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I n s t a l l a t i o n , O p e r a t i o n , & M a i n t e n a n c e M a n u a l
As shipped, the RDU is set up for direct unit mounting.
Longer wiring and condensate return tubing (supplied) will
be required for remote mounting. Be sure to use 18 gauge
(minimum) copper conductor wire with insulation rated for
600 VAC. Supply power may originate from the Herrtronic
humidifier or a separate supply. If a separate source is
used, be sure to install a dedicated power disconnect.
All hardware and accessory components required for
installation are included as listed below:
Accessory Bag Contents
Item
¾" I.D. Plastic bushing
3" Diameter plastic hole plug
5/16" I.D. Plastic bushing
Steam inlet union
2 ½" Stainless steel hose clamp
¼" x 2" Lag screw
#8–32 x 3/8" Stainless steel machine screw 4
Wiring Kit
¼" O.D. Condensate return tubing
*-Double quantity for RDU-D-2 series units
10.05"
16.91"
Figure 2 - Overall Dimensions
4
w w w. h e r r m i d i f i e r - h v a c . c o m
III. INSTALLATION PREPARATION
Disconnect power to the humidifier while
The RDU unit must either be placed higher than the
Herrtronic unit or provisions for handling the condensate
via an external drain must be made. The following chart
details the physical clearances around the cabinet for
servicing the unit. Figure 13 details the clearances required
Quantity
due to the steam plume.
2
2
MINIMUM CLEARANCES AROUND CABINET
LEFT - 15"
1
RIGHT - 15"
1*
TOP* - 2"
1*
BOTTOM - 0"
2
* Subject to output, fan speed and room conditions
1
The steam plume should not impinge on walls,
10'
ceilings or other objects. Supply air registers, if
present, must be directed away from RDU.
1.20"
3.00"
(4) 7/8" Holes
Power Access
(2) 7/8" Holes
Optional Condensate Drain
(4) 7/8" Knockouts
Power Access
15.40"
! WARNING !
installing RDU.
NOTE:
7.13"
4.00"
4.99"
.99"
.56"
Front of Unit
Figure 3 Top View Dimensions
Figure 3 - Bottom View Dimensions
Figure 4 - Bottom View
12.00"
2.45"
2.45"
2.30"
3.00"
1.00"
.99"
4.14"
5.77"
12.76"
Figure 5 - Back View
Figure 4 - Back View Dimensions
H e r r t r o n i c
R D U - D S u p p l e m e n t
®
7.70"
(2) 3" Holes
Steam Hose Inlet
(2) 5/16 X 5/8 Dia.
Keyhole Mounting Slots
(2) 2 1/2" Holes
Optional Steam Inlets
2.50"
.50"
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