York BP 090, BP120 installation manual Blower Rotation, Supply AIR Limitations, Belt Tension

66307-YIM-B-0606

Exhaust Air

Adjustment

Screw

Exhaust Air LED

Damper Min.

Position

Screw

Indoor Air Quality

Max. Adjustment

Screw

Indoor Air Quality

LED

N1	N	EXH	TR	TR1
		Set

			24	24
P1	P	EXH	Vac	Vac
			HOT	COM

		Min
T1	T	Pos	+
		IAQ	1	2
		Max

AQ1 AQ	IAQ
	5

Indoor Air Quality

Min. Adjustment

Screw

Free Cooling LED

Economizer Enthalpy

Set Point Adjustment

Screw

	IAQ
SO+ SO	Min

		Free
		Cool
SR+	SR
	B	C
	A	D

3

EF

4

EF1

FIGURE 21 - HONEYWELL ECONOMIZER CONTROL W7212

PHASING

Predator® units are properly phased at the factory. Check for proper compressor rotation. If the blower or compressors rotate in the wrong direction at start-up, the electrical connec- tion to the unit is misphased. Change the phasing of the field line connection at the field supplied disconnect to obtain proper rotation. (Scroll compressors operate in only one direction. If the scroll is drawing low amperage, has similar suction and discharge pressures, or producing a high noise level, the scroll is misphased). Units with scroll compressors have a phase monitor as standard equipment. This phase monitor will prevent unit operation under misphased condi- tions by breaking the 24 volt power.

BLOWER ROTATION

Check for proper supply air blower rotation. If the blower is rotating backwards, the line voltage at the unit point of power connection is misphased (See ‘PHASING’).

TABLE 12: SUPPLY AIR LIMITATIONS

Unit Size	Minimum CFM	Maximum CFM
	(m3/sec.)	(m3/sec.)
090	2250 (1)	3750 (1.7)
120	3000 (1.4)	5000 (2.3)

Scroll compressors require proper rotation to oper- ate correctly. Units are properly phased at the fac- tory. Do not change the internal wiring to make the blower condenser fans, or compressor rotate cor- rectly.

BELT TENSION

The tension on the belt should be adjusted as shown in Figure 22.

22 Unitary Products Group