Herrmidifier Herrmidicool Technical Guide - Manual (Page 13)

Herrmidicool Suggested Specifications
15781 HUMIDIFIERS
PART 1 GENERAL
A. SCOPE
1. Furnish and install as indicated on the drawings
an in-duct atomizing humidification and
evaporative cooling system complete with
Controls Cabinets with Modulating Control
Sections, and Atomizing Manifold Assembly.
Note: Manifolds are designed to introduce
moisture into an airstream. This airstream may
be either a traditional duct or AHU or the
discharge of an air turnover unit.
2. Warranty system for a period of two years from
date of shipment.
3. Provide owner's manual to cover installation,
startup, operating and maintenance instructions.
4. Water quality is essential to operation of unit.
Complete water analysis to be provided to
manufacturer for recommendations to enhance
performance and minimize maintenance.
5. Refer to schedule on drawings for capacities.
PART 2 PRODUCT
A. CONTROL CABINET
1. Factory fabricated and tested.
2. All internal components prewired and prepared
to terminals, ready for field connections.
3. ON-OFF switch with "Power ON" lamp.
4. Standalone systems provide supply and return
air humidity readings. DDC Interface system will
accept a 0-100% demand signal from building
automation system.
5. Relays for each stage (where applicable) of
control allowing stages to be controlled in
parallel or series.
6. Controls to incorporate a clean-out cycle time to
keep the heads clean and in working order.
7. Electrical requirements are 120 volt, single
phase. Maximum amp draw will be 5 amps per
control section or stage. Other voltages are
available.
8. Optional - The system shall incorporate an
automatic blow-down technique to empty the
water lines of all liquid on shutdown to prevent
freezing.
B. MODULATING CONTROL SECTIONS (In Control
Cabinet)
1. Each humidification system shall consist of two
control sections; one for compressed air supply
and the other for modulating water supply.
2. The water control section shall consist of a ball
valve, pressure regulator with strainer, pressure
gauges, water modulating valve and a solenoid
valve(s). Water pressure to the control section
shall be 50 psi and water pressure to duct
manifold shall be maintained at 40 psi minimum.
3. The air control section shall consist of a ball
valve, pressure gauge, solenoid valve, pressure
regulator with strainer, and an air pressure
switch. Compressed air to the control section
shall be 60 psi and air pressure to the duct
manifold shall be maintained at 30 psi.
4. If aggressive water is supplied, the water control
section will be constructed of 300 series
stainless steel components that resist
degradation.
5. All air & water piping shall be type "L" copper or
stainless steel.
C. ATOMIZING HEAD MANIFOLD
1. Manifold shall be factory assembled unit
consisting of air and water piping and atomizing
heads. Materials used will be based on water
quality.
2. Atomizing head capacity shall be (6), (8), (10),
(12), (15) pounds of water per hour. Larger
capacity heads will not be accepted. Heads will
be positioned to provide the maximum possible
distribution.
3. Atomizing heads shall be of materials not
adversely affected by the purity or
aggressiveness of the water, easily
disassembled for servicing with self-cleaning
and purging feature to provide a complete drip-
free operation. Average droplet size will not
exceed 30 micron at 100% output (on the Dv90
Scale) and will decrease as the system
modulates downward. Documentation of droplet
size available on request.
4. Atomizing heads will work on the internal mix
method.
5. External mix heads and heads with external
appendages are not acceptable.
6. Each head will not exceed 81 dBA when in
operation.
7. Single manifold systems to have full modulation
with a 30:1 turndown ratio. Dual manifold
systems to have full modulation on each stage.
8. Air/water ratio will increase as the system
modulates, which will reduce the droplet size.
Increasing or constant air/water ratios on
modulation will not be accepted.
9. Manifold length shall be as indicated on the
drawings or sized by the manufacturer to meet
HERRMIDICOOL Technical Manual