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90MA/MU
Single-Package Marine Cooling Units
Installation, Operation and Service Instructions
SAFETY CONSIDERATIONS CONTENTS Page
The 90MA/MU Units are designed to provide safe and SAFETY CONSIDERATIONS........................................1
reliable service when operated within design specifications. GENERAL .....................................................................1
However, due to system pressures, electrical components,
INSTALLATION...................................
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TABLE 1A - 90MA/MU PHYSICAL DATA – R-134A , ENGLISH UNITS (See Table 2A for SI units) BASE UNIT (90MA/MU) UNITS 308 312 NOMINAL CAPACITY Tons 5.5 8 REFRIGERANT R- OPERATING WEIGHT Base unit 90MA Pounds 895 950 Base Unit 90MU Pounds N/ N/ Discharge Plenum Pounds 50 50 COMPRESSOR TYPE Semi-Hermetic, Recip Qty Cylinders 4 6 Qty Unloading Cylinders 0 2 Qty Capacity Steps 1 2 DISCHARGE PRESSURE SWITCH Opens (90MA) PSIG 335+/-10 Closes (90MA) PSIG 235+/-10 Opens (90MU) PSIG N/ Closes (90MU) P
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TABLE 1B - 90MA/MU PHYSICAL DATA – R-407C , ENGLISH UNITS (See Table 2B for SI units) BASE UNIT (90MA/MU) UNITS 404 406 408 412 NOMINAL CAPACITY Tons 3 5 7.5 10 REFRIGERANT R-407C OPERATING WEIGHT Base unit 90MA Pounds 390 427 895 950 Base Unit 90MU Pounds 330 360 835 890 Discharge Plenum Pounds 25 25 50 50 COMPRESSOR TYPE Scroll Semi-Hermetic, Recip Qty Cylinders N/ 4 6 Qty Unloading Cylinders N/ 0 2 Qty Capacity Steps 1 1 2 DISCHARGE PRESSURE SWITCH Opens (90MA) PSIG 395+/-10 Closes
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TABLE 1C - 90MA/MU PHYSICAL DATA – R-404A , ENGLISH UNITS (See Table 2C for SI units) BASE UNIT (90MA/MU) UNITS 504 506 508 512 NOMINAL CAPACITY Tons 3 5 7.5 10 REFRIGERANT R- OPERATING WEIGHT Base unit 90MA Pounds 390 427 895 950 Base Unit 90MU Pounds 330 360 835 890 Discharge Plenum Pounds 25 25 50 50 COMPRESSOR TYPE Scroll Semi-Hermetic, Recip Qty Cylinders N/ 4 6 Qty Unloading Cylinders N/ 0 2 Qty Capacity Steps 1 1 2 DISCHARGE PRESSURE SWITCH Opens (90MA) PSIG 395+/-10 Closes (90M
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TABLE 2A - 90MA/MU PHYSICAL DATA – R-134A , SI UNITS BASE UNIT (90MA/MU) UNITS 308 312 NOMINAL CAPACITY kW 19.3 28.1 REFRIGERANT R- OPERATING WEIGHT Base unit 90MA kg 406 431 Base Unit 90MU kg N/ N/ Discharge Plenum kg 22.7 22.7 COMPRESSOR TYPE Semi-Hermetic, Recip Qty Cylinders 4 6 Qty Unloading Cylinders 0 2 Qty Capacity Steps 1 2 DISCHARGE PRESSURE SWITCH kPa 2310+/-69 Opens (90MA) Closes (90MA) kPa 1620+/-138 Opens (90MU) kPa N/ Closes (90MU) kPa N/ SUCTION PRESSURE SWITCH Opens
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TABLE 2B - 90MA/MU PHYSICAL DATA – R-407C , SI UNITS BASE UNIT (90MA/MU) UNITS 404 406 408 412 NOMINAL CAPACITY kW 10.5 17.6 26.4 35.1 REFRIGERANT R-407C OPERATING WEIGHT Base unit 90MA kg 177 194 406 431 Base Unit 90MU kg 150 163 379 404 Discharge Plenum kg 11.3 11.3 22.7 22.7 COMPRESSOR TYPE Scroll Semi-Hermetic, Recip Qty Cylinders N/ 4 6 Qty Unloading Cylinders N/ 0 2 Qty Capacity Steps 1 1 2 DISCHARGE PRESSURE SWITCH kPa Opens (90MA) 2725+/-69 Closes (90MA) kPa 2034+/-138 Opens
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TABLE 2C - 90MA/MU PHYSICAL DATA – R-404A , SI UNITS BASE UNIT (90MA/MU) UNITS 504 506 508 512 NOMINAL CAPACITY kW 10.5 17.6 26.4 35.1 REFRIGERANT R- OPERATING WEIGHT Base unit 90MA kg 177 194 406 431 Base Unit 90MU kg 150 163 379 404 Discharge Plenum kg 11.3 11.3 22.7 22.7 COMPRESSOR TYPE Scroll Semi-Hermetic, Recip Qty Cylinders N/ 4 6 Qty Unloading Cylinders N/ 0 2 Qty Capacity Steps 1 1 2 DISCHARGE PRESSURE SWITCH Opens (90MA) kPa 2725+/-69 Closes (90MA) kPa 2034+/-138 Opens (90MU
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Step 4 - Rig and Place Unit - NOTE: Install accessories before placing unit. a. Provide space around unit for service, filter access, and overhead clearance as indicated in Figure 2. b. Move and store unit in upright position. c. Use slings with spacer under base skid to prevent panel damage when using hoist. d. Units as shipped are adequately dampened against vibration. If additional dampening is desired, place sponge rubber or rubber mat, between deck and base of unit or ins
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Step 7 - Install Ventilation-Air Ductwork (If required)- Connect ventilation ducts to flanges on outside-air supply opening (Figure. 2) using a flexible connection. Attach ductwork to ship structure, insulate and cover with vapor barrier to reduce sound transmission and prevent vapor condensation. Weatherproof external ductwork, joints, and openings in accordance with applicable codes. Ducts passing through an unconditioned space must be insulated and covered with a vapor barrier.
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a. Route regulating valve capillary with its flare nut to the fitting on refrigerant discharge line (Figure. 1), using any convenient unused opening on side of unit. Use a grommet in panel to prevent chafing of capillary. b. Remove cap from discharge line fitting. c. Remove cotter pin taped to discharge line fitting. Insert pin, split end first, into regulating valve flare d. Hold flare tightly against fitting while connecting flare nut. Round end of cotter pin will depress core of f
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TABLE 3 - RECOMMENDED LINE SIZES (INCHES) REMOTE CONDENSERS LENGTH OF RUN UNIT REFRIGERANT 90MU TYPE 0-25 26-50 51-75 76-100 DISCH LIQUID DISCH LIQUID DISCH LIQUID DISCH LIQUID 404 R-407C 1/2 3/8 5/8 3/8 5/8 3/8 5/8 3/8 406 R-407C 5/8 3/8 3/4 3/8 3/4 3/8 3/4 3/8 408 R-407C 3/4 1/2 3/4 1/2 7/8 1/2 7/8 1/2 412 R-407C 7/8 1/2 7/8 1/2 7/8 1/2 1-1/8 5/8 504 R-404A 5/8 3/8 5/8 3/8 3/4 3/8 3/4 3/8 506 R-404A 3/4 1/2 3/4 1/2 7/8 1/2 7/8 1/2 508 R-404A 7/8 1/2 7/8 1/2 1-1/8 1/2 1-1/8 5/8 512 R-4
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Step 12 - Make Electrical Connections OPERATION GENERAL - Provide an adequate fused disconnect switch within sight of the unit. Provision for locking switch open CAUTION (OFF) is advisable to prevent power from being turned on when unit is being serviced. Compressor crankcase heater must be energized for 24 hours prior to startup to POWER WIRING - Conduit opening for all units is on left prevent compressor bearing damage. side of unit near control box. Connect field power wir
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SERVICE WARNING NEVER reach into unit while fan is running. LOCK OPEN AND TAG unit disconnect before working on fan. Remove fuses and take them with you after noting this on tag. CAUTION 1. Sharp edges of coil fins are exposed. To prevent injury, cover top of evaporator with cardboard or a few layers of heavy tape. 2. To avoid coil damage, cover evaporator face with plywood or other rigid sheet material. If any coil fins are mashed or FIGURE 8 - FAN PULLEY ADJUSTME
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Evaporator Coil - Observe fan compartment Caution note at the beginning of the Service section. Remove dirt and debris from evaporator coil as required by condition. Clean coil with a stiff brush, vacuum cleaner or compressed air. Use a fin comb of the correct tooth spacing (Refer to Tables 1A/B/C/2A/B/C for coil fins/inch) when straightening mashed or bent coil fins. Water Regulating Valve PREPARATION FOR OPERATION. 1. Open the water regulating valve inlet and outlet isolation
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Charging the System (90MA) - These units are shipped Evaporator-Fan Motor Removal - Motor power wires with a full operating charge. If recharging is necessary need not be disconnected from motor terminals before (complete charge lost), weigh in amount of refrigerant motor is removed from unit. indicated on unit nameplate and in Table 1. 1. Shut off unit main power supply. If unit has partial charge, it must be recharged by removing existing charge and recharging by weighing in WARNING
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compressor equipped units and on the suction line on all other units. Oil Charge - All units are factory charged with oil. On 06D compressors, observe the oil level in the sight glass at start-up. If unit oil level is below sight glass, add oil until level reaches approximately 1/4 sight glass. If oil charge is above sight glass, do not remove any oil until the compressor crankcase heater has been energized for at least 24 hours. When additional oil or a complete charge is require
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FOR NOTES AND LEGEND, SEE FIGURE 13 FIGURE 12 WIRING SCHEMATIC - 90MA/MU*04/*06 Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations Printed in U.S.A. 90MA-3SI SUPERCEDES FORM 62-02971-00 09-2009 Pg 17
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FIGURE 13 COMPONENT ARRANGEMENT - 90MA/MU*04/*06 Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations Printed in U.S.A. 90MA-3SI SUPERCEDES FORM 62-02971-00 09-2009 Pg 18
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FOR NOTES AND LEGEND, SEE FIGURE 15 FIGURE 14 - ELECTRICAL SCHEMATIC - 90MA/MU*08/*12 Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations Printed in U.S.A. 90MA-3SI SUPERCEDES FORM 62-02971-00 09-2009 Pg 19
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FIGURE 15 - COMPONENT ARRANGEMENT - 90MA/MU008/012 Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations Printed in U.S.A. 90MA-3SI SUPERCEDES FORM 62-02971-00 09-2009 Pg 20
