Carrier 38AH044-084 User Manual

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.PC 1

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11Fig. 7 — Dual-Circuit Units Control Label Diagram, All Voltages

12Continued on next page Continued on next page

13Fig. 8 — Dual-Circuit Units, Variable Air Volume Label Diagram with Typical Modupanel™ Control Wiring, All Voltages

14Fig. 9 — Control Circuit Wiring with 24-V Accessory Relay andOne 2-Stage Carrier Communications Temperature Monitor, All Voltages (Dual-Circuit Unit

15Fig. 9 — Control Circuit Wiring with 24-V Accessory Relay andOne 2-Stage Carrier Communications Temperature Monitor, All Voltages (Dual-Circuit Unit

16LLS — Liquid Line SolenoidSDR — Solenoid Drop RelayTB — Terminal BlockTR — Timer RelayFactory WiringField WiringC—Compressor ContactorCR — Control R

17Fig. 10 — Control Circuit Wiring with 24-V Accessory Relays andTwo-Stage Carrier Communications Temperature Monitors, All Voltages (Dual-Circuit Uni

18Fig. 11 — Optional Single-Circuit Units, Component Arrangement, All Voltages

19Fig. 12 — Optional Single-Circuit Units Power Label Diagram — Units 38AH044-064; 208/230-3-60, 346-3-50, 230-3-50

2OPERATING SEQUENCETimer Functions —(See Timer Cycle, Fig. 1.) Eachcompressor is operated by an independent timer motor whichallows for the independen

20Fig. 13 — Optional Single-Circuit Units Power Label Diagram — Units 38AH044-064; 460-3-60, 575-3-60, 380-3-60, 380/415-3-50

21Fig. 14 — Optional Single-Circuit Units Power Label Diagram — Units 38AH074,084; 208/230-3-60, 346-3-50

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23Fig. 15 — Optional Single-Circuit Units Power Label Diagram — Units 38AH074, 084; 460-3-60, 575-3-60, 380-3-60, 380/415-3-50

24Continued on next page

25Fig. 16 — Optional Single-Circuit Units Control Label Diagram, All Voltages

26Continued on next page Continued on next page

27Fig. 17 — Optional Single-Circuit Units, Variable Air Volume Control Label Diagram,with Typical Modupanel™ Control Wiring, All Voltages

28LLS — Liquid Line SolenoidSDR — Solenoid Drop RelayTB — Terminal BlockTR — Timer RelayFactory WiringField WiringC—Compressor ContactorCR — Control R

29Fig. 18 — Control Circuit Wiring with 24-V Accessory and One 2-StageCarrier Communications Temperature Monitor, All Voltages (Single-Circuit Units)

3Head Pressure ControlDual-circuit units: Fan cycling pressure switches (one on eachcircuit) close at 264 ± 7 psig (1820 ± 48 kPag) and open at160 ± 7

30MOTORMASTER®III CONTROLINSTALLATIONBefore installing Motormaster III control, refer to generalinformation in Installation Instructions shipped with

31LEGEND*For thermistor (sensor) signal, move switch to the left.NOTE: Thermistor is designated in text as “sensor.”Fig. 20 — Motormaster III Control

32LEGENDFig. 21 — Motormaster®III Control Fan Power Wiring — Units 38AH044-064FC — Fan ContactorFCB — Fan Circuit BreakerFM — Fan MotorMMSN — Motormas

33LEGENDFig. 22 — Motormaster®III Control Fan Power Wiring — Units 38AH074, 084FC — Fan ContactorFCB — Fan Circuit BreakerFM — Fan MotorMMSN — Motorma

34LEGENDFig. 23A — Motormaster®III Control 575-v Units, Autotransformer Circuit — Units 38AH044-064FC — Fan ContactorFCB — Fan Circuit BreakerFM — Fan

35LEGENDFig. 23B — Motormaster®III Control 575-v Units, Autotransformer Circuit — Units 38AH074, 084FC — Fan ContactorFCB — Fan Circuit BreakerFM — Fa

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.PC 1

4LEGEND (Fig. 2-15)NOTES (Fig. 2-8 and 11-17)1. 208/230V units are factory wired for 230-v power supply. For 208-v powersupply, connect yellow wire to

5Fig. 2 — Dual-Circuit Units, Component Arrangement, All Voltages

6Fig. 3 — Dual-Circuit Units, Power Label Diagram — Units 38AH044-064; 208/230-3-60, 346-3-50, 230-3-50

7Fig. 4 — Dual-Circuit Units, Power Label Diagram — Units 38AH044-064; 460-3-60, 575-3-50, 380-3-60, 380/415-3-50

8Fig. 5 — Dual-Circuit Units, Power Label Diagram — Units 38AH074,084; 208/230-3-60, 346-3-50

9Fig. 6 — Dual-Circuit Units, Power Label Diagram — Units 38AH074,084; 460-3-60, 575-3-60, 380-3-60, 380/415-3-50