Carrier 50TC User Manual

50TC---*16

Single Package Rooftop Cooling Only with Puronr (R---410A) Refrigerant Size 16

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

(In Lieu of Curb or Slab Mount) 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 9..

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

Economizer Hood Removal and Setup —

Factory Option 9............................

Two Position Damper Hood Removal and Setup —

Factory Option 9............................

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

Step 9 -- Install External Condensate Trap and Line 11...

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

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

All Units 13................................

Units without Factory--Installed Disconnect 13....

Units with Factory--Installed Disconnect 13.......

Convenience Outlets 13.......................

Factory--Option Thru--Base Connections 15.......

Units without Thru--Base Connections 16.........

Field Control Wiring 16.......................

Thermostat 16...............................

Unit without Thru--Base Connection Kit 16.......

Heat Anticipator Settings 17...................

Electric Heaters 17..............................

Single Point Boxes 17..........................

Heater and Supplementary Fuses 17.............

Heater Low--Voltage Control Connections 18......

Humidi--MiZer

Humidi--MiZer -- Space RH Controller 19........

PremierLinkt (Factory Option) 21.................

Supply Air Temperature (SAT) Sensor 24.........

Outdoor Air Temperature (OAT) Sensor 24.......

EconoMi$er2 24.............................

Field Connections 24..........................

Space Sensors 26............................

Connect Thermostat 26.......................

Configure the Unit for Thermostat Mode 26......

Economizer Controls 27........................

Indoor Air Quality (CO

Outdoor Air Quality Sensor 27.................

Space Relative Humidity Sensor or

Humidistat Connections 28....................

Smoke Detector/Fire Shutdown (FSD) 29.........

Filter Status Switch 29........................

Supply Fan Status Switch 29...................

Remote Occupied Switch 29...................

Power Exhaust (output) 29.....................

CCN Communication Bus 30..................

RTU Open Control System 31.....................

Supply Air Temperature (SAT) Sensor 34.........

Outdoor Air Temperature (OAT) Sensor 34.......

EconoMi$er2 34.............................

Field Connections 34..........................

Space Temperature (SPT) Sensors 35............

Indoor Air Quality (CO

Control Connections 19..........

sensor) 27.............

)Sensor 35.............

Outdoor Air Quality Sensor 36.................

Space Relative Humidity Senor or Humidistat 36..

Smoke Detector/Fire Shutdown (FSD) 37.........

Connecting Discrete Inputs 37..................

Communication Wiring -- Protocols 38............

General 38.................................

Local Access 39.............................

RTU Open Troubleshooting 39.................

Outdoor Air Enthalpy Control 40..................

Differential Enthalpy Control 40................

Return Air Enthalpy Sensor 40.................

Smoke Detectors 41.............................

System 41..................................

Controller 41...............................

Sensor Module 41...........................

50TC--*16

Smoke Detector Locations 42....................

Supply Air 42...............................

Return Air without Economizer 42..............

Return Air with Economizer 42.................

Step 11 -- Adjust Factory--Installed Options 46........

Step 12 -- Install Accessories 47...................

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

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.

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.

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 air conditioning equipment.

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

50TC--*16

Horizontal Connections / Economizer

Fig. 1 -- Unit Dimensional Drawing – 16 Size Unit

C10770

50TC--*16

Fig. 1 -- Unit Dimensional Drawing – 16 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 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. 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, relief valves, or other sources of contaminated air.

C10858

18” (457)

42" (1067)

Required bottom condensate drain connection.

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

42" (1067)

C09897

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.

Table 1 – Operating Weights

50TC*D16

COMPONENT UNITS LB (KG)

Base Unit 1305 (593)

Economizer

Vertical 100 (45)

Horizontal 115 (52)

H u m id i --- M i Z erRSystem 62 (28)

Powered Outlet 32 (15)

Curb

14---in/356 mm 180 (82)

24---in/610 mm 235 (107)

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 Complete installation of the factory--installed

thru--the--base service connection option 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. 5. 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.

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 section:

S Factory--Option Thru--Base Connections

on page 15

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 (InLieuofCurborSlabMount)—

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.

50TC--*16

Fig. 3 -- Roof Curb Details

C10772

WARNING

Fig. 4 -- Unit Leveling Tolerances

MAXIMUM ALLOWABLE

DIFFERENCE IN. (MM)

A-B

0.5” (13)

B-C

1.0” (25)

A-C

1.0” (25)

C10001

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.

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 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.

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.

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.

CAUTION

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. 5 for additional information.

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.

CAUTION

50TC--*16

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

“B”

914 - 1371

( 36” - 54” )

“C”

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

“A”

SEE DETAIL “A”

MAX WEIGHT

LB KG IN MM IN MM IN MM

50TC--*16

UNIT

50TC---D16 2010 912 116.0 2945 57.5 1461 59.5 1510

NOTES:

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

2. Dimensions in ( ) are in millimeters.

3. Hook rigging shac k les through holes in base rail, as shown in detail “ A.” Holes in base rails are centered around the unit center of gravi t y. Use wood en top to prevent rigging st rap s from damaging unit.

PositioningonCurb—

For full perimeter curbs CRRFCURB074A00 and 075A00, the clearance between the roof curb and the front and rear

base rails should be the curb and the end base rails should be

/4in (6.4 mm). The clearance between

/2in (13 mm). For retrofit applications with curbs CRRFCURB003A01 and 4A01, the unit should be position as shown in Fig. 6.

Maintain the 15.5 in (394 mm) and 8

clearances and allow the 22

/16in (567 mm) dimension to

/8in (220 mm)

float if necessary.

DUCT END

A B C

Fig. 5 -- Rigging Details

DIMENSIONS

DETAIL “A”

Original Position

C10774

New Position (moved 12.5 in.)

C10003

Fig. 6 -- 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 duct end of the unit. (See Fig. 7.)

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

C10904

Fig. 7 -- Alternative Condensate Drain Hole Positions

IMPORTANT:

If the unit has the factory--installed Thru--the--Base option, make sure to complete installation of the option before placing the unit on the roof curb.

See the following section:

S Factory--Option Thru--Base Connections

on page 15

NOTE: If electrical connections 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.

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. 17 -- 19. 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 using accessory CRDUCTCV001A00. To convert to horizontal configuration, remove screws from side duct opening covers and remove covers.

Discard the supply duct cover. Install accessory CRDUCTCV001A00 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.

FILTER ACCESS PANEL

INDOOR COIL ACCESS PANEL

C10004

Fig. 9 -- Typical Access Panel Locations

50TC--*16

Fig. 8 -- Horizontal Conversion Panels

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. 9.)

3. Locate and cut the (2) plastic tie--wraps, being careful to not damage any wiring. (See Fig. 10.)

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.

Remove Hood Parts

Cut Plastic Ties (2) Places

Economizer

C06108

C10005

Fig. 10 -- 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. 9.)

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. 11.) 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, below.

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

Hood Parts

Plastic Tie Wrap Qty (2)

screws provided to attach the hood sides to the hood top. Use screws provided to attach the hood sides to the unit. See Fig. 13.

TOP PAN EL

INDOOR COIL ACCESS PANEL

SCREW

LEFT HOOD SIDE

50TC--*16

Screws for Metal Tray Qty (2)

Fig. 11 -- 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. 12.

SIDE PAN EL

RAIN DEFLECTORS

C10006

HOOD DIVIDER

C10008

Fig. 13 -- 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. 13 and 14. 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. 14.

DIVIDER

OUTSIDE AIR

TOP PAN EL

INDOOR COIL ACCESS PAN EL

C10007

INDOOR COIL ACCESS PAN EL

CAULK HERE

Fig. 12 -- Indoor Coil Access Panel Relocation

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

HOOD

CLEANABLE ALUMINUM FILTER

BAROMETRIC RELIEF

FILTER

Fig. 14 -- Economizer Filter Installation

7. Install the two rain deflectors on the edge of the hood topasshowninFig.12.

8. Caulk the ends of the joint between the unit top panel and the hood top as shown in Fig. 12.

9. Replace the filter access panel.

FILTER CLIP

C10009

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. 15. 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

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

CONDENSATE PAN (SIDE VIEW)

STANDARD SIDE DRAIN

Fig. 15 -- Condensate Drain Pan (Side View)

/2--in. square socket drive extension.

/2-- i n .

DRAIN

PLUG

(FACTORY-INSTALLED)

ALTERNATE BOTTOM DRAIN

C08021

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(33_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 Figs. 17, 18 and 19) to either the factory option disconnect or the bottom of the control box. 1” 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”, it must be field supplied. Figs. 17, 18 and 19 show the various wire routings.

50TC--*16

The piping for the condensate drain and external trap can be completed after the unit is in place. See Fig. 16.

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. 16 -- 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.).

(

C10010

Fig. 17 -- Conduit into Factory Option Disconnect

C10011

Fig. 18 -- Conduit into Control Box

Fig. 19 -- Conduit into Single Point Box

If the field disconnect is larger than 100A, it must be attached to the unit using accessory CRDISBKT001A00 — disconnect switch bracket — (see Fig. 20). Follow the instructions provided with this accessory. For smaller field

disconnects, be sure to use

50TC--*16

disconnect directly to the end panel, following the

/2” screws to mount the

instructions on the Field Disconnect Warning label (see Fig. 21). In either case, set the disconnect vertical location on the unit so that a 90_ fitting can be used to connect the conduit to the disconnect.

C10012

C10854

Fig. 21 -- 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 factory--installed option non--fused disconnect switch. Max wire size is #2 AWG (copper only). (See Fig. 23)

NOTE: TEST LEADS -- Unit may be equipped with short leads (pigtails) on the field line connection points off the 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

C10853

Fig. 20 -- Mounting Position for Field Disconnects

(over 100A)

FIRE HAZARD

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

Do not connect aluminum wire between disconnect switch and air conditioning unit. Use only copper wire.(SeeFig.22.)

ELECTRIC

DISCONNECT

SWITCH

COPPER

WIRE ONLY

ALUMINUM

WIRE

A93033

Fig. 22 -- Disconnect Switch and Unit

All Units —

Units with Factory--Installed Disconnect —

All field wiring must comply with the NEC and 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. Maximum wire size is 2/0 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.

Voltage to compressor terminals during operation must be within voltage range indicated on unit nameplate. See Table 9. 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 9 (see Note 2 on page 46) to determine the percent of voltage imbalance.

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 200-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.

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 Disconnect —

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.

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. 23). The factory disconnect is an 80A disconnect.

Units Without Disconnect Option

TB1

11 12 13

Disconnect

per

NEC

L2 L3

208/230-3-60

460-3-60 575-3-60

Units With Disconnect Option

Optional

Disconnect

Switch

Disconnect factory test leads; discard.

Factory

Wiring

C10015

Fig. 23 -- Power Wiring Connections

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 50TC--D16 : 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. 24.

50TC--*16

Pwd-CO

Fuse

Switch

Pwd-CO

Transformer

50TC--*16

Convenience

Outlet

GFCI

Disconnect

Access Panel

Fig. 24 -- Convenience Outlet Location

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.

C10857

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” long.

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. 25 -- Convenience Outlet Utilization Notice

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.

2.050HE501288

C10077

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 panel beneath the control box. See Fig. 24.

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 switch; 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. 26. 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.

C08283

UNIT

VOLTAGE

208, 230

460 480

575 600

CONNECT

240

PRIMARY

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. 26 -- 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 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.

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. 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. 27. 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

Factory--Option Thru--Base Connections —

This service connection kit consists of a1/2--in electrical

bulkhead connector and a 1

/2--in electrical bulkhead connector, connected to an “L” bracket covering the embossed (raised) section of the unit basepan in the

condenser section. See Fig. 28. The

/2--in bulkhead

connector enables the low--voltage control wires to pass

through the basepan. The 1

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

/2” ELECTRICAL BULKHEAD CONNECTOR

11/2” ELECTRICAL BULKHEAD CONNECTOR

C10907

Fig. 28 -- 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. 29.

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.

CONNECTOR PLATE ASSEMBLY

50TC--*16

BASE PLATE FOR GFCI RECEPTACLE

Fig. 27 -- Weatherproof Cover Installation

GASKET

C10908

Fig. 29 -- Installing Thru--the--Base Option

C09022

Check tightness of connector lock nuts before connecting electrical conduits.

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