Carrier 50LJQ008 manual

Installation, Start-Up and Service Instructions CONTENTS Page SAFETY CONSIDERA TIONS .................. 1 INST ALLA TION ............................ 1-16 Step 1 — Provide Unit Support .............. 1 • ROOF CURB • SLAB MOUNT Step 2 — Field Fabricate Ductwork ........... 1 Step 3 — Make Field Connection for Condensate Disposal ..........[...]

ROOF CURB ACCESSOR Y ‘ ‘A ’ ’ UNIT SIZE 50DJ901371 1 8 -2 9 50LJQ008,012 [356] 50DJ901381 2 8 -0 9 [610] UNIT SIZE ‘ ‘F’ ’ POWER ‘ ‘G’ ’ CONTROL CONNECTOR PKG. ACC. 50LJQ008,012 1 9 [25] NPT or 2 9 [51] NPT 3 ⁄ 4 9 [19] NPT 50DJ90131 1 NOTES: 1. Roof curb accessory is shipped unassembled. 2. Insulated panels: 25 mm (one in[...]

Step 3 — Make Field Connection for Conden- sate Disposal — Units must have an external trap added. See Fig. 3. A 3 ⁄ 4 -in. FPT connection is located on the side of the unit. Use a trap at least 100 mm (4 in.) deep, and protect against freeze-up. If drain line is run to a drain, pitch line away from unit at 25 mm (one in.) per 3 m (10 ft) of [...]

T able 1A — Physical Data (SI) BASE UNIT 50LJQ 008 012 NOMINAL CAP ACITY (kW) 23.2 28.8 OPERA TING WEIGHT (kg) Unit 381 426 With Economizer 401 446 Roof Curb 101 101 COMPRESSOR Hermetic Quantity 22 Oil (ml) (each compressor) 1627 2071 REFRIGERANT TYPE R-22 Operating Charge (kg) Circuit 1 3.7 4.0 Circuit 2 3.2 3.9 OUTDOOR F AN Propeller Quantity .[...]

T able 1B — Physical Data (English) BASE UNIT 50QJ 008 012 NOMINAL CAP ACITY (tons) 6.6 8.2 OPERA TING WEIGHT (lb) Unit 840 940 With Economizer 884 984 Roof Curb 223 223 COMPRESSOR Hermetic Quantity 22 Oil (fluid oz) (each compressor) 55 70 REFRIGERANT TYPE R-22 Operating Charge (lb-oz) Circuit 1 8-2 8-14 Circuit 2 7-0 8-10 OUTDOOR F AN Propelle[...]

UNIT 50LJQ STD. UNIT WEIGHT ECONOMIZER WEIGHT CORNER WEIGHT ‘ ‘A ’ ’ CORNER WEIGHT ‘ ‘B’ ’ CORNER WEIGHT ‘ ‘C’ ’ CORNER WEIGHT ‘ ‘D’ ’ ‘ ‘H’ ’ ‘‘J’ ’ ‘ ‘K’ ’ Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Ft-in. mm Ft-in. mm Ft-in. mm 008 840 381 44 20 182 83 156 71 231 105 271 123 2-0 7 ⁄ 8 632 3-5 5 [...]

Step 5 — Make Electrical Connections Unit cabinet must have uninterrupted, unbroken elec- trical 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 elec- trical ground when installed in ac[...]

Fig. 8 — Electric Heater Power Wiring Connections — 50LJQ, 400-3-50; Single Point Kit 50DJ902041 and 50DJ902101 Fig. 9 — Electric Heater Power Wiring Connections — 50LJQ, 400-3-50; Single Point Kit 50DJ902061 and 50DJ902121 8[...]

Fig. 10 — Electric Heater Power Wiring Connections — 50LJQ, 220-3-50; Single Point Kit 50DJ902031 and 50DJ902081 Fig. 1 1 — Electric Heater Wiring Connections — 50LJQ, 220-3-50; Single Point Kit 50DJ902051 and 50DJ9021 1 1 LEGEND FOR FIG. 7-13 EQUIP — Equipment FU — Fuse GND — Ground HTR — Heater TB — T erminal Block 9[...]

Fig. 12 — Electric Heater Power Wiring Connections — 50LJQ, 220-3-50; Single Point Kit 50DJ902091 Fig. 13 — Electric Heater Power Wiring Connections — 50LJQ, 220-3-50; Single Point Kit 50DJ902131 LEGEND FOR FIG. 7-13 EQUIP — Equipment FU — Fuse GND — Ground HTR — Heater TB — T erminal Block 10[...]

T able 2 — Electrical Data UNIT 50LJQ NOMINAL V -PH-HZ VOL T AGE RANGE COMPR (each) OFM IFM ELECTRIC HEA T POWER SUPPL Y ELECTRIC HEA T POWER WIRING FIG. NO. ELECTRIC HEA T P ART NO. 50DJ901— Min Max RLA LRA FLA Hp FLA Nominal kW* FLA MCA MOCP† 008 220-3-50 198 242 15.3 82.0 1.5 1.5 5.8 — — 41.7 50 — — 9.5 24.7 70.3 80 10 71 1 14.6 38[...]

FIELD CONTROL WIRING — Install a Carrier-approved accessory thermostat assembly according to installation in- structions included with the accessory . Locate thermostat as- sembly on a solid wall in the conditioned space to sense av- erage temperature in accordance with thermostat installation instructions. Route thermostat cable or equivalent si[...]

Step 6 — Adjust Indoor-Fan Speed — Adjust in- door fan speed to meet jobsite conditions. For units with electric resistance heating, required mini- mum L/s (cfm) is 1062 (2250) for 50LJQ008 and 1416 (3000) or 50LJQ012, with the following exceptions. UNIT 50LJQ UNIT VOL T AGE HEA TER kW UNIT CONFIG- URA TION REQUIRED MINIMUM L/s Cfm 012 220 50.0[...]

MOTOR MOUNTING NUTS AND BOLTS Fig. 18 — Belt-Drive Motor Mounting T able 5A — Fan R/s at Motor Pulley Settings (SI) 50LJQ MOTOR PULLEY TURNS OPEN 0 1 ⁄ 2 11 1 ⁄ 2 22 1 ⁄ 2 33 1 ⁄ 2 44 1 ⁄ 2 5 008 14.70 14.26 13.82 13.38 12.94 12.50 12.06 1 1.62 1 1.18 10.74 10.30 012 15.00 14.65 14.30 13.95 13.60 13.25 12.90 12.55 12.20 1 1.85 1 1.50 [...]

T able 6 — Fan Performance (SI), 50LJQ008 (50 Hz) — Horizontal Discharge Units AIRFLOW (L/s) EXTERNAL ST A TIC PRESSURE (Pa) 50 100 150 200 250 300 350 400 450 500 r/s BkW r/s BkW r/s BkW r/s BkW r/s BkW r/s BkW r/s BkW r/s BkW r/s BkW r/s BkW 1 100 7.9 0.35 9.4 0.50 10.6 0.68 1 1.7 0.85 12.7 1.03 13.6 1.25 14.4 1.46 14.9 1.69 15.1 1.92 15.0 2.[...]

T able 10 — Fan Performance (English), 50LJQ008 (50 Hz) — Horizontal Discharge Units AIRFLOW (Cfm) EXTERNAL ST A TIC PRESSURE (in. wg) 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp 2200 459 0.42 549 0.62 625 0.83 691 1.06 753 1.31 805 1.58 842 1.87 857 2.16 851 2.45 823 2[...]

ST ART -UP IMPOR T ANT : Ener gize crankcase heaters 24 hours prior to base unit start-up to remove entrapped refrigerant from the oil. Heaters are energized as long as there is power to the unit. Unit Preparation — Make sure that unit has been in- stalled in accordance with these installation instructions and applicable codes. Return-Air Filters[...]

NOTES: 1. In heating mode, economizer damper blade will move to the mini- mum position, and unit will operate as described for units without economizer , regardless of outdoor air temperature. 2. The temperatures given in the graph are for demonstration pur- poses only and may vary depending on which thermostat is used. LEGEND C— Contactor HC —[...]

position of the reversing valves and shuts of f the outdoor fan. The electric heaters (if installed) will be ener gized. On units with economizer , the economizer damper blade will move to the fully closed position. The unit continues to defrost until the coil temperature as measured by DFT2 reaches 65 F or the duration of defrost cycle completes a[...]

CONDENSA TE DRAIN — Check and clean each year at start of cooling season. In winter , keep drain dry or protect against freeze-up. FIL TERS — Clean or replace at start of each heating and cooling season, or more often if operating conditions require it. Replacement filters must be same dimensions as original filters. OUTDOOR-AIR INLET SCREENS[...]

Fig. 25 — Cooling Charging Charts, 50LJQ008 Fig. 26 — Cooling Charging Charts, 50LJQ012 21[...]

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Copyright 1992 Carrier Corporation Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 015-015 Printed in U.S.A. Form 50LJQ-C1SI Pg 24 1-92 Replaces: New[...]