95
Pre-commissioning and Maintenance
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Indoor Unit Auto Addressing
PRE-COMMISSIONING
Auto Addressing Procedure, continued
Figure 80:Auto Address Button Location.
8. Verify how many indoor units and heat recovery units (HR
systems only) are connected to the system.
9. Press and hold red Auto Address Button (Figure 80) for
about five (5) seconds. Release when “88” appears on the
LED. The system begins the auto addressing sequence
listed in Table 67. After three (3) to seven (7) minutes,
the display will flash a number for about ten (10) seconds
indicating how many indoor units the system successfully
communicated with.
10. If the auto addressing procedure is successful, this number
should match the known number of installed indoor units
11. Upon completion of the auto addressing routine, the display
will be blank and the system will be in standby waiting for
another command.
12. Upon successful completion of the auto address procedure,
record the system address assigned to each indoor unit by
the auto address procedure in the column provided on the
Pre-commissioning Device Configuration Worksheet.
13. After recording the system addresses assigned to each
device, open the water source unit disconnect. Remove the water
source unit to indoor unit communications cable from terminals
IDU(A) and IDU(B). Protect conductors by placing electrical tape
over the bare ends.
14. Once again, verify the water source unit to indoor unit(s) commu-
nications cable is not connected to terminals IDU(A) and IDU(B) of
the water source unit. Close the disconnect to reapply power to the
water source unit and energize the compressor crankcase heater.
15. Replace the control panel door.
Sequence Code Displayed Description
1 88 Auto addressing procedure begins
2 88 Auto addressing procedure continues for approximately 3 to 7 minutes (15 minutes maximum)
3 See Description Number of indoor units found displays
4 See Description Number of heat recovery units found displays (HR systems only)
5 Blank Auto addressing procedure is complete
Table 67: IDU Auto Addressing Display Sequence.
DIP SW01 LED
Auto Address
Button (Red)
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