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66307-YIM-B-0606
22 Unitary Products Group
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’).
BELT TENSION
The tension on the belt should be adjusted as shown in
Figure 22.
FIGURE 21 - HONEYWELL ECONOMIZER CONTROL W7212
N1
N
P1
P
EXH
Set
EXH
Min
Pos
IAQ
Max
IAQ
IAQ
Min
Free
Cool
T
T1
AQ1 AQ
SO+ SO
SR+
SR
A
BC
D
TR TR1
24
Vac
HOT
24
Vac
COM
EF EF1
2
3
4
5
1
+
Exhaust Air
Adjustment
Screw
Exhaust Air LED
Damper Min.
Position
Screw
Indoor Air Quality
Max. Adjustment
Screw
Indoor Air Quality
LED
Indoor Air Quality
Min. Adjustment
Screw
Free Cooling LED
Economizer Enthalpy
Set Point Adjustment
Screw
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.
TABLE 12: SUPPLY AIR LIMITATIONS
Unit Size
Minimum CFM
(m
3
/sec.)
Maximum CFM
(m
3
/sec.)
090
2250 (1) 3750 (1.7)
120
3000 (1.4) 5000 (2.3)