Operating instructions

12/23/2011 11 EI711A
WarmFlo Select, TB3 Connection
The WarmFlo Select control board must have specific wired connections to the gas furnace and outdoor
unit. This hookup wiring takes place on the left center of the control board, hinged door open. See
drawing EH711.
Gas furnace terminal strip – using a 4-wire t-stat cable (three used) connect as follows:
WarmFlo Select Gas Furnace Wire Color
R (TB3-1) 24VAC, hot – R
C (TB3-3) 24VDC and ground – C*
G tab Furnace – G
* It is assumed the internal furnace wiring has common or C properly grounded. WarmFlo Select
control board will function the best when common as a proper static ground.
Heat pump, outdoor unit – using a 4-wire t-stat cable (three used) connect as follows:
WarmFlo Select Heat Pump Wire Color 286ANA
(Carrier 25HNA6)
265ANA/263ANA
(Carrier 25HPA5/25HPA3)
W (TB3-2) Y1 screw Y1 LS
INT (TB3-4) Y2 screw Y2 UTL
RV (TB3-6) O screw O O
Staging load shed – this does not apply to this model.
Additional Hookup or Special System Equipment Concerns
Forced Air Zone Controller
Because of WarmFlo temperature sensing, zone systems work very well and can be effective with this
WarmFlo Select. Basic suggestions:
1. Dampers must be in the distribution duct, not in the plenum with this WarmFlo Select.
2. Strongly suggest the damper motors be wired normally open (NO).
3. Use Zone Controller ____________________
Remotely Located Standby Override Switch
On the bottom of the board is an “SB SW” tab. Using an external switch between this “SB SW” tab and a
common tab provides the same function as the front override switch. Whichever switch is in the up or
override position takes priority. In other words, they both need to be in the down position during
cooling.
Note: All override switches (front panel and any options) must be in normal or electric position
during cooling.
Load Control, Other Products or Hardware
If there is a need to “pass on” the utility load control receiver function to other heating equipment, radiant
floor boiler, peak interrupter, etc; there is an isolated contact on this control board. Locate tabs
COM/EL/SB. In the electric mode there is an isolated contact between COM and EL. This contact is for
low voltage only, 1-amp maximum.
Note: There may be a 1 or 2 minute delay between this relay contact action and the actual load
control receiver. This delay coincides with various blower purge functions.
Note: This contact also follows front panel standby switch and all other standby functions such as
SOT-S, etc.