- W1: ON with call for first-stage heat or auxiliary/emergency heat
- W2: ON with call for second-stage heat
- Y1: On with call for first-stage cool or first-stage compressor
- Y2: ON with call for second-stage cool or second-stage compressor
- G: ON with call for fan
- OB: ON when reversing valve is energized
- O = reversing valve energized on a call for cooling
- B = reversing valve energized on a call for heating
AUXILIARY PANEL:
- Two iO-TWIN panels can be wired together to control up to four HVAC units. The auxiliary terminals on one panel wire to the thermostat terminals on the other.The auxiliary terminals ‘R’ and ‘C’ also provide power to the second panel. The sequence of operation remains the same whereby each HVAC unit’s fan and stages of heating and cooling will be energized at the same time based on the thermostat input.
iO HVAC Controls TWIN Series: The iO-TWIN-TR is our popular twinning kit with a transformer included. It is designed to allow a single thermostat to control two separate HVAC units. It can also be expanded to control a total of four HVAC units. The twinning kit can be used on common or separate ducted systems with single-stage, multi-stage and heat pump equipment. Only standard 18-gauge thermostat wire is required. Thermostats and HVAC units can be located up to 300’ from the twinning kit panel.
Related Units, Accessories, And OEM Replacement Parts
"We have been ordering parts from NorthStock and have been very pleased with the service. The availability shown on the website has always been actual in-stock items, product has always shipped as promised. Knowing you have a vendor you can depend on is key, NorthStock is our first point of contact. Customer service on a level that you do not see very often this day and age. Thanks NorthStock!"
CHRYSTAL FROM FLORIDA
"This company cares about their products but also cares about customer satisfaction. I will continue to order from them for all my needs."
pat from pennsylvania
“I ordered a part to be shipped to Arkansas. NorthStock had the best price that I could find. They shipped the part fast and it (fan motor) runs quieter than when new.”
tim from arkansas
“Excellent customer service and quicker than expected delivery of a hard to source part. Highly recommended.”
sean from massachusetts
“Had exactly what I needed in stock. Ordered on a Wednesday and it arrived Friday. Could not ask for better service. Fast Shipping and a very nice website!”
scott from maryland
“Fast shipping and excellent customer service. Will continue to do business with them.”
