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FI 55985 and ending with Serial No. G448588. INDEX UNIT FIGURE DESCRIPTION VOLTS UNIT LABEL DIAGRAM 30HR,HS NUMBER 30HR Rev 070 1 WTri ngTor Part-Winding Start All - - 120 2 Suggested Field Wiring Interlocks All All Same As Below 3 '' 4 ‘ ' ‘ "Locations of 070, 080, 090 Control Components Power Schematic 208,230, 460,575 080-1214 080-1224 A 5 Control Li rcu i t (Simplified Schematic) 6 "7 Control Circuit 100, 110, 120 (Simplified Schematic) Power Schematic 208,230, 460,575 100-1584 100-1594 A 8 ’Locations of Control Componenls GENERAL NOTES 1. Factory wiring is in accordance with the National Electrical Code. Any field modifications or additions must be in compliance with all applicable codes. Field-installed power wires must be rated 75 C minimum. 2. Control circuit is 115-1-60, with 10-amp circuit breaker. 3. Oil pressure safety switches are standard on 30HS units only. Jumpers between terminals] 1 | and and between and are supplied on 30HR units. 4. Manual transfer switch provides the following starting sequences: Three-compressor units — position 1 (terminal A), 3-2-1 ; position 2 (terminal B), 1-2-3. Four-compressor units — position 1 (terminal A), 1-4-3-2; position 2 (terminal B), 3-2-1-4. Stop unit before changing transfer switch position. 5. All field-supplied auxiliary contacts must have a minimum rating of 1250-va inrush and 430-va sealed plus capacity required for field-installed equipment between terminals 1111 and and|~7~],| 5 [and and 12 10 6. With accessory .75-kva control transformer, additional controls up to 3800-va inrush and 175-va sealed may be used. 7. 8. 9. When using a transformer, ground control circuit by connecting green wire from transformer terminal X2 to ground screw (detailed instructions with transformer package). When using field-supplied 115-volt control (L2) must be connected to 24 power, terminal neutral or ground potential. Across-the-line starting is standard on all units. If it is necessary to modify to part-winding start, refer to “Modification For Part-Winding Start.” © Carrier Corporation 1971 475 Form 30HR.HS-7W SEQUENG&OF OPERATION The 115-1-60 control power can be supplied directly from a separate source thru a codeapproved fused disconnect or thru a field-installed accessory transformer with the primary side connected to the unit power terminal block. A double-pole circuit breaker protects the control circuit and serves as the control circuit switch. Crankcase heaters are wired in the control circuit ahead of the START switch, so they are always operative as long as the control circuit breaker is closed. Heaters are wired so they are on only when their respective compressors are cycled off. After a prolonged shutdown of 8 hours or more, the crankcase heaters should be on for 24 hours before starting the unit. When power is supplied to the control circuit and the control circuit breaker is closed, the unit is ready for operation, providing all safety devices are satisfied, interlocks are closed, and instructions on warning labels have been followed. When the START button on the control panel is pressed, a red indicating light on the control panel comes on and the step controller and control relays 1 thru 4 are energized. After a maximum of 1.5 minutes, the recycle relay is energized and the step controller cycles back (in the load direction) to the correct cam position to begin the compressor starting sequence. The compressors start one at a time at brief intervals until the load requirement is satisfied. After completing the starting sequence, the controller stops and starts, unloads and loads the compressors to maintain capacity control in response to water temperature controller demand. Factory cam settings on the step controller protect the compressors against rapid recycling. Complete Unit Stoppage can be caused by any of the following conditions: general power failure, blown fuse in control power feed disconnect, open control circuit breaker, STOP button depressed, open contacts in low water temperature cutout, open contacts in any auxiliary interlock between terminals 11 and 12 . Single-Circuit Stoppage can be caused by open contacts in any motor thermal protector, open contacts in low-pressure switch, open contacts in high-pressure switch, open contacts in oil safety switch (when used), blown compressor circuit fuse. Stoppage of one circuit by safety device action does not affect the other circuit. Besides stopping compressors, all the devices listed except the low-pressure switch will close the liquid line solenoid valve for that circuit. ' àïKî Restart Procedure (after cause lor stoppage is corrected). GENERAL POWER FAILURE - Press START button on control panel. BLOWN FUSE IN POWER FEED DISCONNECT — Replace fuse and press START button on control panel. LOW WATER TEMPERATURE CUTOUT - Press reset button on control (inside control box). Restart is automatic. AUXILIARY INTE...
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