Phasing; Checking Supply Air Cfm; Charging Chart - 25 Ton - York SUNLINE MagnaDRY WR300 Installation Manual
Gas/electric single package air conditioners
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Also See for SUNLINE MagnaDRY WR300:
- Technical manual (56 pages) ,
- Technical manual (56 pages)
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FIGURE 18 - CHARGING CHART - 25 TON
PHASING
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 misphased.
Change the incoming line connection phasing 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 pro-
ducing a high noise level, the scroll is misphased).
Scroll compressors require proper rotation to
operate correctly. Do not change the internal
wiring to make the blower, condenser fans, or
compressor rotate correctly. Change the
incoming power to the main terminal block to
obtain proper rotation.
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
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.
Johnson Controls Unitary Products
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Belt drive blower systems MUST be adjusted to the
specific static and CFM requirements for the
application. The belt drive blowers are NOT set at the
factory for any specific static or CFM. Adjustments of
the blower speed an belt tension are REQUIRED.
Tighten blower pulley and motor sheave set screws
after these adjustments. Re-checking set screws
after 10-12 hrs. run time is recommended.
Note the following:
1. The supply air CFM must be within the limitations
shown in the Unit Application Data Table 1.
2. Pulleys can be adjusted in half turn increments.
3. The tension on the belt should be adjusted as
shown in the Belt Adjustment Figure 19.
4. Tighten blower pulley and motor sheave set screws
after any adjustments. Re-check set screws after
10-12 hrs. run time is recommended.
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Troubleshooting
