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PG2021 Global HAHU-VP-ECM-005
A.
Technical Data
A . 1 .
G e n e r a l D e s c r i p t i o n
HAHU unit is an ideal air handling terminal unit for suspended ceiling installation and suitable for ducted air distribution. It is
constructed of sandwich panels to achieve low noise level during operation. HAHU air handling unit is shipped completely
assembled and motor wiring is introduced into the control box to reduce on-site installation time and manpower. Every unit is
thoroughly inspected and tested to clear up potential problems during startup. The unit contains side panels that provide easy
access to fans, motors and filters.
FRAMEWORK
A frameless structure is used. The panel is integrated folding steel structure and tested to ensure that there is no air leakage.
CASING
Casing is double skinned and basically consists of two panels with internal insulation. Each panel is 1” thick. The inner and outer
panels are made of plane galvanized steel and pre-coated galvanized steel. The insulation consists of a high-pressure PU foam
sandwiched in between to reinforce the panel.
FILTER
Filter is washable, double-layer acrylic nylon with aluminum frame. G4 (Merv 8) or F8 (Merv 14) filter is optional.
COIL
Coils are standard Cu/Al 3/8” OD provided with manual Air-Vent valves. The manifolds are made of steel with threaded
connections. The aluminum fins are pre-coated for protection by hydrophilic blue fin process. Coils are tested at 35 bar and
recommended maximum operation at 20 bar.
DRAIN PAN
Drain pan is made of single wall painting steel with 3/16" insulation on outer wall. The drain pan extends the full length and
width of the coil and is sloped for positive drainage and includes 3/4” male pipe threaded galvanized drain connector.
FAN SECTION
Fans are mainly constructed of housing, impeller, mounting feet, and DC motor. The housing is made of hot-dip galvanized
steel. The side panel includes inlet cones whose inlet conditions are designed for optimum aerodynamics. The scroll is fixed on
the side panel by spot welding. The wheel is made of hot-dip galvanized steel. The forward curved blades feature an advanced
aerodynamic design for maximum efficiency and minimum noise level. The impeller is fixed on the center plate and on the end
ring with riveting compression. The impeller is designed for maximum strength and can withstand continuous operation with
maximum power. All impellers and motor are fully balanced according to ANSI/AMCA-204 standard. The mounting feet are
made of galvanized steel sheet with unique technical to ensure adequate strength. HAHU fans are equipped with YZWWSL
external rotor BLDC motor. The motor consists of motor body and BLDC driver, controlled by 0~10VDC or Modbus RS485. This
new designed motor significantly reduces motor torque fluctuation, vibration and noise resulting in high efficiency, reliability
and long-life operation.
CONTROL SYSTEMS
1. Intelligent control (I type)
Intelligent control board is controlled via Infra-red handset and/or Intelligent wired wall pad, is field programmable and easy
to be configured through the wired wall pad or open Modbus protocol with VWV and VAV control logics, provides variable
speed indoor fan control, integrates with Intelligent modulating valves to allow Auto Dynamic Balancing and Intelligent
Constant Delta T management systems. It controls 2-pipe, 2-pipe with electric heater, 2-pipe with 6-way valve and 4-pipe
systems.
2. Flexible control (W type)
This control options features flexible functionality for external thermostat applications, allowing the independent control of
drain pumps (if equipped), offering zone control operations, and limited diagnostics. In products where louvers are required,
this control allows the stepping motors to open the louver at maximum position or close them when power of the unit is OFF.
Cooke Industries - Phone: +64 9 579 2185 Email: [email protected] Web: www.cookeindustries.co.nz
