Typical control wiring schematics, A30-4697

Typical control wiring schematics

30XW UNIT CONTROL WIRING SCHEMATIC

a30-4697

	LEGEND
AWG	— American Wire Gage	NEC	— National Electrical Code
CB	— Circuit Breaker	PMP	— Chilled Water Pump
COM	— Communication Port	PMPI	— Chilled Water Pump Interlock
EMM	— Energy Management Module	TB	— Terminal Block
EQUIP GND	— Equipment Ground		Field Power Wiring
FIOP	— Factory-Installed Option		Field Control Wiring
MLV	— Minimum Load Valve		Factory-Installed Wiring

NOTES:

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

2.Wiring for main field supply must be rated 75C minimum. Use copper for all units. Incoming wire size range for the terminal block is #4 AWG to 500 kcmil for single point power (two conductors per phase). Incoming wire size range for the terminal blocks for dual point power option is #4 AWG to 500 kcmil for single point power (one conductor per phase). Incoming wire size range for 200/300-v models is 3/0 to 500 kcmil for sin- gle point power (one conductor per phase).

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 for external connections of chilled water pump interlock. 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 (PMP 1) starter. Terminals 15 and 13 of TB5 are for control of chilled water pump 2 (PMP 2) starter. Remove factory-installed jumper when using pump interlock. 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.For control of chilled water pumps, a set of normally open contacts rated for dry circuit application must be supplied from field-supplied pump starter relay. Connect contacts directly to connector at main base board channel 18.

7.Terminals 12 and 13 of TB5 are for an alarm relay. The maximum load allowed for the alarm relay is 10-va sealed, 25-va inrush at 24-v. Field power supply is not required.

8.Make appropriate connections to TB6 as shown for energy management board options. The contacts for occupancy override, demand limit, and ice done options must be rated for dry circuit application capable for han- dling a 24-vac load up to 50 mA.

9.Terminal blocks TB5 and TB6 are located in the display panel box for all units. Refer to certified dimensional drawing for each unit to get the exact locations.

10.Refer to certified dimensional drawings for exact locations of the main power and control power entrance locations.

11.For control of condenser pump, connect field-supplied relay (max 5-va sealed, 10-va inrush at 24-v) directly to connector at main base board channel 22.

12.For head pressure control option, 0-10-vdc signal wires are factory- installed (violet and brown) from HGBP/COND board channel 9. Refer to controls manual for application with field-supplied water regulating valve.