladen (Seite 25)

Guide Specifications

2.4 Humidifier

A humidifier shall be factory-installed inside the

unit. Bypass air slots shall be included to enable

moisture to be absorbed into the air stream. The

humidifier capacity shall be ____lb./hr (kg/hr). The

humidifier shall be removable from the front of the

cabinet.

2.4.1 Infrared Humidifier

The humidifier shall be of the infrared type consist-

ing of high intensity quartz lamps mounted above

and out of the water supply. The humidifier pan shall

be stainless steel and arranged to be removable with-

out disconnecting high voltage electrical connections.

The complete humidifier section shall be pre-piped,

ready for field connection to water supply. The

humidifier shall be equipped with an automatic

water supply system and shall have an adjustable

water-overfeed to prevent mineral precipitation. A

high-water detector shall shut down the humidifier to

prevent overflowing. A factory-provided air-gap shall

prevent backflow of the humidifier supply water.

2.4.1 Steam Generating Canister Humidifier

A canister-type steam canister shall be factory-

installed in the cooling unit and shall be controlled by

the microprocessor control system. It shall be com-

plete with disposable canister, all supply and drain

valves, steam distributor and electronic controls. The

need to change canister shall be indicated on the

microprocessor control panel. The humidifier shall be

designed to operate with water conductivity from

200-500 micromhos. An air-gap within the humidifier

assembly shall prevent backflow of the humidifier

supply water.

2.5 Reheat

The environmental control unit shall include a fac-

tory-installed reheat to control temperature during

dehumidification.

2.5.1 3-Stage Electric Reheat

The electric reheat coils shall be low watt density,

304/304 stainless steel fin tubular construction, pro-

tected by thermal safety switches, shall be ____ kW

(____ BTUH) controlled in three stages. The reheat

elements shall be removable from the front of the

cabinet.

2.5.1 SCR Electric Reheat

The electric reheat coils shall be low watt density,

304/304 stainless steel fin tubular construction, pro-

tected by thermal safety switches, ____ kW (____

BTUH) controlled by multiple pulses to achieve tight

temperature control. The reheat elements shall be

removable from the front of the cabinet.

2.5.1 Hot Water Reheat

The hot water reheat coil shall have copper tubes and

aluminum fins with a capacity of ____ BTUH (kW)

when supplied with ____ °F (°C) entering water tem-

perature at ____ GPM (l/s) flow rate. Maximum pres-

sure drop shall be ____ psi (kPa). The hot water

reheat control system shall be factory pre-piped with

a two-way modulating control valve and cleanable

Y-strainer.

2.6 Dual Refrigeration System

Each unit shall include two (2) independent refriger-

ation circuits and shall include hot gas mufflers

(semi-hermetic compressors units only), liquid line

filter driers, refrigerant sight glass with moisture

indicator, externally equalized expansion valves and

liquid line solenoid valves. Compressors shall be

located outside the airstream and shall be removable

and serviceable from the front of the unit.

2.6.1 Scroll Compressors

The compressor shall be scroll-type. The compressor

shall be suction gas cooled motor, vibration isolators,

thermal overloads, automatic reset high pressure

switch with lockout after three failures, rotalock ser-

vice valves, pump down low pressure transducer, suc-

tion line strainer and a maximum operating speed of

3500 RPM.

2.6.1 Digital Scroll Compressors

(28-53kW models only)

The compressor shall be scroll-type with a variable

capacity operation capability. Compressor solenoid

valve shall unload the compressor and allow for vari-

able capacity operation. The compressor shall be suc-

tion gas cooled motor, vibration isolators, thermal

overloads, automatic reset high pressure switch with

lockout after three failures, rotalock service valves,

pump down low pressure transducer, suction line

strainer, and a maximum operating speed of

3500 RPM.

2.6.1.1 Crankcase Heaters (Optional)

The compressors shall include crankcase heaters,

powered from the indoor unit electric panel.

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