York YPAL 050 manual Operation and Pressure Control Range, Configuration Jumpers and Potentiometers

•If the outdoor air temperature is less then the economizer supply air temperature set point, compressors will not operate regardless of the

“OUTDOOR AIR TEMP COOLING LOCK- OUT” set point.

LOW AMBIENT OPERATION

A condenser fan VFD can be installed on condenser fan # l. When this is installed compressor system 1 (compressors 1A and 1B) can operate down to an outdoor temperature of 0.0º F. The VFD is located in an enclosure on the right hand side of the condenser section, to the right of the system 2 compressors.

To enable low ambient operation when a condenser fan VFD is installed, the following parameter must be programmed:

“LOWAMBIENT KITINSTALLED” - is enabled using Parameter 84 under the PROGRAM key of the Simplicity Elite control board or under the EQUIPMENT INSTALLATION tab in the Simplicity PC software package.

Operation and Pressure Control Range

The VFD controls the speed of the fan based on a discharge pressure setpoint and a differential range. When discharge pressure reaches approximately 270 PSIG, the VFD will start the fan if the Unit Controller is calling for compressor / condenser fan operation. The binary outputs from the Unit Controller are as shown in Table 5-1.

TABLE 5-1 – BINARY OUTPUTS

CONDENSER	CONNECTOR	TERMINAL	WIRE	CONTACTOR
FAN		#	#
1A	P13	1	423	6M

As soon as the contactor is energized, the VFD will be activated and will begin to control. As the pressure rises over the next 80 PSIG (270 – 350 PSIG); the fan speed will increase to full speed at approximately 350 PSIG.

The VFD control input signal originates from the discharge pressure transducer for the compressor system it is controlling. The transducer signal feeds the VFD. The VFD controls the fan speed based on discharge pressure.

FORM 100.50-NOM6 (1207)

Configuration (Jumpers and Potentiometers)

The inverter is configured at the factory. The jumpers must be in the positions shown in Table 5-2.

TABLE 5-2 – VFD JUMPERS

J2	REMOVE	-
J3	REMOVE
J4	REMOVE
J5	MIDDLE
J6	MIDDLE
J7	IN
J8	IN
J9	IN FOR 60 HZ	REMOVE FOR 50 HZ

Potentiometer settings are also preset at the factory. The potentiometers should be in the positions shown in Table 5-3. The potentiometers do not have numerical settings and are set according to the positions indicated. DO NOT change potentiometer settings unless they do not match the positioning of the potentiometers shown in Figure 5-1. Modifying these settings may cause damage to the unit, control problems, and/or poor operating efficiency.

TABLE 5-3 – POTENTIOMETER SETTINGS

P1	P2
		5
350 PSIG	80 PSIG
6 O’CLOCK	6 O’CLOCK

P1 P2 LD113008

FIG. 5-1 – CONDENSER FAN VFD POTENTIOMETER SETTINGS

JOHNSON CONTROLS 73