Install Manual

04/03/2009 16 EI204

Additional Applications

Furnace variable speed blower – (Figure 12) a

fifth wire connection will be needed to speed up

the gas furnace blower for air conditioning and

HeatChoice electric heating operation. Add the

fifth wire to the gas furnace “Y” terminal as

shown on the diagram.

Note: Connection wires shown are in addition to

4-wire thermostat and 4 wires to furnace.

Note: In the latest version of the HeatChoice,

external jumper wires are no longer needed to

ramp up the blower for air conditioning and

HeatChoice electic heating.

AUX Load Control, other Electro products – on HeatChoice control board, bottom right, connect blues (from

other product) to COM and EL. (Note: this is a true function from the blue wires, it does not follow the override

switch).

2-stage or variable burner gas – most furnaces ignore or do not take W2 (or Ruud “V”) action unless there is

an input to W1. This means you can take a wire directly from 2-stage heat roomstat W2 to the furnace W2 and

until the system is switched over to standby with the HeatChoice control board activating W1 there should be no

furnace action.

2-speed or 2-stage air conditioning – load control

action may be required with the outdoor unit Y2. This

can be accomplished by routing the roomstat Y2

through a relay contact (onboard tabs) and the outdoor

unit Y2.

- Roomstat Y2 – COM

- EL – outdoor unit Y2

Wood furnace – inlet air sensor required, must order

and install EM5713 sensor for all non-automatic

standby applications. The heated air coming off of the

wood furnace must be less than about 90° before the

electric elements will activate. Install the EM5713 in

series with the load management control blue wire

(Figure 13).

Large mass furnace heat exchanger, oil, etc. – if there was an active standby heat call during the release of a

load control back to electric, the heat build-up within the heat exchanger and the heating up of electric elements

may initially produce an output temperature which exceeds the manual reset (250°). Normal tubular gas furnace

heat exchanger should not be a problem because the electric element initial temperature delay is approximately 3

minutes. By removing the XD jumper on the HeatChoice control board, a two minute delay is added between

each stage 2, 4, and 5. This will help reduce the chances of experiencing nuisance tripping of the manual reset

limit switch.

ure 12

ure 13