Siemens EcoView Installation Instructions Manual page 7

Installation Notes:
Heat Pump HVAC System
To set the HVAC system type, go to the Thermostat Info
screen and press the Setup button.
1. Type: Set the HVAC System Type to Heat Pump.
2. Fan Type: Automatically set for heat pump systems.
Ignore this setting.
3. C/O Type: Change Over (reversing) Valve Type. Heat pumps
change from heating to cooling by reversing operation. You
must configure the thermostat's changeover valve setting to
work correctly with your HVAC system. Check your
system information to be sure, and note the color of the
original thermostat wire and the terminal it was connected
to. Regardless of the old stat connection (O or B), connect
the wire to the thermostat's W2/O terminal.
The C/O Type sets the correct system operation.
Siemens Industry, Inc.
Figure 5. Heat Pump Wiring.
For changeover with cool systems (orange wire, O terminal):
set C/O Type to w/cool (most common and default setting).
For changeover with heat systems (brown wire, B
terminal): set C/O Type to w/heat.
4. Second Stage Heat. Enable second stage heating outputs.
• If you have a single-stage heating system, leave this set to N.
• If you have a 2-stage heating system, set to Y to enable.
5. Aux Heat (HP). If you have auxiliary heat strips, set this to Y to enable.
6. Second Stage Cool. Enable second stage cooling outputs.
• If you have a single-stage heating system, leave this set to N.
• If you have a 2-stage heating system, set to Y to enable.
NOTE:
Document No. 129-566
Installation Instructions
If cooling results when you expect heating, switch
the C/O Type to the opposite setting.
November 14, 2014
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