Rollover image above to zoom

2-Stage Heating 2-Stage Cooling Programmable Thermostat Temperature and Humidification / Dehumidific

Price: $226.76
Excl. Shipping
SKU: THE9870
(See Product Details Below for Manufacturers Part Numbers)
Discount Shipping

Our volume UPS discounts are passed-on directly to you for the lowest possible shipping rates.

Comfort Made Easy Menu Driven Display

2 Heat / 2 Cool

Complete Temperature and Humidification / Dehumidification Control

•ve combined humidity and temperature control in one
easy-to-install, easy-to-program package.

This versatile thermostat provides control over both humidification and dehumidification. Your
customers will enjoy the maximum comfort and energy savings, and
you will benefit from the time and effort saved by installing a single
device that does the work of two.

Our 9870i thermostat combines all the award winning features of our
9700i series thermostats with the convenience of humidity control.

When used in conjunction with our 9025i outdoor sensor, the 9870i
minimizes condensation and maintains optimal comfort.

•ve even added a calibration feature to fine tune the thermostat to the
individual's unique environment.

The 9870i is compatible with most standard 24 Volt AC heat pump
systems, up to two stage heat and two stage cool. We took the guess
work out and put simplicity in. It
•s programming made easy.

Integrated Humidity Sensing
• Automatically adjusts indoor
humidity levels, prevents condensation and maintains desired
comfort level.

Worry-Free Memory Storage
• Even during power outages, the
thermostat maintains setpoint and programmed parameters.

Fully Programmable
• 7 day, 5/2, 5/1/1 or 24 hour programming menus.

Adjustable Events Per Day
• 2, 4 or 6 events per day for greater
control of your customer
•s comfort.

High/Low Balance Point Control
• When connected to the outdoor
sensor, model 9025i, the thermostat can automatically control first
and second stage activities with adjustable set points.

Selectable 2nd Stage Heating (Fossil Fuel Kit)
• Choose internal
auxiliary or a remote heating system.

Adjustable 1st and 2nd Stage Differential
• Maintains optimal
customer comfort.

Adjustable Timed Upstaging
• Helps maintain optimal temperature
or energy savings.

Remote Indoor and Outdoor Sensor Capable
• For greater control of
indoor comfort and system efficiency.

EERTM (Energy Efficient Recovery)
• Increases energy savings. EERTM
allows gradual recovery from setback temperature to minimize use of
auxiliary systems.


Electrical rating: 24 Volt AC (18-30 VAC)

1 amp maximum load per terminal (relay outputs)

4 amp total maximum load (all terminals combined)

Temperature control range: 45
•- 90
•F (7
•- 32

Accuracy: +/-1.0
•F (+/-0.5

Power Source: 24 VAC

Auto Changeover deadband: Selectable 2
• to 8

Temporary temperature override: 3 hour maximum or next setpoint

Remote sensor capable: 1 indoor and 1 outdoor sensor

System configurations: Multi-stage heat pumps

Terminations: R, E, Y1, B, W2, Y2, L, O, G, C, IS, OS, H

Replaces Thermostat Part Numbers:


I called trying to find out what happened to the rest of my order and was surprised to hear a warm and kind voice willing to do whatever it takes to find answers and follow through with her promise. Amanda is an asset worth holding on to and a credit to your company. She was very professional, helpful and courteous while assisting me with my order. I would most definitely assign her an A+ in customer service."
Donald "Brad" Thomas

I would like to thank you for your hard work in getting us our part in a timely fashion. You were very helpful and you understood the severity of the situation and did a wonderful job in getting the part to us. Thanks again and please share this with your boss! You were outstanding!"
Todd Mills

Share This:
Have Questions?
Our parts Experts are happy to help!

Available Monday to Friday 10am - 6:30pm EST
Email our Parts Experts
Accredited BusinessGo
Amanda I want to thank you, the blower fan work perfectly. Thank you so very much."
Bill K Roberts
Amanda, Thank you very much again, I have been looking for this part for about two weeks and getting very frustrated in the process of the search, you were very helpful!!"
Ken Holm
Why Buy From Us?
110% Lowest Price Guarantee
Over 500,000 Parts in Stock
Same Day Shipping on Orders Received Before 3pm EST (Mon-Fri)
Nationwide Distribution Centers for Fast Delivery
Choose from UPS Next-Day, 2-Day, 3-Day and Ground Service
We Supply Retail and Wholesale
Order from us.
Risk Free, with
Our Triple Guarantee
Guarantee 1
No hassle, 30-day returns policy
Guarantee 2
110% Lowest price guarantee
Guarantee 3
90-day warranty
Sign up for Special Offers Directly from | 1042 N. Mountain Ave., #B546 | Upland, CA 91786
© 2003-2018 All Rights Reserved.