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6. Multi-Stage System Operation
The relays that will operate the existing fossil fuel furnace and A/C
to provide 2
nd
stage heating and/or cooling are already installed in
the Well-Connect control box. Simply remove the front service
panel of the Well-Connect, and just to the left of the control box you
will see a small white terminal strip (next to the black hour meter)
with four wire terminals marked R-W-G-Y. (Figure 7)
Figure 7
Run a piece of 18 AWG thermostat wire between the Well-Connect
and the existing furnace. For 2-stage heating only you will need just
2 conductors. If you want 2-stage heating and 2-stage cooling you
will need a total of 4 conductors. Connect separate conductors from
the terminals on the Well-Connect strip to the matching terminals
on the furnace low voltage terminal strip (where the furnace
thermostat wires are connected). For 2-stage heating only connect
just the R and W terminals. For 2-stage cooling only connect the R
,G and Y terminals. For both 2-stage heating and 2-stage cooling
you must connect all 4 terminals.
If the low voltage terminal strip in the existing furnace has W1 and
W2 terminals, or Y1 and Y2 terminals, use only the W1 and Y1
terminals for the connections to the Well-Connect.
Do not remove any existing wires from the terminal strip in the furnace.
It is OK to
have 2 low voltage wires on the same
terminal, allowing the existing thermostat to
operate the existing furnace and/or air-conditioner if needed.
