Technical Specifications

Heat Rejection
116
6.11.2 Expansion Tanks, Fluid Relief Valves, Air Management and Other Devices
An expansion tank must be provided for expansion and contraction of the fluid due to temperature
change in this closed system. Vents are required at system high points to vent trapped air when
filling the system. A fluid pressure relief valve is also a necessary piping component.
All systems must have an air management system to ensure proper component operation and system
performance. There are several methods that can be used to manage the air within a closed loop
hydronic system. Depending on the method chosen, the system may include one or more of the
following ancillary components: tank-steel (expansion, compression, diaphragm or bladder), air
separator and air vent.
Consult your local engineer to determine which method will be used and where these components
must be installed.
Depending on the complexity of the system, various other devices may be specified—refer to
site-specific drawings. Some of the devices that may be required are: pressure gauges, flow switches,
automatic air separator, tempering valves, standby pumps and sensors for electrical controls.
NOTICE
Risk of frozen coolant fluid. Can cause piping rupture, coolant fluid leaks and building
damage.
Immediately following the use of water for leak testing or system cleaning, charge the tested
system with the proper percentage of glycol and water for your coldest design ambient.
Complete system drain-down cannot be ensured and damage to the system could result from
freezing of residual water.
6.12 Electrical Supply
Line voltage electrical service is required for all models. Refer to equipment nameplate regarding
wire size and circuit protection requirements. Electrical service must conform to national and local
electrical codes. Refer to electrical schematic when making connections.
Each unit is shipped from the factory with all internal unit wiring completed.
Each unit is shipped from the factory with all internal unit wiring completed. Refer to the electrical
schematic supplied with the drycooler when making line voltage supply, low voltage indoor unit
interlock and any low voltage alarm connections. All wiring must be done in accordance with all
applicable local, state and national electrical codes.
For electrical characteristics, refer to Table 47.
!
WARNING
Risk of electric shock. Can cause injury or death.
Disconnect all local and remote electrical power supplies before working within the electrical
enclosure.
The line side of the disconnect remains energized when the disconnect is Off.
Use a voltmeter to verify that the electrical power is Off before performing any electrical
and/or mechanical service and/or maintenance operations.
!
WARNING
Risk of high speed moving parts. Can cause injury or death.
The fan(s) blades can start to rotate unexpectedly when the power is On. Disconnect all local
and remote electrical power supplies before working within the fan compartment.
Use a voltmeter to verify that the electrical power is Off before performing any electrical
and/or mechanical service and/or maintenance operations.