Ingersoll-Rand HP50-PE, EP50-PE Contactor, star, Relay, delta starting 10 sec, TRa Contact, relay

OPERATING INSTRUCTIONS – ELECTRO–PNEUMATIC 27

LEGEND

1PS	Switch, pressure
1RPS	Switch, high refrigerant pressure (option)
2RPS	Switch, fan pressure (option)
RST	Switch, reset
S1	Switch, selector (modulation option)
1S	Contactor, star
1Sa, b	Contacts, aux. star contactor
SS	Switch, selector Off/On
1SV	Valve, solenoid (load) N.C.
3SV	Valve, solenoid (blowdown) N.O.
5SV	Valve, solenoid (modulation option)
6SV	Valve, solenoid (modulation option)
TD	Relay, delta starting (10 sec.)
TDa	Relay, delay off contact
TDR1	Relay timed delay (10 sec.)
TDR1a	Contact, relay – timed

TDR1b	Contact, relay – instant
TR	Relay, restart, time delay (6 min)
TRa	Contact, relay
VAR	Varistor
	Barrier terminal strip

NOTES

1.Approved fused disconnect or circuit breaker per N.E.C. requirements must be provided by customer.

2.Dashed lines represent wiring by customer.

3.Sizing of electrical components not supplied by Ingersoll Rand is the responsibility of the customer and should be done in accordance with the information on the compressor data plate N.E.C. and local electrical codes.

4..When changing the supply voltage, ensure that:

a)The motor and the transformer are rewired for the new voltage

b)The motor overload is adjusted to the proper setting.

5.Verify actual motor conditions with motor schematic.

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