general
Installation information
General
The midrange models SCWH/SCRH is a high efficiency, vertical air condioner. units have either front or top discharge configuration options and easy service access. Unit construction is heavy gage steel with a baked enamel finish. Available unit voltages are 208/3/60, 230/ 3/60, 460/3/60, and 575/3/60.
Refrigeration Circuits
Units are configured in single or double refrigeration circuits. Each circuit consists of:
•high efficiency scroll compressor mounted on rubber isolation grommets
•evaporator coils designed for optimum performance and efficiency with lanced fins and rifled tubing
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Evaporator Section
The evaporator fan section consists of one or two forward curved centrifugal fans powered by a premium efficiency motor through an adjustable motor sheave and fixed diameter blower pulley.
Controls
The standard control panel consists of a high voltage terminal block, overload relays for each fan motor, transformer, 3- pole
Field-Installed Accesories
These items ship separately for field installation:
•steam coil
•hot water coil
•plenum
•oversized motors
•remote thermostat
Note: Application of the above options and/or accessories may require field adjustment of fan speeds to ensure proper airflow and performance.
Unit Nameplate
The unit nameplate identifies the unit model number, appropriate service literature, and wiring diagrm numbers. It is mounted on the control panel door. Reference this information when making inquires or ordering parts or literature.
Refrigerant Handling
Procedures
Environmental Accountability Policy Trane urges that all HVAC servicers to make every effort to eliminate, if possible, or vigorously reduce the emission of CFC, HCFC, and HFC refrigerants to the atmosphere. Always act in a responsible manner to conserve refrigerants for continued usage even when acceptable alternatives are available.
Recover and Recycle Refrigerants Never release refrigerant to the atmosphere! Always recover and/or recycle refrigerant for reuse, reprocessing (reclaimed), or properly dispose if removing from equipment. Always determine the recycle or reclaim requirements of the refrigerant before beginning the recovery procedure. Obtain a chemical analysis of the refrigerant if necessary. Questions about recovered refrigerant and acceptable refrigerant quality standards are addressed in ARI Standard 700.
Refrigerant Handling and Safety Consult the manufacturer’s material safety data sheet (MSDS) for information on refrigerant handling to fully understand health, safety, storage, handling, and disposal requirements. Use the approved containment vessels and refer to appropriate safety standards. Comply with all applicable transportation standards when shipping refrigerant containers.
Service Equipment and Procedures
To minimize refrigerant emissions while recovering refrigerant, use the manufacturer’s recommended recycling equipment per the MSDS. Use equipment and methods which will pull the lowest possible system vacuum while recovering and condensing refrigerant. Equipment capable of pulling a vacuum of less than 1,000 microns of mercury is recommended.
Do not open the unit to the atmosphere for service work until refrigerant is fully removed/recovered. When
12)or any other
refrigerants as a trace gas. Perform evacuation prior to charging with a vacuum pump capable of pulling a vacuum of 1,000 microns of mercury or less. Let the unit stand for 12 hours and with the vacuum not rising above 2,500 microns of mercury.
A rise above 2,500 microns of mercury indicates a leak test is required to locate and repair any leaks. A leak test is required on any repaired area.
Charge refrigerant into the equipment only after equipment does not leak or contain moisture. Reference proper refrigerant charge requirements in the maintenance section of this manual to ensure efficient machine operation. When charging is complete, purge or drain charging lines into an approved refrigerant container. Seal all used refrigerant containers with approved closure devices to prevent unused refrigerant from escaping to the atmo- sphere. Take extra care to properly maintain all service equipment directly supporting refrigerant service work such as gauges, hoses, vacuum pumps, and recycling equipment .
When cleaning system components or parts, avoid using
Keep abreast of unit enhancements, conversion refrigerants, compatible parts, and manufacturer’s recommenda- tions that will reduce refrigerant emis- sions and increase equipment operating efficiencies.
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