Specifications

29
RG SERIES ENGINEERING GUIDE
Installation Notes
Typical Unit Installation
Unit Location
Locate the unit in an indoor area that allows for easy removal of
the filter and access panels. Location should have enough space
for service personnel to perform maintenance or repair. Provide
sufficient room to make water, electrical and duct connection(s). If
the unit is located in a confined space, such as a closet, provisions
must be made for return air to freely enter the space by means
of a louvered door, etc. Any access panel screws that would be
difficult to remove after the unit is installed should be removed
prior to setting the unit. On horizontal units, allow adequate room
below the unit for a condensate drain trap and do not locate the unit
above supply piping. Care should be taken when units are located
in unconditioned spaces to prevent damage from frozen water lines
and excessive heat that could damage electrical components.
Water Piping
Piping is usually design as ‘reverse return’ to equalize flow paths
through each unit. A short flexible pressure rated hose is used to
make connection to the fixed building piping system. This hose
is typically stainless steel braid and includes a swivel fitting on
one end for easy removal and is flexible to help isolate the unit
for quieter operation. Isolation valves for servicing, y-strainers for
filtering and memory-stop flow valve or a balancing valve can be
provided for consistent water flow through the unit.
All unit source water connections are fittings that accept a male
pipe thread (MPT). Insert the connectors by hand, then tighten
the fitting with a wrench to provide a leakproof joint. The open and
closed loop piping system should include pressure/temperature
ports for serviceability. The proper water flow must be provided
to each unit whenever 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 connections
on the unit. The proper flow rate cannot be accurately set without
measuring the water pressure drop through the refrigerant-to-water
heat exchanger. Never use flexible hoses smaller than the inside
diameter of the water connection at the unit. Limit hose length to 10
feet per connection. Check carefully for water leaks.