Carrier 50HCQA User Manual

50HCQA Single Package Rooftop Heat Pump with Puronr (R --- 410A) Refrigerant S i z e s 0 4 --- 0 6

Installation Instructions

NOTE: Read the entire instruction manual before starting the installation

TABLE OF CONTENTS

SAFETY CONSIDERATIONS 2....................

INSTALLATION 4...............................

Jobsite Survey 4................................

Step 1 -- Plan for Unit Location 4..................

Roof Mount 5...............................

Step 2 -- Plan for Sequence of Unit Installation 5......

Curb--Mount Installation 5.....................

Pad--Mount Installation 5......................

Frame--Mount Installation 5....................

Step 3 -- Inspect Unit 5...........................

Step 4 -- Provide Unit Support 5...................

Roof Curb Mount 5..........................

Slab Mount (Horizontal Units Only) 5...........

Alternate Unit Support 5......................

Step 5 -- Field Fabricate Ductwork 7................

For Units with Accessory Electric Heaters 7......

Step 6 -- Rig and Place Unit 7.....................

Positioning on Curb 8........................

Step 7 -- Convert to Horizontal & Connect Ductwork 8..

Step 8 -- Install Outside Air Hood 9................

Economizer Hood Removal and Setup 9.........

Two Position Damper Hood Removal and Setup 9...

Economizer Hood and Two--Position Hood 10.....

Step 9 -- Install External Condensate Trap and Line 10...

Step 10 -- Make Electrical Connections 11...........

Field Power Supply 11........................

Units without Factory--Installed Disconnect 11....

Units with Factory--Installed Disconnect 12.......

Convenience Outlets 12.......................

Factory--Option Thru--Base Connections 13.......

Units without Thru--Base Connections 14.........

Field Control Wiring 14.......................

Thermostat 14...............................

Unit without Thru--Base Connection Kit 14.......

Heat Anticipator Settings 14...................

Electric Heaters 15..............................

Single Point Boxes and Supplementary Fuses 16.....

PremierLinkt (Factory Option) 17.................

Supply Air Temperature (SAT) Sensor 17.........

Outdoor Air Temperature (OAT) Sensor 19.......

EconoMi$ert219...........................

Field Connections 19..........................

Space Temperature (SPT) Sensors 19............

Connect Thermostat 19.......................

Configure the Unit for Thermostat Mode 22......

Economizer Controls 22........................

Outdoor Air Enthalpy Control 22...............

Differential Enthalpy Control 22................

Return Air Enthalpy Sensor 22 Indoor Air Quality (CO

Outdoor Air Quality Sensor 23.................

Smoke Detector/Fire Shutdown (FSD) 23.........

Filter Status Switch 24........................

Supply Fan Status Switch 24...................

Remote Occupied Switch 24...................

Space Relative Humidity Sensor 24.............

Power Exhaust (output) 24.....................

CCN Communication Bus 24..................

RTU--MP Control System 26......................

Supply Air Temperature (SAT) Sensor 28.........

Outdoor Air Temperature (OAT) Sensor 28.......

EconoMi$ert228...........................

Field Connections 29..........................

Space Sensors 29............................

Economizer Controls 29........................

Outdoor Air Enthalpy Control 29...............

Differential Enthalpy Control 29................

.................

sensor) 22.............

Return Air Enthalpy Sensor 29.................

Indoor Air Quality (CO

Outdoor Air Quality Sensor 30.................

Connecting Discrete Inputs 30..................

Communication Wiring -- Protocols 31............

General 31.................................

Local Access 32.............................

RTU--MP Troubleshooting 32..................

Smoke Detectors 33.............................

System 33..................................

Controller 33...............................

Sensor 33..................................

Smoke Detector Locations 34....................

Supply Air 34...............................

Return Air without Economizer 35..............

50HCQA

Return Air with Economizer 35.................

Step 11 -- Adjust Factory--Installed Options 42........

Step 12 -- Install Accessories 43...................

sensor) 30.............

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 lockout tag. Unit may have more than one power switch.

WARNING

UNIT OPERATION AND SAFETY HAZARD

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

Puronr (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.

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/NFPA70, 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

unit and in instructions or manuals, be alert to the potential for personal injury.

. When you see this symbol on the

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.

CAUTION

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 heat pump units.

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.

Vertical Connections / Economizer

50HCQA

Horizontal Connections / Economizer

Fig. 1 -- Unit Dimensional Drawing – 04 — 06 Size Units

C10230

50HCQA

C10231

Fig. 1 -- Unit Dimensional Drawing – 04 — 06 Size Unit (cont.)

INSTALLATION

Jobsite Survey

Complete the following checks before 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.

Step 1 — Plan for Unit Location

Select a location for the unit and its support system (curb or other) that provides for 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. 2.

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 or other sources of contaminated air.

18” (457)

42" (1067)

Required bottom condensate drain connection. Otherwise, 36” (914mm) for condensate connection.

18" (457)

C07459

Fig. 2 -- Service Clearance Dimensional Drawing

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 for removal and disposal of frost and ice that will form during the heating--defrost mode as well as allow installation of condensate trap per requirements. RefertoStep9—InstallExternalCondensate Trap and Line – for required trap dimensions.

Roof Mount —

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

Step 3 — Inspect unit

Inspect unit for transportation damage. File any claim with transportation agency.

Step 2 — Plan for Sequence of Unit Installation

The support method used for this unit will dictate different 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.

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.

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

Step 4 — Provide Unit Support

Roof Curb Mount —

Accessory roof curb details and dimensions are shown in Fig. 3. 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. 3. 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. 4. Refer to Accessory Roof Curb Installation Instructions for additional information as required.

Install insulation, cant strips, roofing felt, and counter flashing as shown. Ductwork must be attached to curb and

not to the unit. The accessory thru--the--base power package must be installed before the unit is set on the roof curb.

If electric and control wiring is to be routed through the basepan, attach the accessory thru--the--base service connections to the basepan in accordance with the accessory installation instructions.

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.

50HCQA

Table 1 – Operating Weights

50HCQA UNITS LB (KG)

Component 04 05 06

Base Unit 495 (225) 580 (263) 610 (277)

Economizer

Vertical 80 (36) 80 (36) 80 (36)

Horizontal 105 (48) 105 (48) 105 (48)

Powered Outlet 32 (15) 32 (15) 32 (15)

Curb

14---in / 356 mm 110 (50) 110 (50) 110 (50)

24---in / 610 mm 145 (66) 145 (66) 145 (66)

ROOFCURB ACCESSORY

CRRFCURB001A02

CRRFCURB002A02

1’ - 2” [356]

2’ - 0” [610]

UNIT SIZE

50HCQA04-06

50HCQA

Fig. 3 -- Roof Curb Details

C10232

MAXIMUM ALLOWABLE

DIFFERENCE IN. (MM)

A-B

0.5” (13)

Fig. 4 -- Unit Leveling Tolerances

B-C

1.0” (25)

A-C

1.0” (25)

C06110

Step 5 — Field Fabricate Ductwork

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.

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.

Step 6 — Rig and Place Unit

Keep unit upright and do not drop. Spreader bars are not required if top crating is left on unit. Rollers may be used to move unit across a roof. Level by using unit frame as a reference. See Table 1 and Fig. 5 for additional information.

50HCQA

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 Electric Heaters —

Horizontal applications require a minimum clearance to combustible surfaces of 1--in (25 mm) from duct for first 12--in (305 mm) away from unit. Vertical applications do not require a minimum clearance.

Minimum clearance is not required around ductwork. 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.

Lifting holes are provided in base rails as shown in Fig. 5. Refer to rigging instructions on unit.

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.

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

CAUTION

C06005

MAX WEIGHT

LB KG IN MM IN MM IN MM

50HCQA

UNIT

50HCQA04 725 330 74.5 1890 38.5 980 33.5 850

50HCQA05 845 384 74.5 1890 37.5 955 41.5 1055

50HCQA06 900 409 74.5 1890 37.5 955 41.5 1055

NOTES:

1. Dimensions in ( ) are in millimeters.

2. 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.

PositioningonCurb—

Position unit on roof curb so that the following clearances

are maintained:

/4in. (6.4 mm) clearance between the roof curb and the base rail inside the front and rear, 0.0 in. clearance between the roof curb and the base rail inside on the duct end of the unit. This will result in the distance between the roof curb and the base rail inside on the condenser end of the unit being approximately equal to Fig. 3, section C--C.

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

DIMENSIONS

A B C

Fig. 5 -- Rigging Details

After unit is in position, remove the compressor access panel. Holding the blocking between compressors with one hand, cut the strapping. Carefully remove the blocking without damaging tubing, wiring, or controls. Remove the strapping and replace the access panel.

Remove all shipping materials and top skid. Recycle or dispose of all shipping materials.

Step 7 — Convert to Horizontal and Connect Ductwork (when required)

Unit is shipped in the vertical duct configuration. Unit without factory--installed economizer or return air smoke detector option may be field--converted to horizontal ducted configuration. To convert to horizontal configuration, remove screws from side duct opening covers and remove covers. Using the same screws, install covers on vertical duct openings with the insulation--side down. Seals around duct openings must be tight. See Fig. 6.

C06108

Fig. 6 -- Horizontal Conversion Panels

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. 7.)

3. Locate and cut the (2) plastic tie--wraps, being careful to not damage any wiring. (See Fig. 8.)

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 10.

FILTERACCESS PANEL

COMPRESSOR ACCESS PANEL

OUTDOOR-AIR OPENING AND INDOOR COIL ACCESS PANEL

C06023

Fig. 7 -- Typical Access Panel Locations

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. 7.)

3. Locate the (2) screws holding the metal tray to the basepan and remove. Locate and cut the (2) plastic tie--wraps securing the assembly to the damper. (See Fig. 9.) 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 10.

50HCQA

Remove Hood Parts

Cut Plastic Ties (2) Places

Economizer

Hood Parts

Plastic Tie Wrap Qty (2)

Fig. 9 -- Damper Assembly

C08633

Fig. 8 -- Economizer Wiring

Screws for Metal Tray Qty (2)

C08639

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. Remove the screws along the sides and bottom of the indoor coil access panel. See Fig. 10.

SIDE PANEL

50HCQA

CAULK

INDOOR COIL ACCESS PANEL

HERE

Fig. 10 -- Indoor Coil Access Panel Relocation

2. Swing out indoor coil access panel and insert the hood sides under the panel (hood top). 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. 11.

INDOOR COIL ACCESS PANEL

TOP SIDE PANEL

INDOOR COIL ACCESS PANEL

TOP PANEL

C06025

filter rack (hood divider). Push the filter into position past the open filter clips. Close the filter clips to lock the filter into place. See Fig. 12.

DIVIDER

OUTSIDE AIR

HOOD

CLEANABLE

BAROMETRIC RELIEF

ALUMINUM FILTER

FILTER

FILTER CLIP

C08634

Fig. 12 -- Economizer Filter Installation

6. Caulk the ends of the joint between the unit top panel and the hood top.

7. Replace the filter access panel.

Step 9 — Install External Condensate Trap and Line

The unit has one3/4-in. condensate drain connection on the end of the condensate pan and an alternate connection on the bottom. See Fig. 13. Unit airflow configuration does not determine which drain connection to use. Either drain connection can be used with vertical or horizontal applications.

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.

LEFT HOOD SIDE

19 1/16”

(483mm)

HOOD DIVIDER

SCREW

33 3/8”

(848mm)

C06026

Fig. 11 -- Economizer Hood Construction

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

4. Insert the hood divider between the hood sides. See Fig. 11 and 12. Secure hood divider with 2 screws on each hood side. The hood divider is also used as the bottom filter rack for the aluminum filter.

5. Open the filter clips which are located underneath the hood top. Insert the aluminum filter into the bottom

To use the alternate bottom drain connection, remove the red drain plug from the bottom connection (use a1/2-- i n . square socket drive extension) and install it in the side drain connection.

CONDENSATE PAN (SIDE VIEW)

STANDARD SIDE DRAIN

DRAIN

PLUG

(FACTORY-INSTALLED)

ALTERNATE BOTTOM DRAIN

C08021

Fig. 13 -- Condensate Drain Pan (Side View)

The piping for the condensate drain and external trap can be completed after the unit is in place. See Fig. 14.

MINIMUM PITCH 1” (25mm) PER 10’ (3m) OF LINE

TO ROOF DRAIN

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

BASE RAIL

OPEN VENT

2˝ (51) MIN

DRAIN PLUG

SEE NOTE

ROOF CURB

C08022

Fig. 14 -- Condensate Drain Piping Details

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

/4-in.).

(

Step 10 — Make Electrical Connections

WARNING

ELECTRICAL SHOCK HAZARD

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

Do not use gas piping as an electrical ground. 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: Check all factory and field electrical connections for tightness. Field--supplied wiring shall conform with the limitations of 63_F(33_C) rise.

Field Power Supply —

If equipped with optional Powered Convenience Outlet: The power source leads to the convenience outlet’s transformer primary are not factory connected. Installer must connect these leads according to required operation of the convenience outlet. If an always--energized convenience outlet operation is desired, connect the source leads to the line side of the unit--mounted disconnect. (Check with local codes to ensure this method is acceptable in your area.) If a de--energize via unit disconnect switch operation of the convenience outlet is desired, connect the source leads to the load side of the

unit disconnect. On a unit without a unit--mounted disconnect, connect the source leads to compressor contactor C and indoor fan contactor IFC pressure lugs with unit field power leads.

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 connection and moving it to the 208-v

/4-in. female spade connector from the 230--v

/4-in. male

terminal on the primary side of the transformer. Refer to

unit label diagram for additional information. Field power wires will be connected line--side pressure lugs on the power terminal block or at factory--installed option non--fused disconnect.

Field power wires are connected to the unit at line--side pressure lugs on compressor contactor C and indoor fan contactor IFC or terminal board (see wiring diagram label for control box component arrangement) or at factory--installed option non--fused disconnect switch. Max wire size is #2 AWG (copper only). (See Fig. 16)

NOTE: TEST LEADS -- Unit may be equipped with short leads (pigtails) on the field line connection points on contactor C or optional disconnect switch. 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.

WARNING

FIRE HAZARD

Failure to follow this warning could result in intermittent operation or performance satisfaction.

Do not connect aluminum wire between disconnect switch and furnace. Use only copper wire. (See Fig. 15.)

ELECTRIC

DISCONNECT

SWITCH

COPPER

WIRE ONLY

ALUMINUM

WIRE

A93033

Fig. 15 -- Disconnect Switch and Unit

Units Without Factory--Installed Disconnect —

When installing units, provide a disconnect switch per NEC (National Electrical Code) of adequate size. 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.

50HCQA

Units with Factory--Installed Disconnect —

Convenience Outlets —

The factory--installed option disconnect switch is located in a weatherproof enclosure located under the main control box. The manual switch handle is accessible through an opening in the access panel. Discard the factory test leads (see Fig. 16).

Units Without Disconnect Option

IFC

(3 Phase

Indoor Motor)

11 23

Disconnect

per

NEC

208/230-1-60

50HCQA

11 13 13

Disconnect

per

NEC

L2 L3

208/230-3-60

460-3-60 575-3-60

(1 Phase Indoor Motor

and 3 Phase Unit)

Units With Disconnect Option

Optional

Disconnect

Switch

Factory

Wiring

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. Tag--out this switch, if necessary.

Two types of convenience outlets are offered on 50HCQA 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 end panel of the unit. See Fig. 17.

Pwd-CO

Convenience

Outlet

GFCI

Pwd-CO

Fuse

Switch

Transformer

Disconnect factory test leads; discard.

C10241

Fig. 16 -- Power Wiring Connections

All Units: All field wiring must comply with NEC and all

local codes. Size wire based on MCA (Minimum Circuit Amps) on the unit informative plate. See Fig. 16 and the unit label diagram for power wiring connections to the unit power terminal blocks and equipment ground. Maximum wire size is #2 ga AWG per pole.

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.

All field wiring must comply with the NEC and local requirements.

Control Box

Access Panel

C08128

Fig. 17 -- Convenience Outlet Location

Installing Weatherproof Cover: A weatherproof

while-in-use cover for the factory-installed convenience outlets is now required by UL standards. This cover cannot be factory-mounted 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.

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. 18. 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 INCLUDED

BASE PLATE FOR GFCI RECEPTACLE

C09022

Fig. 18 -- Weatherproof Cover Installation

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, 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--powered type: A unit--mounted transformer is factory--installed to stepdown the main power supply 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. 17.

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 unit--mounted non--fused disconnect or HACR breaker switch; this will provide service power to the unit when the unit disconnect switch or HACR switch is open. Other connection methods will result in the convenience outlet circuit being de--energized when the unit disconnect or HACR switch is open. See Fig. 19.

Duty Cycle: the unit--powered convenience outlet has a duty cycle limitation. The transformer is intended to provide power on an intermittent basis for service tools, lamps, etc; it is not intended to provide 15--amps loading for continuous duty loads (such as electric heaters for overnight use). Observe a 50% limit on circuit loading above 8--amps (i.e., limit loads exceeding 8--amps to 30 minutes of operation every hour).

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.

C08283

UNIT

VOLTAGE

208, 230

460 480

575 600

CONNECTASPRIMARY

240

CONNECTIONS

L1: RED +YEL L2: BLU + GRA

L1: RED Splice BLU + YEL L2: GRA

L1: RED L2: GRA

TRANSFORMER

TERMINALS

H1 + H3 H2 + H4

H2 + H3

H1 H2

Fig. 19 -- Powered Convenience Outlet Wiring

Using unit--mounted convenience outlets: Units with unit--mounded 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.

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

Factory--Option Thru--Base Connections —

This service connection kit consists of a

bulkhead connector and a

/4--in electrical bulkhead

/2--in electrical

connector, all factory--installed in the embossed (raised) section of the unit basepan in the condenser section. The

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

wires to pass through the basepan. The

/4--in electrical bulkhead connector allows the high--voltage power wires to pass through the basepan. See Fig. 20.

Check tightness of connector lock nuts before connecting electrical conduits.

50HCQA

LOW VOLTAGE CONDUIT CONNECTOR

HIGH VOLTAGE CONDUIT CONNECTOR

electronic thermostat, configure it for “non--heat pump” operation. 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.

Fig. 20 -- Thru--Base Connection Fittings

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

50HCQA

conduit to the internal disconnect (if unit is so equipped) or to the external disconnect (through unit side panel). A hole must be field cut in the main control box bottom on the left side so the 24--v control connections can be made. Connect the control power conduit to the unit control box at this hole.

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. 16.

All Units: Voltage to compressor terminals during operation must be within voltage range indicated on unit nameplate. See Table 10. On 3--phase units, voltages between phases must be balanced within 2% and the current within 10%. Use the formula shown in the legend for Table 10, Note 2 (see page 42) to determine the percent of voltage imbalance. 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.

Field Control Wiring —

C08637

For wire runs up to 50 ft. (15 m), use no. 18 AWG (American Wire Gage) insulated wire (35_C minimum). For50to75ft.(15to23m),useno.16AWGinsulated 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 cannot be directly connected to the thermostat and will require a junction box and splice at the thermostat.

Terminal

Central

Board

T H E R M O S T A T

C09012

Typical

Thermostat

Connections

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)

Fig. 21 -- Typical Low--Voltage Control Connections

The 50HCQA 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--MP Controller for Building Management Systems using non--CCN protocols (RTU--MP is available as a factory--installed option only).

Thermostat —

Install a Carrier--approved accessory 2 stage Cooling/Heating thermostat according to installation instructions included with the accessory. The 50HCQ models do not require a thermostat with an O function to control the reversing valve operation. If using an

Unit without Thru--Base Connection Kit —

Pass the thermostat control wires through the hole provided in the corner post; then feed the wires through the raceway built into the corner post to the control box. Pull the wires over to the terminal strip on the upper--left corner of the Central Terminal Board (CTB). See Fig. 22.

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

Heat Anticipator Settings —

Set heat anticipator settings at 0.14 amp for the first stage and 0.14 amp for second--stage heating, when available.

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