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50TCQ 15 and 20 Nominal TonsSingle Package RooftopHeat Pumpwith Puron (R --- 410A) RefrigerantSizes: 17 and 24

Electrical Data Supplement

FOR MODELS PRODUCED ON OR AFTER JULY 30, 2012 ONLY!

NOTE: Read the entire instruction manual before starting the installation

This supplement only applies to 50TCQ size 17 and 24 units manufactured on or after July 30, 2012. Toconfirm the date of manufacture of a 50TCQ unit, locate the unit nameplate and check the first four digitsof the Serial Number. If the number listed in the first 4 digits of the Serial Number is 3112 or higher KEEPTHIS DOCUMENT and use it along with the furnished Installation Instructions. See Fig. 1 for location of

the nameplate; the Serial Number is located directly below the units Model Number.

SERIAL NUMBER NOMENCLATURE

Week of manufacture

(fiscal calendar)

Manufacturing location

Sequence number

Year of manufacture

("12" = 2012)

Position:

Example:

1 2 3 4 5 6 7 8 9 10

3 1 1 2 U 1 2 3 4 5

C12562

To select which tables apply to a given unit, check the 7 th and 8th digits of the Model Number to determinethe units size (Cooling Tons) and the 17th digit to determine the units electrical option(s).

MODEL NUMBER NOMENCLATURE

5 0 T C Q D 2 4 A 2 A 6 A 0 A 3 G 0

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

Cooling Tons

17 - 15 ton

24 - 20 ton

Electrical Options

A = None

C = Non-Fused Disconnect

G = 2-Speed Indoor Fan (VFD) Controller

J = 2-Speed Fan Controller (VFD) and

Non-Fused Disconnect

Example:

Position:

C12568

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SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service,maintenance, or use can cause explosion, fire, electricalshock or other conditions which may cause personalinjury or property damage. Consult a qualified installer,service agency, or your distributor or branch forinformation or assistance. The qualified installer oragency must use factory--authorized kits or accessorieswhen modifying this product. Refer to the individualinstructions packaged with the kits or accessories wheninstalling.

Follow all safety codes. Wear safety glasses and workgloves. Use quenching cloths for brazing operations andhave a fire extinguisher available. Read these instructionsthoroughly and follow all warnings or cautions attached tothe unit. Consult local building codes and appropriatenational 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 . When you see this symbol on the

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

Understand the signal words DANGER, WARNING,CAUTION, and NOTE. These words are used with thesafety--alert symbol. DANGER identifies the most serioushazards which will result in severe personal injury ordeath. WARNING signifies hazards which couldresult inpersonal injury or death. CAUTION is used to identifyunsafe practices, which may result in minor personal

injury or product and property damage. NOTE is used tohighlight suggestions which will result in enhancedinstallation, reliability, or operation.

ELECTRICAL HAZARD

Failure to follow this caution may result in personalinjury or product and property damage.

The electrical data contained in this document is onlyfor use with 50TCQ size 17 and 24 unitsmanufactured on or after July 30, 2012. Check thefirst 4 digits of the units Serial Number (located onthe units nameplate) if the number listed is 3112 orhigher keep this document.

See Fig. 1 for location of the units nameplate. TheSerial Number is located directly below the unitsModel Number.

CAUTION!

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could cause personalinjury or death.

Before performing service or maintenance operationson unit, always turn off main power switch to unit andinstall lockout tag. Unit may have more than onepower switch.

! WARNING

Nameplate Location

C101297

Fig. 1 -- Location of Unit Nameplate

50TCQD17--24

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Legend and Notes for Tables 1 and 2

LEGEND:BRKR --- Circuit breakerCO --- Convenience outletDISC --- DisconnectFLA --- Full load ampsIFM --- Indoor fan motorLRA --- Locked rotor ampsMC A --- Minimu m cir cu it amp sPE --- Power exhaustPWRD CO --- Powered convenient outletUNPWR CO --- Unpowered convenient outletNOTES:

1. In compliance with NEC requirements for multimotor andcombination load equipment (refer to NEC Articles 430 and440), the overcurrent protective device for the unit shall befuse or HACR breaker. Canadian units may be fuse or circuitbreaker.

2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supplyvoltage is greater than 2%. Use the following formula to de-termine the percentage of voltage imbalance.

% Voltage Imbalance = 100 xmax voltage deviation from average voltage

average voltage

Example: Supply voltage is 230-3-60

AB = 224 v

BC = 231 v

AC = 226 v

Average Voltage =(224 + 231 + 226)

=681

3 3

= 227

Determine maximum deviation from average voltage.

(AB) 227 224 = 3 v(BC) 231 227 = 4 v

(AC) 227 226 = 1 v

Maximum deviation is 4 v.

Determine percent of voltage imbalance.

% Voltage Imbalance = 100 x4

227

= 1.76%

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

IMPORTANT: If the supply voltage phase imbalance is more than2%, contact your local electric utility company immediately.

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Copyright 2012 Carrier Corp. D 7310 W. Morris St. D Indianapolis, IN 46231 Edition Date: 07/12

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

Catalog No: 50TC---04SS

Replaces: New

50TCQD17--24