Herrmidifier Herrtronic MDD - Manual (Page 3)

Herrtronic ® MDD Supplement
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
3 www.herrmidifier-hvac.com
I. PREFACE
These instructions are designed to cover the specific differences in the installation of a Herrmidifier Herrtronic MDD Electronic Steam
Humidifier (110-250 lbs/hr. unit) versus an MDM or MDS Electronic Steam Humidifier (5-100 lbs/hr. unit). These instructions are to
be used in conjunction with the Herrtronic MD Series Installation and Operations Manual (OM-93) as there are cross references
between that manual and this supplement. The primary intent of this supplement is to deal with the installation differences between
the MDD and the MDS or MDM. The operating, start-up and troubleshooting sections are common to all the MD’s and can be found
in the Herrtronic MD Series Installation and Operations Manual (OM-93). The one exception to this is the fact that you must turn
on both the master and the slave unit with their respective “On/Off” button.
II. UNIT OPERATION
All MDD units are operationally tested before shipment. They have been setup and run with the control signal and power supply spec-
ified on the purchase order. Any changes in power supply or control technique will cause the unit to require changes prior to start-up.
All MDD units have two steam cylinders, two fill assemblies, two drain assemblies, two sets of power contactors, two main circuit
boards and one display board. There are two knockouts for power wiring, a knockout for control wiring, one water inlet, two steam
cylinder drains, and two cabinet drains. The steam cylinder on the right is the master and the one on the left is the slave. Simply put,
the components for two independent steam boilers are housed in one cabinet.
Figure 1
As mentioned earlier, there are two main circuit boards, and one display board. The master and slave control board keypads are
accessible through the front panel. Communication between the Master and the Slave is accomplished through the networking
capability of the main circuit board (Page 15, MD IOM). The address of the master will always be 00 and the address of the slave
will always be 01. Each cylinder (Master or Slave) will fill, boil, and drain independently, based on the commands from their respec-
tive main circuit board. Establishing set points, operating the units, fault reporting and general monitoring of performance for both
Master & Slave is typically done from the master control keypad and display using menu 4 of the master control. When in menu 4 of
the Master, access the Slave and use the Master keypad to make any necessary changes to the Slave control board. (See step 13
Operating Instructions of MD Manual.)
Figure 1
Master Section
Steam Cylinder Assembly
(2) Fill Assemblies
Drain Assembly
Slave Section
Steam Cylinder Assembly
Drain Assembly
Steam Hose Outlets
Steam Hose Outlets
Plumbing Connections
(2) Steam Cyliner/Cabinet Drains
Plumbing Connections
(1) Water Inlet
Electrical Section
Contactors
Transformers
Cylinder Interface
Terminal Blocks
Circuit Boards - Master
Slave
Display
Power wiring
Controls
Wiring