Download Engineering Specification

Herrmersion RE Series Electric Element Steam Humidifier
15781 HUMIDIFIERS
PART 1: SCOPE
1. Furnish a humidification system for the project known as _____________________.
2. Operation of the system shall be controlled automatically to maintain _____%R.H. at ____°F with
a tolerance of ±_____%R.H.
3. Warrant the system to be free from defects in materials and workmanship for a period of two
years from date of shipment.
4. Provide (1) owner's manual to cover installation, startup, operation, maintenance & diagnostics of
unit.
PART 2: PRODUCT
1. Furnish a self-contained electric element steam humidifier having a capacity of ____lbs/hr with
electrical characteristics of _____VAC/Ph./Hz. The humidifier shall be capable of operating on
normal or demineralized water without modification. The equipment shall be supplied per the
schedule on the drawings. The humidifier shall be Model RES_-__ as manufactured by
Herrmidifier.
2. Unit(s) shall have a serviceable stainless steel steam canister with corrosion resistant heating
elements, water level sensor, and a high-temperature limit switch.
1. The steam tank shall be constructed of stainless steel and include a drain strainer. The
tank shall also have an integral surface skimming port to remove floating debris and
foam during fill cycles when non-treated water is used. This feature shall have user
adjustable interval & duration. The cover shall include a silicone gasket and shall be
removable by loosening threaded fasteners. Clamps will not be accepted. The steam
tank shall have a manual reset high temperature limit switch and act to de-energize the
power contactor in the event of an over-temperature condition.
2. The electric heating elements shall be constructed with corrosion resistant, alloy sheaths
and have screw down type connections. Plug type connectors can loosen and will not
be accepted.
3. The steam generator tank shall include water level controls in the form of two float
switches and be located in a portion of the tank segregated from the main steam
generating portion of the tank. Water level electrodes, float switches, and/or valves
located in the main portion of the tank are subject to excessive mineral build-up and will
not be accepted.
3. Water make-up system shall include inlet strainer, solenoid valve with flow regulator, and fill tee
with built-in air gap to prevent back siphoning.
4. Drain system shall consist of a solenoid valve, with shielded core dry operator.
5. Humidifier cabinet shall be 18/16 gauge steel and power-coat painted to protect against
corrosion. The electrical and steam generating compartments shall be separate, but contained
within the same cabinet to minimize field wiring. The access doors shall be lockable with a key.
6. Power to the resistive heating elements shall be controlled through the actuation of contactors
and solid state relays. Modulating system output by cycling contactors creates excessive noise
and prematurely wears the contacts and will not be accepted.
7. 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.
101 McNeill Road  Sanford, NC 27330  Phone: (919) 775-2201  Fax: (919) 777-6399
www.herrmidifier-hvac.com
8. The unit(s) will utilize one of the following humidity control systems (shown with corresponding
input method):
A. On/Off (Humidistat)
B. Proportional (Transmitter or signal-ohms, VDC, mADC)
C. Proportional + Integral (Sensor or signal - VDC , mADC)
The control mode is integral with the Herrmersion RE 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 to adapt the capacity setpoint in
response to varying psychometric conditions - i.e., VAV systems, applications
with high percentages of outdoor air, etc.
C. Air proving switch
9. A Native BACnet microprocessor control, monitor and diagnostic system. The microprocessor
control shall:
A. Sense humidifier demand and adjust water level and output capacity.
B. Include a backlit LCD display -- (2) lines, 16 alphanumeric characters per line -- to
monitor system operation/performance.
Note: Only parameters pertinent to the specific humidity control system shall be
displayed.
C. Provide programmable set points with built-in default values for simplified startup. Only
set-points pertinent to the control mode are accessible.
Note: Certain set-points shall be password secured to prevent tampering; such
as PID loop settings.
D. Provide adjustable drain tempering capability.
E. Provide "fault" sensing, record fault history, 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. Networkability to common BMS systems such as BACnet, Modbus, N2, or Lonworks.
10. A steam distribution system consisting of:
A. Stainless steel steam distributor pipe(s) with integral pitch OR
Room Distribution Unit (RDU) with adjustable speed control
Note: The supply air blower shall operate approx. 15 minutes after humidifier 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.
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: The system operates at atmospheric pressure
PART 3: INSTALLATION
1. Install the humidifier as detailed in the installation drawings and schedules and/or as
recommended by the manufacturer.
2. Mount unit recognizing required clearances
3. Provide water supply (including softened water) in accordance with pressure and quality criteria.
4. Provide tank 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 over-current protection and install system
wiring in accordance with the manufacturer’s requirements.
101 McNeill Road  Sanford, NC 27330  Phone: (919) 775-2201  Fax: (919) 777-6399
www.herrmidifier-hvac.com
Herrmersion RE Systems are manufactured by:
Herrmidifier,
101 McNeill Rd.
Sanford, NC 27330
101 McNeill Road  Sanford, NC 27330  Phone: (919) 775-2201  Fax: (919) 777-6399
www.herrmidifier-hvac.com