Herrmidifier: Engineered Humidification Systems


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MD Series

Herrtronic MDThe Herrtronic MD Series is the most advanced steam humidification system available today. Selection includes three sizes with capacities ranging from 5 to 250 lb/hr. and up to 600 VAC. All units are ETL and CSA approved.

Principal features are "user friendly" microprocessor-based controls, a digital display providing up-to-date operating information, a networking capability that accommodates up to 29 slave units and the diagnostic capability to prevent operational problems before they occur. This diagnostic capability simplifies service and maintenance saving both time and expense. The Herrtronic MD design accommodates a variety of control systems to meet the needs of each application.
Features
DESCRIPTION
The Herrtronic MD system includes the microprocessor - based Herrtronic MD unit, steam distribution hardware and control accessories. The Herrtronic MD features an LCD display, "user-friendly" programming, system diagnostics and the flexibility to utilize "on/off", "proportional" or "proportional + integral" control. For larger applications, these systems can be networked in a "master/slave" relationship with up to 29 slave units. The Herrtronic MD system is sufficiently versatile to operate with softened water.

Utilize the Herrtronic MD Series, the ultimate capability in steam humidification systems, to meet your humidification needs - computer rooms, telecommunication switchgear facilities, laboratory clean rooms. Consider these outstanding features:

Styling
These aesthetically pleasing Herrtronic MD units are constructed of 16 and 18 gauge steel and finished with off-white powder coat finish. All piping and wiring is routed through the bottom behind the integral skirt to maintain smooth lines. Access to the disposable polypropylene cylinder is through the front access door. Service access to electrical controls are through the front and side access doors.

Flexibility
Three sizes of units are available - (A) 5-30 lb./Hr, (B) 10-100 lb./hr, (C) 110-250 Lb./Hr - to meet your requirements. These units can be applied to 50 or 60 Hz. Single phase units are available through 50 lb./hr, three phase through 250 lb./hr. All systems are ETL and CSA approved. All units are designed to run on raw or softened water with a conductivity range of 70-1000 micromho.

Versatility
Control versatility is a distinguishing feature assuring application success! "On/Off" control is available for less demanding applications. Modulation can be accomplished in (1) the "proportional" control mode with a control signal (ohms, VDC or mADC) from an input device or "building management system" or (2) the "proportional + integral" mode receiving input from a sensor (VDC or mADC).

Versatility continues with the selection of the control scheme. For an installation with varying psychometric conditions (i.e., VAV, high levels of fresh air, humidification during cooling, etc.), a system with a conventional ("On/Off" duct mounted) high limit could routinely "shut down". The Herrtronic MD system will accept a proportional high limit (in addition to the proportional control input). Typically, the MD unit microprocessor establishes a capacity setpoint based solely on the control input signal. In addition, the Herrtronic MD system monitors the proportional high limit input and, in response, adjusts (reduces) the capacity setpoint. This feature enhances the system control accuracy and minimizes the likelihood of short-cycling extending system life. Only the input devices vary. This inherent versatility is only available with the Herrtronic MD system.

Display
The informational center of the system is the LCD display with two lines, 20 characters per line. The keyboard provides simple access to "scroll" through unit operating dynamics and adjust setpoints as necessary. Certain setpoints are "secured" and require password entry to make adjustments. Most setpoints have a built-in default value to simplify programming. The display varies with the type of control system such that only applicable data is provided.

The Herrtronic MD monitors system operations and identifies undesirable conditions. Some, "faults" such as "current overload", result in system shutdown. Other 'faults" indicate potential fill or drain system problems but allow the humidifier to continue operating. The "Master" unit will indicate the occur- rence of a "fault" in any remote unit. Herrtronic MD diagnostics simplify required maintenance reducing both time and expense.

Networking
The Herrtronic MD system utilizes an RS-485 communications network. A master unit can communicate with up to 29 slaves. This represents up to 3000 lb/hr of humidification capacity. And the RS-485 communication link allows up to 4000 feet between the master and slave units. This integral capability is virtually unlimited.

Accessories
Complementing the Herrtronic MD unit are a full line of accessories. Low profile "Room Distribution Units" are available to deliver humidification to the conditioned area. For critical applications where quick, guaranteed absorption is required, consult the factory for selection of the appropriate CS-Series steam distribution system. Supply voltage and control are provided by the humidifier. Steam piping can be routed through the back or bottom. Stainless steel steam distributor pipes for duct installation are available in a variety of sizes. All are pitched to return any condensate to the steam cylinder(s) - eliminating any unnecessary condensate piping. A variety of control devices are available for wall or duct installation for any type of system control.

Warranty
Durability and reliability are an inherent feature in all Herrmidifier products. Each Herrtronic MD system is supported by our (2) year warranty (applicable to all parts except the replaceable cylinder).
Specifications

Part 1 Scope 


PART 1 SCOPE

Herrmidfier shall:

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  1. Furnish a humidification system for the project known as _____________________: ________ft. long x ________ft. wide x _________ft. high. 
  2. Select a system that will maintain (automatically) _______%R.H. at _______°F with tolerance of ±__% R.H.  
  3. Warrant the system (except the replaceable steam cylinder) for 2 years from date of shipment.  
  4. Provide an installation manual and operation and maintenance manual (for start-up, maintenance and diagnostics).  

PART 2 PRODUCT

The Herrtronic MD System shall consist of:

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  1. A self-contained electrode steam humidifier having a capacity of ____lbs/hr (or kg/hr) with electrical characteristics of ______VAC/______Ph./______Hz. The humidifier shall be capable of operating on water with conductivity from 60 to 1500 micromhos automatically.
     
  2. A humidity control system utilizing one of the following control modes (shown with corresponding input method):

      On/Off (Humidistat)

    • Proportional (Transmitter or signal-ohms, VDC, mADC)
    • Proportional + Integral (Sensor or signal ­ VDC , mADC)

    The control mode is integral with the Herrtronic MD unit. The input devices shall be:

    1. Control input device (or signal) ____
    2. High limit humidistat _____ OR
      Proportional high limit device (or signal) _____

      Note: This enables modulating control systems ("Proportional" or "Proportional + Integral") to adapt the capacity setpoint in response to varying psychometric conditions ­ i.e., VAV systems, applications with high percentages of outdoor air, etc.

    3. Air proving switch _____ Note: standard on "Room distribution Unit"

     

  3. A steam distribution system consisting of:
    1. Stainless steel steam distributor pipes (for horizontal or vertical installation) with integral pitch OR

      Room distribution unit (RDU) with adjustable speed control. The supply air blower shall operate approx. 15 minutes after unit shutdown. Steam input shall be thru the bottom or back of the unit. The RDU shall be remote/unit mounted. Supply voltage and control input shall be provided by the humidifier.

    2. ____ft. of EPDM steam hose OR

      ____ft. of insulated copper pipe shall be provided for connection between the unit and the steam distribution system.
      Note: The system operates at atmospheric pressure.
      Consult factory if duct static pressure exceeds 5" (MDM units) or 7" (MDS and MDD units). 

  4. An integral microprocessor control, monitor and diagnostic system. The microprocessor shall:
    1. Sense water conductivity and adjust water level and output capacity.  
    2. Provide programmable set points with built-in default values for simplified startup.  Only setpoints pertinent to the control mode are accessible. Certain setpoints shall be password secured to prevent tampering.  
    3. Provide adjustable drain tempering capability.  
    4. Include an LCD display (for longer life and easier viewing)-- (2) lines, 20 alpha/numeric characters per line --to monitor system operation/performance. Only parameters pertinent to the specific humidity control system shall be displayed.  
    5. Provide "fault" sensing and display the type of fault. Certain faults shall result in system shutdown. Other faults reflect a potential maintenance problem and allow the unit to continue operation.  
    6. Provide visual indication (LED) of (1) cylinder full, (2) power, (3) fault.
      The humidifier shall also have (3) LED indicators to display:
      (a) Cylinder Full (Red)
      (b) Power (Green)
      (c) Fault (Red) 
    7. Network with up to (29) slave units. The master shall be capable of providing operational information on any of the slave units individually.  
  5. Terminal connection points for all line and low voltage (control) connections. A system on/off switch shall be externally available. A door interlock switch shall prevent operation when the access door is open.  
  6. Multiple cylinder humidifiers (Series MDD, over 100 Lbs/Hr) with separate fill and drain provisions. These units shall be capable of common or independent control. Each cylinder shall have a separate microprocessor control.  
  7. A powder coated steel cabinet with lockable cylinder access door. The glass filled polypropylene cylinder shall be easily replaced. Electrode wiring shall be connected with a nut to prevent loosening of the connection. (Friction connections are not acceptable).  

PART 3 INSTALLATION

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The installing contractor shall assume responsibility according to the installation manual, specifically:

  1. Application within system limitations  
  2. Mounting recognizing required clearances  
  3. Provide water supply (including softened water) in accordance with pressure and conductivity criteria. Hot water shall not be applied.  
  4. Provide cylinder and unit drains  
  5. All wiring shall be in accordance with applicable sections of national, state and local electrical codes. The contractor shall provide and install external overcurrent protection and install system wiring in accordance with the manufacturers requirements.  

PART 4 SOURCE

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Herrtronic MD Systems are manufactured by Herrmidifier,
Trion Inc., 101 McNeill Road Sanford, NC 27330