Specifications
6
PIPING AND WIRING
Figure 6-1: Drain Adjacent to Wall
Drain Piping Configurations
Figure 6-2: Drain Through or in Wall
Humidifier Cabinet
Appropriate reducing
coupling serves as a
funnel (by others)
Cabinet Drain
Connection ½"
NPT Half Coupling
Humidifier
Drain Valve
Humidifier
Drain
Connection
¾" Sweat
Union
Mounting Bracket
Wall
Humidifier Drain Line - ¾"
Hard Copper
(by others)
Cabinet Drain Line -
½" Hard Copper
(by others)
1" Air Gap
Drain Pipe: Refer to
governing codes
OM-225
Mounting Bracket
Wall
Humidifier Drain Line
¾" Hard Copper
(by others)
Cabinet Drain Line -
½" Hard Copper
(by others)
1" Air Gap
Appropriate
reducing coupling
serves as a funnel
(by others)
Drain Pipe: Refer to
governing codes
Cabinet Drain
Connection ½"
NPT Half Coupling
OM-226
Humidifier
Drain Valve
Humidifier Drain
Connection ¾"
Sweat Union
Humidifier Cabinet
Note: Locate the cabinet drain line exit away from the
humidifier drain line exit, if possible. This will prevent
water vapor from migrating up the cabinet drain line,
causing the cabinet bottom to rust. Extending the
cabinet drain line may be effective also.
WIRING
Water make-up piping may be of any code-approved
material (copper, steel, or plastic). The final connection
size is 1/4" NPT. 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 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" O.D. for evaporator
drain and 1/2" NPT for cabinet drain. These connection
sizes should not be reduced. (See figures 6-1 and 6-2
for proper drain piping configurations.) The evaporator
drain and cabinet drain should be piped separately to
and discharge into a floor drain. Combining the two into
a single drain line may result in the backflow of drain
water into the humidifier cabinet leading to malfunction-
ing of the unit.
All wiring must be in accordance with all governing
codes, and with VAPORMIST
®
or VAPORMIST DI
wiring diagrams. The diagram is located inside the
removable front panel on the right-hand side of the
unit.
VM-IOM-1996 Scan.pdf 6 11/19/2009 9:57:23 AM