Auxiliary Chilled Water Coil Piping; Condensate Drain Piping; Humidifi Er Piping; Dry Steam Humidifi Er - Data Aire LCS Installation, Operation And Maintenance Manual

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 2.1.4. Units with an Energy Saver cooling coil typically 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 a reciprocating say with a metal cutting blade for larger pipes sizes or if there is a
clearance problem. All connections need to be cleaned before connections are brazed together.
2.4

Condensate Drain Piping

The evaporator section is equipped with a 3/4" FPT connection on the bottom 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 codes permit, PVC pipe 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
The optional humidifi er offered on LCSs 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 unit 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.
2.6 Dry Steam Humidifi er
Units with optional dry steam type humidifi ers require a strainer on the inlet steam line. An outlet
connection with fi eld provided steam trap is also required. Steam pressure is typically 10-15 psi.
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