Installation Procedures

1.Remove line power from both appliances before starting installation of the twinning kit.

2.Locate the Z1 and Z2 or C to C and H to H connections along one edge of each control (see Figure 1 and Figure 2). The designations are printed on top of the circuit board, and a black bar shows the correct orientation of the metal body which will be pushed in to make connection.

3.Remove furnace casing hole plugs and route the twinning leads through bushings provided as required, and lengthen if necessary by splicing. Be sure to observe the polarity required so as to match Z1 to Z1 and Z2 to Z2 or C to C and H to H (see Figure 3).

4.Push the terminal into the slot on the circuit board edge. Be sure to align the body with the black bar to line up the solder finger below the circuit board (see Figure 1). The terminal will “bite into” the solder and make the necessary connection. Repeat for each end of both wires.

5.Locate and mount the isolation relay in the circulating blower compartment on the same panel as the electronic fan control in furnace #1 (see Figure 1 and Figure 2).

6.Refer to single stage or two stage thermostat wiring as noted below.

“G” and “Y” connections only. Interconnect the wiring from the “C” connections at the terminal blocks on each fan control. Note: The “Y” connection is not required if air conditioning is not available.

2.Connect wire from “W1” of the thermostat to the “W” connection of the electronic fan control of furnace #1.

3.Connect wire from “W2” of the thermostat to one side of the 24Vac coil of the isolation relay (terminal #3). (Wire terminals for connection to the isolation relay are provided in the kit)

4.Connect wire from “R” connection at the thermostat to the “R” connection of the electronic fan control of furnace #1.

5.Connect wire from the “C” connection of the electronic fan control of furnace #1 to the other side of the 24Vac coil of the isolation relay (terminal #1).

6.Connect one wire to each of the normally open terminals of the isolation relay (terminal #2 and #4) and connect to the “R” and “W” connections at the electronic fan control of furnace #2.

7.Set the heat delay off timings on each control to the same setting.

8.Set thermostat anticipator setting at 0.75 for the 1st stage and 0.15 for the 2nd stage.

Single Stage Thermostat Operation

9.

Recheck wiring connections, splices, and insulation.

Reference Figure 6 and Figure 7

 

Re--apply line power to both appliances.

1.

Interconnect the thermostat wiring in parallel from the

Twinning Kit Operation

 

 

thermostat to the terminal blocks on each fan control, for the

1.

Turn the heat/cool switching at the thermostat to “OFF”, or

 

 

“G” and “Y” connections only. Interconnect the wiring from

 

 

the “C” connections at the terminal blocks on each fan

 

set so neither a call for heating nor cooling is being made.

 

 

control. Note: The “Y” connection is not required if air

2.

Turn the fan switch to “ON” from “AUTO”, or jumper from “R”

 

 

conditioning is not available.

 

 

 

to “G” at “furnace 1”. Within several seconds, the circulation

 

 

 

 

2.

Connect wire from “W” connection at the thermostat to the

 

blowers of each furnace will start at the same speed

 

 

“W” connection of the electronic fan control of furnace #1.

 

connected to their respective “heat” speed taps.

3.

Connect wire from “R” connection at the thermostat to the

3.

Turn the fan switch to “OFF” from “AUTO” or remove the

 

 

“R” connection of the electronic fan control of furnace #1.

 

jumper from “R” to “G”. Both circulation blowers will stop

4.

Connect wire from the “W” connection of the electronic fan

 

after several seconds.

 

 

 

 

 

control of furnace #1 to one side of the 24Vac coil of the

4.

Disconnect one wire from the high limit connection on

 

 

isolation relay (terminal #3). (Wire terminals for connection

 

“furnace 1”. Within several seconds, the circulation blowers

 

 

to the isolation relay are provided in the kit)

 

of each furnace will start at the same speed connected to

5.

Connect wire from the “C” connection of the electronic fan

 

their respective “heat” speed taps.

 

 

 

 

 

control of furnace #1 to the other side of the 24Vac coil of the

5.

Re--connect the wire removed from the high limit

 

 

isolation relay (terminal #1).

 

connection on “furnace 1”. After the completion of the

6.

Connect one wire to each of the normally open terminals of

 

heating “blower off” delay, both blowers will stop.

 

 

 

 

 

the isolation relay (terminals #2 and #4) and connect to the

6.

Repeat steps (4) and (5) with the limit connection in

 

 

“R” and “W” connections at the electronic fan control of

 

²

 

 

 

furnace #2.

 

“furnace 2” versus :furnace 1 . The same operation should

 

 

 

result.

7.

Set the heat delay off timings on each control to the same

7.

Operate the system through a normal call for heat, burner

 

 

setting.

 

on operation, and burner off operation. Each furnace

8.

Set thermostat anticipator setting at 0.90.

 

should fire and cycle both blowers, including blower on and

 

off delays, as in a normal single system.

 

 

 

 

9.

Recheck wiring connections, splices, and insulation.

8.

Operate the system through a normal call for cooling. The

 

 

Re--apply line power to both appliances.

 

 

 

compressor operation should function normally, with each

Two Stage Thermostat Operation

 

 

furnace circulation blower operating at the speeds

Reference Figure 6 and Figure 7

 

connected to their respective “cool” speed taps after

1.

Interconnect the thermostat wiring in parallel from the

 

cooling “blower on” delay. When the call for cooling ends,

 

the circulation blowers will stop upon the completion of the

 

 

thermostat to the terminal blocks on each fan control, for the

 

“cooling off” delay.

 

 

 

 

 

 

 

 

 

 

441 06 1003 02 (10/2001)

 

 

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Bryant NAHA003WK.01 installation instructions Single Stage Thermostat Operation
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NAHA003WK.01 specifications

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