Carrier 50HC14 User Manual

WeatherMaster

50HC14

Single Package Rooftop Cooling Only Unit

with Puron

(R-410A) Refrigerant

Installation Instructions

50HC units for installation in the United States contain use of Carrier's Staged Air Volume (SAV™) 2-speed indoor fan control system. This complies with the U.S. Department of Energy (DOE) efficiency standard of

2018. 50HC units for installation outside the United States may or may not contain use of the SAV 2-speed indoor fan control system as they are not required to comply with the U.S. Department of Energy (DOE) efficiency standard of 2018. For specific details on operation of the Carrier SAV 2-speed indoor fan system refer to the Variable Frequency Drive (VFD) Factory-Installed Option 2-Speed Motor Control Installation, Setup, and Troubleshooting manual.

Page

SAFETY CONSIDERATIONS. . . . . . . . . . . . . . . . . . . . 1-6

Rated Indoor Airflow (cfm) . . . . . . . . . . . . . . . . . . . . . . ..2

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-63

Jobsite Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Step 1 — Plan for Unit Location . . . . . . . . . . . . . . . . . . 6

Step 2 — Plan for Sequence of Unit Installation . 6

Step 3 — Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Step 4 — Provide Unit Support. . . . . . . . . . . . . . . . . . . 7

Step 5 — Field Fabricate Ductwork. . . . . . . . . . . . . . . 9

Step 6 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . 9

Step 7 — Convert to Horizontal and Connect

Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Step 8 — Install Outside Air Hood . . . . . . . . . . . . . . . 11

Step 9 — Install External Condensate Trap and

Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Step 10 — Make Electrical Connections . . . . . . . . . 13

Electric Heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Single Point Boxes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Humidi-MiZer EconoMi$er

Low Ambient Control (Factory Option) . . . . . . . . . 37

Staged Air Volume (SAV) with Variable Frequency

Drive (Factory Option) . . . . . . . . . . . . . . . . . . . . . . . 37

ComfortLink Controls (Factory Option) . . . . . . . . . 37

PremierLink Controller (Factory Option) . . . . . . . . 42

Supply Air Temperature Sensor . . . . . . . . . . . . . . . . . 45

Field Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Economizer Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

RTU Open Control System . . . . . . . . . . . . . . . . . . . . . . 52

Field Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Communication Wiring — Protocols . . . . . . . . . . . . 58

Local Access. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Outdoor Air Enthalpy Control . . . . . . . . . . . . . . . . . . . 60

Smoke Detectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Step 11 — Adjust Factory-Installed Options. . . . . 62

Step 12 — Install Accessories. . . . . . . . . . . . . . . . . . . 62

Pre-Start and Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

START-UP CHECKLIST . . . . . . . . . . . . . . . . . CL-1, CL-2

System Control Connections . . . . 22

X (Factory-Installed Option) . . . . . . . 24

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock or other conditions which may cause personal injury or property damage. Consult a qualified installer, service agency, or your distributor or branch for information or assistance. The qualified installer or agency must use factory-authorized kits or accessories when modifying this product. Refer to the individual instructions packaged with the kits or accessories when installing.

Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloths for brazing operations and have a fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions attached to the unit. Consult local building codes and appropriate national electrical codes (in USA, ANSI/NFPA 70, National Electrical Code (NEC); in Canada, CSA C22.1) for special requirements.

It is important to recognize safety information. This is the safety-alert symbol . When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury.

Understand the signal words DANGER, WARNING, CAUTION, and NOTE. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies hazards which could result in personal injury or death. CAUTION is used to identify unsafe practices, which may result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation.

WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could cause personal injury or death.

Before performing service or maintenance operations on unit, always turn off main power switch to unit and install lock(s) and lockout tag(s). Unit may have more than one power switch.

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

Catalog No. 04-53500157-01 Printed in U.S.A. Form 50HC-14-02SI Pg 1 12-17 Replaces: 50HC-14-01SI

WARNING

CAUTION

UNIT OPERATION AND SAFETY HAZARD

Failure to follow this warning could cause personal injury, death and/or equipment damage.

Puron

(R-410A) refrigerant systems operate at higher pressures than standard R-22 systems. Do not use R-22 service equipment or components on Puron refrigerant equipment.

WARNING

PERSONAL INJURY AND ENVIRONMENTAL HAZARD

Failure to follow this warning could cause personal injury or death.

Relieve pressure and recover all refrigerant before system repair or final unit disposal.

Wear safety glasses and gloves when handling refrigerants. Keep torches and other ignition sources away from refrigerants and oils.

CUT HAZARD

Failure to follow this caution may result in personal injury. Sheet metal parts may have sharp edges or burrs. Use care

and wear appropriate protective clothing, safety glasses and gloves when handling parts and servicing air-conditioning equipment.

Rated Indoor Airflow (cfm) — The table below lists

the rated indoor airflow used for the AHRI efficiency rating for the units covered in this document.

MODEL NUMBER

50HC*D/E/G14 4375

FULL LOAD AIRFLOW

(CFM)

50HCBD14A2A6A0A3B0

Cooling Tons

14 - 12.5 ton

Example:

Position: 2 3 4 5 6 7 8 9

11 12 13 14 15 16 17 18

Heat Options

- - None (Field Installed Accessory) A = Low Electric Heat B = Medium Electric Heat C = High Electric Heat

Sens or Options

A = None B = RA Smoke Detector C = SA Smoke Detector D = RA + SA Smoke Detector E = CO

F = RA Smoke Detector and CO

G = SA Smoke Detector and CO

H = RA + SA Smoke Detector and CO

Indoor Fan Options

1 = Standard Static Option - Belt Dirve 2 = Medium Static Option - Belt Drive C = High Static Option with High Efficency Motor - Belt Drive

Coil Options (RTPF) (Outdoor - Indoor - Hail Guard)

A = Al/Cu - Al/Cu B = Precoat Al/Cu - Al/Cu C = E-coat Al/Cu - Al/Cu D = E-coat Al/Cu - E-coat Al/Cu E = Cu/Cu - Al/Cu F = Cu/Cu - Cu/Cu M = Al/Cu -Al/Cu — Louvered Hail Guard N = Precoat Al/Cu - Al/Cu — Louvered Hail Guard P = E-coat Al/Cu - Al/Cu — Louvered Hail Guard Q = E-coat Al/Cu - E-coat Al/Cu — Louvered Hail Guard R = Cu/Cu - Al/Cu — Louvered Hail Guard S = Cu/Cu - Cu/Cu — Louvered Hail Guard

Voltage

1 = 575/3/60 5 = 208-230/3/60 6 = 460/3/60

Design Revision

A = Factory Design Revision

Base Unit Controls

0 = Electro-mechanical Controls Can be used with W7212 EconoMi$er IV (Non-Fault Detection and Diagnostic) 1 = PremierLink Controller 2 = RTU Open Multi-Protocol Controller 6 = Electro-mechanical with 2-speed fan and W7220 Econo controller Controls. Can be used with W7220 EconoMi$er X (with Fault Detection and Diagnostic) D = ComfortLink Controls

Intake / Exhaust Options

A = None B = Temperature Economizer w/ Barometric Relief F = Enthalpy Economizer w/ Barometric Relief K = 2-Position Damper U = Low Leak Temperature Economizer w/ Barometric Relief W = Low Leak Enthalpy Economizer w/ Barometric Relief

Service Options

0 = None 1 = Unpowered Convenience Outlet 2 = Powered Convenience Outlet 3 = Hinged Panels 4 = Hinged Panels and Unpowered Convenience Outlet 5 = Hinged Panels and Powered Convenience Outlet C = Foil Faced Insulation D = Foil Faced Insulation with Unpowered Convenience Outlet E = Foil Faced Insulation with Powered Convenience Outlet F = Foil Faced Insulation & Hinged Panels G = Foil Faced Insulation & Hinged Panels with Unpowered Convenience Outlet H = Foil Faced Insulation & Hinged Panels with Powered Convenience Outlet

Factory Assigned

0 = Standard 1 = LTL

Electrical Options

A = None B = HACR Breaker C = Non-Fused Disconnect D = Thru-The-Base Connections E = HACR and Thru-The-Base Connections F = Non-Fused Disconnect and Thru-The-Base Connections G = 2-Speed Indoor Fan (VFD) Controller H = 2-Speed Fan Controller (VFD) and HACR J = 2-Speed Fan Controller (VFD) and Non-Fused Disconnect K = 2-Speed Fan Controller (VFD) and Thru-The-Base Connections L = HACR w/ Thru-The-Base & 2-Speed Fan Controller (VFD) M = 2-Speed Fan Controller (VFD) with Non-Fused Disconnect and Thru-The-Base Connections

Refrig. Syste ms Options

D = Two stage cooling models E = Two stage cooling models with Humidi-MiZer G = Two stage cooling models with MotorMaster Low Ambient Controller

Model Series - WeatherMaster

HC - High Efficiency

Unit Heat Type

50 - Electric Heat Packaged Rooftop

Fig. 1 — 50HC 14 Model Number Nomenclature (Example)

Fig. 2 — Unit Dimensional Drawing — 14 Size Unit

HORIZONTAL ECONOMIZER

VERTICAL ECONOMIZER

Fig. 2 — Unit Dimensional Drawing — 14 Size Unit (cont)

NOTE: Unit not designed to have overhead obstruction. Contact Application Engineering for guidance on any application planning overhead obstruction or for vertical clearances.

LOCATION DIMENSION CONDITION

48-in. (1219 mm) 18-in. (457 mm) 18-in. (457 mm) 12-in. (305 mm)

Unit disconnect is mounted on panel No disconnect, convenience outlet option Recommended service clearance Minimum clearance

42-in. (1067 mm) 36-in. (914 mm)

Surface behind servicer is grounded (e.g., metal, masonry wall) Surface behind servicer is electrically non-conductive (e.g., wood, fiberglass)

36-in. (914 mm) 18-in. (457 mm)

Side condensate drain is used Minimum clearance

42-in. (1067 mm) 36-in. (914 mm)

Surface behind servicer is grounded (e.g., metal, masonry wall, another unit) Surface behind servicer is electrically non-conductive (e.g., wood, fiberglass)

Fig. 3 — Service Clearance Dimensional Drawing

INSTALLATION

Jobsite Survey —

installation.

1. Consult local building codes and the NEC (National Electrical Code) ANSI/NFPA 70 for special installation requirements.

2. Determine unit location (from project plans) or select unit location.

3. Check for possible overhead obstructions which may interfere with unit lifting or rigging.

Complete the following checks before

Step 1 — Plan for Unit Location — Select a loca-

tion for the unit and its support system (curb or other) that provides for at least the minimum clearances required for safety. This includes the clearance to combustible surfaces, unit performance and service access below, around and above unit as specified in unit drawings. See Fig. 3.

NOTE: Consider also the effect of adjacent units.

Unit may be installed directly on wood flooring or on Class

A, B, or C roof-covering material when roof curb is used.

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

Although unit is weatherproof, avoid locations that permit water from higher level runoff and overhangs to fall onto the unit.

Select a unit mounting system that provides adequate height to allow installation of condensate trap per requirements. Refer to Step 9 — Install External Condensate Trap and Line for required trap dimensions.

ROOF MOUNT — Check building codes for weight distribution requirements. Unit operating weight is shown in Table 1.

Table 1 — Operating Weights

50HC**14

COMPONENT UNITS LB (KG)

Base Unit

Economizer

Vertical

Horizontal

Humidi-MiZer System

Powered Outlet

Curb

14-in. (356 mm)

24-in. (610 mm)

1360 (617)

103 (47)

242 (110)

90 (41)

35 (16)

180 (82)

255 (116)

Step 2 — Plan for Sequence of Unit Installation —

ferent sequences for the steps of unit installation. For example, on curb-mounted units, some accessories must be installed on the unit before the unit is placed on the curb. Review the following for recommended sequences for installation steps.

The support method used for this unit will dictate dif-

CURB-MOUNTED INSTALLATION

Install curb Install field-fabricated ductwork inside curb

Install accessory thru-base service connection package (affects curb and unit) (refer to accessory installation instructions for details)

Prepare bottom condensate drain connection to suit planned condensate line routing (refer to Step 9 for details)

Rig and place unit

Install outdoor air hood

Install condensate line trap and piping

Make electrical connections

Install other accessories

PAD-MOUNTED INSTALLATION

Prepare pad and unit supports

Check and tighten the bottom condensate drain connection plug

Rig and place unit

Convert unit to side duct connection arrangement

Install field-fabricated ductwork at unit duct openings

Install outdoor air hood

Install condensate line trap and piping

Make electrical connections

Install other accessories

FRAME-MOUNTED INSTALLATION — Frame-mounted applications generally follow the sequence for a curb installation. Adapt as required to suit specific installation plan.

Step 3 — Inspect Unit — Inspect unit for transporta-

tion damage. File any claim with transportation agency.

Confirm before installation of unit that voltage, amperage and circuit protection requirements listed on unit data plate agree with power supply provided.

On units with hinged panel option, check to be sure all latches are snug and in closed position.

Locate the carton containing the outside air hood parts; see Fig. 11 and 12. Do not remove carton until unit has been rigged and located in final position.

Step 4 — Provide Unit Support

ROOF CURB MOUNT — Accessory roof curb details and dimensions are shown in Fig. 4. Assemble and install accessory roof curb in accordance with instructions shipped with the curb.

NOTE: The gasketing of the unit to the roof curb is critical for a watertight seal. Install gasket supplied with the roof curb as shown in Fig. 4. Improperly applied gasket can also result in air leaks and poor unit performance.

Curb should be level. This is necessary for unit drain to function properly. Unit leveling tolerances are show in Fig. 5. Refer to Accessory Roof Curb Installation Instructions for additional information as required.

Fig. 4 — Roof Curb Details

MAXIMUM ALLOWABLE DIFFERENCE IN. (MM)

A-B B-C A-C

0.5" (13) 1.0" (25) 1.0" (25)

Fig. 5 — Unit Leveling Tolerances

Install insulation, cant strips, roofing felt, and counter flashing as shown. Ductwork must be attached to curb and not to the unit.

IMPORTANT: If the unit’s electric and control wiring is to be routed through the basepan and the unit is equipped with the factory-installed Thru-the-Base service option see the following sections:

• Factory-Option Thru-Base Connections on page 19 If using the field-installed Thru-the-Base accessory follow

the instructions provided with the accessory kit.

NOTE: If electrical connection is not going to occur at this time, tape or otherwise cover the fittings so that moisture does not get into the building or conduit in the interim.

SLAB MOUNT (HORIZONTAL UNITS ONLY) — Provide a level concrete slab that extends a minimum of 6 in. (150 mm) beyond unit cabinet. Install a gravel apron in front of condenser coil air inlet to prevent grass and foliage from obstructing airflow.

NOTE: Horizontal units may be installed on a roof curb if required.

ALTERNATE UNIT SUPPORT (IN LIEU OF CURB OR SLAB MOUNT) — A non-combustible sleeper rail can be

used in the unit curb support area. If sleeper rails cannot be used, support the long sides of the unit with a minimum of 3 equally spaced 4-in. x 4-in. (102 mm x 102 mm) pads on each side.

Step 5 — Field Fabricate Ductwork

NOTE: Cabinet return-air static pressure (a negative condition) shall not exceed 0.35 in. wg (87 Pa) with economizer or 0.45 in. wg (112 Pa) without economizer.

For vertical ducted applications, secure all ducts to roof curb and building structure. Do not connect ductwork to unit.

Fabricate supply ductwork so that the cross sectional dimensions are equal to or greater than the unit supply duct opening dimensions for the first 18 in. (458 mm) of duct length from the unit basepan.

Insulate and weatherproof all external ductwork, joints, and roof openings with counter flashing and mastic in accordance with applicable codes.

Ducts passing through unconditioned spaces must be insulated and covered with a vapor barrier.

If a plenum return is used on a vertical unit, the return should be ducted through the roof deck to comply with applicable fire codes.

FOR UNITS WITH ACCESSORY OR OPTIONAL ELECTRIC HEATERS — All installations require a minimum

clearance to combustible surfaces of 1-in. (25 mm) from duct for first 12-in. (305 mm) away from unit.

Outlet grilles must not lie directly below unit discharge. NOTE: A 90-degree elbow must be provided in the ductwork

to comply with UL (Underwriters Laboratories) code for use with electric heat.

WARNING

PERSONAL INJURY HAZARD

Failure to follow this warning could cause personal injury. For vertical supply and return units, tools or parts could

drop into ductwork and cause an injury. Install a 90-degree turn in the return ductwork between the unit and the conditioned space. If a 90-degree elbow cannot be installed, then a grille of sufficient strength and density should be installed to prevent objects from falling into the conditioned space. Due to electric heater, supply duct will require 90-degree elbow.

CAUTION

PROPERTY DAMAGE HAZARD

Failure to follow this caution may result in damage to roofing materials.

Membrane roofs can be cut by sharp sheet metal edges. Be careful when placing any sheet metal parts on such roof.

Step 6 — Rig and Place Unit — When the unit is

ready to be rigged and no longer will be lifted by a fork truck, the wood protector under the basepan must be removed. Remove 4 screws from each base rail. Wood protector will drop to the ground. See instructions on the unit base rails.

Keep unit upright and do not drop. Spreader bars are required. Rollers may be used to move unit across a roof. Level by using unit frame as a reference. See Table 1 and Fig. 6 for additional information.

Lifting holes are provided in base rails as shown in Fig. 6. Refer to rigging instructions on unit.

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage.

All panels must be in place when rigging. Unit is not designed for handling by fork truck when panels or packaging are removed.

Before setting the unit onto the curb, recheck gasketing on curb.

NOTES:

1. SPREADER BARS REQUIRED — Top damage will occur if spreader bars are not used.

2. Dimensions in ( ) are in millimeters.

3. Hook rigging shackles through holes in base rail, as shown in detail “A.” Holes in base rails are centered around the unit center of gravity. Use wooden top to prevent rigging straps from damaging unit.

UNIT

MAX

WEIGHT

DIMENSIONS

ABC

lb kg in. mm in. mm in. mm

50HC**14 2105 957 116.0 2945 62.5 1590 59.5 1510

DETAIL “A”

PLACE ALL SEAL STRIP IN PLACE BEFORE PLACING UNIT ON ROOF CURB.

DUCT END

SEE DETAIL “A”

(914 - 1371)

36" - 54"

“B”

“A”

“C”

Fig. 6 — Rigging Details

POSITIONING ON CURB — For full perimeter curbs CRRFCURB074A00 and 075A00, the clearance between the roof curb and the front and rear base rails should be (6.4 mm). The clearance between the curb and the end base rails should be

/2 in. (13 mm). For retrofit applications with

/4 in.

curbs CRRFCURB003A01 and 4A01, the unit should be positioned as shown in Fig. 7. Maintain the 15.5 in. (394 mm) and

/8 in. (220 mm) clearances and allow the 225/16 in. (567 mm)

dimension to float if necessary.

Fig. 7 — Retrofit Installation Dimensions

If the alternative condensate drain location through the bottom of the unit is used in conjunction with a retrofit curb, the hole in the curb must be moved 12.5 in. (320 mm) towards the end of the unit. (See Fig. 8.)

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

Original Position

Fig. 8 — Alternative Condensate Drain Hole

Positions

IMPORTANT: If the unit has the factory-installed Thruthe-Base option, make sure to complete installation of the option before placing the unit on the roof curb. See the following section:

• Factory-Option Thru-Base Connections on page 19

NOTE: If electrical connections are not going to occur at this time, tape or otherwise cover the fittings so that moisture does not get into the building or conduit in the interim.

Remove all shipping materials and top skid. Remove extra center post from the condenser end of the unit so that the condenser end of the unit matches Fig. 18-20. Recycle or dispose of all shipping materials.

New Position (moved 12.5 in.)

Step 7 — Convert to Horizontal and Connect

FILTER ACCESS PANEL

INDOOR COIL ACCESS PANEL

Ductwork (When Required) —

vertical duct configuration. Unit without factory-installed economizer or return air smoke detector option may be fieldconverted to horizontal ducted configuration using accessory CRDUCTCV002A00. To convert to horizontal configuration, remove screws from side duct opening covers and remove covers. See Fig. 9.

Unit is shipped in the

Fig. 10 — Typical Access Panel Locations

Fig. 9 — Horizontal Conversion Panels

Discard the supply duct cover. Install accessory CRDUCTCV002A00 to cover the vertical supply duct opening. Use the return duct cover removed from the end panel to cover the vertical return duct opening.

Field-supplied flanges should be attached to horizontal duct openings and all ductwork should be secured to the flanges. Insulate and weatherproof all external ductwork, joints, and roof or building openings with counter flashing and mastic in accordance with applicable codes.

Do not cover or obscure visibility to the unit’s informative data plate when insulating horizontal ductwork.

Step 8 — Install Outside Air Hood

ECONOMIZER HOOD REMOVAL AND SETUP — FACTORY OPTION

1. The hood is shipped in knock-down form and located in the return air compartment. It is attached to the economizer using two plastic tie-wraps.

2. To gain access to the hood, remove the filter access panel. (See Fig. 10.)

3. Locate and cut the (2) plastic tie-wraps, being careful to not damage any wiring. (See Fig. 11.)

4. Carefully lift the hood assembly through the filter access opening and assemble per the steps outlined in Economizer Hood and Two-Position Hood on page 12.

Remove Hood Parts

Cut Plastic Ties (2) Places

Economizer

Fig. 11 — Economizer Hood Package Location

TWO POSITION DAMPER HOOD REMOVAL AND SETUP — FACTORY OPTION

1. The hood is shipped in knock-down form and assembled to a metal support tray using plastic stretch wrap. Located in the return air compartment, the assembly’s metal tray is attached to the basepan and also attached to the damper using two plastic tie-wraps.

2. To gain access to the hood, remove the filter access panel. (See Fig. 10.)

3. Locate the (2) screws holding the metal tray to the basepan and remove. In order to remove the screws, it may be necessary to remove the panel underneath the two-position damper. Remove the two screws. Locate and cut the (2) plastic tie-wraps securing the assembly to the damper. (See Fig. 12.) Be careful to not damage any wiring or cut tie-wraps securing any wiring.

4. Carefully lift the hood assembly (with metal tray) through the filter access opening and assemble per the steps outlined in Economizer Hood and Two-Position Hood on page 12.

5. If removed, reattach the panel under the damper.

Hood Parts

Plastic Tie Wrap Qty (2)

Screws for Metal Tray Qty (2)

TOP PAN EL

INDOOR COIL ACCESS PANEL

SCREW

HOOD DIVIDER

LEFT HOOD SIDE

Fig. 12 — Two-Position Damper Hood Package

Location

ECONOMIZER HOOD AND TWO-POSITION HOOD NOTE: If the power exhaust accessory is to be installed on the

unit, the hood shipped with the unit will not be used and must be discarded. Save the aluminum filter for use in the power exhaust hood assembly.

1. The indoor coil access panel will be used as the top of the hood. If the panel is still attached to the unit, remove the screws along the sides and bottom of the panel. See Fig. 13.

2. Swing out indoor coil access panel and insert the hood sides under the panel (hood top). Be careful not to lift the panel too far as it might fall out. Use the screws provided to attach the hood sides to the hood top. Use screws provided to attach the hood sides to the unit. See Fig. 14.

3. Remove the shipping tape holding the economizer barometric relief damper in place.

4. Insert the hood divider between the hood sides. See Fig. 14 and 15. Secure hood divider with 3 screws on each hood side. The hood divider is also used as the bottom filter rack for the aluminum filter.

5. Attach the post that separates the filters with the screws provided.

6. Open the filter clips which are located underneath the hood top. Insert the aluminum filters into the bottom filter rack (hood divider). Push the filter into position past the open filter clips. Close the filter clips to lock the filters into place. See Fig. 15.

7. Install the two rain deflectors on the edge of the hood top as shown in Fig. 13.

8. Caulk the ends of the joint between the unit top panel and the hood top as shown in Fig. 13.

9. Replace the filter access panel.

SIDE PAN EL

RAIN DEFLECTORS

TOP PAN EL

INDOOR COIL ACCESS PAN EL

CAULK HERE

Fig. 13 — Indoor Coil Access Panel Relocation

Fig. 14 — Economizer Hood Construction

DIVIDER

OUTSIDE AIR

HOOD

CLEANABLE ALUMINUM FILTER

BAROMETRIC RELIEF

FILTER

Fig. 15 — Economizer Filter Installation

FILTER CLIP

Step 9 — Install External Condensate Trap

DRAIN (FACTORY-INSTALLED)

PLUG

CONDENSATE PAN (SIDE VIEW)

STANDARD SIDE DRAIN

ALTERNATE BOTTOM DRAIN

NOTE: Trap should be deep enough to offset maximum unit static difference. A 4 in. (102 mm) trap is recommended.

MINIMUM PITCH 1˝ (25 mm) PER 10´ (3 m) OF LINE

BASE RAIL

OPEN VENT

TO ROOF DRAIN

DRAIN PLUG

ROOF CURB

SEE NOTE

3˝(76 mm)

MIN

and Line —

nection on the end of the condensate pan and an alternate connection on the bottom. See Fig. 16. Unit airflow configuration does not determine which drain connection to use. Either drain connection can be used with vertical or horizontal applications.

Fig. 16 — Condensate Drain Pan (Side View)

When using the standard side drain connection, ensure the red plug in the alternate bottom connection is tight. Do this before setting the unit in place. The red drain pan can be tightened

with a

/2-in. square socket drive extension.

To use the alternate bottom drain connection, remove the red drain plug from the bottom connection (use a socket drive extension) and install it in the side drain connection.

The piping for the condensate drain and external trap can be completed after the unit is in place. See Fig. 17.

All units must have an external trap for condensate drainage. Install a trap at least 4-in. (102 mm) deep and protect against freeze-up. If drain line is installed downstream from the external trap, pitch the line away from the unit at 1-in. per 10 ft (25 mm in 3 m) of run. Do not use a pipe size smaller than the unit connection (

The unit has one 3/4-in. condensate drain con-

/2-in. square

/4-in.).

Step 10 — Make Electrical Connections

WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or death.

Unit cabinet must have an uninterrupted, unbroken electrical ground to minimize the possibility of personal injury if an electrical fault should occur. This ground may consist of electrical wire connected to unit ground lug in control compartment, or conduit approved for electrical ground when installed in accordance with NEC (National Electrical Code); ANSI/NFPA 70, latest edition (in Canada, Canadian Electrical Code CSA [Canadian Standards Association] C22.1), and local electrical codes.

NOTE: Field-supplied wiring shall conform with the limitations of minimum 63°F (3°C) rise.

FIELD POWER SUPPLY — For those units without through-the-curb power, conduit must be used to route the main power from the condenser end, via the power entry in the corner post of the unit (see Fig. 18-20) to either the factory option disconnect or the bottom of the control box. 1-in. conduit is provided wrapped around compressor. A second conduit is provided with factory installed powered convenience outlet. For those units that require conduit larger than 1-in., it must be field supplied. Figures 18-20 show the wire routings.

If the field disconnect is larger than 100A, it must be attached to the unit using accessory CRDISBKT001A00 — disconnect switch bracket (see Fig. 21). Follow the instructions provided with this accessory. For smaller field disconnects, be sure to use end panel (see Fig. 22). In either case, set the disconnect vertical location on the unit so that a 90 degree fitting can be used to connect the conduit to the disconnect.

/2-in. screws to mount the disconnect directly to the

Fig. 17 — Condensate Drain Piping Details

Fig. 18 — Conduit into Factory Option Non-Fused

Disconnect or HACR

Fig. 19 — Conduit into Control Box

Fig. 22 — Mounting Position for Field Disconnects

(up to 100A)

Field power wires are connected to the unit at line-side pressure lugs at the main terminal block (TB1) or at factoryinstalled option non-fused disconnect switch or HACR, or field or factory-installed Single Point box for electric heat. Refer to Table 2 for maximum wire size at connection lugs. Use copper wire only. See Fig. 23.

Table 2 — Connection Lug Min/Max Wire Sizes

Fig. 20 — Conduit into Single Point Box

Fig. 21 — Mounting Position for Field Disconnects

(over 100A)

MINIMUM MAXIMUM TB1 in unit control box #14 #1 Terminal/Fuse block in

Single Point Box for Electric Heat

80A Disconnect Option #14 #4 100A Disconnect Option #8 1/0 200A Disconnect Option #4 300 kcmil 25A HACR Option #14 1/0 30A HACR Option #14 1/0 35A HACR Option #14 1/0 40A HACR Option #14 1/0 50A HACR Option #14 1/0 60A HACR Option #14 1/0 70A HACR Option #14 1/0 80A HACR Option #14 1/0 90A HACR Option #14 1/0 100A HACR Option #14 1/0 110A HACR Option #4 300 kcmil 125A HACR Option #4 300 kcmil 150A HACR Option #4 300 kcmil 175A HACR Option #4 300 kcmil 200A HACR Option #4 300 kcmil

#8 3/0

NOTE: TEST LEADS — Unit may be equipped with short leads (pigtails) on the field line connection points off the optional non-fused disconnect switch or HACR. These leads are for factory run-test purposes only; remove and discard before connecting field power wires to unit connection points. Make field power connections directly to line connection pressure lugs only.

Units Without Single Point Box, Disconnect or HACR Option

Units With Disconnect or HACR Option

Optional

Disconnect

Switch

or HACR

Disconnect factory test leads; discard.

Factory Wiring

Equip GR Lug

Ground

(GR)

Units With Electric Heat Option with Single Point Box

and Without Disconnect or HACR Option

Single Point Box

Factory Wiring

Equip GR

Lug

Ground (GR)

Terminal Block

— OR —

Single Point Box

Factory Wiring

Equip GR

Lug

Ground (GR)

Fuse/Terminal Block

Fuse

Disconnect

per

NEC

11 1 2 13

L1 L2 L3

TB1

208/230-3-60

460-3-60 575-3-60

Ground

(GR)

Equip

GR Lug

WARNING

FIRE HAZARD

Failure to follow this warning could result in personal injury, death, or property damage intermittent operation or performance satisfaction.

Do not connect aluminum wire between disconnect switch and air conditioning unit. Use only copper wire. (See Fig. 24.)

ELECTRIC

DISCONNECT

SWITCH

COPPER

WIRE ONLY

ALUMINUM

WIRE

Fig. 24 — Disconnect Switch and Unit

ALL UNITS — All field wiring must comply with NEC and all local requirements.

Size wire based on MCA (Minimum Circuit Amps) on the unit informative plate. See Fig. 23 and the unit label diagram for power wiring connections to the unit power terminal blocks and equipment ground. Refer to Table 2 for maximum wire size at connection lugs.

Provide a ground-fault and short-circuit over-current protection device (fuse or breaker) per NEC Article 440 (or local codes). Refer to unit informative data plate for MOCP (Maximum Over-current Protection) device size.

NOTE: Units ordered with factory installed HACR do not need an additional ground-fault and short-circuit over-current protection device unless local codes require.

Voltage to compressor terminals during operation must be within voltage range indicated on unit nameplate. On 3-phase units, voltages between phases must be balanced within 2% and the current within 10%. Use the following formula to determine the percent of voltage imbalance.

% Voltage imbalance

= 100 x

Example: Supply voltage is 230-3-60.

max voltage deviation from average voltage

average voltage

AB = 224 v BC = 231 v AC = 226 v

Fig. 23 — Power Wiring Connections

Average Voltage =

Determine maximum deviation from average voltage.

(AB) 227 (BC) 231 (AC) 227

– 224 = 3 v

– 227 = 4 v – 226 = 1 v

Maximum deviation is 4 v.

224 + 231 + 226

681

227

Determine percent of voltage imbalance.

226

% Voltage Imbalance = 100 x

= 1.76%

This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%.

IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact your local electric utility company immediately.

All units except 208/230-v units are factory wired for the

voltage shown on the nameplate. If the 208/230-v unit is to be

connected to a 208-v power supply, the control transformer must be rewired by moving the black wire with the male spade connector from the 230-v connection and moving it to the 200-v

/4-in. male terminal on the primary side of the

/4-in. fe-

transformer. Refer to unit label diagram for additional

information.

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage.

Operation on improper line voltage or excessive phase imbalance constitutes abuse and may cause damage to electrical components. Such operation would invalidate any applicable Carrier warranty.

NOTE: Check all factory and field electrical connections for tightness.

UNITS WITHOUT FACTORY-INSTALLED NON-FUSED DISCONNECT OR HACR — When installing units, provide

a disconnect switch of adequate size per NEC (National Electrical Code). Disconnect sizing data is provided on the unit informative plate. Locate on unit cabinet or within sight of the unit per national or local codes. Do not cover unit informative plate if mounting the disconnect on the unit cabinet.

UNITS WITH FACTORY-INSTALLED NON-FUSED DISCONNECT OR HACR — The factory-installed option non-fused disconnect switch (NFD) is located in a weather-

proof enclosure located under the main control box. The manual switch handle is shipped in the disconnect or HACR enclosure. Assemble the shaft and handle to the switch or HACR at this point. Discard the factory test leads (see Fig. 23). The factory disconnect is a 200A disconnect on 230-3-60 units and a 100A disconnect on 460-3-60 and 575-3-60 units. On units with factory installed non-fused disconnect, without factory installed electric heat, the factory supplied load side wires may be of insufficient size for accessory electric heat applications. If so, remove the load side factory wiring. Re-size wires per unit nameplate data provided with accessory electric heat.

Fig. 25 — Location of Non-Fused Disconnect

Enclosure

To field install the NFD shaft and handle:

1. Remove the unit front panel (see Fig. 2).

2. Remove (3) hex screws on the NFD enclosure - (2) on the face of the cover and (1) on the bottom.

3. Remove the front cover of the NFD enclosure.

4. Make sure the NFD shipped from the factory is at OFF position (the arrow on the black handle knob is at OFF).

5. Insert the shaft with the cross pin on the top of the shaft in the horizontal position.

6. Measure the tip of the shaft to the top surface of the pointer to be 3.75 to 3.88 in. (95 to 99 mm) for 80A and 100A NFD and 3.43 to 3.56 in. (87 to 90 mm) for 200A NFD.

7. Tighten the locking screw to secure the shaft to the NFD.

8. Turn the handle to the OFF position with red arrow pointing at OFF.

9. Install the handle on to the painted cover horizontally with the red arrow pointing to the left.

10. Secure the handle to the painted cover with (2) screws and lock washers supplied.

11. Engaging the shaft into the handle socket, re-install (3) hex screws on the NFD enclosure.

12. Re-install the unit front panel.

Fig. 26 — Handle and Shaft Assembly for NFD

6. Tighten the locking screw to secure the shaft to the HACR.

7. Turn the handle to the OFF position with red arrow pointing at OFF.

8. Install the handle on to the painted cover horizontally with the red arrow pointing to the left.

9. Secure the handle to the painted cover with (2) screws and lock washers supplied.

10. Engaging the shaft into the handle socket, re-install (3) hex screws on the HACR enclosure.

11. Re-install the unit front panel.

Fig. 27 — Location of HACR Enclosure

To field install the HACR shaft and handle:

1. Remove the unit front panel (see Fig. 2).

2. Remove (3) hex screws on the HACR enclosure - (2) on the face of the cover and (1) on bottom.

3. Remove the front cover of the HACR enclosure.

4. Make sure the HACR shipped from the factory is at OFF position (the white arrow pointing at OFF).

5. Insert the shaft all the way with the cross pin on the top of the shaft in the horizontal position.

Fig. 28 — Handle and Shaft Assembly for HACR

CONVENIENCE OUTLETS

WARNING

ELECTRICAL OPERATION HAZARD

Failure to follow this warning could result in personal injury or death.

Units with convenience outlet circuits may use multiple disconnects. Check convenience outlet for power status before opening unit for service. Locate its disconnect switch, if appropriate, and open it. Lock-out and tag-out this switch, if necessary.

Two types of convenience outlets are offered on the 50HC**14 models: non-powered and unit-powered. Both types provide a 125-volt GFCI (ground-fault circuit-interrupter) duplex receptacle rated at 15-A behind a hinged waterproof access cover, located on the panel beneath the control box. See Fig. 29.

Non-powered type: This type requires the field installation of a general-purpose 125-volt 15-A circuit powered from a source elsewhere in the building. Observe national and local codes when selecting wire size and conduit requirements, fuse or breaker requirements and disconnect switch size and location. Route 125-v power supply conductors into the bottom of the utility box containing the duplex receptacle.

UNIT

VOLTAGE

CONNECT ASPRIMARY

CONNECTIONS

TRANSFORMER

TERMINALS

208,230 240

L1: RED +YEL

L2: BLU + GRA

H1 + H3 H2 + H4

460 480

L1: RED

Splice BLU + YEL

L2: GRA

H2 + H3

575 600

L1: RED

L2: GRA

H1 H2

Pwd-CO

Fuse

Switch

Convenience

Outlet

GFCI

Disconnect

Access Panel

Fig. 29 — Convenience Outlet Location

Unit-powered type: A unit-mounted transformer is factory-installed to stepdown the main power suppl voltage to the unit to 115-v at the duplex receptacle. This option also includes a manual switch with fuse, located in a utility box and mounted on a bracket behind the convenience outlet; access is through the unit’s control box access panel. See Fig. 29.

The primary leads to the convenience outlet transformer are not factory-connected. Selection of primary power source is a customer-option. If local codes permit, the transformer primary leads can be connected at the line-side terminals on the unitmounted non-fused disconnect; this will provide service power to the unit when the unit disconnect switch is open. Other connection methods will result in the convenience outlet circuit being de-energized when the unit disconnect switch is open. See Fig. 31. On a unit without a unit-mounted disconnect, connect the source leads to the main terminal block (TB1).

If the convenience outlet transformer is connected to the line side of a field disconnect, the conduit provided with the unit must be used to protect the wire as they are routed from the transformer to the field disconnect. The end of the conduit with the straight connector attaches to the field disconnect. The other end does not need to connect to the transformer; however, the conduit must be routed so that all wiring is either in the conduit or behind the access panel.

If the convenience outlet transformer is connected to the line side of the factory disconnect option, route the wires through the web bushing located on the bottom of the disconnect box. For the load side wiring to the factory option disconnect, route the wires through the hole on the right side of the disconnect. Be sure to create a drip loop at least 6-in. long.

Test the GFCI receptacle by pressing the TEST button on the face of the receptacle to trip and open the receptacle. Check for proper grounding wires and power line phasing if the GFCI receptacle does not trip as required. Press the RESET button to clear the tripped condition.

Pwd-CO

Transformer

NOTICE/AVIS

Convenience Outlet Utilization

Maximum Intermittent Use 15 - Amps

Maximum Continuous Use 8 - Amps

Observe a 50% limit on the circuit

Loading above 8 - Amps

Utilisation de la prise utilitaire

Usage intermittent maximum 15 - Amps

Usage continu maximum 8 - Amps

Observez une limite de 50% sur le circuit

Chargement au-dessus de 8 - Amps

Fig. 30 — Convenience Utilization Notice

Fig. 31 — Unit Powered Convenience Outlet Wiring

Fuse on power type: The factory fuse is a Bussman “Fusetron” T-15, non-renewable screw-in (Edison base) type plug fuse.

WARNING

ELECTRICAL OPERATION HAZARD

Failure to follow this warning could result in personal injury or death.

Using unit-mounted convenience outlets: Units with unitmounted convenience outlet circuits will often require that two disconnects be opened to de-energize all power to the unit. Treat all units as electrically energized until the convenience outlet power is also checked and de-energization is confirmed. Observe National Electrical Code Article 210, Branch Circuits, for use of convenience outlets.

Installing Weatherproof Cover: A weatherproof while-inuse cover for the factory-installed convenience outlets is now required by UL standards. This cover cannot be factory-mount-

2.050HE501288

ed due its depth; it must be installed at unit installation. For shipment, the convenience outlet is covered with a blank cover plate.

The weatherproof cover kit is shipped in the unit’s control box. The kit includes the hinged cover, a backing plate and gasket.

DISCONNECT ALL POWER TO UNIT AND CONVENIENCE OUTLET. LOCK-OUT AND TAG-OUT ALL POWER.

Remove the blank cover plate at the convenience outlet; discard the blank cover.

Loosen the two screws at the GFCI duplex outlet, until approximately

/2-in. (13 mm) under screw heads are exposed. Press the gasket over the screw heads. Slip the backing plate over the screw heads at the keyhole slots and align with the gasket; tighten the two screws until snug (do not over-tighten).

Mount the weatherproof cover to the backing plate as shown in Fig. 32. Remove two slot fillers in the bottom of the cover to permit service tool cords to exit the cover. Check for full closing and latching.

COVER – WHILE-IN-USE WEATHERPROOF

RECEPTACLE NOT SHOWN

Fig. 33 — HACR Caution Label

FACTORY OPTION THRU-BASE CONNECTIONS — This service connection kit consists of a

head connector and a 1

/2-in. electrical bulkhead connector,

/2-in. electrical bulk-

connected to an “L” bracket covering the embossed (raised) section of the unit basepan in the condenser section. See Fig. 34. The control wires to pass through the basepan. The 1

/2-in. bulkhead connector enables the low-voltage

/2-in. electrical bulkhead connector allows the high-voltage power wires to pass through the basepan.

BASE PLATE FOR GFCI RECEPTACLE

Fig. 32 — Weatherproof Cover Installation

HACR — The amp rating of the HACR factory-installed option is based on the size, voltage, indoor motor and other electrical options of the unit as shipped from the factory. If field-installed accessories are added or changed in the field (i.e., power exhaust), the HACR may no longer be of the proper amp rating and therefore will need to be removed from the unit. See unit nameplate and label on factory-installed HACR for the amp rating of the HACR that was shipped with the unit from the factory. See unit nameplates for the proper fuse, HACR or maximum over-current protection device required on the unit with field-installed accessories.

/2” ELECTRICAL BULKHEAD CONNECTOR

11/2” ELECTRICAL BULKHEAD CONNECTOR

Fig. 34 — Thru-the Base Option, Shipping

Position

1. Remove the “L” bracket assembly from the unit.

2. Remove connector plate assembly from the “L” bracket and discard the “L” bracket, but retain the washer head screws and the gasket (located between the “L” bracket and the connector plate assembly).

NOTE: Take care not to damage the gasket, as it is reused in the following step.

3. Place the gasket over the embossed area in the basepan, aligning the holes in the gasket to the holes in the basepan. See Fig. 35.

4. Install the connector plate assembly to the basepan using 8 of the washer head screws.

NOTE: If electrical connections are not going to occur at this time, tape or otherwise cover the fittings so that moisture does not get into the building or conduit in the interim.

GASKET

CONNECTOR PLATE ASSEMBLY

NOTES:

1. Typical multi-function marking. Follow manufacturer’s configuration instructions to select Y2. Do not configure for O output.

2. W2 connection not required on units without electric heating.

Field Wiring

cannot be directly connected to the thermostat and will require a junction box and splice at the thermostat.

Typical

Thermostat

Connections

Central

Terminal

Board

Fig. 35 — Installing Thru-the Base Option

Check tightness of connector lock nuts before connecting

electrical conduits.

Field-supplied and field-installed liquid-tight conduit connectors and conduit may be attached to the connectors on the basepan. Pull correctly rated high voltage and low voltage through appropriate conduits. Connect the power conduit to the internal disconnect (if unit is so equipped) or to the external disconnect (through unit side panel). Remove one of the two knockouts located on the bottom left side of the unit control box. Use this hole for the control conduit.

UNITS WITHOUT THRU-BASE CONNECTIONS

1. Install power wiring conduit through side panel openings. Install conduit between disconnect and control box.

2. Install power lines to terminal connections as shown in Fig. 23.

FIELD CONTROL WIRING — The 50HC**14 unit requires an external temperature control device. This device can be a thermostat (field-supplied) or a PremierLink™ controller (available as factory-installed option or as field-installed accessory, for use on a Carrier Comfort Network

or as a stand alone control) or the RTU Open Controller for Building Management Systems using non-CCN protocols (RTU Open controller is available as a factory-installed option only).

THERMOSTAT — Select a Carrier-approved accessory thermostat. When electric heat is installed in the 50HC unit, the thermostat must be capable of energizing the G terminal (to energize the Indoor Fan Contactor) whenever there is a space call for heat (energizing the W1 terminal). The accessory thermostats listed on the unit price pages can provide this signal but they are not configured to enable this signal as shipped.

Install the accessory thermostat according to installation in-

structions included with the accessory.

Locate the thermostat accessory on a solid wall in the conditioned space to sense average temperature in accordance with the thermostat installation instructions.

If the thermostat contains a logic circuit requiring 24-v power, use a thermostat cable or equivalent single leads of different colors with minimum of seven leads. If the thermostat does not require a 24-v source (no “C” connection required), use a thermostat cable or equivalent with minimum of six leads. Check the thermostat installation instructions for additional features which might require additional conductors in the cable.

For wire runs up to 50 ft (15 m), use no. 18 AWG (American Wire Gage) insulated wire (35°C minimum). For 50 to 75 ft (15 to 23 m), use no. 16 AWG insulated wire (35°C minimum). For over 75 ft (23 m), use no. 14 AWG insulated wire (35°C minimum). All wire sizes larger than no. 18 AWG

O/B/Y2

(Note 1)

Note 1: Typical multi-function marking. Follow manufacturer’s configuration instructions to select Y2. Do not configure for O output.

Note 2: W2 connection not required on units without electric heating.

Field Wiring

(Note 2)

T H E R M O S T A T

Fig. 36 — Typical Low-Voltage Control

Connections

UNIT WITHOUT THRU-BASE CONNECTION KIT — Pass the thermostat control wires through the bushing on the

unit end panel. Route the wire through the snap-in wire tie and up to the web bushing near the control box. Route the wire through the bushing and into the bottom left side of the control box after removing one of the two knockouts in the corner of the box. Using a connector at the control box to protect the wire as it passes into the control box. Pull the wires over to the terminal strip at the upper left corner of the Central Terminal Board (CTB). Use the connector at the control box and the wire tie to take up any slack in the thermostat wire to ensure that it will not be damaged by contact with the condenser coil. See Fig. 37.

NOTE: If thru-the-bottom connections accessory is used, refer to the accessory installation instructions for information on routing power and control wiring.

Fig. 37 — Thermostat Wire Routing

+ 44 hidden pages

Carrier 50HC14 User Manual

CONTENTS

SAFETY CONSIDERATIONS

INSTALLATION

CURB-MOUNTED INSTALLATION

PAD-MOUNTED INSTALLATION

Step 4 — Provide Unit Support

Step 5 — Field Fabricate Ductwork

Step 8 — Install Outside Air Hood

ECONOMIZER HOOD REMOVAL AND SETUP — FACTORY OPTION

TWO POSITION DAMPER HOOD REMOVAL AND SETUP — FACTORY OPTION

Step 10 — Make Electrical Connections

CONVENIENCE OUTLETS

Thermostat

UNITS WITHOUT THRU-BASE CONNECTIONS