Specifications

7
ENVISION COMMERCIAL SPECIFICATION CATALOG
Duct humidity sensor – An optional duct humidity sen-
sor is installed. The FX10 control reads the humidity from
the sensor and determines operation mode. Setpoint and
deadband are internally set by the FX10 control and are
adjustable. Continuous blower operation is a requirement
for this mode to accurately measure relative humidity dur-
ing the off cycle.
Room wall humidity sensor – An optional wall humidity
sensor is installed. The FX10 control reads the humidity
from the sensor and determines operation mode. Set-
point and deadband are internally set by the FX10 control
and are adjustable. Continuous blower operation is NOT a
requirement for this mode.
Hot Gas Bypass
The hot gas bypass (HGB) option is designed to limit the
minimum evaporating pressure in the cooling mode to pre-
vent the air coil from icing. The HGB valve senses pressure
at the outlet of the evaporator by an external equalizer.
If the evaporator pressure decreases to 115 psig the HGB
valve will begin to open and bypass hot discharge gas in
the inlet of the evaporator. The valve will continue to open
as needed until it reaches its maximum capacity. Upon
a raising of suction pressure the valve will begin to close
back off and normal cooling operation will resume.
Flexible Control Options
The standard Premier microprocessor control board pro-
vides complete monitoring and control with fault, status
and I/O LED indication for easy servicing. The Premier
features a robust microprocessor control that monitors LP,
HP, Condensate, field selectable thermistor freeze detec-
tion, while providing a flexible accessory relay and fault
output scheme.
The optional FX10 control provides unparalleled capability
in several areas including performance monitoring, zoning,
humidity, energy management, and service diagnosis, and
then communicates it all thru standard DDC protocols like
N2, Lon and BACnet (MS/TP @ 19,200 Baud rate).
The most unique feature is integrating the FX10 into the
Envision series as both the heat pump and DDC controller
providing both a cost advantage and features not typi-
cally found on WLHP controls. This integration allows heat
pump monitoring sensors, status and service diagnosis
faults to be communicated thru the DDC direct to the
building automation system (BAS), giving building supervi-
sors detailed and accurate information on every piece of
equipment without removing an access panel!
Easy Maintenance and Service Advantages
3 removable compressor access panels•
Separate air handler and compressor section access •
panels permit service testing without bypass.
Designed for front panel access.•
LED Fault and status lights (Premier control)•
Removable low voltage connector for easy thermostat •
wiring.
Quick attach wiring harnesses are used throughout for •
fast servicing.
High and low pressure refrigerant service ports.•
Internal drop out blowers (vertical) and access panel •
view of all blower motors (horizontal).
Optional user interface for diagnostics & commissioning of
FX controls.
Internally Mounted Solenoid Valve Option (Special)
When variable speed circulating pump systems are de-
signed, low pressure drop (high Cv) solenoid valves are
specified at each unit to vary the pump according to flow
required. It is important that these valves be low pressure
drop to avoid unwanted pump watts. This option factory
installs this valve inside the unit. This can be ordered only
as a special.
Internally Mounted Pump Option (Special)
When load match or primary/secondary pumping systems
are designed, low wattage pumps are specified at each
unit to overcome the pressure drop of the unit water heat
exchanger and produce the required unit water flow into
the primary loop. It is important that these pumps be low
wattage to avoid unwanted pump watts. This option fac-
tory installs this pump inside the unit complete with opera-
tional controls. This can be ordered only as a special.
The Envision Series cont.
Premier FX10