Technical Specifications

Heat Rejection
115
6.10 Mounting the Drycooler
The drycooler must be installed so that it is level within 1/2" (13mm) to ensure proper glycol flow,
venting and drainage. For roof installation, mount the drycooler on suitable curbs or other supports;
follow all local and national codes. Secure the legs to the mounting surface using a field-supplied 1/2"
(13mm) diameter bolt in each of the two 9/16" (14mm) holes in each leg. See Figure 111 for anchor
dimensions.
6.11 Glycol Piping
NOTICE
Risk of excessive coolant fluid pressure, improper piping material, and unsupported piping.
Can cause piping rupture, coolant fluid leaks and building and/or equipment damage.
To avoid the possibility of burst pipes, the system installer must supply and install a relief
valve in the system. Galvanized pipe must not be used in glycol systems. To help prevent
piping failures, supply and return lines must be supported such that their weight does not
bear on the piping of the unit or pumps.
6.11.1 Piping Guidelines
Piping between the drycooler, the pump and the indoor unit is required to complete the system and is
to be provided and installed by the system installer. All fluid piping must comply with local codes.
Properly sized pipes will help reduce pumping power and operating costs.
Pipe material choices are typically copper, plastic or steel/black iron. Consult glycol and pipe
manufacturing literature for compatibility and sizing assistance. Galvanized piping should not be
used. Any copper piping installed should be “L” or “K” refrigerant grade copper.
See Figure 110 for a typical piping diagram, depicting multiple indoor units, multiple drycoolers and
dual pumps. Single indoor unit/pump/drycooler systems are also possible.
Drycooler supply and return connections vary in size and number. Refer to Table 46. Emerson
recommends installing manual service shutoff valves at the supply and return connections of each
drycooler and indoor cooling unit. The shutoff valves permit isolating equipment for routine
maintenance and for repairs.
Multiple pump packages require a check valve at the discharge of each pump to prevent back-flow
through the standby pump(s). To extend the service life of the drycooler and the system's pumps,
install filters/strainers in the supply line to the pumps. These filters should have a 16-20 mesh screen
and be a type that can be easily replaced or cleaned.
Installing hose bibs at the lowest point of the system will facilitate filling.
Keep piping runs as straight as possible; avoid unnecessary bends and minimize additional fittings.
Allow for pipe expansion from warm fluids. Piping should be isolated from the building with
vibration-isolating supports. Use soft, flexible material to seal between pipes and wall openings to
prevent pipe damage.
Consideration of the minimum glycol temperature to be supplied from the drycooler and the pipe
routing will determine if the glycol supply and return lines should be insulated. Insulation will
prevent condensation on the glycol lines in low ambient conditions.
Completed piping system should provide maximum leak-prevention. Welded or high-temperature
soldered joints should be used where possible. Threaded pipe joints, if needed, can be made with
tightly drawn Teflon
™
tape.
Clean and prepare all pipe connections before joining. Be careful not to allow solder/joining debris to
get inside the lines during the connection process.
!
CAUTION
Risk of explosive discharge of high pressure gas and flying projectiles. Can cause building
and/or piping damage and personal injury.
Units are shipped from the factory with a pressurized dry nitrogen holding charge. Carefully
relieve the pressure before cutting into the piping system.