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Installation and User Instructions
MODEL CA8900 Z-Wave
®
Digital Thermostat
The CA8900 is a digital thermostat that can be con-
trolled wirelessly with Z-Wave controllers supporting
the Thermostat General V2 Device Class. The thermo-
stat is compatible with all standard 24 VAC heating
and cooling systems, up to two-stage heat, one-stage
cool, and two-stage heat pump. The CA8900 operates
as a simple thermostat with buttons to set target tem-
peratures for heat and cool modes. The Save Energy
button adds two more modes for target temperatures
to provide a single button set-back mode for easy op-
eration. It can easily be retrofitted to existing systems
as part of a Z-wave control strategy.
The CA8900 Wireless Thermostat provides two-way
communication as part of a Z-Wave
®
network. When
it receives commands from the Central Controller
Unit, it sends back confirmation that the command
was received and imple-
mented. Each module in a
Z-Wave network communi-
cates with every other mod-
ule, acting as a “repeater”
and routing your commands
to their destination by the most reliable pathway.
When Z-Wave devices (regardless of manufacturer)
are installed throughout the house, signals are au-
tomatically routed around obstacles or dead spots,
strengthening the network as more devices are added.
The Z-Wave icon shows on the lower right of the dis-
play panel, indicating that the thermostat is in contact
with the controller. If the icon is not present, commu-
nication has been lost. If this occurs, all remote HVAC
functions are shut off.
Description and Features
This guide is in two parts:
Part One: Operating Guide • —
for the homeowner or end user.
Part Two Installing Guide • —
for the installer or technician.
This thermostat can be used with all 24VAC heat-•
ing and cooling systems. It cannot be used with line
voltage systems.
The CA8900 is digital and your desired heat or cool •
temperatures can easily be set on the large screen
with the TEMP UP (+) and TEMP DOWN (-) buttons
on the front.
A minimum 4-minute off time protects heating and •
cooling systems from damage.
This thermostat uses a new technique called sequen-•
tial staging for more comfort with faster reaction to
requested temperature changes.
NOTE: When using a heat pump with auxiliary
heat, if the heat pump cannot keep up and/or is
defective, remove jumper from position 2B and put
jumper on position 2A. This will make the auxiliary
heat your only source of heat. Be sure to restore it
to PUMP when the pump is again operational, as
auxiliary heat is more expensive than pump heat.
For more information, see page 3.