Carrier 50CD-CH User Manual

Number One AirConditbning Maker

Instiillation, Start-U|5

I Division of " Carrier Corporatio

Carrier Parkway • Syracuse NY 13221

and Service Instructions

Single-Package Cooling Units

SAFETY CONSIDERATIONS

Installation and servicing of air conditioning equipment can be hazardous due to system pressure and electrical components. Only trained and quali fied service personnel should install, repair or service air conditioning equipment.

Untrained personnel can perform basic mainte nance functions of cleaning coils and filters and

replacing filters. All other operations should be per

formed by trained service personnel. When working

on air conditioning equipment, observe precautions in the literature, tags and labels attached to the unit and other safety precautions that may apply.

Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for unbrazing operations. Have fire extinguisher available for all brazing operations.

INSTALLATION

Unit Rigging and Placement — Inspect for trans

portation damage. File any claim with transporta tion agency. Spreader bars are not required if top crating is left on unit. Keep unit upright. Do not drop unit (see Fig. 1). Rollers may be used to move unit across a roof. Level by using frame as a refer ence. Leveling tolerance is ± 1 / 16-in. per linear foot in any direction. This is necessary for condensate drain to function properly. Table 1 shows unit weight. See Fig. 1 for rigging details.

Fig. 1 — Rigging Details

Table 1 — Physical Data

UNIT SIZE OPERATING WEIGHT (lb)

Unit

With Economizer* 790

Roof Curb* — 14 in. 120

COMPRESSOR

No. ...Type

Oil (oz)

REFRIGERANT (Capillary Control)

Charge (lb)

CONDENSER COIL Copper Tubes, Aluminum Fins

Rows

Fins/in.

Total Face Area (sq ft)

CONDENSER AIR FAN

Nominal Cfm

No. ...Diameter (in.)

Motor Hp (1075 Rpm)

EVAPORATOR COIL

Rows Fins/in. 13 9

Total Face Area (sq ft)

EVAPORATOR AIR FAN

Quantity...Size (in )

Nominal Cfm Minimum and Maximum Cfm (Standard Motor) 2250 - 3650

(Optional Motor) 2250 - 3750

Rpm Range Maximum Allowable Rpm Motor Pulley Pitch Diameter (in.) Fan Pulley Pitch Diameter (in )

Belt No. ...Type

Speed Change per Full Turn of

Moveable Pulley Flange (Rpm)

Moveable Pulley Maximum Full Turns

from Closed Position

Factory Setting — Full Turns Open 3 Factory Speed Setting (Rpm) 760 Motor Hp (Service Factor) Standard 1 Hp (1 4)

Optional 1 5 Hp (1 3)

HIGH-PRESSURE SWITCH

Cutout (psig) Reset (psig)

LOW-PRESSURE SWITCH (Liquid Line)

Cutout (psig)

Reset (psig)

OUTDOOR AIR INLET SCREENS*

Economizer, No . Size (in ) 2 19 X 31 X 1/2 — None on 50CH008

RETURN AIR FILTERS* (Type) Disposable — None on 50CH008

No. ...Size (in.)

»50CD008 only

50CD/CH008

730

1 — BRE2 Copeland

124

R-22

105

2 13 9 15 6

4100

1 22

1/2 Hp

Copper Tubes, Aluminum Fins

1 12x9

3000

652 - 924

924

2 4-3 4

12 7

1 A51

426 ± 7

320 ± 20

27 ± 4 67 ± 7

2 16 X 20 X 1 2 20 X 20 X 1

Accessory Roof Curb (50CD008) — See Fig. 2.

Assemble and install in aeeordance with instruetions shipped with curb. Install insulation, cant strips, roofing and flashing as required. Ductwork must

be attached to curb.

Unit gasketing to roof curb is critical for water integrity. Make sure that gasketing material shipped with the roof curb has been properly installed as indicated in Fig. 2.

Roof Mount — Check building codes for weight

distribution requirements. Table 1 shows unit weight.

Slab Mount (50CH008) — Provide a level con

crete slab the same width as unit that extends to ends

of base rails only. The slab should be 8 in. thick with 4 in. above grade. Install a gravel apron in front of

outdoor air inlet to prevent grass and foliage from obstructing airflow. Allow a minimum of 6 in. under outdoor coil for condensate drainage. In areas where prolonged sub-freezing temperatures or heavy snow occur, increase clearance to 12 in. mini mum, 18 in. maximum.

Positioning — Position unit to prevent snowdrifts

from blocking condenser coil and outdoor air intake (50CD008). Provide clearance around and above unit for airflow, safety and service access.

Do not install unit in an indoor location. Do not locate unit air inlets near exhaust vents or other sources of contaminated air.

Although unit is weatherproof, guard against water from higher level runoff and overhangs.

Fig. 2 — 50CD008 Roof Curb Dimensions and Details

Fig. 3 — 50CD008 Base Unit Dimensions

Fig. 4 — 50CH008 Base Unit Dimensions

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