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30RA010-055
AquaSnap® Air-Cooled Chillers
with ComfortLink™ Controls
50/60 Hz
Controls, Start-Up, Operation,
Service, and Troubleshooting
SAFETY CONSIDERATIONS
Installing, starting up, and servicing this equipment can be
hazardous due to system pressures, electrical components, and This unit uses a microprocessor-based electronic control
equipment location (roof, elevated structures, mechanical system. Do not use jumpers or other tools to short out
rooms, etc.). Only trained, qualified installer
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CONTENTS Page Page Condenser Section and Coils . . . . . . . . . . . . . . . . . . . . . . 60 SAFETY CONSIDERATIONS. . . . . . . . . . . . . . . . . . . . . . . . . 1 COIL CLEANING GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2,3 CLEANING E-COATED COILS MAJOR SYSTEM COMPONENTS. . . . . . . . . . . . . . . . . . .3,4 CONDENSER SECTION General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Check Refrige
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Table 1 — Unit Sizes Contact (dry contacts closed) positions, the chiller is allowed to operate and respond to the scheduling configuration, SCN NOMINAL CAPACITY UNIT configuration and set point data. See Fig. 8. (TONS) 50/60 Hz 30RA010 10/10 Emergency On/Off Switch — The Emergency On/Off 30RA015 14/13 switch should only be used when it is required to shut the 30RA018 16/16 chiller off immediately. Power to the MBB, EMM, and 30RA022 22/20 marquee display is interrupted when this switch is off an
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At each system element, the shields of its communication Table 4 — Output Relays bus cables must be tied together. If the communication bus is RELAY entirely within one building, the resulting continuous shield DESCRIPTION NO. must be connected to a ground at one point only. If the commu- Energize Compressor A1 (010-030) K1 nication bus cable exits from one building and enters another, Energize Compressor A1 and Condenser Fan A1 (032-055) the shields must be connected to grounds at the lightning
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T10 — REMOTE SPACE TEMPERATURE SENSOR OR 5. Connect the other end of the communication bus cable to DUAL LEAVING WATER TEMPERATURE SENSOR — the remainder of the SCN communication bus. One of two inputs can be connected to TB5-5 and TB5-6. See T10 — Dual Leaving Water Temperature Sensor — For appropriate sensor below. dual chiller applications (parallel only are supported), connect the dual chiller leaving fluid temperature sensor (5 k Ω ther- T10 — Remote Space Temperature Sensor — Sensor T10 m
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Fig. 1 — Typical Control Box for 30RA010-030 (022-030 Shown) 6
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Fig. 2 — Typical Control Box for 30RA032-055 (042-055 Shown) 7
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30RA010-018 AQUA SNAP Fig. 3 — Wiring Schematic 30RA010-018 8
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AQUA-SNAP LOW VOLTAGE CONTROL SCHEMATIC (010-018) SEE NOTE 8 SEE NOTE 8 Fig. 3 — Wiring Schematic 30RA010-018 (cont) 9
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30RA022-030 AQUA SNAP Fig. 4 — Wiring Schematic 30RA022-030 10
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AQUA-SNAP LOW VOLTAGE CONTROL SCHEMATIC (022-030) Fig. 4 — Wiring Schematic 30RA022-030 (cont) 11
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30RA032-040 AQUA SNAP Fig. 5 — Wiring Schematic 30RA032-040 12
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AQUA-SNAP LOW VOLTAGE CONTROL SCHEMATIC (032-040) Fig. 5 — Wiring Schematic 30RA032-040 (cont) 13
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30RA042-055 AQUA SNAP Fig. 6 — Wiring Schematic 30RA042-055 14
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AQUA-SNAP LOW VOLTAGE CONTROL SCHEMATIC (042-055) Fig. 6 — Wiring Schematic 30RA042-055 (cont) 15
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(+) (COM) (-) SHIELD CN SCN LEN RED LED - STATUS GREEN LED - YELLOW LED - LEN (LOCAL EQUIPMENT NETWORK) SCN (STERLCO COMFORT NETWORK) INSTANCE JUMPER CEPL130346-01 K11 K10 K9 K8 K6 K5 K7 J1 STATUS J2 LEN J10 J3 J4 K4 K1 K3 K2 SCN J5 J6 J7 J8 J9 Fig. 7 — Main Base Board MODE ENABLE/OFF/REMOTE CONTACT SWITCH Run Status Service Test Temperature TB3 REMOTE Pressures CONTACT Setpoints Alarm Status Inputs OFF SW1 Outputs Configuration ESCAPE ENTER ENABLE Time Clock Operating Modes Alarms OFF SW2 ON SC
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refrigeration circuit is also supplied with a factory-installed SPT (T10) PART NO. 33ZCT55SPT liquid line filter drier and sight glass. The TXV is set at the factory to maintain approximately 8 to SENSOR 12° F (4.4 to 6.7° C) suction superheat leaving the cooler by metering the proper amount of refrigerant into the cooler. All TB5 SEN SEN TXVs are adjustable, but should not be adjusted unless 5 absolutely necessary. The TXV is designed to limit the cooler saturated suction 6 temperature to 55 F
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PWR CEBD430351-0396-01C J1 J2 LEN J4 J3 STATUS J5 J7 J6 TEST 2 GREEN LED - ADDRESS RED LED - STATUS LEN (LOCAL EQUIPMENT NETWORK) DIP SWITCH Fig. 11 — Energy Management Module Table 6 — Part Load Data Percent Displacement, Standard Units without Minimum Load Valve LOADING SEQ A LOADING SEQ B CONTROL 30RA UNIT SIZE STEPS % Displacement Compressor % Displacement Compressor 010,015 (60 Hz) 1 100 A1 —— 150 A1 —— 015 (50 Hz), 018 2 100 A1,A2 —— 142 A1 —— 022 (60 Hz) 2 100 A1, A2 —— 150 A1 —— 022 (50
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Table 7 — Part Load Data Percent Displacement, Standard Units with Minimum Load Valve LOADING SEQ A LOADING SEQ B CONTROL 30RA UNIT SIZE STEPS % Displacement Compressor % Displacement Compressor 1 69/ 71 A1* — — 010 (50/60 Hz) 2 100/100 A1 — — 1 79 A1* — — 015 (60 Hz) 2 100 A1 — — 1 28 A1* — — 015 (50 Hz) 2 50 A1 — — 3 100 A1,A2 — — 1 32/ 31 A1* — — 018 (50/60 Hz) 2 50/ 50 A1 — — 3 100/100 A1,A2 — — 1 27/ 35 A1* — — 022 (50/60 Hz) 2 42/ 50 A1 — — 3 100/100 A1,A2 — — 1 38/ 37 A1* — — 025 (50/60 H
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MINUTES LEFT FOR START — This value is displayed Slow Change Override — The control prevents the capacity only in the network display tables (using Service Tool, stages from being changed when the leaving fluid temperature ComfortVIEW™ or ComfortWORKS® software) and is close to the set point (within an adjustable deadband) and represents the amount of time to elapse before the unit will start moving towards the set point. its initialization routine. This value can be zero without the Ramp Loadin
