EWT-955WH
Installation Manual
Thermostat Application Guide
Description
Gas or Oil Heat
Electric Furnace
Heat Pump (No Aux. or Emergency Heat)
Heat Pump (With Aux. or Emergency Heat)
Multi-Stage Systems
Heat Only Systems
Cool Only Systems
Millivolt
Yes
Yes
Yes
Yes
Yes
No
Power Type
Battery Power*
Hardwire (Common Wire)
Hardwire (Common Wire) with
Battery Backup
Table of Contents
Wireless Type Selection
Installation Tips
Thermostat Quick Reference
Private Label Badge
Wireless Communication Tips
Reestablishing Communication
Wiring
Technician Setup Menu
Setting the Humidity
Programming
Specifications
Page
A trained, experienced
technician must install this
product.
Carefully read these
instructions. You could damage
this product or cause a
hazardous condition if you fail
to follow these instructions.
Una version en español de este
manual se puede descargar en
la pagina web de la compañia.
Rev. 1841
U.S. Registered Trademark. Patents pending
Copyright 2018 All Rights Reserved.
3-8
13
2
Yes
Yes
14-18
Wireless Type Selection
Installation Tips
The thermostat should be installed approximately 4 to 5 feet above the
floor. Select an area with average temperature and good air circulation.
• Close to hot or cold air ducts
• That are in direct sunlight
• With an outside wall behind the thermostat
• In areas that do not require conditioning
• Where there are dead spots or drafts (in corners or behind doors)
• Where there might be concealed chimneys or pipes
Wall Locations
Pick an installation location that is easy for the user to access. The temperature
of the location should be representative of the building.
Installation Tip
Do not install thermostat in these locations:
Installation Tips
19-28
29
11
9-10
The thermostat and base module contain selectable wireless
communication options. Each component has a jumper switch label
FSK and ASK. Default setting: FSK.
• All components must be set to the same position for wireless
communication.
• Both modes utilize a 916 MHz frequency.
• FSK: frequency-shift keying, is the recommended mode.
• ASK: amplitude-shift keying, should be selected when using
components that can not communicate with FSK.
The images below illustrate the location of jumper switches for each
item that has one. Note only the thermostat and Base Module are
included in this package.
Back
FSK/ASK Switch
Back
FSK/ASK Switch
T955WH
RZ250W
The table below lists the mode options for T955WH
wireless thermostat and its accessories.
*Compatible with Z955W - Wireless Zoning Controller
Component
Mode Options
T955WH Thermostat
T955WH Thermostat Base Module
RZ251W - Indoor Remote*
RZ250W - Outdoor Remote*
R251W - Indoor Remote
R250W - Outdoor Remote
W150W - Wireless Repeater
FSK or ASK
FSK or ASK
FSK or ASK
FSK or ASK
ASK
ASK
ASK
Vertical Mount
Horizontal Mount
For horizontal mount put one screw on
the left and one screw on the right.
All of our products are mercury free. However, if the product you are
replacing contains mercury, dispose of it properly. Your local waste
management authority can give you instructions on recycling and
proper disposal.
Mercury Notice
Failure to disconnect the power before beginning to install this product
can cause electrical shock or equipment damage.
Installation Tip: Electrical Hazard
For vertical mount put one screw on
the top and one screw on the bottom.
Thermostat Subbase Installation
12
30-38
39
Humidity
Dual Fuel
Yes
Yes
* If you are using remote
sensors the thermostat
must be hardwired.
C
R
FSK / ASK
RESET
+
C
R
FSK/ASK
+
B1
ASK/FS
K
RZ251W
A
SK
/F
SK
RE
SET
IM
S
A
SK
F
SK
A
SK
FS
K
JP1
JP
3
ASK/FSK
BASE MODULE
ASK/FSK
c
o
