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2.3 Auxiliary Chilled Water Coil Piping
Units with an optional Auxiliary Chilled Water cooling coil require a separate source of chilled water.
The chilled water connection sizes will be the same as those listed for the condenser water (see
chart in Section 2.2.3). Units with optional Energy Saver coil typically have shared or common pip-
ing with the condenser supply and therefore do not require a separate cooling source.
All 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 saw with a metal cutting blade for larger pipe sizes or if there is a clear-
ance problem. All connections need to be cleaned before connections are brazed together.
2.4 Condensate Drain Piping
The evaporator section is provided with a 3/4” FPT connection on the bottom for condensate re-
moval. Units with vertical air discharge have the 5” plenum below the evaporator drain pan with
knockouts that allow fi eld supplied ad installed condensate lines to be routed out either side. 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 10 feet of horizontal run. Do not reduce the
size of the drain line. Where local codes permit, PVC pipe may be used.
Some applications or installations have no convenient means of allowing a gravity drain. In this
case a condensate pump can be used. An optional condensate pump can be factory mounted and
wired or shipped loose for fi eld installation. Factory mounted pumps do not require a separate
power source.
Optional condensate that are 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.
2.5 Humidifi er Piping
The optional humidifi er on Mini Ceiling systems is a steam generator type with disposable cylinder.
The humidifi er make-up water should be brought to the humidifi er through the fi eld connection open-
ing using 1/4” copper tubing. A compression fi tting is provided at the humidifi er. A shut-off valve
should be provided outside the unit to allow disconnection of 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 Leak Testing
No installation is complete until the entire system has been thoroughly checked for leaks. This in-
cludes checking refrigerant tubing, fl are fi ttings, pressure controls, shraeder fi ttings and compressor
rotolock service valves. Check both fi eld and factory connections.
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