Carrier 30XW150-400 specifications 4 to 20 mA Set Point Control

	90
	80
	70
										Max LWT
	60
Point	50
		Min LWT, Cooler Fluid Type = 1, FLUD=Water
Set
	40
	30
	20
						Min LWT, Cooler Fluid Type = 1, FLUD=Brine
	10
	0
	0	2	4	6	8	10	12	14	16	18	20
						mA Signal					A30-4830

Fig. 18 — 4 to 20 mA Set Point Control

To configure this option while using a Navigator display:

ITEM	ITEM EXPANSION	PATH	VALUE
SP.SE	Setpoint Select	Operating Modes→ SLCT	4-20 mA Setp

Dual Switch — When Set Point Select (Setpoint Select, SP.SE) is configured to 4 (Dual Setp Sw), the unit’s active set point is based on Cooling Set Point 1 (Cooling Setpoint 1, CSP.1) when the Dual Set Point switch contact is open and Cooling Set Point 2 (Cooling Setpoint 2, CSP.2) when it is closed.

To configure this option while using a Touch Pilot display:

DISPLAY NAME	PATH	LINE	VALUE
		NO.
Setpoint Select	Status→ GENUNIT	25	4 (Dual
			Setpoint Switch)

To change this value, a Control Point Force must be applied. When configured correctly, Setpoint Control will indicate Setp Sw.

To configure this option while using a Navigator display:

ITEM	ITEM EXPANSION	PATH	VALUE
SP.SE	Setpoint Select	Operating Modes→ SLCT	Dual
			Setp Sw

Chilled Water Fluid Type Selection — The chilled water fluid must be configured. The fluid type must be config- ured to obtain the proper leaving water set point control range and freeze protection. The Cooler Fluid Type (Cooler Fluid Type, FLUD) can be set to water or brine.

FRESH WATER — Configure the unit for Cooler Fluid Type (Cooler Fluid Type, FLUD) to water for units without brine or glycol installed in the chilled water loop. The factory default fluid type is fresh water. Use this option for fresh water sys- tems. This will allow for a water temperature set point of 38 to 60 F (3.3 to 15.5 C). With water as the selection, the Freeze Point is fixed at 34 F (1.1 C).

To configure this option with the Touch Pilot display:

DISPLAY			PATH		LINE	VALUE
NAME					NO.
Cooler		Main Menu→ Service→ SERVICE1			1	1 = Water
Fluid Type
To configure this option with the Navigator display:
ITEM	ITEM EXPANSION			PATH		VALUE
FLUD	Cooler Fluid Type			Configuration→ SERV		Water

BRINE OR GLYCOL OPERATION — Configure the unit for Cooler Fluid Type (Cooler Fluid Type, FLUD) to brine for brine or glycol chilled water loops. This option will allow for a set point temperature range of 14 to 60 F (–10.0 to 15.5 C). Before configuring this selection, confirm that a suitable anti- freeze has been added and is at a sufficient concentration to protect the loop. Additionally, the Brine Freeze Set Point (Brine Freeze Setpoint, LOSP) must be set for proper freeze protection operation. Set the Brine Freeze Set Point to the burst protection provided by the glycol concentration. This value will be Freeze Point for the fluid.

To configure this option with the Touch Pilot display:

DISPLAY	PATH	LINE	VALUE
NAME		NO.
Cooler Fluid	Main Menu	1	2 = Brine
Type	→ Service→ SERVICE1
Brine Freeze	Main Menu	3	Dependent on
Setpoint	→ Service→ SERVICE1		fluid concentration

To configure this option with the Navigator display:

ITEM	ITEM EXPANSION	PATH	VALUE
FLUD	Cooler Fluid Type	Configuration→ SERV	Brine
LOSP	Brine Freeze	Configuration→ SERV	Dependent on
	Setpoint		fluid concentration

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