Carrier 30XW150-400 specifications A - Cooling Set Point Selection with Touch Pilot Display

CCN Control — With CCN Operating Type control, the ma- chine operates under CCN control as long as the Enable/Off/ Remote Contact Switch is in the Enable or Remote Contact position (external contacts closed.) To operate under this Operating Control, OPER must be set to CCN CONTROL. An external CCN device, such as Chillervisor, controls the On/Off state of the machine. When controlled by a Chillervisor, it is recommended that the Auto Start When SM Lost (AU.SM) be set to Yes.

Careful evaluation of Chilled Water Plant control should be reviewed. In the event Local Control is established, be sure that all pumps, valves, and other devices are capable of operating properly. In the event of a loss of communication with the net- work, the machine will start and be controlled locally. The CCN device forces the variable CHIL_S_S to control the chill- er. The Unit Run Status (STAT) will indicate the current status of the machine (OFF, RUNNING, STOPPING or DELAY), depending on the CCN command. The unit Occupied status (OCC) will indicate the current occupied state according to the CCN command and will be displayed as either NO or YES. The Status Unit Control Type (CTRL) will be LOCAL OFF when the Enable/Off/Remote Contact switch is Off. The Status Unit Control Type will be CCN when the Enable/Off/Remote Contact switch input is Closed and the CHIL_S_S variable is Stop or Start.

For Dual Chiller Control applications, the Slave Chiller must be enabled using the CCN CONTROL option.

ITEM	ITEM EXPANSION	PATH	VALUE
OPER	Operating Control	Operating	CCN
	Type	Modes→ SLCT→ OPER	CONTROL
AU.SM	Auto Start when	Configuration→ SERV	YES
	SM Lost

Entering Fluid Control Option — The factory de- fault for the chilled water fluid set point is controlling to the leaving water temperature. An option to configure the machine for entering water control is available. The control operation remains the same except the control point is focused on the entering water temperature, rather than the leaving water tem- perature when configured.

To configure this option for the Touch Pilot™ display:

DISPLAY NAME	PATH	LINE	VALUE
		NO.
Entering Fluid	Service\	5	No = Leaving Water Control
Control	SERVICE1		Yes = Entering Water Control

To configure this option for the Navigator™ display:

ITEM	ITEM EXPANSION	PATH	VALUE
EWTO	Entering Water	Configuration→ SERV	No = Leaving
	Control		Water Control
			Yes = Entering
			Water Control

Cooling Set Point Selection — Several options for controlling the Leaving Chilled Water Set Point are offered and are configured by the Cooling Set Point Select (Setpoint Se- lect, SP.SE) variable. In addition to the Cooling Set Point Se- lect, Ice Mode Enable discussed later in this book, and Heat Cool Select (Heat/Cool Select, HC.SE) variables also have a role in determining the set point of the machine. All units are shipped from the factory with the Heat Cool Select set to 0.

All default set points are based on Leaving Water Control (Entering Fluid Control, EWTO) set to No. Values must be confirmed for the individual set points. Limits for the set points are listed in the configurations noted below.

To configure these options for the Touch Pilot display, see Table 20A. To configure these options for the Navigator dis- play, see Table 20B.

Table 20A — Cooling Set Point Selection

with Touch Pilot Display

DISPLAY NAME	PATH	LINE NO.	VALUE
Cooling Setpoint 1	Setpoint	2	Range: 14 to 70 F
			(–10.0 to 21.1 C)
			Default: 44 F (6.6 C)
Cooling Setpoint 2	Setpoint	3	Range: 14 to 70 F
			(–10.0 to 21.1 C)
			Default: 44 F (6.6 C)
Cooling Ice Setpoint	Setpoint	4	Range: -20 to 32 F
			(–28.9 to 0 C)
			Default: 44 F (6.6 C)

Table 20B — Cooling Set Point Selection

with Navigator Display

ITEM	ITEM EXPANSION	PATH	VALUE
CSP.1		Setpoints→ COOL	Range: 14 to 70 F
	Cooling Setpoint 1		(–10.0 to 21.1 C)
			Default: 44 F (6.6 C)
CSP.2		Setpoints→ COOL	Range: 14 to 70 F
	Cooling Setpoint 2		(–10.0 to 21.1 C)
			Default: 44 F (6.6 C)
CSP.3		Setpoints→ COOL	Range: -20 to 32 F
	Ice Setpoint		(–28.9 to 0 C)
			Default: 44 F (6.6 C)

In all cases, there are limits on what values are allowed for each set point. These values depend on the Cooler Fluid Type and the Brine Freeze Set point, discussed later. See Table 21.

Table 21 — Configuration Set Point Limits

	COOLER FLUID TYPE
SET POINT LIMITS	(COOLER FLUID TYPE, FLUD)
	1, Water	2, Brine
Minimum *	38 F (3.3 C)	14 F (–10.0 C)
Maximum	60 F (15.5 C)

*The minimum set point for Medium Temperature Brine applications is related to the Brine Freeze Point. The set point is limited to be no less than the Brine Freeze Point +5° F (2.8° C).

The Setpoint Select configuration can be set to five different control options: Set Point Occupancy, Set Point 1, Set Point 2, 4-20 mA Input, and Dual Switch.

CAUTION

Brine duty application (below 40 F [4.4 C] LCWT) for chiller normally requires factory modification. Contact a Carrier Representative for details regarding specific applications. Operation below 40 F (4.4 C) LCWT with- out modification can result in compressor failure.

SET POINT OCCUPANCY — Set Point Occupancy is the default configuration for the Setpoint Select variable. When Setpoint Select (Setpoint Select, SP.SE) is configured to 0 (Setpoint Occ), the unit’s active set point is based on Cooling Set Point 1 (Cooling Setpoint 1, CSP.1) during the occupied period while operating under Time Schedule 1 (SCH1). If the Time Schedule 2 (SCH2) is in use, the unit’s active set point is based on Cooling Set Point 1 (Cooling Setpoint 1, CSP.1) dur- ing the occupied period and Cooling Set Point 2 (Cooling Set- point 2, CSP.2) during the unoccupied period. See Tables 22 and 23.

To configure this option while using a Touch Pilot display:

DISPLAY NAME	PATH	LINE NO.	VALUE
Setpoint select	Status→ GENUNIT	25	0 (Setpoint Occupied)

To change this value, a Control Point Force must be applied. When configured correctly, Setpoint Control (Setpoint Con- trol, SP.SE) will indicate Auto.

To configure this option while using a Navigator display:

ITEM	ITEM EXPANSION	PATH	VALUE
SP.SE	Setpoint Select	Operating Modes→ SLCT	Setpoint Occ

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