6
PIPING AND WIRING
WIRING
Water makeup piping may be of any code-approved
material (copper, steel, or plastic). The final connection
size is 1/4" NPT (DN8). In cases where water hammer
may be a possibility, a shock arrestor should be considered.
Drain piping may be of any code-approved material
(copper, steel, or plastic rated for 212 °F [100 °C]
minimum). If drainage by gravity is not possible, a small
lift pump should be used (DRI-STEEM part #400280).
The final connection sizes are 3/4" NPT (DN20) for the
tank drain fitting and the frame drain fitting. This
connection size should not be reduced. (See Figures
6-1 and 6-2 for proper drain piping configurations.)
The tank drain should be piped to discharge into a floor
drain. Combining the tank and frame drain pipes into a
single drain line may result in the backflow of drain water
into the humidifier cabinet, causing the unit to malfunction.
All wiring must be in accordance with all governing codes,
and with the VAPORMIST
®
or VAPORMIST DI wiring diagram.
The diagram is located in the removable subpanel cover on
the right side of the humidifier cabinet.
Note:
Locate the frame drain line exit away from the tank drain line exit, if possible. This will prevent water vapor from
migrating up the frame drain line. Extending the frame drain line may be effective also.
The use of semiconductor fusing sized per the National
Electric Code is recommended with the SSR option.
Humidifier cabinet
2" (50 mm)
Figure 6-1: Drain adjacent to wall
OM-1005-1
Figure 6-2: Drain through or in wall
OM-1006-1
3/4" NPT (DN20) frame drain
(male)
3/4" NPT (DN20) tank drain
(male)
1" (25 mm)
air gap
3/4" NPT (DN20)
tank drain
3/4" NPT (DN20)
frame drain
12"
(300 mm)
1" (25 mm)
air gap
12"
(300 mm)
2" (50 mm)
VMOM-0600.PDF 6
11/19/2009 9:59:11 AM
