Mitsubishi Electric PAAA18AA1 Installation Manual page 81

Terminal block pins (out)
To Furnace
A
01 02 03 04 05 06 07 08 09 10 11 12 01 02 03 04 05 06 07 08 09 10 11 12
To MA
Controller
B
Pin Signal
1B MA communication bus M1.
Wire color: white
2B MA communication bus M2.
Wire color: blue
3 A/B Unused
4 A/B Unused
5A Signal C to furnace (24VAC return).
Wire color: light blue, cyan or black
6A Signal C to furnace (24VAC return).
Wire color: light blue, cyan or black
7A Signal R to furnace (24VAC hot).
Wire color: red
8A Signal R to furnace (24VAC hot).
Wire color: red
9A Signal Y/Y2 to signal Y (wire color:
yellow) of furnace on 1‑speed fan
or to signal Y2 (wire color: blue) of
furnace on 2‑speed fan.
10A Signal W1 to furnace (first stage of
heating). Wire color: white
11A Signal W2 to furnace (second stage
of heating). Wire color: brown
Specifications are subject to change without notice.
PAA-A18, 24, 30, 36, 42AA1/BA1/CA1
13 14 15 16 17 18 19 20 21 22 23 24 13 14 15 16 17 18 19 20 21 22 23 24
TB-A
Circuit Boards
FRONT OF CONTROL BOX
Factory Connec�on Within Control Box. DO NOT ALTER. Factory Connec�on Within Control Box. DO NOT ALTER
Pin
13A
14A
15A
16A
17A
18A
19A
20
A/B
21
A/B
22
A/B
23B
81
To TH01
S1 S1 S2 S2 S3 S3
TB-B
TB-C
B
Signal
Unused
Signal R to non-adjustable thermo-
stat (NAT) (24 VAC hot)
Wire color: red
Unused
Unused
Signal W2 to optional connection
to NAT (may be connected to W1
to turn on both stages of furnace
when requested by the NAT) (sec-
ond stage of heating). Wire color:
brown
Signal W1 to NAT (first stage of
heating). Wire color: white
Unused
Unused
Unused
Unused
RTN (return air temperature sen-
sor). Wire color: white
© 2022 Mitsubishi Electric US, Inc.
A
To
Outdoor
Unit