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ENVISION CONSOLE INSTALLATION MANUAL
Safety Considerations
WARNING: Before performing service or main-
tenance operations on a system, turn off main
power switches to the indoor unit. If applicable,
turn off the accessory heater power switch. Elec-
trical shock could cause personal injury.
Installing and servicing heating and air conditioning
equipment can be hazardous due to system pressure and
electrical components. Only trained and qualified service
personnel should install, repair or service heating and air
conditioning equipment. Untrained personnel can perform
the basic maintenance functions of cleaning coils and clean-
ing and replacing filters. All other operations should be
performed by trained service personnel. When working on
heating and air conditioning equipment, observe precau-
tions in the literature, tags and labels attached to the unit
and other safety precautions that may apply.
Follow all safety codes. Wear safety glasses and work
gloves. Use a quenching cloth for brazing operations and
have a fire extinguisher available.
Moving and Storage
Move units in the normal “up” orientation. Do not stack
units. When the equipment is received, all items should be
carefully checked against the bill of lading to be sure all
crates and cartons have been received. Examine units for
shipping damage, removing the units from the packag-
ing if necessary. Units in question should also be internally
inspected. If any damage is noted, the carrier should make
the proper notation on the delivery receipt, acknowledging
the damage.
Water Piping
The proper water flow must be provided to each unit when-
ever the unit operates. To assure proper flow, use pressure/
temperature ports to determine the flow rate. These ports
should be located at the supply and return water connec-
tions on the unit. The proper flow rate cannot be accurately
set without measuring the water pressure drop through the
refrigerant-to-water heat exchanger.
All source water connections on commercial units are fit-
tings that accept a male pipe thread (MPT). Insert the con-
nectors by hand, then tighten the fitting with a wrench to
provide a leakproof joint. When connecting to an open loop
(groundwater) system, thread any copper MPT fitting into
the connector and tighten in the same manner as described
above.
Refrigerant Systems
To maintain sealed circuit integrity, do not install service
gauges unless unit opertion appears abnormal. Compare
the change in temperature on the air side as well as the wa-
ter side to the Unit Operating Parameters tables. If the unit’s
performance is not within the ranges listed, and the airflow
and water flow are known to be correct, gauges should
then be installed and superheat and subcooling numbers
calculated. If superheat and subcooling are outside recom-
mended ranges, an adjustment to therefrigerant charge may
be necessary.
General Installation Information