Specifications

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2.3 Auxiliary Chilled Water Coil Piping
Units with an Auxiliary Chilled Water cooling coil require a separate source of chilled water. These
chilled water connection sizes will be equal to the condenser water connection sizes on the chart in
Section 2.2.2. Units with an Energy Saver cooling coil have shared piping with the condenser supply
and therefore do not require a separate water source.
All chilled water pipes have a cap installed on the end of the pipe for pressure testing the system.
These caps need to be removed before installing the water piping to the unit. Use a tube cutter for
smaller pipes and reciprocating saw with a metal cutting blade for larger pipes or if there is a clearance
problem. All connections need to be cleaned before connections are brazed together.
2.4 Condensate Drain Piping
Every indoor unit has a 3/4” copper stub provided for condensate removal. A union is recommended
at the fi eld connection which will permit easy disconnection from the unit for cleaning.
A trap should be built into the drain line to prevent air from backing up into the unit. Drain lines
should be pitched downward not less than 1/4” for each ten feet of horizontal run. Do not reduce
the size of the drain line. Where local code permits, PVC pip may be used.
Some applications have no convenient means of allowing a gravity drain. In this case, a
condensate pump can be used. These come either factory mounted or shipped loose. Factory
mounted condensate pumps do not require a separate power source.
Condensate pumps shipped loose (or fi eld provided) typically require a dedicated 110 volt power
source. Field pipe connections must be made to the pump discharge connection. A check valve
must be installed to prevent short cycling. See also condensate pump electrical requirements in
Section 3.9.
2.5 Humidifi er Piping
2.5.1 Steam Generator Humidifi er
The standard humidifi er on Data Aire systems is a steam generator type with a disposable cylinder.
The humidifi er makeup water should be brought to the humidifi er through the fi eld connection opening
using 1/4” copper tubing. A compression fi tting is provided at the humidifi er.
A shutoff valve should be provided outside the air conditioner to allow disconnection for service.
An in-line water pressure regulator and strainer should be installed. Water pressure should be set
between 30 and 80 PSI.
The humidifi er has a drain at the bottom which is factory piped to the main condensate drain line.
The dispersion tube also has a drain line. No additional fi eld piping is required.
2.5.2 Dry Steam Humidifi er
The optional dry steam type humidifi er requires a strainer on the inlet steam line. An outlet
connection with a fi eld-provided steam trap is also required. Steam pressure is typically 10-15 psi.