ENVISION CONSOLE INSTALLATION MANUAL
General Installation Information
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.
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.
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
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.
4
