Emerson UP400 User's Guide download pdf (Page 18)

Appendix: Heat Pump

Identiﬁ cation

1. How do I know if I have a Heat Pump?

2. How do I know if I should select

On1 or On2 for my Heat Pump?

• Check the documentation for your heating and cooling system or

contact your HVAC contractor.

• Conﬁ rm that you have a Heat Pump by checking the labels of the

wires coming out from the wall (labels you attached according to the

right-hand column of the 2.2.2 table).

• The labeled thermostat wires coming out of the wall indicate whether

you have a

1-stage or 2-stage Heat Pump.

According to the right-hand column

of the 2.2.2 table, if you have:

According to the right-hand column

of the 2.2.2 table, if you have:

An “O” wire, or a “B” wire

One “Y” wire coming from the wall

One “Y” wire and one “Y2” wire

coming from the wall

You have:

A Heat Pump

1-stage Heat Pump, select On1

2-stage Heat Pump, select On2

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Emerson UP400 User's Guide Page 18