Application Guidelines

ICP Inverter System Matching
This heat pump unit provides the most customer benefit and highest efficiency when
installed as a complete Observer
®
Communicating system including Observer
Control. Acceptable system combinations will be listed in the AHRI directory and in the
online ratings database, accessible through the Go websites.
For increased system flexibility, and increased replacement opportunities, this outdoor
unit is also designed to work with standard non-communicating thermostat inputs.
Combination ratings are available with some non-communicating 2-stage indoor units
such as the FVM4 fan coil. When utilizing this type of indoor unit, a standard 2-stage
thermostat is required, and the system will operate with 2-stage functionality.
Compatibility with existing indoor equipment (also see attached flowchart)
Because this unit is designed to work with communicating or standard thermostat
inputs, it opens up opportunities for replacement applications. However, the indoor
components must be of suitable size and configuration.
Existing Observer
®
communicating indoor equipment
The ICP Inverter products are backward compatible with all Observer
communicating indoor equipment. However, the non-WiFi
®
Observer wall control
is not compatible with the inverter unit in communicating mode. The software in
the non-WiFi Observer will not recognize the outdoor unit, and cannot be
upgraded in the field.
A software update to the WiFi Observer control to version 5.0 is planned for
August 2015 to add inverter unit functionality. WiFi Observer controls built before
this date may be upgraded in the field to version 5.0 software or newer in order to
be use with an inverter outdoor unit.
For full system capability with older indoor Observer-capable equipment, the wall
control must be upgraded to the Observer control with appropriate software.
Observer Model
Compatible with Inverter
Upgradable in the Field
TSTAT0201CW
Yes, with software
version 5.0 or newer
Yes
TSTAT0101SC
No – replace with current
version
No
Check ratings for system matches with FCM4 fan coil. These ratings can be
applied to old and new FCM4 fan coils units.
NOTE: The 2 and 3 ton ICP inverter models are NOT compatible with the
FCM4X60 fan coil due to the large size of the indoor coil.