10.0.
Setting Terminator Status
The terminating resistance of the indoor/outdoor operation lines should have 1 location set to “with resistance” [SHORT]
if there is 1 refrigerant system. If there are 2 or more refrigerant systems, set 2 locations to “with resistance” [SHORT]. If
2 locations are set to “with resistance”, set the 2 terminating resistances for the outdoor unit nearest to the central control
device, and for the one furthest away, to “with resistance” [SHORT], and all other outdoor units to “without resistance”
[OPEN]. This is to stabilize communications. Setting 3 or more locations to “with resistance” is prohibited.
If the terminating resistance of an outdoor unit for a multi-system of U-20GES3E5 and U-10MES2E8 is set to “with
resistance” [SHORT], set the outdoor unit of the gas heat pump air conditioner to “with resistance” [SHORT], and set the
outdoor unit of the U-10MES2E8 to “without resistance” [OPEN].
Outdoor unit
U-20GES3E5
Outdoor unit
U-20GES3E5
Outdoor unit
U-10MES2E8
Outdoor unit
U-10MES2E8
Outdoor unit
Terminating resistance [SHORT]
Terminating resistance [SHORT]
Terminating resistance [OPEN]
Terminating resistance [OPEN]
Terminating resistance [OPEN]
Refrigerant system 1
Refrigerant system 2
Refrigerant system Z
Central control
device
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Fig. 5
The terminating resistance for the gas heat pump air conditioner is set using DIP switch SW010 on the outdoor main circuit
board.
The terminating resistance for the U-10MES2E8 is set by switching the shorted socket of the terminating resistance pin
(3P) (CN67) of the outdoor unit control board.
[SHORT]
(at shipment)
SHORT / OPEN
The terminating resistance pin (3P) (CN67)
[OPEN]
SHORT / OPEN
Fig. 6
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