Herrtronic
®
MD Series
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
6
www.herrmidifier-hvac.com
III. INSTALLATION INSTRUCTIONS
Allowable Operating Conditions:
Ambient Temperature: 40ºF - 120ºF (4ºC - 50ºC)
Ambient Relative Humidity: 0% to 90%
Line Voltage: -15% to +10% of Nominal
Frequency: 50/60 Hz.
Supply Water Temperature: 40ºF-100ºF (4ºC-38ºC)
Supply Water Pressure: 20-100 psig
Supply Water Conductivity:
•
70-1000 mincromho (on-off control)
•
200-1000 micromho (prop or P + I control)
(See Figure 30 & 31 on page 27 for alternative water conditions)
Maximum Duct Static Pressure: 5” MDM, 7” MDS/MDD
units
NOTE: If units are mounted in outdoor enclosures, conditions
inside enclosure must be maintained as shown above.
Mounting
The cabinet is designed to safely contain the working com-
ponents of the Herrtronic MD humidifier and dissipate heat to
protect the electronics. Herrtronic MD Series electronic steam
humidifiers, room distribution units, steam pipes, and any ac
-
cessories should be located in a manner to facilitate routine in-
spection and any necessary maintenance. The unit should not
be located above (such as false ceilings) or around valuable
property, where a malfunction could cause damage. Correct
positioning of the Herrtronic MD humidifier is important to allow
for proper operation and easy maintenance. Minimum clearance
around the cabinet should be maintained as follows:
Unit Clearances By Model
Unit Series
MDM
5-30 Lbs.
MDS
10-100 Lbs.
MDD
110-250 Lbs.
Left
2”
2”
2”
Right
20”
20”
20”
Top
12”
12”
12”
Bottom
10”
10”
10”
Four lag bolts, (2) 5/16” and (2) 1/4”, are supplied with the MDS
and MDM units which are designed to be secured to a wall. In-
stall the top two lag bolts (5/16”) according to the dimensions in
Figure 1. Hang the unit on the wall, and then install the bottom
two lag bolts (1/4”) and secure all four bolts. Be sure the unit is
level and mounted directly to the wall to wood studs at least 2”
thick (or equivalent).
Operating weights are as follows:
•
MDM - 82 lbs.
•
MDS - 131 lbs.
•
MDD - 258 lbs.
WARNING!
Do not mount any controls inside the unit or tap power from
any location in the unit, except as stated in these instruc-
tions. Do not place objects near the cabinet. Do not attach
to dry wall without studs.
NOTE
To mount the Room Distribution Unit, refer to the “supple-
mental” RDU Installation Instructions.
Plumbing
To make the necessary connections for water fill and drain,
the following steps are required: (refer to Figure 2 for drain
location)
1. Install an external shutoff valve between the water supply
and the humidifier for ease in servicing the unit.
2.
Connect water supply to 1/4” compression fitting on the
bottom of the cabinet.
CAUTION!
Do not use reverse osmosis or demineralized water treatment
without first consulting the factory. This water may not be suf
-
ficiently conductive to allow proper operation. Consult factory
if water is outside the range of allowable conductivities. Do
not use hot water.
5.25
16.00
4.25
22.38
4.00
1.81
21.89
1.81
16.00
1.50
1.50
21.56
1.82
MDS
MDM
Ø .38" x Ø .75"
Keyhole Slot
Typ.
.75 Typ.
Both units
Ø .25 Typ.
5-30#
10-100#
Figure 1
