7.5.7
Connecting the outdoor unit bus
1. Connect the outdoor unit bus to the X23 connector in the indoor
module's EHC–04 central unit PCB.
2. Position the SW8–3 switch (except with the AWHP 4.5 MR) for the
outdoor unit PCB to ON.
7.5.8
Connecting the outside sensor
1. Connect the outside sensor to the Tout input on the X28 connector
on the indoor module's EHC–04 central unit PCB.
Important
Use a cable with a minimum cross-section of 2x0.35 mm
2
.
7.5.9
Connecting the hydraulic back-up.
1. Connect the back-up boiler pump (live / neutral / earth) to the X4
connector on the EHC–04 central unit PCB in the indoor module.
2. Connect the dry ON/OFF contact in the back-up boiler to the X5 con
nector in the EHC–04 central unit PCB in the indoor module.
Fig.62
MW-3000588-01
N
L
S1 S2S3
S2
S3
X23
S2
S3
S3
X23
2
S
1
3
1 2
SW8
2
Fig.63
Connecting the outside sensor
MW-3000513-01
X28
X28
1
1
7 Installation
58
AWHP-2 iMPI
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