Carrier 50EQ User Manual

Number One AirConditbning l\Mer

Division of Carrier Corporation

Carrier Parkway • Syracuse, N Y 13221

Single-Package Heat Pumps

INSTALLATION

Rigging and Unit Placement — Inspect unit for

transportation damage. File claim with transporta tion agency. Do not drop unit. Keep unit upright.

Units are designed to be hoisted only. However, units with optional shipping skids may be moved with a fork truck. Use spreader bars over unit to

prevent sling or cable damage to unit. Level unit by

using unit frame as reference. Leveling tolerance is

± 1 /16 in. per linear ft in any direction. See Fig. 1 for

additional information. Unit weight is shown in

Table 1.

Roof Curb — Assemble and install accessory roof

curb in accordance with instructions shipped with

accessory. (In areas of prolonged sub-freezing tem peratures or heavy snowfall, the use of an 18-in. high roof curb is recommended. This permits proper drainage during defrost.) Refer to Fig. 2.

Install insulation, cant strips, roofing and flashing

as required. Ductwork can be installed to roof curb

«OTES; t, A!i BTift (lanets jnust be in piece when rtg8^ns

2. Oo not bandte unit wsdi 'torit iruciis.

3. Use4«ei)}esan«i4"24>y-4Vor "4-by-4V'of ctenenaons shown.

Fig. 1 — Rigging Details

before unit is set in place. Curb should be level. Unit leveling tolerance is ±1/16 in. per linear ft in any direction. This is necessary to permit unit drain to function properly.

Cut hole(s) in roof to accommodate return and supply ducts only. Refer to accessory installation instructions.

Roof Mount — Check building codes for weight

distribution requirements.

Alternate Unit Support Methods — Where the

preferred curb or slab mount cannot be used, sup port unit with sleepers along unit perimeter using unit curb-support areas. However, if sleepers cannot be used, support long sides of unit (dimension “A,” Fig. 3) by three 4-in. by 4-in. pads, equally spaced.

Units may sag if supported by corners only.

Positioning — Position unit so that drifting snow

does not build up on outdoor coil. Provide clear ances around and above the unit for airflow, safety,

and service access (Fig. 3).

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 runoff and overhangs.

Field-Fabricated Ductwork — Secure all ducts to

building structure. Use flexible duct connectors be

tween unit and ducts as required. Insulate and

weatherproof all external ductwork, joints and all roof openings with flashing and mastic in accord ance with applicable codes.

Ducts passing thru unconditioned spaces must be

insulated and covered with a vapor barrier.

Unit Duct Connections — Ductwork openings

are shown in Fig. 3.

Economizer Hood Installation, Fig. 4 — The

economizer mechanism and allelectrical connections are factory installed and adjusted. The hood assem bly, outdoor air inlet screens and required hardware are shipped separately and must be field installed.

NOTE: There is a linkage rod and 3 fasteners (speed nuts) shipped with the economizer hood assembly. This rod is not required on 50EQ units.

Install economizer hood(s) as follows:

1. Loosen unit top panel sheet metal screws above outdoor air inlet opening.

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

Form 50EQ-4SI

Table 1 — Physical Data

UNIT MODEL OPERATING WEIGHT (lb)

Base Unit Base Unit with Economizer

COMPRESSOR

No. .Model Oil (3GS or B1) pts (per Compr) 10

REFRIGERANT CHARGE R-22

Sys 1*...Sys 2 (lb)

OUTDOOR AIR FANS

No. ...Hp

Frame (NEMA) Rpm (1-Phase)

IIMDOOR AIR FANS

Motor

Shaft Diam (in.) — RPM 1750

Motor Frame Size Motor Pulley Pitch Diam (in.)t Fan Pulley Pitch Diam (in.) Fan Speed (rpm)

Fan Shaft Diam (in )

Belt No. ...Size

ELECTRIC HEATERS

Heat Anticipator Setting

Stage 1 ...2

HIGH-PRESSURE SWITCH

Cutout (psig) Cut-in (psig)

LOW-PRESSURE SWITCH

Cutout (psig) 5+3 Cut-in (psig) 20 ± 5

INDOOR AIR FILTERS (2-in.)

Standard; No. ...Size (in.)

Throwaway; No. ...Size (in.)

AIR INLET SCREENS

Manual Damper; No. ...Size (in.)

Economizer; No. .. Size (in.)

Std Opt Std Opt Std Opt

Std, A,B Opt, A,B

Std

Opt Std, A,B Opt, A,B

Std Opt

50EQ024

3300 3450

2 06D824

20.0...21.3

2 . 1

56T

1050

7-1/2

1-1/8

1-3/8

1S4T

213T 6 5 6 0 5 3 5 6

106

1073 991

1159 1225

1-3/16 2 3V750 2 3V670

1300

9 25

428 320

6 20x25

6. .16x25

3 20x25

50EQ028

3900

Serviceable, Reciprocating Hermetic

Direct Drive, Propeller

Fixed Speed Centrifugal

4075

2. 06D328 10

R-22

23.5..24.0

2 . 1

56T

1050

7-1/2

1-3/8 1-3/8

213T

215T 6 5 60 5 6 60

10 6

1073 991

1225 1312

1-3/16 2 3V750 2 3V670

1300

9 25

428

320 ± 20

5 ± 3

20 ± 5

18 16x25

4 20x25

50EQ034

4550 4750

2 06D537

—

29.1..29.1

3 1 56T

1050

1-3/8 1-5/8

215T 254T

6 5 5 6

5 3 5 6

10 6

1073 925

1159 1225

1-11/16 2 3V750 4 3V710

1300

9 25

428 .jQ

320

5 + 3

20 + 5

9 20x25

12 16x25

5 20x25

*System No 1 is bottom portion of indoor coil fStandard fan motor supplied with standard fan drive pulleys and belts, optional fan motor supplied with optional

fan drive pulleys and belts Pulley A is installed in unit; pulley B is shipped with unit

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.

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.

7. Install outdoor air screens.

8. Push retainers snugly against screens and tighten screws.

Enthalpy Control — Remove enthalpy control

assembly (Fig. 5) from shipping location on hori zontal deck in return air filter compartment.

Using 4 no. 10-1 /2 screws from envelope in con

trol assembly junction box, mount the enthalpy con

trol assembly to the inside of economizer hood side panel nearest condenser section (Fig. 6).

Route the 3 wires, coiled near top cover on the condenser partition, thru knockout in side plate (Fig. 6). Using wire connectors from envelope in

junction box, wire enthalpy control assembly as

shown in Fig. 7. Use strain reliefs from envelope in

junction box on side plate and junction box (Fig. 6).

Exhaust Air Hood Installation — The optional

power exhaust package hood assemblies and re

quired sheet metal screws are shipped in compart

ment at right of indoor air fan motor.

Using screws provided, install a hood assembly

over each exhaust air opening as shown in Fig. 3.

Power exhaust applies only to units with econo mizer. The exhaust fan and motor assembly is factory wired and adjusted. Refer to Service, Ex haust Air Fan Adjustment if required.

Return Air Filters — Check to be sure return air

filters of the correct type and size are installed in

unit filter racks. Filter data is shown in Table 1. Do

not operate unit without return air filters.

Outdoor Air Inlet Screens — Be sure all outdoor

air inlet screens are in place before operating unit.

Condensate Drains — See Fig. 3 for drain loca

tions. Condensate drain is open to atmosphere and

must be trapped. Install a trapped drain line at con nection to be used. Trap must be at least 4 in. deep and made of flexible material or be installed so as to prevent freeze-up.

Condensate drain pan is fitted with a 1-in. FPT coupling. Condensate drain line may be routed thru unit base pan or unit side as shown. A grommet is shipped taped to this drain. Install this gasket in unit base pan opening or alternate opening on end of unit as required.

Field Power Wiring — All units have circuit

breakers for compressors, heaters, fan motors and control circuits. Each unit is factory wired for

voltage shown on nameplate. The main power ter minal block is suitable for use with aluminum or

copper wire. See Table 2 for use of aluminum wire

on electric heater terminal blocks.

Install conduit connections in unit base pan or

side panel opening provided as shown in Fig. 3.

On all units route power lines to terminal block in control box as shown in Fig. 8. On units with electric heat, route second power supply line thru connector to terminal block in heater compartment.

Locate field-supplied disconnect(s) within sight of and directly accessible from the unit. All field wiring must comply with NEC and local requirements.

Affix crankcase heater sticker to unit disconnect switch.

Voltage to compressor terminals during com

pressor operation must be within voltage range indi

cated on unit nameplate. Phases must be balanced

within 2%. Contact local power company for

correction of improper voltage or phase imbalance.

See Table 2 as required.

Failure due to operation of unit on improper line

voltage or with excessive phase imbalance con

stitutes abuse and may cause damage to unit electrical components.

Field Control Wiring — Install a Carrier approved

accessory thermostat assembly according to in stallation instructions included with the accessory.

Locate thermostat assembly in the conditioned

space where it will sense average temperature.

UNIT

50EQ024 50EQ028 50EQ900011 50EQ034

ROOF CURB

MODEL NO. 50EQ900001

50EQ900021

DIMENSIONS (ft-in.)

10- Cfl/4 4-11 12-10-3/4 16- 3-1/8 9- 0

6-11

4-4

Fig. 2 — Roof Curb Dimensions

D E F

—

0-6-1/4

—

0-6-1/4Ì0-5-1/8 0-6-1/4 0-5-7/8

0-6

0-5-1/8

NOTES 1 Certified dimension drawings are available on

req uest

2. For details of 12-in high roof curb, refer to 48DD

roof curb installation instructions

3. Two field power supplies are required for 50EQ

units with electric heat

st.ecT!îtc

f£ATE=i

ACCESS

PANELS

COMPRESSOR

END

ALTERMATE

CO'iTRCl. A'-SE

^OPEMiNG A-'CDNOmT

3 mo 4^ • K 0

AlTERKATE R1EL&-P0»£R WiRlNG ALL. l»f:TS

!NDOORA>!ifAN AMD «LTEft

ACCESS PA MELS

ACTES-yJATE

DRAÎÎi 2|''iCO-ÎÎ'VPr

COiWi miDE)

OL'TCXÎOR A'RPLO'#

- iMOOOSr AiftELOW

Certt^,«cf dimecswR <lf3w»i>gs avaiîab!« on recjwesi.

DiMENSiONS {ft-'jn.)

UNÎT

50EQ

A \ Î0- 9-13''f6 13- S^1/2 8

C D

F : 0- 9-7/8 0- S-7/S : C- 9-7/8 6 H

K j 2- A

024

5 7- 2-1Î/16 7- 3-1/8

1 4-10-1/2 4-10-1/2 ? 4-11 S-11 I 0-10-1/4

■ > ■ ■■ • ■ — ■■ : 3-1/2" N-PT

; 6- 1-V2 9- 0 ■ 11- 5

028

0-10-1/4

4“ NPT

...;2-.:4:.:v:

: 17- 1 : 7- 3-1/8

4-10-1/2

■ 11- 0 : 0-10-1/4

■ 1

; 4" MPT i 2-10

034

Mcrrss.

■J Aiiow 12 ft at>ove ar»t^ S ft on

2, for smaller ciearances. contact

3. Refer to Roof Curb Dmrensions 4, The 50EO034ut«t contains ittree

5. Tfte50EQ034 unit contains tnree

Fig. 3 — Base Unit Dimensions

CPTlOKAi.

ECOfJOMSZER HOOO

f iher access panel encf and 4 ft on

fenjatnfns sfdesof unttforairfiow

attd service clearance.

Carrier. for details of roof openings.

fans.

exhaiist hoods.

POWER WISE CPQiii«® m

DRAIN :

sl^OiAMit"

'■mPT conn. fNSiOEÏ

EtSCTRK tCAT 0«t,V

€

Route thermostat cable or equivalent single leads of no. 18 AWG colored wire from subbase terminals thru connectors in unit base pan or side panel (Fig.

3) to low-voltage connections in control box as shown in Fig. 9. Use no. 16 AWG wire for lengths exceeding 50 feet. Set heat anticipator settings as

indicated in Table 1.

Refer to accessory remote control panel instruc

tions as required.

Outdoor Air Thermostat — Unit is equipped with

a field adjustable outdoor air thermostat. Thermo stat is shipped taped to right-hand side of unit control box. Upon start-up, set the thermostat “close setpoint” to the building load balance point and unit capacity. Above the setpoint, the space thermostat controls 2 stages of compression heat and electric heat is locked out. Below the setpoint,

one stage of compression heat is available and elec tric heat is controlled by the second stage of the space thermostat.

Compressor(s) — Loosen compressor hold-down

bolts until sidewise movement of the washer under each hold-down bolt head can be easily obtained. Do not loosen completely as bolts are self-locking and will maintain their adjustment.

Open the compressor discharge and suction service valves. Replace and tighten valve caps to prevent leaks.

Liquid Line Service Valves — Open the liquid line

service valves. Replace caps and tighten to prevent leaks.

Fig. 4 — Economizer Outdoor Air Inlet

Hood Assembly

START-UP

Cooling

1. Open compressor service valves. Replace valve caps to prevent leaks. Make sure crankcase heater has been on for at least 24 hours to drive out any liquid refrigerant in compressor crankcase. Check compressor oil level. Oil sight glass should be about half full.

2. Be sure that liquid line service valve is open.

3. Check that setscrews are tight in fan bearing locking collar, pulley and fan blades.

4. Check pulley alignment and belt adjustment. Remove tape on indoor fan pulley.

5. Check that internal power wire terminal screw connections are tight.

6. On 3-phase units, check for correct fan rotation.

7. Set system selector switch at COOL and fan switch at AUTO. Adjust thermostat at a setting below room temperature. Compressor no. 1 will start on closure of no. 1 contactor. An addi tional rise in room temperature closes cooling

contactor no. 2 in thermostat, energizing no. 2 contactor, no. 2 compressor will start.

8. Check cooling effect at duct supply outlets.

9. Check unit charge. Refer to Refrigeration Charge in Service section.

Fig. 5 — Enthalpy Control Assembly

Fig. 6 — Enthalpy Control Assembly

Installation Details

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