50GL Single-Packaged Electric Cooling 50Hz, CE Units with Puron (R-410A) Refrigerant Features/Benefits

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1 Product Data 50GL Single-Packaged Electric Cooling 50Hz, CE Units with Puron (R-410A) Refrigerant 7 to 14 kw (2 to 4 Nominal Tons) UNIT 50GL (50HZ) Single-Packaged Products with Energy-Saving Features and Puron refrigerant. Designed in accordance with European Community (CE) Standards. Low Sound Levels EER up to 9.5 Features/Benefits One-piece cooling unit with optional electric heater, low installation cost, dependable performance and easy maintenance. Efficient operation High-efficiency design with EER s (Energy Efficiency Ratio) of up to 9.5 Puron Environmentally Sound Refrigerant is Carrier s unique refrigerant designed to help protect the environment. Puron is an HFC refrigerant which does not contain chlorine that can harm the ozone layer. The most important advantage of Puron refrigerant is that it has not been banned in future air conditioning systems as the traditional refrigerant R-22 has been. Puron refrigerant is in service in thousands of systems proving highly reliable, environmentally sound performance. Easy Installation Factory-assembled package is a compact, fully self-contained, electric cooling unit that is pre-wired, prepiped, and pre-charged for minimum installation expense. 50GL units are available in a variety of standard cooling sizes. Units are lightweight, and install easily on a rooftop or at ground-level. The hightech, composite base eliminates rust problems associated with ground level applications. Durable, dependable components Scroll Compressors are designed for high efficiency. Each compressor is Copyright 2002 Carrier Corporation Form 50GL-C2PD

2 hermetically sealed against contamination to help promote longer life and dependable operation. Vibration isolation provides quiet operation. Compressors have internal high-pressure and overcurrent protection. Convertible duct configuration Unit is designed for easy use in either downflow or horizontal applications. Each unit is easily converted from horizontal to downflow. Direct-drive multi-speed, blower motor is standard on all 50GL models. Direct-drive condenser-fan motors are designed to help reduce energy consumption and provide for cooling operation down to 55 F (12.7 C) outdoor temperature. Motormaster II low ambient kit is available as a fieldinstalled accessory. Corporate thermostats designed to work as a system with Carrier s small packaged product. Refrigerant system is designed to provide dependability. Liquid refrigerant filter driers are used to promote clean, unrestricted operation. Each unit leaves the factory with a full Puron refrigerant charge. Refrigerant service connections are standard on the suction and discharge lines for checking operating pressures. Evaporator and condenser coils are computer-designed for optimum heat transfer and cooling efficiency. The evaporator coil is fabricated from copper tube and aluminum fins and is located inside the unit for protection against damage. The condenser coil is internally mounted on the top tier of the unit. Copper fin coils and pre-coated fin coils are available from the factory by special order. These coils are recommended in applications where aluminum fins are likely to be damaged due to corrosion. They are ideal for seacoast applications. High and Low Pressure Switches give added safety and reliability to the compressor. Low sound ratings ensure a quiet indoor and outdoor environment with sound ratings as low as 75 db. (See page 3.) Easy to service cabinets provide easy single-panel accessibility to serviceable components during maintenance and installation. The base with an integrated drain provides easy ground level installation with or without a mounting pad. Convenient riggingholds are provided to manipulate the unit on the jobsite. A nesting feature ensures a positive base to roof curb seal when the unit is roof mounted. A convenient 3/4-in. (19.05 mm) wide perimeter flange makes frame mounting on a rooftop easy. Louvered Grille provides hail and vandalism protection for the coil. Downflow operation is easily provided in the field to allow vertical ductwork connections. The base utilizes knockout style seals on the bottom openings to ensure a positive seal in the horizontal airflow mode. Cabinets are constructed of heavyduty, phosphated, zinc-coated prepainted steel capable of withstanding 500 hours of salt spray. Interior surfaces of the evaporator and electric heater compartments are insulated with cleanable semi-rigid insulation board, which keeps the conditioned air from being affected by the outdoor ambient temperature and provides improved indoor air quality. (Conforms to American Society of Heating, Refrigeration and Air Conditioning Engineers No. 62P.) The sloped drain minimizes standing water. Standard metal duct covers with insulation come with the unit and cover the horizontal duct openings. These can be left in place if the unit is converted to downflow. Table of contents Page Features/Benefits ,2 Model Number Nomenclature ARI Capacities Physical Data Options and Accessories ,6 Base Unit Dimensions ,8 Accessory Dimensions Selection Procedure Performance Data Wet Coil Air Delivery Typical Piping and Wiring Application Data Electrical Data Typical Wiring Schematics Controls Guide Specifications , 24 2

3 Model number nomenclature 50GL BT Options Model Number 50GL Single Packaged-Electric Cooling BT AL evap, vinyl condens CC AL evap, CU condens CU CU evap & condens Only used if ordering an option Nominal Cooling Capacity kw kw kw kw Series Packaging 3-Export V-Ph-Hz AL Aluminum CU Copper Capacities and efficiencies UNIT 50GL NOMINAL CAPACITY (kw) COOLING CAPACITIES AND EFFICIENCIES STANDARD CFM/L/s NET COOLING CAPACITIES (Btuh) EER SOUND RATINGS (db) /378 24, /472 29, /567 35, /756 48, LEGEND kw Kilowatt db Sound Levels (decibels) db Dry Bulb EER Energy Efficiency Ratio wb Wet Bulb * Air Conditioning & Refrigeration Institute. NOTES: 1. Ratings are net values, reflecting the effects of circulating fan heat. Ratings are based on: Cooling Standard: 80 F (26.7 C) db, 67 F (19.4 C) wb indoor entering-air temperature and 95 F (35 C) db outdoor entering-air temperature. 2. Before purchasing this appliance, read important energy cost and efficiency information available from your retailer. 3

4 Physical data 50GL 50 Hz 4 UNIT OUTDOOR SOUND: OCTAVE BAND DATADECIBELS Frequency (Hz) English UNIT SIZE NOMINAL CAPACITY (ton) 2 2-1/2 3 4 OPERATING WEIGHT (lb) COMPRESSOR SCROLL REFRIGERANT (R-410A) Quantity (lb) PISTON REFRIGERANT METERING DEVICE CONDENSER COIL RowsFins/in. Face Area (sq ft) CONDENSER FAN Nominal Cfm Diameter (in.) Motor Hp (Rpm) EVAPORATOR COIL RowsFins/in. Face Area (sq ft) EVAPORATOR BLOWER Nominal Airflow (Cfm) Size (in.) Motor (Hp) (RPM) / x 10 1/ *Required filter sizes shown are based on the larger of the ARI (Air Conditioning & Refrigeration Institute) rated cooling airflow or the heating airflow velocity of 300 ft/min for throwaway type or 450 ft/min for high-capacity type. Air filter pressure drop for non-standard filters must not exceed 0.08 in. wg. * Required filter sizes shown are rated cooling airflow or heating airflow velocity of 91.5 m./min. for throwaway type or 137 m./min. for highcapacity type. Air filter pressure drop for non-standard filters must not exceed 2.03 mm. wg. SI / x 10 1/ GL / x 10 1/ / x RETURN-AIR FILTERS (in.)* Throwaway 20 x x x x 30 UNIT SIZE NOMINAL CAPACITY (kw) OPERATING WEIGHT (Kg) COMPRESSOR SCROLL REFRIGERANT (R-410A) Quantity (kg) PISTON REFRIGERANT METERING DEVICE CONDENSER COIL RowsFins/m Face Area (sq. m) CONDENSER FAN Nominal L/s Diameter (mm) Motor WATTS (r/s) EVAPORATOR COIL RowsFins/m. Face Area (sq. m) EVAPORATOR BLOWER Nominal Airflow (L/s) Size (m) Motor WATTS (r/s) x x x x RETURN-AIR FILTERS (mm.)* Throwaway 508 x x x x 762

5 Options and accessories Factory-installed options Coil options include copper/copper and vinyl-coated construction for refrigerant coils. Units are shipped standard with copper tube/aluminum fin construction. See model number nomenclature for coil options. Field-installed accessories Economizer with Solid-State Controls and Barometric Relief Dampers Manual Air Damper (25% open) Electric Heaters Filter Rack Flat Roof Curbs (8 in/203.2 mm and 14 in/355.6 mm) Square-to-Round Duct Transition Kit Thermostats Crankcase Heater Low Ambient Kit (Motormaster II Control) Lifting Kit Compressor Hard Start Kit Economizer with solid-state controls and barometric relief dampers includes filter racks and provide outdoor air during cooling and reduce compressor operation. Manual outside air damper includes hood and filter rack with adjustable damper blade for up to 25% outdoor air. Electric heaters provide heat in the unit when required. Each package has a heater module that slides into the controls compartment. Heater sizes range from 6.5 to 17.4 kw. The electric heater design allows the use of a single-point power supply for the entire unit, resulting in lower installed costs. Flat roof curbs in both 8 in (203.2 mm) and 14 in. (355.6 mm) sizes are available for roof mounted applications. Square-to-round duct transition kit enables size units to be fitted to 14 in. (355.6 mm) round ductwork. Thermostats provide control for the system heating and cooling functions. Thermostat models are available in both programmable and non-programmable versions. Lifting kit, including 4 metal brackets that fit into the rigging-holds, a support strap and two safety straps, is available to assist in lifting this product onto a roof application. Crankcase heater provides anti-floodback protection for low-load cooling applications. Low-ambient kit (Motormaster II control) allows the use of mechanical cooling down to outdoor temperatures as low as 0 F ( 17.8 C). Filter rack features easy installation, serviceability, and high-filtering performance for vertical applications. ODS CATALOG ORDERING NO. NOMINAL CAPACITY (kw) ELECTRIC HEATERS LEGEND ODS Order Distribution System NOTE: Electric heaters are rated at 400 v. Refer to Multiplication Factors table for other voltages. FLA USED WITH SIZES CPHEATER0076A X X X X CPHEATER0077A X X X X CPHEATER0078A X X X CPHEATER0079A X MINIMUM AIRFLOW FOR RELIABLE ELECTRIC HEATER OPERATION UNIT CFM L/s

6 ECONOMIZER FILTER ACCESS DOOR (HORIZONTAL APPLICATION ONLY.) DO NOT REMOVE FROM DOWNFLOW DISCHARGE. REPLACEMENT PANEL HOLE FOR ECONOMIZER WIRING HARDNESS DOOR LATCH ANGLE HINGED FILTER ACCESS DOOR 17 13/32 (442mm) 11 13/32 (290mm) INSTALL FILTER ACCESS DOOR STICKER 16 1/4 (413mm) RAINHOOD ALUMINUM FILTER FILTER RACK MANUAL OUTSIDE AIR DAMPER REPLACEMENT PANEL MANUAL OUTSIDE AIR HOOD DAMPER BLADE 6

7 Base unit dimensions50gl (50HZ) UNIT ELECTRICAL UNIT WEIGHT UNIT HEIGHT CENTER OF GRAVITY in. [mm] in. [mm] CHARACTERISTICS lb kg A X Y Z 50GL [940.3] 18.5 [469.9] 14.5 [368.3] 16.0 [406.4] 50GL [991.1] 19.5 [495.3] 15.5 [393.7] 17.6 [447.0] 50GL [889.5] 19.5 [495.3] 15.3 [387.4] 16.5 [419.1] 50GL Dimensions 7

8 Base unit dimensions50gl048 (50HZ) ELECTRICAL UNIT WEIGHT UNIT HEIGHT CENTER OF GRAVITY UNIT in. [mm] in. [mm] CHARACTERISTICS lb kg A X Y Z 50GL [990.2] 19.5 [495.3] 17.6 [447.6] 18.0 [457.2] 50GL 048 Dimensions 8

9 Accessory dimensions UNIT SIZE 50GL GL048 ODS ORDER NO. A in. [mm] B in. [mm] C in. [mm] D in. [mm] CPRFCURB006A00 8 [203] 11 [279] 16-1/2 [419] 28-3/4 [730] CPRFCURB007A00 14 [356] 11 [279] 16-1/2 [419] 28-3/4 [730] CPRFCURB008A00 8 [203] 16-3/16 [411] 17-3/8 [441] 40-1/4 [1022] CPRFCURB009A00 14 [356] 16-3/16 [411] 17-3/8 [441] 40-1/4 [1022] NOTES: 1. Roof curb must be set up for unit being installed. 2. Seal strip must be applied as required to unit being installed. 3. Dimensions in [ ] are in millimeters. 4. Roof curb is made of 16 gage steel. 5. Attach ductwork to curb (flanges of duct rest on curb). 6. Insulated panels: 1-in. (25.4 mm) thick fiberglass 1 lb (.45 kg) density. 7. Dimensions are in inches. 8. When unit mounting screw is used (see Note A), a retainer bracket must be used as well. This bracket must also be used when required by code for hurricane or seismic conditions. This bracket is available through Micrometl. Screw (NOTE A) HVAC unit base Gasketing inner flange* Screw (NOTE A) HVAC unit base Gasketing inner flange* *Gasketing outer flange *Gasketing outer flange Flashing field supplied Wood nailer* Roofcurb* Flashing field supplied Wood nailer* Roofcurb* Roofing material field supplied Insulation (field supplied) Roofing material field supplied Insulation (field supplied) Cant strip field supplied Duct work field supplied Cant strip field supplied Duct work field supplied Roof Roof *Provided with roofcurb *Provided with roofcurb Roof Curb for Small Cabinet Note A: When unit mounting screw is used, retainer bracket must also be used. Roof Curb for Large Cabinet Note A: When unit mounting screw is used, retainer bracket must also be used. Supply opening (B x C) 44 5/16" (1125.5mm) B Typ. D C Typ. R/A S/A A Gasket around duct Insulated deck pan Long Support Short Support Insulated deck pan Gasket around outer edge Return opening (B X C) C

10 50GL Corner weights 1 2 y 4 3 x KG (lb) Small Base Large Base Model 50GL Corner Weight #1 76 (34.5) 84 (38.1) 85 (38.6) 78 (35.4) Corner Weight #2 49 (22.2) 60 (27.2) 60 (27.2) 56 (25.4) Corner Weight #3 57 (25.9) 61 (27.7) 64 (29.0) 80 (36.3) Corner Weight #4 82 (37.2) 91 (41.3) 93 (42.2) 138 (62.6) Total Weight 264 (119.7) 296 (134.3) 302 (137.0) 350 (158.8) Selection Procedure I Determine cooling and heating requirements at design conditions: Given: Required Cooling Capacity (TC) kw (35,500 Btuh) Sensible Heat Capacity (SHC) kw (25,000 Btuh) Required Heating Capacity kw (22,000 Btuh) Condenser Entering Air Temperature C (95 F) Indoor-Air Temperature C (80 F) edb, 19 C (67 F) ewb Evaporator Air Quantity L/s (1150 cfm) External Static Pressure Pa (0.1 in. wg) Electrical Characteristics II Select unit based on required cooling capacity. A. SI- Enter Net Cooling Capacities SI table at condenser entering temperature of 35 C, which matches design Condenser Entering Air Temperature. Unit 50GL036-50Hz. At 566 L/s and 19 C Entering Wet Bulb will provide a total capacity of 12.5 kw and a SHC of 9.1 kw. Calculate SHC correction, if required, using Note 3 on page 15. B. English- Enter Net Cooling Capacities SI table at condenser entering temperature of 95 F. Unit 50GL Hz. At 1200 CFM and 67 F Entering Wet Bulb will provide a total capacity of 36,700 BTUH and a SHC of 26,600 BTUH. Calculate SHC correction, if required, using Note 3 on page 15. III Select electric heat. The required heating capacity is 6.4 kw (22,000 Btuh) (given). Determine the electric heat capacity in kw. 22,000 Btuh ( = 6.44 kw of heat required 3414 Btuh/kW ) Enter the Electric Heater table for the unit. The 6.5 kw heater at 400v most closely satisfies the heating required. 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, Filter Pressure Drop table, find: External static pressure 12.5 Pa (0.05 in. wg) Filter Pa (.12 in. wg) Total static pressure 42.4 Pa (0.17 in. wg) Enter the table for Wet Coil Air Delivery Horizontal Discharge, 400 V. At 424 Pa (O.17 in. wg) external static pressure and low speed, the motor delivers 561 L/s (1188 cfm). 10

11 Performance data 50GL024 COOLING PERFORMANCE TABLE- English Temp (F) Outdoor Air Entering Condenser NET COOLING CAPACITIES Evaporator AirCfmBF 700/ / /0.051 Evaporator Air Ewb (F) TC SHC kw TC SHC kw TC SHC kw TC SHC kw TC SHC kw TC SHC kw GL024 COOLING PERFORMANCE TABLE- SI Temp (C) Outdoor Air Entering Condenser See Legend and Notes on page 15. NET COOLING CAPACITIES Evaporator AirL/sBF 330/ / /0.51 Evaporator Air Ewb (C) TC SHC kw TC SHC kw TC SHC kw TC SHC kw TC SHC kw TC SHC kw

12 Performance data (cont) 50GL030 COOLING PERFORMANCE TABLE- English Temp (F) Outdoor Air Entering Condenser NET COOLING CAPACITIES Evaporator AirCfmBF 875/ / /0.074 Evaporator Air Ewb (F) TC SHC kw TC SHC kw TC SHC kw TC SHC kw TC SHC kw TC SHC kw GL030 COOLING PERFORMANCE TABLE- SI Temp (C) Outdoor Air Entering Condenser See Legend and Notes on page 15. Evaporator AirL/sBF 413/ / /0.074 Evaporator Air Ewb (C) TC SHC kw TC SHC kw TC SHC kw TC SHC kw TC SHC kw TC SHC kw

13 Performance data (cont) 50GL036 COOLING PERFORMANCE TABLE- English Temp (F) Outdoor Air Entering Condenser NET COOLING CAPACITIES Evaporator AirCfmBF 1050/ / /0.11 Evaporator Air Ewb (F) TC SHC kw TC SHC kw TC SHC kw TC SHC kw TC SHC kw TC SHC kw GL036 COOLING PERFORMANCE TABLE- SI Temp (F) Outdoor Air Entering Condenser See Legend and Notes on page 15. Evaporator AirL/sBF 496/ / /0.11 Evaporator Air Ewb (C) TC SHC kw TC SHC kw TC SHC kw TC SHC kw TC SHC kw TC SHC kw

14 Performance data (cont) 50GL048 COOLING PERFORMANCE TABLE- English Temp (F) Outdoor Air Entering Condenser NET COOLING CAPACITIES Evaporator AirCfmBF 1400/ / /0.038 Evaporator Air Ewb (F) TC SHC kw TC SHC kw TC SHC kw TC SHC kw TC SHC kw TC SHC kw GL048 COOLING PERFORMANCE TABLE- SI Temp (C) Outdoor Air Entering Condenser See Legend and Notes on page 15. Evaporator AirL/sBF 661/ / /0.038 Evaporator Air Ewb (C) TC SHC kw TC SHC kw TC SHC kw TC SHC kw TC SHC kw TC SHC kw

15 LEGEND EWB Entering Wet-Bulb kwtotal Unit Power Input SHCSensible Heat Capacity (1000 Btuh, or kw) TCTotal Capacity (1000 Btuh or kw) BFBy Pass Factor NOTES: 1. Ratings are net; they account for the effects of the evaporator-fan motor power and heat. 2. Direct interpolation is permissible. Do not extrapolate. 3. The following formulas may be used: sensible capacity (Btuh) t = t ldb edb 1.10 x cfm t lwb = Wet-bulb temperature corresponding to enthalpy of air leaving evaporator coil (h lwb) total capacity (Btuh) h lwb = hewb 4.5 x cfm Where: h = Enthalpy of air entering evaporator coil ewb 4. The SHC is based on 80 F Edb (Entering dry bulb) air temperature through Evaporator coil. Below 80 F Edb, subtract (Correction Factor x CFM) from SHC. Above 80 F Edb, add (Correction Factor x CFM) to SHC. Correction Factor = 1.10 x (1 BF) x (Edb 80) 15

16 Performance data (cont) ECONOMIZER 1-in. (25.4 mm) FILTER PRESSURE DROP UNIT50GL in. wg. Pa ELECTRIC HEATER MULTIPLICATION FACTORS HEATING kw RATING 400 VOLTAGE DISTRIBUTION V, 3 Ph MULTIPLICATION FACTOR Example: 12.1 kw (at 400 v) heater on 380 v = 12.1 (.90 multiplication factor) = 10.9 kw capacity at 380 v NOTE: Heater kw rating is voltage as marked on the base unit nameplate. Voltage distribution is the design power supply at installation site. FILTER PRESSURE DROP TABLE (In. wg) ENGLISH FILTER SIZE CFM X 20 X 1 (508 X 508 X 25.4) X 24 X 1 (508 X 610 X 25.4) X 30 X 1 (610 X 762 X 25.4) Note: Dimensions in ( ) are in mm. FILTER PRESSURE DROP (Pa) SI FILTER L/s SIZE (mm) x x x ACCESSORY ELECTRIC HEAT PRESSURE DROP (Pa) SI HEATER L/s kw NOTE: Direct interpolation is permissible. Do not extrapolate. ACCESSORY ELECTRIC HEAT PRESSURE DROP (in. wg) ENGLISH HEATER CFM kw NOTE: Direct interpolation is permissible. Do not extrapolate. 16

17 Unit 50GL024 50GL030 50GL036 50GL048 WET COIL AIR DELIVERYHORIZONTAL AND DOWNFLOW DISCHARGE UNIT 50GL (50 Hz.) Motor Speed Low High Low High Low High Low High External Static Pressure (in.wg) Watts Cfm Watts Cfm Watts Cfm Watts Cfm Watts Cfm Watts Cfm Cfm Watts Cfm * Air delivery values are based on operating voltage of 400v, 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 airflow that is less than 350 CFM for each 12,000 BTUH (165 L/s for each 3.5 kw) 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. Unit 50GL024 50GL030 50GL036 50GL048 Motor Speed Low High Low High Low High Low High External Static Pressure (Pa.) Watts L/s Watts L/s Watts L/s Watts L/s Watts L/s Watts L/s Watts L/s Watts L/s * Air delivery values are based on operating voltage of 400v, 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 airflow that is less than 165 L/s for each 3.5 kw 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. 17

18 Typical piping and wiring ROOF-MOUNTING CURB ROOF RETURN-AIR FLEXIBLE DUCT SUPPLY-AIR FLEXIBLE DUCT CONCENTRIC DIFFUSER BOX (FIELD-SUPPLIED) CEILING C00023 INDOOR THERMOSTAT RETURN AIR TOP COVER FROM POWER SOURCE DISCONNECT PER IEC* C

19 Application data Condensate trap A 2-in. (50.8 mm) condensate trap must be field supplied. 1 MIN. TRAP OUTLET 2 MIN. Ductwork Secure downflow discharge ductwork to roof curb. For horizontal discharge applications, attach ductwork to unit with flanges. To convert a unit to downflow discharge Units are equipped with factory-installed inserts in the downflow openings. Remove the inserts similar to removing an electrical knock-out. Leave on duct covers to seal the horizontal discharge openings in the unit. Units installed in horizontal discharge orientation do not require duct covers. Maximum cooling airflow To minimize the possibility of condensate blow-off from the evaporator, airflow through the units should not exceed 450 cfm/ton (212 L/s per 3.5 kw of cooling capacity). Minimum cooling airflow The minimum cooling airflow is 350 cfm/ton (165 L/s per 3.5 kw of cooling capacity). Minimum cooling ambient operating temperature All standard units have a minimum ambient operating temperature of 55 F/12.8 C. With accessory low ambient temperature kit, units can operate at temperatures down to 0 F ( 17.8 C). Maximum operating outdoor air temperature Maximum outdoor operating air temperature for cooling is 125 F (51.7 C). 19

20 Electrical data 50GL (50hz) UNIT SIZE 50GL V-PH-Hz VOLTAGE RANGE COMPRESSOR Min Max RLA LRA OFM FLA * Electric heat capacity (kw) is based on heater voltage of 400-v. If power distribution voltage to unit varies from rated heater voltage, heater kw also varies. See Electric Heater Multiplication Factor table. (See legend following Electrical Data charts) IFM FLA 50GL-024-E GL-030-E GL-036-E GL-048-E ELECTRIC HEAT Nominal kw* FLA MCA POWER SUPPLY DISCONNECT SIZE FUSE OR CKT BKR MOCP FLA LRA LEGEND FLA Full Load Amps LRA Locked Rotor Amps MCA Minimum Circuit Amps MOCP Maximum Overcurrent Protection RLA Rated Load Amps CKTBKR Circuit Breaker NOTES: 1. In compliance with IEC(International Electrical Code) requirements for multimotor and combination load equipment (refer to IEC Articles 430 and 440), the overcurrent protective device for the unit shall be Power Supply fuse.. 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 IEC. 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 = 100 x max voltage deviation from average voltage average voltage EXAMPLE: Supply voltage is AB = 393 v BC = 403 v AC = 396 v Average Voltage = = 3 = 397 Determine maximum deviation from average voltage. (AB) = 4 v (BC) = 6 v (AC) = 1 v Maximum deviation is 6 v. Determine percent of voltage imbalance. 6 % Voltage Imbalance = 100 x 397 = 1.5% 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. 20

21 Typical wiring schematic shown 21

22 Controls Operating sequence Cooling When the system thermostat calls for cooling, 24-v. is supplied to the Y and G terminals of the thermostat. The Y thermostat closure sends 24-v. to the 24-v. terminal of the Phase Rotation Monitor (PRM). The PRM monitors the incoming high voltage phase angles to prevent incorrect compressor rotation from occurring. If the phases as sensed by the PRM are correct, a set of internal PRM contacts close sending 24-v. out the PRM CTR terminal energizing the compressor contactor. The G thermostat output energizes the indoor (evaporator) fan time delay relay (IFR). The normally open contacts of the compressor contactor (C) close energizing the compressor (COMP), outdoor fan motor (ODF) and indoor fan motor (IFM). All motors start instantly. On the loss of thermostat call for cooling, 24-v. is removed from both the Y and G terminals (provided the fan switch is in the AUTO position) deenergizing the compressor contactor and opening the contacts supplying power to the compressor, outdoor fan and indoor fan. If the thermostat fan selector switch is in the ON position, the IFM will run continuously. NOTE: On units with a Time Guard II device: once the compressor has started and then stopped, it cannot be restarted again until 5 minutes have elapsed. Heating If accessory electric heaters are installed, on a call for heat, circuit R-W is made through the thermostat contacts. Circuit R-G is made which energizes the IFR. If the heaters are staged, then the thermostat closes a second set of contacts (W2) when second stage is required. When thermostat is satisfied, contacts open, deenergizing the heater relay and the IFR. 22

23 Guide specifications Packaged Electric Cooling Units Constant Volume Application HVAC Guide Specifications Size Range: 7 to 14 kw (2 to 4 Tons), Nominal Cooling Carrier Model Number: 50GL (50HZ, CE) Part 1General SYSTEM DESCRIPTION Outdoor rooftop or ground mounted, electric cooling unit utilizing a hermetic compressor for cooling duty and optional electric heating. Unit shall discharge supply air vertically or horizontally as shown on contract drawings. Condenser fan/coil section shall have a draw-thru design with vertical discharge for minimum sound levels. QUALITY ASSURANCE A. Unit shall be designed in accordance with UL Standard B. Unit shall be manufactured in a facility registered to ISO 9001 manufacturing quality standard. C. Unit shall be designed in accordance with UL and c-ul as a total package for safety requirements. D. Roof curb shall be designed to conform to NRCA Standards. E. Insulation and adhesives shall meet NFPA 90A requirements for flame spread and smoke generation. F. Cabinet insulation shall meet ASHRAE Standard 62P. DELIVERY, STORAGE AND HANDLING Unit shall be stored and handled per manufacturer s recommendations. Part 2 Products EQUIPMENT A. General: Factory-assembled, single-piece, cooling unit. Contained within the enclosure shall be all factory wiring, piping, controls, refrigerant charge (R-410A), and special features required prior to field start-up. B. Unit Cabinet: 1. Unit cabinet shall be constructed of phosphated, zinc-coated, pre-painted steel capable of withstanding 500 hours of salt spray. 2. Normal service shall be through a single removable cabinet panel. 3. The unit shall be constructed on a rust proof base that has an externally trapped, integrated sloped drain. 4. Evaporator fan compartment top surface shall be insulated with a minimum 1/2-in. (12.7 mm) thick, flexible fiberglass insulation, coated on the air side and retained by adhesive and mechanical means. The evaporator wall sections will be insulated with a minimum semi-rigid foil-faced board capable of being wiped clean. Aluminum foil-faced fiberglass insulation shall be used in the entire indoor air cavity section. 5. Unit shall have a field-supplied condensate trap. C. Fans: 1. The evaporator fan shall be 2-speed, direct-drive, as shown on equipment drawings, or factory installed variable speed motor and control. 2. Fan wheel shall be made from steel, and shall be double-inlet type with forward curved blades with corrosion resistant finish. Fan wheel shall be dynamically balanced. 3. Condenser fan shall be direct drive propeller type with aluminum blades riveted to corrosion resistant steel spiders, be dynamically balanced, and discharge air vertically. D. Compressor: 1. Fully hermetic compressors with factory-installed vibration isolation. 2. Scroll compressors shall be standard on all units. E. Coils: Evaporator and condenser coils shall have aluminum plate fins mechanically bonded to seamless copper tubes with all joints brazed. (Copper/copper and vinylcoated construction available as option.) Tube sheet openings shall be belled to prevent tube wear. F. Refrigerant Metering Device: Refrigerant metering device shall be of the single body fixed orifice feed type. G. Filters: Filter section shall consist of field-installed, throwaway, 1-in. (25.4 mm) thick fiberglass filters of commercially available sizes. H. Controls and Safeties: 1. Unit controls shall be complete with a self-contained low voltage control circuit. 2. Units shall incorporate phase protection monitor that provides protection against compressor reverse rotation. 3. Unit shall provide High and Low/Loss-of-Charge Pressure Safety Protection. I. Operating Characteristics: 1. Unit shall be capable of starting and running at 115 F/51.7 C ambient outdoor temperature, exceeding maximum load criteria of the CE requirement. 2. Compressor with standard controls shall be capable of operation down to 55 F (12.8 C) ambient outdoor temperature. J. Electrical Requirements: All unit power wiring shall enter the unit cabinet at a single location. K. Motors: 1. Compressor motors shall be of the refrigerantcooled type with line-break thermal and current overload protection. 2. All fan motors shall have permanently lubricated bearings, and inherent, automatic reset, thermal overload protection. 3. Condenser fan motor shall be totally enclosed. 23

24 Guide specifications (cont) L. Grille 1. Louvered Grille: Louvered grille shall be standard on all units. M. Special Features Available 1. Coil Options: Shall include factory-installed optional copper/ copper and vinyl-coated refrigerant coils. 2. Economizer: a. Economizer controls capable of providing free cooling using outside air. b. Equipped with low leakage dampers not to exceed 3% leakage, at 1.0 in. wg pressure differential. c. Spring return motor shuts off outdoor damper on power failure. 3. Flat Roof Curb: Curbs shall have seal strip and a wood nailer for flashing and shall be installed per manufacturer s instructions. 4. Manual Outdoor Air Damper: Package shall consist of damper, birdscreen, and rainhood which can be preset to admit outdoor air for year-round ventilation. 5. Thermostat: To provide for one-stage heating and cooling in addition manual or automatic changeover and indoor fan control. 6. Low Ambient Package: Shall consist of a solid-state control and condenser coil temperature sensor for controlling condenserfan motor operation, which shall allow unit to operate down to 0 F ( 17.8 C) outdoor ambient temperature. 7. Filter Rack Kit: Shall provide filter mounting for downflow applications. 8. Square-To-Round Duct Transitions: Shall have the ability to convert the supply and return openings from rectangular to round. ( ) 9. Crankcase Heater: Shall provide anti-floodback protection for lowload cooling applications. 10. Electric heaters: a. Electric heater shall be available as a fieldinstalled option. b. Heater elements shall be open wire type, adequately supported and insulated with ceramic bushings. c. Electric heater packages must provide single point power connection capability. Carrier Corporation Indianapolis, IN Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Book 1 4 New Book 1 Page 24 Catalog No Printed in U.S.A. PC 101 Form 50GL-C2PD Tab 1b 1a Tab OP2a Replaces: 50GL-C1PD

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