LEGEND

NOTES:

1.Factory wiring is in accordance with UL 1995 standards. Field modifications or additions must be in compliance with all applicable codes.

2.Wiring for main field supply must be rated 75 C minimum. Use copper for all units. Maximum incoming wire size for the terminal block is 350 kcmil. Maxi- mum incoming wire size for 100 amp non-fused disconnect is #1 AWG. Maxi- mum incoming wire size for 250 amp non-fused disconnect is 350 kcmil.

3.Terminals 9 and 10 of TB5 are for field external connections for remote on-off.

The contacts must be rated for dry circuit application capable of handling a 24 vac load up to 50 mA.

4. Terminals 1 and 2 of TB5 are connected to the factory-installed chilled water flow switch (CWFS). To add chilled water pump interlock contacts, remove the orange harness wire from TB5-1 and wire contacts in series as shown. The contacts must be rated for dry circuit application capable of handling a 24 vac load up to 50 mA.

5. Terminals 11 and 13 of TB5 are for control of chilled water pump 1 (CWP1) starter. Terminals 13 and 15 of TB5 are for control of chilled water pump 2 (CWP2) starter. The maximum load allowed for the chilled water pump relay is 5 va sealed, 10 va inrush at 24 v. Field power supply is not required.

6. Terminals 12 and 13 of TB5 are for an alarm relay. The maximum load allowed for the alarm relay is 75 va sealed, 360 va inrush at 115 v. Field power supply is not required.

7. Make appropriate connections to TB6 as shown for energy management board options. The contacts for demand limit and ice done options must be rated for dry circuit application capable of handling a 24 vac load up to 50 mA.

8. Care should be taken when interfacing with other manufacturer’s control systems due to possible power supply differences: full wave bridge versus half wave rectification. The two different power supplies cannot be mixed. ComfortLink™ controls use half wave rectification. A signal isolation device should be utilized if a full wave bridge signal generating device is used.

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LEGEND

A

Alarm

CWPI

Chilled Water Pump Interlock

CWP

Chilled Water Pump

EMM

Energy Management

FIOP

Factory-Installed Option

NEC

National Electrical Code

SPT

Space Temperature

TB

Terminal Block

 

Field Power Wiring

 

Field Control Wiring

 

Factory-Installed Wiring

Fig. 26 — Control and Field Power Wiring Diagram — 30RA032-055

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Image 52
Sterling 30RA010-055 manual Legend