Installation Instructions
540-204
Installations Instructions
Rev. 2, 1/99
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Siemens Building Technologies, Inc.
Landis Division
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The Heat Pump Controller – Multi-Stage controls 24 Vac loads only. The maximum rating is 12 VA
for each DO. For higher VA requirements, 110 or 220 Vac requirements, separate transformers
used to power the load, or DC power requirements, use an interposing 220 V 4-relay module
(TEC Relay Module P/N 540-147).
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: Refer to the unit wiring diagrams or consult with the local representative if terminations are missing or are
different.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Y1 G
Y2
COM
CW
CCW
- OR -
DAMPER
ACTUATOR
(P/N SQR81.1)
G = COMMON
(OPTIONAL)
DAMPER
ACTUATOR
(P/N 349-0100)
(OPTIONAL)
ROOM TEMPERATURE SENSOR
MIXED AIR TEMPERATURE SENSOR (OPTIONAL)
WALL SWITCH (OPTIONAL)
HEAT PUMP ALARM (OPTIONAL)
SPRING RETURN DAMPER MOTOR (OPTIONAL)
FAN
COMPRESSOR 2; OR,
3RD STAGE ELECTRIC HEAT (OPTIONAL)
COMPRESSOR 3; OR,
2ND STAGE ELECTRIC HEAT (OPTIONAL)
TEC2273WDR2
COMPRESSOR 1
REVERSING VALVE
1ST STAGE ELECTRIC HEAT (OPTIONAL)
24 V-AC
TX
RX
LAN
TRUNK
+ - S BST
RTS
DO 1
NO C
DO 2
NO C
DO 3
NO C
DO 4
NO C
DO 5
NO C
DO 6
NO C
DI 3
AI 3
DI 2
DI 4
AO 1
DO 7
NO C
DO 8
NO C
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
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