Product Data. 50ZH Single-Packaged Heat Pumps. 2 to 5 Tons. Features/Benefits

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1 Product Data 50ZH Single-Packaged Heat Pumps 2 to 5 Tons Single-Package Heat Pump Units with: easy installation design corrosion-proof basepan redesigned aerodynamic fan blade for reduced sound sloped drain for improved indoor air quality scroll compressors through-the-top service access louvered panel coil protection UNIT 50ZH Features/Benefits Compact, horizontal supply and return unit, combining easy installation and maintenance with efficient performance. EASY TO INSTALL The 50ZH units are lightweight, compact singlepackage units that are easy to handle. Every 50ZH unit has an identical 32 by 51-in. footprint to make jobsite planning simple. The precise design uses less sheet metal and makes the 50ZH units lighter than other units. The unit can be easily positioned on the jobsite with the hand-holds built into the unit basepan. Drop-in cartridge style heaters are utilized to minimize installation time. REDESIGNED AERODYNAMIC FAN BLADE DESIGN reduces overall sound by up to 3dB; now as low as 76dB. TOP COVER SERVICE ACCESS The 50ZH units are designed to be serviced from the top. The split-top design allows easy access for installation and maintenance procedures on the unit. Routine maintenance tasks such as coil cleaning are sped up with through-thetop access. Multiple side panels do not need to be removed as with other units. CORROSION PROOF BASEPAN The 50ZH unit features a tough, hightech, single-piece, composite material basepan with an integrated drain. The composite material eliminates the potential problem of rust and premature replacement which are common with standard metal pans. Each 50ZH unit basepan is sloped to eliminate standing water. This feature minimizes the Copyright 2001 Carrier Corporation Form 50ZH-3PD

2 amount of standing water inside the unit, which limits mold and mildew growth. DURABLE STEEL CABINET The watertight construction and corrosionresistant finish of the 50ZH unit will keep it looking like new for years. A specialized paint treatment process ensures quality protection against the elements. A compact, low-profile design utilizes a louvered coil enclosure for maximum protection against hail damage and vandalism. SCROLL COMPRESSORS Each 50ZH unit comes standard with a high reliability design scroll compressor. Each scroll compressor is hermetically sealed against contamination to help promote longer life and dependable operation. All scroll compressors have internal high-pressure and overcurrent protection. COIL EFFICIENCY Indoor and outdoor coils are computer designed for optimum heat transfer and cooling efficiency. CHRONOTEMP DEFROST SYSTEM The system provides time/ temperature-based defrost cycles to maintain unit efficiency. This highly reliable system checks for coil icing conditions at preset intervals and initiates a defrost cycle only if it is required. The defrost cycle ends as soon as defrosting is accomplished. Each defrost board is also equipped with 5- minute compressor time delay protection. ACCESSORY ELECTRIC HEATERS A variety of accessory electric supplementary heaters are available for the 50ZH units. Each heater is a drop-in style cartridge type with single-point electrical connections for both the heater and the unit. STARTER COLLARS Starter collars are provided with each unit to provide easy connection to the structure ductwork. DEPENDABLE COMPONENTS Direct-drive multispeed, PSC (permanent split capacitor) blower motor is standard on all models. Direct-drive, PSC outdoor-fan motors are designed to help reduce energy consumption and provide for cooling operation down to 40 F. Refrigerant system is designed to provide dependability. Liquid refrigerant strainers are used to promote clean, unrestricted operation. Each unit leaves the factory with a full refrigerant charge and is fully run tested. Refrigerant service connections make checking operating pressure easier. MODEL NUMBER NOMENCLATURE 50ZH 3 X 024 A A Model No. 50ZH Single Package Heat Pump Unit Electrical Supply 3 208/ / N/A Series A Original Brand Name A Common Unit N/A Nominal Cooling Capacity Tons /2 Tons Tons /2 Tons Tons Tons Table of contents Page Features/Benefits Model Number Nomenclature ARI Capacities Physical Data Accessories , 5 Base Unit Dimensions Selection Procedure Performance Data Electrical Data Typical Wiring Schematics Controls Typical Piping and Wiring Guide Specifications , 25 2

3 ARI* capacities UNIT 50ZH NOMINAL TONS COOLING CAPACITIES AND EFFICIENCIES STANDARD CFM NET COOLING CAPACITIES AT 95 F (Btuh) SEER NET HEATING CAPACITIES AT 47 F (Btuh) HSPF HIGH HEAT COP AT 47 F SOUND RATINGS** (db) , , , , , , , , TT 46, , , , LEGEND db Sound Levels (decibels) HSPF Heating Seasonal Performance Factor SEER Seasonal Energy Efficiency Ratio COP Coefficient of Performance * Air Conditioning & Refrigeration Institute. Rated in accordance with U.S. Government DOE (Department of Energy) test procedures and/or ARI Standard 210/ ** Rated in accordance with ARI Standard MANUFACTURER CERTIFIED TO ARI AS COMPLYING WITH ARI UNITARY EQUIPMENT AIR CONDITIONING STANDARD 210 MANUFACTURER CERTIFIED TO ARI AS COMPLYING WITH ARI SOUND RATING UNITARY OF OUTDOOR EQUIPMENT STANDARD 270 A2325 Physical data UNIT SIZE 50ZH OPERATING WEIGHT (lb) COMPRESSOR TYPE Scroll REFRIGERANT R-22 CHARGE (lb) REFRIGERANT METERING DEVICE Acutrol System OUTDOOR COIL Copper Tubes, Aluminum Plate Fins RowsFins/in. Face Area (sq ft) OUTDOOR-FAN MOTOR Nominal Cfm Nominal Rpm Motor Hp (Rpm) Diameter (in.) EVAPORATOR COIL RowsFins/in. Face Area (sq ft) EVAPORATOR-FAN MOTOR Blower Motor Size (in.) Nominal Cfm Rpm Range Number of Speeds Factory Speed Setting Motor Hp / x Low 1/ / x Med 1/ Propeller / /4 20 Copper Tubes, Aluminum Plate fins Direct Drive 10 x Low 1/ x Med 1/2 * Required filter sizes shown are based on the ARI (Air Conditioning & Refrigeration Institute) rated cooling airflow at a velocity of 300 ft/minute for throwaway type or 450 ft/minute for high-capacity type. Recommended filters are 1-in. thick / x Low 3/ / x Low 1 CONNECTING DUCT SIZES Round Square Supply Air (in.) Return Air (in.) FIELD-SUPPLIED RETURN AIR FILTER* Throwaway (in.) x x x 24 x 1 24 x 24 x 1 24 x 24 x 1 24 x 24 x 1 24 x 30 x 1 24 x 30 x 1 3

4 Accessories ACCESSORY MotorMaster II Low Ambient Control allows unit to run at outdoor temperatures down to 0 F. Controls Upgrade Kit provides high and low pressure safety protection and protects the unit from operating in unsuitable conditions. Crankcase Heater provides anti-floodback protection for low load applications. Outdoor Thermostat Corporate Thermostat Electric Heat with Single-Point Kit (5.0 to 20.0 kw) Corporate Thermostat provides heating and cooling unit control. The thermostat provides system and fan switching. Electric Heaters provide heat in the unit when required. Each package has a heater module that slides into keyed mounting slots in the fan inlet. Heater sizes range from 5.0 to 20.0 kw. The electric heater design allows the use of a single-point power supply for the entire unit, resulting in lower installed costs. Outdoor Thermostat brings second stage of 2-stage electric heater on line when the outdoor-air temperature falls below the set point. Accessory electric heater usage ODS CATALOG ORDERING NO. ODS Order Distribution System NOMINAL CAPACITY USED WITH SIZES ELECTRIC HEATERS ( ) CPHEATER026A00 5 kw X X X X CPHEATER038A00 5 kw X X CPHEATER024A00 10 kw X X X X X X CPHEATER040A00 15 kw X X X X X CPHEATER028A00 20 kw X X X ELECTRIC HEATERS ( ) CPHEATER029A00 5 kw X X X X CPHEATER030A00 10 kw X X X X CPHEATER032A00 15 kw X X X X CPHEATER041A00 20 kw X X X ELECTRIC HEATERS ( ) CPHEATER034A00 5 kw X X X X CPHEATER035A00 10 kw X X X X CPHEATER036A00 15 kw X X X X CPHEATER037A00 20 kw X X X 4

5 Accessories (cont) MULTIPLICATION FACTORS HEATER kw RATING VOLTAGE DISTRIBUTION V/3/ ODS Order Distribution System MULTIPLICATION FACTOR Example: 15.0 kw (at 240 v) heater on 208 v = 15.0 (.75 mult factor) = capacity at 208 v Balance Point Worksheet Building Heat Loss, BTUH Unit Integrated Heating Capacity (BTUH) Outdoor Air Temp (Deg F) 50ZH Balance Point Worksheet 5

6 Base unit dimensions50zh024, 030 REQUIRED CLEARANCE TO COMBUSTIBLE MATL. INCHES [mm] TOP OF UNIT...0 DUCT SIDE OF UNIT...0 SIDE OPPOSITE DUCTS...0 BOTTOM OF UNIT...0 NEC. REQUIRED CLEARANCES. INCHES [mm] BETWEEN UNITS, POWER ENTRY SIDE [1066.8] UNIT AND UNGROUNDED SURFACES, POWER ENTRY SIDE [914.0] UNIT AND BLOCK OR CONCRETE WALLS AND OTHER GROUNDED SURFACES, POWER ENTRY SIDE [1066.8] REQUIRED CLEARANCE FOR OPERATION AND SERVICING INCHES [mm] CONDENSER. COIL ACCESS SIDE [762.0] POWER ENTRY SIDE [762.0] (EXCEPT FOR NEC REQUIREMENTS) UNIT TOP [1219.2] SIDE OPPOSITE DUCTS [762.0] LEGEND NEC National Electrical Code NOTES: 1. Clearances must be maintained to prevent recirculation of air from outdoorfan discharge, with the exception of the condenser coil (36.00 in [914.0 mm]. A removable fence or barricade requires no clearance. 2. Dimensions are in inches. Dimensions in [ ] are in millimeters. UNIT ELECTRICAL UNIT WEIGHT CENTER OF GRAVITY mm (in.) CHARACTERISTICS Lb Kg X Y Z 50ZH / (14.0) 483 (19.0) 305 (12.0) 50ZH / (14.0) 483 (19.0) 305 (12.0) 6

7 Base unit dimensions50zh REQUIRED CLEARANCE TO COMBUSTIBLE MATL. INCHES [mm] TOP OF UNIT...0 DUCT SIDE OF UNIT...0 SIDE OPPOSITE DUCTS...0 BOTTOM OF UNIT...0 NEC. REQUIRED CLEARANCES. INCHES [mm] BETWEEN UNITS, POWER ENTRY SIDE [1066.8] UNIT AND UNGROUNDED SURFACES, POWER ENTRY SIDE [914.0] UNIT AND BLOCK OR CONCRETE WALLS AND OTHER GROUNDED SURFACES, POWER ENTRY SIDE [1066.8] REQUIRED CLEARANCE FOR OPERATION AND SERVICING INCHES [mm] CONDENSER. COIL ACCESS SIDE [762.0] POWER ENTRY SIDE [762.0] (EXCEPT FOR NEC REQUIREMENTS) UNIT TOP [1219.2] SIDE OPPOSITE DUCTS [762.0] LEGEND NEC National Electrical Code NOTES: 1. Clearances must be maintained to prevent recirculation of air from outdoorfan discharge, with the exception of the condenser coil (36.00 in [914.0 mm]. A removable fence or barricade requires no clearance. 2. Dimensions are in inches. Dimensions in [ ] are in millimeters. UNIT ELECTRICAL UNIT WEIGHT CENTER OF GRAVITY mm (in.) CHARACTERISTICS Lb Kg X Y Z 50ZH / , 208/ , (14.0) 483 (19.0) 381 (15.0) 50ZH / , 208/ , (14.0) 483 (19.0) 381 (15.0) 50ZH / , 208/ , (14.0) 483 (19.0) 381 (15.0) 7

8 Base unit dimensions50zh060 REQUIRED CLEARANCE TO COMBUSTIBLE MATL. INCHES [mm] TOP OF UNIT...0 DUCT SIDE OF UNIT...0 SIDE OPPOSITE DUCTS...0 BOTTOM OF UNIT...0 NEC. REQUIRED CLEARANCES. INCHES [mm] BETWEEN UNITS, POWER ENTRY SIDE [1066.8] UNIT AND UNGROUNDED SURFACES, POWER ENTRY SIDE [914.0] UNIT AND BLOCK OR CONCRETE WALLS AND OTHER GROUNDED SURFACES, POWER ENTRY SIDE [1066.8] REQUIRED CLEARANCE FOR OPERATION AND SERVICING INCHES [mm] CONDENSER. COIL ACCESS SIDE [762.0] POWER ENTRY SIDE [762.0] (EXCEPT FOR NEC REQUIREMENTS) UNIT TOP [1219.2] SIDE OPPOSITE DUCTS [762.0] LEGEND NEC National Electrical Code NOTES: 1. Clearances must be maintained to prevent recirculation of air from outdoorfan discharge, with the exception of the condenser coil (36.00 in [914.0 mm]. A removable fence or barricade requires no clearance. 2. Dimensions are in inches. Dimensions in [ ] are in millimeters. ELECTRICAL UNIT WEIGHT CENTER OF GRAVITY mm (in.) UNIT CHARACTERISTICS V-Ph-Hz Lb Kg X Y Z 50ZH / , 208/ , (14.00) 508 (20.00) 406 (16.00) 8

9 Selection Procedure I DETERMINE COOLING AND HEATING REQUIREMENTS AT DESIGN CONDITIONS: Given: Required Cooling Capacity (TC) ,000 Btuh Sensible Heat Capacity (SHC) ,500 Btuh Required Heating Capacity ,550 Btuh Outdoor Entering-Air Temperature F Outdoor-Air Winter Design Temperature F Indoor-Air Winter Design Temperature F Indoor Entering-Air Temperature F edb, 67 F ewb Indoor-Air Quantity cfm External Static Pressure in. wg Electrical Characteristics (V-Ph-Hz) edb entering dry bulb ewb entering wet bulb II SELECT UNIT BASED ON REQUIRED COOLING CAPACITY. Enter Cooling Capacities table at condenser entering temperature of 95 F, indoor air entering at 1125 cfm and 67 F ewb (entering wet bulb). The 50ZH030 unit will provide a total cooling capacity of 28,800 Btuh and a sensible heat capacity of 21,700 Btuh. For indoor-air temperature other than 80 F edb (entering dry bulb), calcualte sensible heat capacity correction, as required, using the formula found in Note 3 following the cooling capacities tables. NOTE: Unit ratings are net capacities. III SELECT ELECTRIC HEAT. Enter the 50ZH030 Heating Capacities table at 1125 cfm. At 70 F return indoor air and 20 F air entering outdoor coil, the inegrated heating capacity is 15,500 Btuh. (Select integrated heating capacity value since deductions for outdoor-coil frost and defrosting have already been made. No correction is required.) The required heating capacity is 28,550 Btuh. Therefore, 13,050 Btuh (28,550 15,500) additional electric heat is required. Determine additional electric heat capacity in kw. 13,050 Btuh = 3.8 kw of heat required 3414 Btuh/kw Enter the Accessory Electric Heater Usage table on page 4 for 208/240 v. single-phase, 50ZH030 unit. The 5-kW heater at 240 v most closely satisfies the heating required. To calculate kw at 230 v, multiply the heater kw by multiplication factor 0.92 found in the Multiplication Factors table on page 5. 5 kw x 0.92 = 4.6 kw 4.6 x 3414 = 15,704 Btuh To calculate kw at 208 v, see Multiplication Factors table on page 5. Total unit heating capacity is 31,204 Btuh (15, ,704). IV DETERMINE FAN SPEED AND POWER REQUIREMENTS AT DESIGN CONDITIONS. Before entering the air delivery tables, calculate the total static pressure required. From the given, the Accessory Electric Heat Pressure Drop table, Wet Coil Pressure Drop table, and the Filter Pressure Drop table, find: External static pressure 0.20 in. wg Filter 0.09 in. wg Electric heat 0.11 in. wg Wet coil 0.07 in. wg Total static pressure 0.47 in. wg Enter the table for Dry Coil Air Delivery Horizontal Discharge at 1125 cfm and 230-v high speed. By interpolation, the standard motor will deliver 0.48 in. wg static pressure. This will adequately handle job requirements. 9

10 Performance data 50ZH024 (2 TONS) Temp (F) Air Ent Outdoor coil (edb) See page 16 for cooling notes. COOLING CAPACITY Evaporator AirCFM/BF 700/ / /0.15 Evaporator Air Ewb (F) * * * 62 TC SHC kw TC SHC kw TC SHC kw TC SHC kw ZH024 Temp (F) Air Ent Indoor Coil Indoor Air CFM (Std) HEATING CAPACITY Air Temperature Entering Outdoor Coil (F db at 70% rh) Cap kw Cap kw Cap kw Cap kw Cap kw Cap kw Cap kw Cap kw Cap kw LEGEND Cap. Heating Capacity (1000 Btuh) (Includes Indoor-Fan Motor Heat) db Dry Bulb kw Total Power Input (Includes Compressor Motor Power Input Outdoor-Fan Motor Input, and Indoor-Fan Motor Input) rh Relative Humidity NOTES: 1. indicates integrated ratings 2. Integrated capacity is maximum (instantaneous) capacity less the effect of frost on the outdoor coil and the heat required to defrost it. 10

11 Performance data (cont) 50ZH030 (2-1/2 TONS) Temp (F) Air Ent Outdoor coil (edb) See page 16 for cooling notes. COOLING CAPACITY Indoor Entering AirCFM/BF 875/ / /0.12 Indoor Entering Air Ewb (F) * * * 62 TC SHC kw TC SHC kw TC SHC kw TC SHC kw HEATING CAPACITY 50ZH030 Temp (F) Air Ent Indoor Coil Indoor Air CFM (Std) Air Temperature Entering Outdoor Coil (F db at 70% rh) Cap kw Cap kw Cap kw Cap kw Cap kw Cap kw Cap kw Cap kw Cap kw LEGEND Cap. Heating Capacity (1000 Btuh) (Includes Indoor-Fan Motor Heat) db Dry Bulb kw Total Power Input (Includes Compressor Motor Power Input Outdoor-Fan Motor Input, and Indoor-Fan Motor Input) rh Relative Humidity NOTES: 1. indicates integrated ratings 2. Integrated capacity is maximum (instantaneous) capacity less the effect of frost on the outdoor coil and the heat required to defrost it. 11

12 Performance data (cont) 50ZH036 (3 TONS) Temp (F) Air Ent Outdoor coil (edb) See page 16 for cooling notes. COOLING CAPACITY Evaporator AirCFM/BF 1050/ / /0.12 Evaporator Air Ewb (F) * * * 62 TC SHC kw TC SHC kw TC SHC kw TC SHC kw HEATING CAPACITY 50ZH036 Temp (F) Air Ent Indoor Coil Indoor Air CFM (Std) Air Temperature Entering Outdoor Coil (F db at 70% rh) Cap kw Cap kw Cap kw Cap kw Cap kw Cap kw Cap kw Cap kw Cap kw LEGEND Cap. Heating Capacity (1000 Btuh) (Includes Indoor-Fan Motor Heat) db Dry Bulb kw Total Power Input (Includes Compressor Motor Power Input, Outdoor-Fan Motor Input, and Indoor-Fan Motor Input) rh Relative Humidity NOTES: 1. indicates integrated ratings. 2. Integrated capacity is maximum (instantaneous) capacity less the effect of frost on the outdoor coil and the heat required to defrost it. 12

13 Performance data (cont) 50ZH042 (3-1/2 TONS) Temp (F) Air Ent Outdoor coil (edb) See page 16 for cooling notes. COOLING CAPACITY Indoor Entering CFM/BF 1225/ / /0.14 Indoor Entering Ewb (F) * * * 62 TC SHC kw TC SHC kw TC SHC kw TC SHC kw HEATING CAPACITY 50ZH042 Temp (F) Air Ent Indoor Coil Indoor Air CFM (Std) Air Temperature Entering Outdoor Coil (F db at 70% rh) Cap kw Cap kw Cap kw Cap kw Cap kw Cap kw Cap kw Cap kw Cap kw LEGEND Cap. Heating Capacity (1000 Btuh) (Includes Indoor-Fan Motor Heat) db Dry Bulb kw Total Power Input (Includes Compressor Motor Power Input Outdoor-Fan Motor Input, and Indoor-Fan Motor Input) rh Relative Humidity NOTES: 1. indicates integrated ratings 2. Integrated capacity is maximum (instantaneous) capacity less the effect of frost on the outdoor coil and the heat required to defrost it. 13

14 Performance data (cont) 50ZH048 (4 TONS) Temp (F) Air Ent Outdoor coil (edb) See page 16 for cooling notes. COOLING CAPACITY Indoor EnteringCFM/BF 1800/ / /0.06 Indoor Entering Air Ewb (F) * * * 62 TC SHC kw TC SHC kw TC SHC kw TC SHC kw HEATING CAPACITY 50ZH048 Temp (F) Air Ent Indoor Coil Indoor Air CFM (Std) Air Temperature Entering Outdoor Coil (F db at 70% rh) Cap kw Cap kw Cap kw Cap kw Cap kw Cap kw Cap kw Cap kw Cap kw LEGEND Cap. Heating Capacity (1000 Btuh) (Includes Indoor-Fan Motor Heat) db Dry Bulb kw Total Power Input (Includes Compressor Motor Power Input, Outdoor-Fan Motor Input, and Indoor-Fan Motor Input) rh Relative Humidity NOTES: 1. indicates integrated ratings 2. Integrated capacity is maximum (instantaneous) capacity less the effect of frost on the outdoor coil and the heat required to defrost it. 14

15 Performance data (cont) 50ZH060 (5 TONS) Temp (F) Air Ent Outdoor coil (edb) See page 16 for cooling notes. COOLING CAPACITY Evaporator AirCFM/BF 1400/ / /0.09 Evaporator Air Ewb (F) * * * 62 TC SHC kw TC SHC kw TC SHC kw TC SHC kw HEATING CAPACITY 50ZH060 Temp (F) Air Ent Indoor Coil Indoor Air CFM (Std) Air Temperature Entering Outdoor Coil (F db at 70% rh) Cap kw Cap kw Cap l kw Cap kw Cap kw Cap kw Cap kw Cap kw Cap kw LEGEND Cap. Heating Capacity (1000 Btuh) (Includes Indoor-Fan Motor Heat) db Dry Bulb kw Total Power Input (Includes Compressor Motor Power Input Outdoor-Fan Motor Input, and Indoor-Fan Motor Input) rh Relative Humidity NOTES: 1. indicates integrated ratings 2. Integrated capacity is maximum (instantaneous) capacity less the effect of frost on the outdoor coil and the heat required to defrost it. 15

16 BF edb Ewb kw Idb Iwb SHC TC LEGEND Bypass Factor Entering Dry-Bulb Entering Wet-Bulb Total Unit Power Input Leaving Dry-Bulb Leaving Wet-Bulb Sensible Heat Capacity (1000 Btuh) Net Total Capacity (1000 Btuh) Net *At 75 F entering dry bulb (Tennessee Valley Authority [TVA] rating conditions); all others at 80 F entering dry bulb. NOTES: 1. Direct interpolation is permissible. Do not extrapolate. 2. The following formulas may be used: t ldb = t edb sensible capacity (Btuh) 1.10 x cfm t lwb = Wet-bulb temperature corresponding to enthalpy of leaving indoor coil (h lwb ) total capacity (Btuh) h lwb = h ewb 4.5 x cfm Where: h ewb = Enthalpy of air entering evaporator coil 3. The sensible heat capacity is based on 80 F edb temperature of air entering indoor coil. Below 80 F edb, subtract (corr factor x cfm) from the sensible heat capacity. Above 80 F edb, add (corr factor x cfm) to the sensible heat capacity. Correction Factor = 1.10 x (1 BF) x (edb 80). WET COIL PRESSURE DROP UNIT SIZE 50ZH AIRFLOW (cfm) PRESSURE DROP (in. wg) UNIT SIZE 50ZH FILTER SIZE (in.) FILTER PRESSURE DROP (in. wg) CFM x , x ACCESSORY ELECTRIC HEAT PRESSURE DROP (in. wg) HEATER CFM kw

17 Performance data (cont) 230 AND 460 VOLT HORIZONTAL DISCHARGE Unit 50ZH Motor Speed Low Med High Low Med High Low Med High Low Med High Low High Low Med High DRY COIL AIR DELIVERY* HORIZONTAL DISCHARGE (Deduct 10% for 208 Volt Operation) Air Delivery External Static Pressure (in.wg) Watts CFM Watts CFM Watts CFM Watts CFM Watts CFM Watts CFM Watts CFM Watts CFM Watts CFM Watts CFM Watts CFM Watts CFM Watts CFM Watts CFM Watts CFM Watts CFM Watts CFM *Air delivery values are based on operating voltage of 230 v or 460 v, wet coil, without filter or electric heater. Deduct filter and electric heater pressure drops to obtain static pressure available for ducting. NOTES: 1. Do not operate the unit at a cooling ariflow that is less than 350 cfm for each 12,000 Btuh of rated cooling capacity. Evaporator coil frosting may occur at airflows below this point. 2. Dashes indicate portions of table that are beyond the blower motor capacity or are not recommended. 460-v motors have 2 speeds (060 only). 17

18 Electrical data UNIT SIZE 50ZH NOMINAL V-PH-Hz IFM TYPE VOLTAGE RANGE COMPRESSO R OFM FLA IFM FLA HEATER PACKAGE NO. ELECTRIC HEAT Min Max RLA LRA Nominal kw* FLA MCA / Std / Std / Std / Std Std / Std / Std Std / Std / Std Std / Std / Std Std None CPHEATER026A00 CPHEATER024A00 None CPHEATER026A00 CPHEATER024A00 CPHEATER040A00 None CPHEATER026A00 CPHEATER024A00 CPHEATER040A00 None CPHEATER029A00 CPHEATER030A00 CPHEATER031A00 None CPHEATER034A00 CPHEATER035A00 CPHEATER036A00 None CPHEATER026A00 CPHEATER024A00 CPHEATER040A00 CPHEATER028A00 None CPHEATER029A00 CPHEATER030A00 CPHEATER031A00 CPHEATER041A00 None CPHEATER034A00 CPHEATER035A00 CPHEATER036A00 CPHEATER037A00 None CPHEATER038A00 CPHEATER024A00 CPHEATER040A00 CPHEATER028A00 None CPHEATER029A00 CPHEATER030A00 CPHEATER031A00 CPHEATER041A00 None CPHEATER034A00 CPHEATER035A00 CPHEATER036A00 CPHEATER037A00 None CPHEATER038A00 CPHEATER024A00 CPHEATER040A00 CPHEATER028A00 None CPHEATER029A00 CPHEATER030A00 CPHEATER031A00 CPHEATER041A00 None CPHEATER034A00 CPHEATER035A00 CPHEATER036A00 CPHEATER037A00 / 3.8/ /10.0 / 3.8/ / /15.0 / 3.8/ / /15.0 / 3.8/ / /15.0 / / 3.8/ / / /20.0 / 3.8/ / / /20.0 / / 3.8/ / / /20.0 / 3.8/ / / /20.0 / / 3.8/ / / /20.0 / 3.8/ / / /19.9 / / 18.3/ /41.7 / 18.3/ / /62.5 / 18.3/ / /62.5 / 10.5/ / /36.1 / / 18.3/ / / /83.3 / 10.5/ / / /48.1 / / 18.3/ / / /83.3 / 10.5/ / / /48.1 / / 18.3/ / / /83.3 / 10.5/ / / /47.9 / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / POWER SUPPLY MAX FUSE OR CKT. BKR. 25/25 25/50 30/30 45/50 35/35 50/60 20/20 35/35 45/50 60/ /40 60/60 25/25 35/35 50/50 60/ /50 30/30 40/40 50/ /60 35/35 45/45 60/ MOCP 70/80 70/80 90/110 80/80 100/110 /70 80/90 100/ /150 /70 80/80 70/70 90/ / /150 70/70 80/90 70/70 90/ / /150 70/80 90/90 LEGEND FLA Full Load Amps LRA Locked Rotor Amps MCA Minimum Circuit Amps MOCP Maximum Overcurrent Protection RLA Rated Load Amps *Heater capacity (KW) based on heater voltage of 208v, 240v, & 480v. If power distribution voltage to unit varies from rated heater voltage, heater KW will vary accordingly. NOTES: 1. In compliance with NEC (National Electrical Code) requirements for multimotor and combination load equipment (refer to NEC Articles 430 and 440), the overcurrent protective device for the unit shall be Power Supply fuse. The CGA (Canadian Gas Association) units may be fuse or circuit breaker. 2. Minimum wire size is based on 60 C copper wire. If other than 60 C wire is used, or if length exceeds wire length in table, determine size from NEC. 3. Unbalanced 3-Phase Supply Voltage Never operate a motor where a phase imbalance in supply voltage is greater than 2%. Use the following formula to determine the percentage of voltage imbalance. % Voltage imbalance max voltage deviation from average voltage = 100 x average voltage 18 EXAMPLE: Supply voltage is AB = 452 v BC = 464 v AC = 455 v Average Voltage = = 3 = 457 Determine maximum deviation from average voltage. (AB) =5v (BC) =7v (AC) =2v Maximum deviation is 7 v. Determine percent of voltage imbalance. 7 % Voltage Imbalance = 100 x 457 = 1.53% 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.

19 Typical wiring schematic 208/

20 Typical wiring schematic 208/

21 Typical wiring schematic

22 Typical wiring schematic (cont) C W1 W1 TO UNIT POWER WIRING BRN (COMMON) VIO (STEP 2) WHT ( STEP 1) BLK YEL CONTACTOR 2 BRN YEL YEL FUSE BLOCK L2 L1 F3 F4 F1 F2 YEL YEL BLK BLK CONTACTOR 1 BRN YEL YEL YEL YEL EL 1 EL 2 EL 3 AUTO-LIMIT BLK BLK BLK Electric Heater Wiring Sequence of operation Controls When power is supplied to unit, the transformer (TRAN) is energized. Cooling With the thermostat subbase in the cooling position, and when the space temperature comes within 2 F of the cooling set point, the thermostat makes circuit R-O. This energizes the reversing valve solenoid (RVS) and places the unit in standby condition for cooling. As the space temperature continues to rise, the second stage of the thermostat makes, closoing circuit R-Y. When compressor time delay (5 ± 2 minutes) is completed, a circuit is made to contactor (C), starting the compressor (COMP) and outdoor-fan motor (OFM). Circuit R-G is made at the same time, energizing the indoor-fan relay (IFR) and starting the indoor-fan motor (IFM) after a 1-second delay. When the thermostat is satisfied, contacts open, deenergizing C. The COMP and OFM stop, and the IFM stops after a 30 second time delay. Heating On a call for heat, thermostat makes circuits R-Y and R-G. When compressor time delay (5 ± 2 minutes) is completed, a circuit is made to C, starting COMP and OFM. Circuit R- G also is completed, energizing IFR and starting IFM after a 1-second delay. Should room temperature continue to fall, circuit R-W is made through second-stage thermostat bulb. If optional electric heat package is used, a relay is energized, bringing on first bank of supplemental electric heat. When thermostat is satisfied, contacts open, deenergizing contactor and relay; motors and heaters deenergize. The IFM may be controlled by a time-delay relay that keeps the fan on for 30 seconds. Defrost Defrost board (DB) is a time and temperature control, which includes a field-selectable time period between checks for defrost (30, 50, and 90 minutes). Electronic timer and defrost cycle start only when contactor is energized and defrost thermostat (DFT) is closed. Defrost mode is identical to cooling mode, except outdoorfan motor stops and a bank of optional electric heat turns on to warm air supplying the conditioned space. 22

23 Typical Installation INDOOR THERMOSTAT RETURN AIR TOP COVER FROM POWER SOURCE Power Wiring Control Wiring POWER AND LOW-VOLTAGE ENTRY COMPOSITE RUST-PROOF BASEPAN CONDENSATE DRAIN CONNECTION DISCONNECT PER NEC* (UNIT AND ELECTRIC HEATER) Condenser Airflow Evaporator Airflow *Separate disconnect per NEC (National Electrical Code) required for electric heater when singlepoint conection is not used. C

24 Guide specifications SMALL PACKAGE PRODUCT AIR-TO-AIR HEAT PUMP CONSTANT VOLUME APPLICATION HVAC GUIDE SPECIFICATIONS SIZE RANGE:2 TO 5 TONS, NOMINAL (COOLING) 21,800 TO 52,500 BTUH, NOMINAL (HEATING) MODEL NUMBER: 50ZH PART I - GENERAL 1.01 SYSTEM DESCRIPTION Outdoor package, electrically controlled, air-to-air heat pump utilizing a scroll compressor for heating and cooling duty. Unit shall discharge supply air horizontally as shown on contract drawings QUALITY ASSURANCE A. Unit shall be rated in accordance with ARI Standards 210/ , and Designed in accordance with UL Standard B. Unit shall be designed to conform to ASHRAE 15. C. Unit shall be UL listed as a total package for safety requirements. D. Insulation and adhesive shall meet NFPA 90A requirements for flame spread and smoke generation DELIVERY, STORAGE, AND HANDLING Unit shall be stored and handled per manufacturer's recommendations. PART 2- PRODUCTS 2.01 EQUIPMENT A. General: Factory-assembled, single piece, air-to-air heat pump. Contained within the unit enclosure shall be all factory wiring, piping, controls, and refrigerant charge (R-22). B. Unit Cabinet: 1. Unit cabinet shall be constructed of phosphated, bonderized, zinc-coated, prepainted steel. 2. Basepan shall be made of a single-piece non-corrosive, composite material. 3. Indoor fan compartment cabinet surfaces shall be insulated with a minimum 1/2 in. thick, flexible insulation, coated on the air side, with aluminum foil-faced insulation. 4. Cabinet panels shall be easily removable for servicing. 5. Unit shall have a factory-installed, sloped, noncorrosive, condensate drain. 6. Unit insulation conforms to ASHRAE 62P. C. Fans: 1. Indoor Blower (Indoor Fan): a. Fan shall be 2- or 3-speed, direct drive as shown on the equipment drawings. b. Fan wheel shall be made from steel, be double-inlet type. It shall have forward-curved blades with a corrosion-resistant finish and shall be dynamically balanced. 2. Outdoor fan shall be of the direct-driven propeller type with aluminum blades, riveted to corrosion-resistant steel spiders. It shall be dynamically balanced, and shall discharge air upwards. D. Compressor: Fully hermetic scroll, type with internal and external vibration isolation. E. Coils: 1. Indoor and outdoor coils shall have aluminum-plate fins mechanically bonded to seamless copper tubes with all joints brazed. 2. Tube sheet openings shall be bellied to prevent tube wear. 3. Outdoor coil shall be protected by metal louvered panels. F. Refrigerant Components: 1. Fixed orifice feed system. 2. Service gage connections on suction, discharge and liquid lines. 3. Equipped with liquid line strainers. 4. Equipped with liquid line loss of charge switch. G. Controls and Safeties: 1. Unit Controls: a. Unit shall be complete with self-contained lowvoltage control circuit. b. Defrost board is equipped with 5 minute compressor time delay protection. c. Unit shall incorporate an outdoor-coil defrost system to prevent excessive frost accumulation during heating duty, and shall be controlled as follows: 1) Defrost shall be initiated on the basis of time and coil temperature. 2) A 30/50/90 minute timer shall activate defrost cycle only if coil temperature is low enough to indicate a heavy frost condition. 3) Defrost cycle shall terminate when defrost thermostat is satisfied or shall have a positive termination time of 10 minutes. 2. Safeties: Compressor, overtemperature, overcurrent. H. Operating Characteristics: 1. Unit shall be capable of starting and running at 115F ambient outdoor temperature per maximum load criteria of ARI Standard Compressor with standard controls shall be capable of operation down to 40 F ambient outdoor temperature in cooling duty. 3. Compressor shall be capable of operation in heating duty down to 20 F ambient outdoor-air temperature. 4. Unit shall be capable of simultaneous heating duty and defrost cycle operation when using electric heaters indicated in Section K, Special Features. 5. Compressors will be prevented from restarting for a minimum of 5 minutes after shutdown. I. Electrical Requirements: All unit power wiring shall enter unit cabinet at a single location. J. Motors: 1. Compressor motors shall be of the refrigerant-cooled type with line break thermal and current overload protection. 24