Carrier XRV, 19XR specifications Capacity Overrides, Value

Table 4 — Capacity Overrides

		FIRST STAGE SET POINT		SECOND STAGE SET	OVERRIDE
				POINT	TERMINATION
OVERRIDE
CAPACITY CONTROL	View/Modify	Default	Configurable
	on CVC/ICVC			Value	Value
		Value	Range
	Screen
HIGH CONDENSER		125 psig	90 to 165 psig	>Override	<Override
	SETUP1			Set Point
PRESSURE		(862 kPa)	(620 to 1138 kPa)		Set Point
				+2.4 psid (16.5 kPad)
HIGH MOTOR		>200 F	150 to 200 F	>Override	<Override
	SETUP1			Set Point
TEMPERATURE		(93.3 C)	(66 to 93 C)		Set Point
				+10° F (6° C)
LOW REFRIGERANT				≤Trippoint	>Trippoint
TEMPERATURE			2° to 5° F
(Refrigerant	SETUP1	3° F (1.6° C)		+ Override	+ Override
			(1° to 3° C)
Override Delta				∆T –1° F (0.56° C)	∆T+2° F (1.2° C)
Temperature)
		Min: T1 — 1.5° F	0.5° to 20° F
		(0.8° C)	(0.3° to 8.3° C)
HIGH COMPRESSOR		P1 — 50 psid	30 to 170 psid		Within Lift Limits
	OPTIONS	(345 kPad)	(207 to 1172 kPad)
LIFT				None	Plus Surge/HGBP
		Max: T2 — 10° F	0.5° to 20° F
(Surge Prevention)					Deadband Setting
		(5.6° C)	(0.3° to 8.3° C)
		P2 — 85 psid	50 to 170 psid
		(586 kPad)	(348 to 1172 kPad)
MANUAL GUIDE VANE	CAPACITY	Automatic	0 to 100%	None	Release of
TARGET					Manual Control
MOTOR LOAD —	MAINSTAT	100%	40 to 100%	≥5% of	2% Lower
ACTIVE DEMAND LIMIT				Set Point	Than Set Point
LOW DISCHARGE		Calculated Minimum		2° F (1.1° C)	1° F (0.56° C)
	OVERRIDE	Superheat for	None	Below Calculated	Above Calculated
SUPERHEAT
		Conditions		Minimum Superheat	Minimum Superheat

Alarm (Trip) Output Contacts — One set of alarm contacts is provided in the starter. The contact ratings are pro- vided in the certified drawings. The contacts are located on ter- minal strip J9, terminals 15 and 16.

Refrigerant Leak Detector — An input is available on the CCM module [terminal J5-5(–) and J5-6 (+)] for a refrigerant leak detector. Enabling REFRIGERANT LEAK OPTION (OPTIONS screen) will allow the PIC II controls to go into an alarm state at a user configured level (REFRIGER- ANT LEAK ALARM mA). The input is configured for 4 to 20 mA by setting the DIP switch 1 on SW2 at the ON position, or configured for 1 to 5 vdc by setting switch 1 at the OFF posi- tion. The output of the refrigerant leak detector is displayed as REFRIGERANT LEAK SENSOR on the MAINSTAT screen. For a 1 to 5 vdc input, 1 vdc input represents 4 mA displayed and 5 vdc input represents 20 mA displayed.

Kilowatt Output — An output is available on the CCM module [Terminal J8-1 (+) and J8-2 (–)] to represent the power consumption of the chiller. The 4 to 20 mA signal generated by the CCM module can be wired to the building automation or energy management system to monitor the chiller’s energy consumption. A 4 mA signal represents the chiller in an off state and a 20 mA signal represents the chiller operating at its rated peak kilowatt consumption. The rated peak kilowatt con- sumption is configured by the user in the RAMP_DEM display screen by the setting the MOTOR RATED KILOWATTS from the job data sheet.

Remote Reset of Alarms — A standard feature of the PIC II controls is the ability to reset a chiller in a shutdown alarm state from a remote location. If the condition which caused the alarm has cleared the chiller can be placed back into a normal CCN operating mode when the REMOTE RESET OPTION (CVC_PSWD/ICVC_PSWD menu) is set to EN- ABLE. A variety of Carrier Comfort Network software sys- tems including ComfortVIEW™ or Network Service Tool™ can access the PIC II controls and reset the displayed alarm.

Third party software from building automation systems (BAS) or energy management systems (EMS) can also access the PIC II controls through a Carrier DataLINK™ module and re- set the fault displayed. Both methods would access the CVC_PSWD/ICVC_PSWD screen and force the RESET ALARM? point to YES to reset the fault condition. If the PIC II controls have determined that is safe to start the chiller the CCN MODE? point (CVC_PSWD/ICVC_PSWD screen) can be forced to YES to place the chiller back into normal CCN op- erating mode. The only exceptions are the following alarms that cannot be reset from a remote location: STATE #100, 205, 217-220, 223, 233, 234, 247, and 250. To view alarm codes, re- fer to Troubleshooting Guide, Checking Display Messages, page 76. After the alarm has been reset the PIC II control will increment the Starts in 12 Hours counter by one upon restart. If the limit of 8 starts in a 12-hour period occurs the alarm will be required to be reset at the chiller control panel (CVC/ICVC).

Condenser Pump Control — The chiller will moni- tor the condenser pressure (CONDENSER PRESSURE) and may turn on the condenser pump if the condenser pressure be- comes too high while the compressor is shut down. The con- denser pressure override (COND PRESS OVERRIDE) parame- ter is used to determine this pressure point. COND PRESS OVERRIDE is found in the SETUP1 display screen, which is accessed from the EQUIPMENT SERVICE table. The default value is 125 psig (862 kPa).

If the CONDENSER PRESSURE is greater than or equal to the COND PRESS OVERRIDE, and the entering condenser water temperature (ENTERING CONDENSER WATER) is less than 115 F (46 C), the condenser pump will energize to try to decrease the pressure. The pump will turn off when the con- denser pressure is 3.5 psi (24.1 kPa) less than the pressure over- ride or when the condenser refrigerant temperature (CON- DENSER REFRIG TEMP) is within 3° F (1.7° C) of the enter- ing condenser water temperature (ENTERING CONDENSER WATER).

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