Mitsubishi Electric PAC-IF071B-E Installation Manual page 54

9. Multiple outdoor units control
9.4 Main remote controller wiring
(a) Wire the main remote controller to TBI.6 RC terminals on the main unit. The main remote controller must NOT be connected to a sub unit.
(b) Use the daisy chain wiring method to wire the main unit and sub units by connecting TBI.6 RC terminals. *1
*1 The maximum length between each units wiring is 10 m. The maximum length of total daisy-chain wiring is 500 m.
PAC-SIF051B-E
Main remote controller
Max.
500 m
Note: Wiring for main remote controller cable and daisy chain cable shall be (5 cm or more) apart from power source wiring so that it is not influenced by electrical
noise from power source wiring. (Do NOT insert main remote controller cable and power source wiring in the same conduit.)
9.5. Connecting the thermistor cables
Connect the thermistor for the FTC (Sub) controller.
9.5.1. Connecting the refrigerant pipe temp. thermistor (TH2) cable
Connect the TH2 cable to the CN21 connector on FTC (Sub).
For split Outdoor unit : Connect TH2.
For packaged Outdoor unit : It is NOT necessary to connect TH2.
When the TH2 cable is too long, bundle the excess cable outside the FTC (Sub) unit.
Do not bind the wires in the FTC (Sub) unit.
<Thermistor position>
Place TH2 on refrigerant piping ( liquid side).
It is recommended to protect the thermistor with heat insulating materials so as not to be affected by ambient temperature.
Note: Be sure to place TH2 where it correctly detects refrigerant piping temp. (liquid side).
Because;
(1) TH2 is required to detect heating subcool correctly.
(2) Refrigerant temperature of water-to-refrigerant heat exchanger also needs to be detected for protection purpose.
9.5.2. Connecting the flow water temp. thermistor (THW1) cable and the return water temp. thermistor (THW2) cable
The THW1 and the THW2 cables share a connector, and the connector connects to CNW12 connector on FTC (Sub).
When the THW1 and THW2 cables are too long, bundle the excess cables outside the FTC (Sub) unit. Do not bind the wires in the FTC (Sub) unit.
<Thermistor position>
Place THW1 on water piping (water outlet side) after booster heater, and THW2 on the water inlet side.
It is recommended to protect the thermistor with heat insulating materials so as not to be affected by ambient temperature.
Note: Be sure to attach THW1 where it correctly detects Flow temp. (water outlet side). For more details, see Page 5.
Caution:
Do not route the thermistor cables together with power cables.
The sensor part of the thermistor should be installed where user can not access.
en
9.6 Dip switch functions
<Outdoor unit>
• Set refrigerant address on each outdoor unit from 1 to 6.
Note: Do NOT use refrigerant address 0 as 0 is used for FTC (Main). The address range is from 1 to 6.
53
Main unit
TBI.6
5 . . . .
1 2 3 4
Max. 10 m
1 2 3 4
TBIN
Max. 10 m
TBIN
1 2 3 4
Sub units
1 2 3 4
Hydrobox (with FTC (Main) that is set as sub)
Main remote controller
Main unit
TBI.6
1 2
TBI.6
1 2
Max.
500 m
TBI.6
1 2
Sub units
1 2
<
Fig. 9.4.1>
RC
3 4 5 6 7 8
Max. 10 m
3 4 5 6 7 8
Max. 10 m
3 4 5 6 7 8
3 4 5 6 7 8
IN2
Connector CN21
Connector CNW12
<Fig. 9.5.1>