Carrier 50DF034 User Manual

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50DF034

HEATING & COOLING

Installation, Start-Up and

Service Instructions

SAFETY CONSIDERATIONS

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

Untrained personnel can perform basic maintenance functions of cleaning coils and filters and replacing filters.

All other operations should be performed 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.

Single-Package Cooling Units

Alternate Unit Support Methods — Where the

preferred curb or slab mount cannot be used, support unit with sleepers on perimeter, using curb support area. However, if sleepers cannot be used, support long sides of unit (dimension A, Fig. 4) with three 4-in. x 4-in. pads

equally spaced. U nit may sag if supported by corners only.

Positioning — Unit condenser air inlets and outlets

may be located in any compass direction since they are not affected by wind. Provide clearances around and above unit for airflow, safety and service access (Fig 4).

Do not install unit in an indoor location Do not locate air inlets near exhaust vents or other sources of con taminated air

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

A WARNING

Before performing service or maintenance operations on unit, turn off main power switch to unit. Elec trical shock could cause personal injury.

INSTALLATION

Rigging and Unit Placement — Inspect unit for

transportation damage. File claim with transportation agency. Do not remove shipping skid until unit is ready to be set in final location. Do not drop unit; keep upright. Use spreader bars over unit to prevent sling or cable damage. Rollers may be used to move unit across a roof. Level by using unit frame as reference. See Fig. 1 for additional information. Unit weight is shown in Table 1.

Units are designed to be hoisted only. However, units with optional shipping skids may be moved with a fork truck. Refer to Accessory Roof Curb Installation Instruc tions for additional information as required.

Roof Curb — Assemble and install as described in

instructions shipped with this accessory. Accessory roof curb and information required to field fabricate a roof curb of 2-in. insulation, cant strips, roofing and flashing as required.

For unit drains to function properly, curb must be level

or within tolerances shown in Fig. 3.

Roof Mount — Check building codes for weight dis

tribution requirements Unit weight is shown in Table 1.

Slab Mount — Provide a level concrete slab that

extends beyond unit cabinet at least 6 inches. Make a slab 8 in. thick with 4 in. above grade. Use gravel apron in front of condenser air inlet to prevent grass and foliage from obstructing airflow.

X 14-in. planks is shown in Fig. 2. Install

NOTES1 All unit panels must be In place when rigging. 2 Do not handle unit with fork trucks 3 Use 4 cables and four 2-by-4’s or 4-by-4's of dimensions

shown.

Fig. 1 — Rigging Details

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obiigations.

Book|l PC111 Catalog No 565-032 PrintedinUSA Form 50DF-9SI Pgl 4-86 Replaces: 50DF-7SI Tab lib

For replacement items use Carrier Specified Parts

NOTE' Certified dimension drawings available upon request

Fig. 2 — Roof Curb Dimensions

GASKET

RIGID INSULATION

(FIELD SUPPLIED)

CANT STRIP (FIELD SUPPLIED)

3-|"{ENDS OF UNIT)

ROOFING MATERIAL (FIELD SUPPLIED)

Field-Fabricated Ductwork — Secure all ducts to building structure. Use flexible duct connectors between

unit and ducts as required. Insulate and weatherproof all external ductwork, joints and all roof openings with flashing and mastic in accordance with applicable codes.

Insulate ducts passing through unconditioned spaces

and cover with a vapor barrier.

Maintain one-in. minimum clearance between supply air duct and any combustible material for at least 3 ft of duct run from unit.

Unit is shipped set up for through-the-bottom duct connections. Ductwork openings are shown in Fig. 4.

Field-fabricated concentric ductwork may be connected

to units as shown in Fig. 5.

Modifications are required to convert unit for throughthe-side duct connections.

Do not use side duct connections on units with optional

power exhaust packages or accessory barometric relief

dampers.

To convert unit for through-the-side duct connection,

refer to Fig. 6 and perform the following procedure.

(Units without optional economizer);

1. Remove return air filter access panel.

2. Remove side air opening panels. Save sheet metal screws.

3. Remove return air filters.

4. Remove slant baffle that separates bottom flow supply and return air paths. Save screws.

5. Reinstall baffle on top of horizontal plenum deck so that deck opening is covered. Face insulation side of baffle down. Drill holes in horizontal plenum deck using baffle holes as location guide Use sheet metal screws removed in step 4 to secure baffle to deck.

6. Install side air opening panels in bottom air openings.

Face insulation side up Drill holes in unit basepan, using panel holes as location guide. Use sheet metal screws removed in step 2 to secure panels to basepan.

7. Reinstall return air filters. Be sure all relocated com ponents are secure.

8. Open manual outdoor air inlet hood as described

below.

Manual Damper Hood Adjustment — Loosen

hood adjustment bolts, pull hood open to desired setting.

Tighten bolts. See Fig. 4.

CONDENSER AND

COMPRESSOR END

Fig. 3 — Unit Leveling Tolerances

HORIZONTAL

10. Route the red and yellow wires through knockout in side plate. Wrap end of blue wire with electrical tape. Using wire connectors from envelope injunc tion box, wire enthalpy control assembly as shown in Fig. 8. Use strain reliefs from envelope on side plate

and junction box. Refer to Fig. 9 for Psychrometric Chart for enthalpy control.

11. Install outdoor air screens.

12. Push retainer snugly against screens and tighten

screws.

Exhaust Air Hood Installation — The optional

power exhaust hood and damper assemblies and required sheet metal screws are shipped in the compartment at right of indoor air fan motor compartment. Using screws provided, install a hood damper assembly over each exhaust air opening as shown in Fig. 4. Power exhaust is applied only to economizer units using bottom duct con nections. Exhaust fan and motor assembly is factory wired and adjusted. Refer to Service, Power Exhaust Air Fan Adjustment if required.

Indoor Air Fans — The fan belt and pulleys are factory

installed and adjusted. If required, adjust as described in Service, Indoor Air Fan Adjustment.

Economizer Section

ECONOMIZER HOOD INSTALLATION (Fig. 7) — The economizer mechanism and all electrical connections

are factory installed and adjusted except as noted below.

Hood assembly, outdoor air inlet screens and required hardware are shipped separately and must be field

installed.

Install economizer hood and enthalpy control as

follows:

1. Loosen unit top panel sheet metal screws above out door air inlet opening.

2. Assemble hood top panel, side panels and support channel.

3. Insert hood flange between unit top panel flange and unit. Slots are provided in hood flange to clear sheet metal screws. Tighten sheet metal screws. To insure water tightness, apply RTV to edges as indicated by shaded portions of Fig. 7.

4. Secure hood side panels to outdoor air opening flanges, using screws provided.

5. Install hood support bracket(s) between U-channel and support channel.

6. Install screen retainer on support channel, using screws in the slots. Do not tighten.

A CAUTION

Shut off main power to unit before installing enthalpy control assembly.

8. Remove enthalpy control assembly from shipping location on horizontal deck in return air filter compartment.

9. Using 4 no. 10-1/2 screws from envelope in control assembly junction box, mount enthalpy control assembly to inside of economizer hood side panel nearest condenser section (Fig. 4).

Condensate Drains — See Fig. 4 for drain locations.

Condensate drain is open to atmosphere and must be trapped. Install a trapped drain line at connection to be used. Trap must be at least 3 in. deep and made of flexible

material or be installed to prevent freeze-up.

Condensate drain pan under unit is fitted with a one-in. FPT coupling. A gasket is shipped taped to this drain. Install gasket in unit basepan opening or alternate open

ing on end of unit.

Field Power Supply — Unit is factory wired for voltage shown on nameplate. The main power terminal block is suitable for use with aluminum or copper wire. See Fig. 10 and 11. Units have circuit breakers for compressors, fan motors and control circuit. If required by local codes, provide an additional disconnect switch.

If an external electrical source is used, unit must be electrically grounded in accordanee with local codes, or in the absence of local codes, with the National Electrical Code, NFPA 70.

All field wiring must comply with National Electrical Code and local requirements.

Install conduit connector in unit basepan or side panel openings provided as shown in Fig. 4. Route power lines through connector to terminal connections in control box as shown in Fig. 10 and 11.

Affix crankcase heater sticker to unit disconnect switch.

Voltage to compressor terminals during compressor operation must be within voltage range indicated on unit nameplate. Also, see Table 2. Phases must be balanced within 2% Contact local power company for correction of improper voltage or phase unbalance. Failure due to operation of unit on improper line voltage or with exces sive phase unbalance constitutes abuse and may cause

damage to unit electrical components.

OUTDOOR AIR FANS

" (3)

ALTERNATE CONTROL WIRE

OPENING

3 AND 4g- K 0 ALTERNATE FIELD-POWER WIRING

(COOLING ONLY UNIT )

INDOOR AIR FAN AND FILTER

ACCESS PANELS

ALTERNATE DRAIN 2|" KO d" MPT

L-2^" UNIT)

' CONDUIT

CONN INSIDE)

ALTERNATE POWER WIRE

OPENING 3^“ (HEATING/COOLING

NPT

► OUTDOOR AIRFLOW

► INDOOR AIRFLOW

OPTIONAL ECONOMIZER AIR INTAKE HOOD

DSAM U"

^MPT CONN. INSIDE)

DIMENSIONS (ft-in :

UNIT

50DF

A B

D E 0-10yi6 F 0- 97a

Certified dimension drawings available on request NOTES-

1. Allow 12 ft above unit, 8 ft on filter access panel end and 4 ft on remaining sides of unit for airflow and service clearance 2 For smaller clearances, contact manufacturer. 3 Refer to Roof Curb Dimensions for details of roof openings

034

17- 1

7- 3'/a

4-11

9- 0

4" NPT

2-10

11- 5

Fig. 4 Base Unit Dimensions

MAIN POWER WIRE OPENING (G) (HEATING/ COOLING UNIT)

OPTIONAL EXHAUST HOODS

(3)

Fig. 5 — Concentric Duct Details

Fig. 7 — Economizer Outdoor Air Inlet

Hood Assembly

Fig. 8 — Enthalpy Control Assembly

Fig. 6 — Manual Damper Unit Indoor Air Section

DRY BULB TEMPERATURE (APPROXIMATE)-FAHRENHEIT

Fig. 9 — Psychrometric Chart for Enthalpy Control

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