Connect Plumbing; Connect Water Feed; Connect Water Drain - Carel SD Installation & Maintenance Manual

Installation & Maintenance Manual

3. Connect Plumbing

3.1.

Connect Water Feed

The water feed connection is a 3/4" MPS male connection on the
bottom of the humidifier (2 on SD360 & 384 models, 3 on SD3B3).
Carel supplies a plastic adapter that screws onto the fill fitting and
gives a 1/4" OD compression fitting for plastic or copper tubing.
Since there is a strainer built into the bottom of the fill valve fitting,
you should use only the plastic adapter supplied as it is easily
removable for maintenance. To insure proper filling of the unit
during operation, run a 1/2" water line to within 3 feet before
reducing to 1/4" OD for the final connection.
A 1 1/2" air gap is built into the unit to pass all UL and local codes
regarding backflow prevention.
WARNING: The plastic fill fitting should be hand tightened only. A
wrench may be used on the 1/4" OD compression fitting.
NOTE: Use only potable water. Water conductivity should be
between 125 and 1250 micromhos. If water conductivity is over
250 micromhos, do not use softened water. Demineralized
water cannot be used as there are no minerals to conduct the
electricity.
3.2.

Connect Water Drain

The drain connection on the SD101 through 313 units is a 3/4" FPS
female threaded fitting. Connect a standard 3/4" MPT CPVC fitting to
this connection. Use a generous amount of thread sealant. DO NOT
overtighten and DO NOT use metal fittings as they can crack the
plastic drain pan. Drain lines from steam humidifiers MUST be trapped
immediately below the unit (Shown in figure to the right) in order to
prevent flash steam from rising out of the drain pipe and condensing
inside the humidifier unit.
On units SD323 and up, the drain connection is a 1 1/2" O.D. plastic
pipe. Insert the plastic drain elbow into a 1 1/2" CPVC drain line with a
2" bell adapter. Do not glue to humidifier drain. WARNING: Drain water
can be up to 200°F.
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