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507827-01

Issue 1813

Page 1 of 4

Save these instructions for future reference

INSTALLATION INSTRUCTIONS

Twinning Kit 16W72

For Single and Two Stage Gas-Fired Furnaces with Constant 

Torque Blower Motors

This manual must be left with the homeowner for future reference.

This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in 

manuals, be alert to the potential for personal injury or death.

 

(P) 507827-01

*P507827-01*

 WARNING

Improper installation, adjustment, service, or maintenance 

can cause property damage, personal injury, or death. 

Consult a qualified installer, service agency, or the gas 

supplier for information or assistance.

 CAUTION

Label all wires prior to disconnection when servicing 

controls. Wiring errors can cause improper and 

dangerous operation.

 WARNING

Risk of electrical shock. Disconnect all 

remote power supplies before installing 

or servicing any portion of the system. 

Failure to disconnect power supplies can 

result in property damage, personal injury, 

or death.

Parts List

Quantity

Part

5

DPST Relay

30

.250 Quick Disconnect Terminal

10

Self-Tapping Screws

1

Installation Instructions

Application

This accessory kit is used to operate two gas-fired furnaces 

that are intended to be “twinned together,” meaning 

connected in a shared duct system controlled by a single 

thermostat.
•  Do not twin more than two furnaces at a time.
•  Must be installed and wired in accordance with local 

codes.

•  Used for single-stage heating/single-stage cooling 

with a single-stage thermostat.

•  Used for two-stage heating/single-stage cooling with 

either a single-stage or two-stage thermostat.

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