Herrmidifier Herrtronic MD Engineering Guide - Manual (Page 11)

Herrtronic ® MD Series
E n g i n e e r i n g G u i d e
11 www.herrmidifier-hvac.com
Herrtronic MD Suggested Specifications
Part 1 - SCOPE
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 a tolerance of +/- _____% R.H.
3. Warrant the system (except the replaceable steam cylinder) for
a period of two years from the date of shipment.
4. Provide an installation/operation/maintenance manual (for startup,
maintenance and diagnostics).
Part 2 – PRODUCT
The Herrtronic MD System shall consist of:
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 a conductivity of 70-1000 micromhos
automatically.
2. A humidity control system utilizing one of the following control
modes (shown with corresponding input method):
• On/Off (Humidistat)
• Proportional (Controller or signal-ohms/ VDC/ mADC)
• Proportional + Integral (Sensor or signal – VDC, mADC)
The control mode selection is integral with the Herrtronic MD unit.
The input devices shall be:
A. Control input device or signal _______
B. 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 psychrometric conditions – i.e.,
VAV systems, applications with high percentages of outdoor air,
etc.
C. Air proving switch_______NOTE: Air proving switch is standard on
“Room Distribution Unit.”
3. A steam distribution system consisting of:
A. Stainless steel steam distributors (for horizontal or vertical
installation) with integral pitch OR Room Distribution Unit (RDU)
with adjustable speed control. The supply blower shall operate
approximately 15 minutes after unit shutdown. Steam input shall
be thru the bottom or back of the unit. The RDU shall be remote/
unit mounted. The humidifier shall provide supply voltage and
control.
B. _______ 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: This system operates at
atmospheric pressure. Consult the factory if duct static pressure
exceeds 5” (MDM units) or 7” (MDS or MDD units).
4. An integral microprocessor control, monitor and diagnostic system.
The microprocessor shall:
A. Sense water conductivity and adjust water level and output
capacity.
B. Provide programmable setpoints with built-in default values for
simplified start-up. Only setpoints pertinent to the control mode are
accessible. Certain setpoints shall be password secured to prevent
tampering HERRTRONIC MD SUGGESTED SPECIFICATIONS
C. Provide adjustable drain tempering capability.
D. Include an LCD display (for longer life and easier viewing) – (2)
lines, 20 characters per line – to monitor system operation/
performance. Only parameters pertinent to the specific control
mode shall be displayed.
E. 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.
F. The humidifier shall also have (3) LED indicators to display:
a. Cylinder Full (Yellow)
b. Power(Green)
c. Fault (Red)
G. Network with up to (29) slave units (other MD control boards). 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 110 lbs/hr.) shall
have separate fill, drain and microprocessor control provisions.
These units shall be capable of common or independent control.
7. Unit shall have a powder coated steel cabinet with lockable
cylinder access and electrical compartment access doors. The
glass filled polypropylene cylinder shall be easily replaced.
Electrode wiring shall be connected with nut/lockwasher
combination to prevent loosening of the connection (Friction
connections are not acceptable).
Part 3 – INSTALLATION
The installing contractor shall assume responsibility according to the
installation manual, specifically;
A. Application with system limitations.
B. Mounting recognizing clearances.
C. Provide water supply (including softened water) in accordance with
pressure and conductivity criteria. Hot, RO, DI water shall not be
applied.
D. Provide cylinder and cabinet drains.
E. All wiring 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 manufacturer’s requirements.
PART 4: SOURCE
Herrtronic MD Systems are manufactured by:
Herrmidifier | 101 McNeill Rd. | Sanford, NC 27330