Mitsubishi Electric PAC-IF051B-E Installation Manual page 23

4. Electrical work

4. Wiring for 2-zone temperature control

1. Water circulation pump 2 (Zone1 water circulation pump) / Water circulation pump 3 (Zone2 water circulation pump)

Electrically wire water circulation pumps 2 and 3 to the appropriate output terminals. (Refer to "Outputs" in 4.5.)

2. Flow switch 2 (Zone1 flow switch) / Flow switch 3 (Zone2 flow switch)

Connect flow switches 2 and 3 to the appropriate terminals. (Refer to "Signal inputs" in 4.5.)

Set dip switches 3-2 and 3-3 according to the functions of individual flow switches 2 and 3. (Refer to "Dip switch setting" in 5.)

3. Thermistor

Connect the thermistor to monitor the Zone1 flow temp. to the THW6 (TBI. 2-7 and 2-8) terminals.

Connect the thermistor to monitor the Zone1 return temp. to the THW7 (TBI. 2-9 and 2-10) terminals.

Connect the thermistor to monitor the Zone2 flow temp. to the THW8 (TBI. 2-1 and 2-2) terminals.

Connect the thermistor to monitor the Zone2 return temp. to the THW9 (TBI. 2-11 and 2-12) terminals.

The maximum length of the thermistor wiring is 5 m. Do not splice the wiring to extend or shorten it, or this could affect correct monitoring of each hot water temperature

through zones.

If the wiring is too long, bundle it with a strap to adjust the length.

4. Motorized mixing valve

Connect three wires coming from the motorized mixing valve to the appropriate terminals referring to "Outputs" in 5.2.

Note: Connect the signal line to open Port A (hot water inlet port) to TBO. 1-14 (Open), the signal line to open Port B (cold water inlet port) to TBO. 1-12 (Close),

and the neutral terminal wire to TBO. 1-13 (N).

N

FTC4

(Master)

TBO.1

12 13 14

Close N Open

L

from mixing tank

to mixing tank

to Zone2 heat emitter

A

Motorized mixing valve

B

from Zone2 heat emitter

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