Johnson Controls YVAHP0721CW Series, Service Manual

Page: 176 / 416

3-12
SM-16007
TROUBLESHOOTING
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The factory setting for the No. 1 pin of DSW10 (for the setting of end
terminal resistance) is in the “ON” position.
If there is one number in the same communication line (H-LINK ll),
set all No. 1 pins of DSW10 in the “OFF” position except the main
outdoor Unit A.
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DSW7 is used for setting of rated voltage for the outdoor unit as
shown at the right.
When the site power source voltage is different from the factory
setting, DSW7 setting is required.
NOTE:
The same voltage setting is required for the main unit and sub unit(s).
Verify the DSW7 DIP switch settings match the same voltage as the
power source.
If there is more than one refrigerant cycle in the same communication line (H-LINK ll), set all No. 1 pins of
DSW10 in the “OFF” position except one outdoor unit.
1 2 1 2
ON
OFF
ON
OFF
Factory Setting Cancellation
DSW10
Setting of End Terminal Resistance
Voltage DSW7 Setting
208V
230V
460V
1 2 3 4
ON
OFF
1 2 3 4
ON
OFF
1 2 3 4
ON
OFF
1 2
DSW10
1 2
DSW10
1 2
DSW10
Communication Line
(No Polarity)
H-LINK II
Outdoor Unit
(Unit Combination)
Indoor
Unit
Cancel the end terminal setting.
Set the end terminal.
Unit A
(Main) Unit B
(Sub) Unit C
(Sub)
1 2
DSW10
1 2
DSW10
1 2
DSW10
1 2
DSW10
1 2
DSW10
1 2
DSW10
1 2
DSW10
Communication Line
(No Polarity)
H-LINK II
Outdoor Unit
(Unit Combination)
Indoor
Unit
Wired Controller
Indoor
Unit
Indoor
Unit
Indoor
Unit
Outdoor Unit
(Base Unit)
Cancel the end terminal.
Cancel the end terminal setting.
Cancel the end terminal. Cancel the end terminal.
Outdoor unit being
set end terminal
Set the end terminal. Outdoor Unit
(Unit Combination) Outdoor Unit
(Base Unit)
Unit A
(Main) Unit B
(Sub) Unit C
(Sub)
Unit A
(Main) Unit B
(Sub)