Phasing; Checking Supply Air Cfm; Charging Chart - Wj300 - York SUNLINE MAGNUM WJ240 Installation Manual

284812-YIM-D-1008
FIGURE 19 - CHARGING CHART - WJ300

PHASING

YORK MODEL WJ 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 connection to the unit is mis-
phased. Change the incoming line connection phasing
to obtain proper rotation. (Scroll compressors operate
in only one direction. If the scroll is drawing low amper-
age, has similar suction and discharge pressures, or
producing a high noise level, the scroll is misphased).
Scroll compressors require proper rotation to
operate correctly. Units are properly phased at
the factory. Do not change the internal wiring to
make the blower, condenser fans, or compres-
sor rotate correctly.

CHECKING SUPPLY AIR CFM

The RPM of the supply air blower will depend on the
required CFM, the unit accessories or options and the
static resistances of both the supply and the return air
54
25 Ton Charging Chart
350
330
310
290
270
250
230
210
190
170
150
55 60 65
Suction Pressure (psi)
1. Make sure that both condenser fans are running when charging. One fan may switch off at
lower ambient temperatures making the chart above inaccurate.
2. This chart is applicable to unit with the TXV's left to the factory setting. If the TXV's have been
adjusted in the field, the charging chart may no longer apply.
Outdoor Temp
70 75 80
duct systems. With this information, the RPM for the
supply air blower and the motor pulley adjustment
(turns open) can be determined from the Blower Per-
formance Data Tables.
Belt drive blower systems
to the specific static and CFM requirements
for the application. The belt drive blowers are
set at the factory for any specific static
NOT
or CFM. Adjustments of the blower speed an
belt tension are
REQUIRED
pulley and motor sheave set screws after
these adjustments. Re-checking set screws
after 10-12 hrs. run time is recommended.
High speed drive accessories (containing a smaller
blower pulley and a shorter belt) are available for appli-
cations requiring the supply air blower to produce
higher CFM's and/or higher static pressures. Use
Model 1LD0460 for 15 ton units, Model 1LD0417 for
17.5 and 20 ton units, and Model 1LD0435 for 25 ton
units. Refer to the Blower Motor and Drive Data
Table 30.
(ºF)
115º
105º
95º
85º
75º
65º
85
be adjusted
MUST
. Tighten blower
Johnson Controls Unitary Products