XC21 Field Operational Checklist
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| Cooling*** |
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| Heating*** |
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Unit Readings | Y1 | Expected results | Y2 | Y1 | Expected results | Y2 Second |
| First | during Y2 demand | Second | during Y2 demand | ||
| First Stage | Stage | ||||
| Stage | (toggle switch ON) | Stage | (toggle switch ON) | ||
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Compressor |
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Voltage |
| Same |
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| Same |
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Amperage |
| Higher |
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| Higher |
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Condenser Fan motor |
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Amperage |
| Same or Higher |
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| Same or Higher |
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Temperature |
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Ambient |
| Same |
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| Same |
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Outdoor Coil Discharge Air |
| Higher |
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| Lower |
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Compressor Discharge Line |
| Higher |
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| Higher |
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Indoor Return Air |
| Same |
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| Same |
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Indoor Coil Discharge Air |
| Lower |
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| Higher |
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Pressures |
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Suction (Vapor) |
| Lower |
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| Down |
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Liquid |
| Higher |
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| Higher |
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Note − Unit may have a low ambient control or control that locks in second−stage operation below its set point. It may be necessary to remove a wire from the control when performing this check.
** On the XC21 units, the System Operation Monitor controls the second−stage solenoid coil in compressor.
*** Cooling Mode Operation − Block outdoor coil to maintain a minimum of 375 psig during testing.
Page 17
XC21 SERIES
