520 Indoor / 520 Outdoor Service Manual
Ver. 1.00
82
CONFIDENTIAL
12-18. Manually adjusting the fan motor speed
While the FM+ and the FM++ dipswitch will automatically increase the fan speed, the fan
motor speed on the 520 Indoor or 520 Outdoor can also be manually adjusted. (Refer to
Section 12-5) In order to perform manual adjustments to the speed, a 9007603005 remote
controller is required.
Manually adjusting the fan motor speed of the 520 Indoor or 520 Outdoor will change the
amount of intake air for combustion, which can cause excess CO emission from the exhaust
chamber if the fan motor speed is set incorrectly. Therefore, this procedure should never
be performed unless the Technical Services Department has given consent and
authorization.
Adjusting maximum fan motor speed
1. While the 520 Indoor or 520 Outdoor is in operation, set dipswitch No.4 on the 520 models computer
board to the “ON” position. (Figure 1)
2. On the temperature remote controller, display mode #3 (fan motor speed) by entering the
“Diagnostics mode” (Refer to Section 12-1).
3. Press and hold down the “MAX” button on the computer board. While holding down the “MAX”
button, press either the “Increase” or “Decrease” button to increase or decrease the fan motor speed,
respectively (Figure 2). Refer to the remote controller display to verify that speed has been set to
desired value.
4. After fan speed has been set, set dipswitch No.4 back to the “OFF” position.
Adjusting minimum fan motor speed
1. While the 520 Indoor or 520 Outdoor is in operation, set dipswitch No.4 on the 520 Indoor or 520
Outdoor to the “ON” position. (Figure 1)
2. On the temperature remote controller, display mode #3 (fan motor speed) by entering the
“Diagnostics mode” (Refer to Section 12-1).
3. Press and hold down the “MIN” button on the computer board. While holding down the “MIN”
button, press either the “Increase” or “Decrease” button to increase or decrease the fan motor speed,
respectively (Figure 2). Refer to the remote controller display to verify that speed has been set to
desired value.
4. After fan speed has been set, set dipswitch No.4 back to the “OFF” position.
WARNING
