Maintenance
WARNING
Electric shock hazard. Can cause injury or death. Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at disconnect switch(es). Unit may have multiple power supplies.
WARNING
Improper installation, adjustment, alteration, service or maintenance can cause personal injury, loss of life, or damage to property.
Installation and service must be performed by a licensed professional installer (or equivalent) or a service agency.
DEALER
Verifying Fan Motor Operation
FAN MOTOR CONTROL AND START UP
This motor control is used in controlling motors which employ a Pulse Width Modulation (PWM) controller. A PWM signal will run the fan motor at a revolutions per minute (RPM) that corresponds to a specific PWM signal.
VERIFYING JUMPER SETTINGS (J2)
The unit is shipped from the factory with the default motor RPM setting required for the specific model size. Use table 11 for one−stage to verify that the jumpers are set correctly for the specific size unit.
Table 11. One Stage oltage Outputs
VERIFYING LED STATUS CODES
During start up, the fan motor control LED will display any error conditions. If error conditions exist then no other codes will display. If no error conditions are present, then the stage status and and RPM indicator are displayed. Fan motor speeds are not adjustable for a single stage outdoor unit (see table 11).
VERIFYING CORRECT DC OUTPUT VOLTAGE (J2) The following three methods can be used to determine whether the fan motor is operating at the correct RPMs based on unit size.
1.Use the information provided in tables 11 to verify that all four jumper terminals are set correctly for the specific size unit.
2.Verify LED RPM indicator is displaying the correct flash sequence for the applicable size unit (see Table 11).
3.Test DC voltage output on the Motor Control’s J2 terminals (see Figure 23) while under full load and verify the voltage read to the voltage listed in Table 11 for the applicable size unit.
4.If no voltage is detected at the J2 terminals, verify there is a Y1 demand at the thermostat and 24V present at the Fan Control’s EXT PWR/R terminal during that Y1 demand (see Figure 24).
5.If 24V is present at the Fan Control EXT PWR/R terminal during a Y1 thermostat demand, and no voltage is present at the J2 terminals, then Fan Control should be replaced.
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| 4 | 3 | 2 | 1 | RPM |
| (J2) DC Volt |
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XP/XC17−048, −060 | 9 | OFF | OFF | OFF | ON | 675 |
| 21.6 |
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XP/XC17−036, −042 | 8 | OFF | OFF | ON | ON | 600 |
| 19.2 |
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XP/XC17−030 | 6 | OFF | ON | ON | OFF | 450 |
| 14.3 |
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XP/XC17−024 | 5 | OFF | ON | ON | ON | 400 |
| 12.7 |
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* LED Code indicates Fan Control LED flash sequence. For example, LED Code 9 indicates 9 slow flashes and pause.
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