General Features
DL air cooler for -5~+5 degree C, mainly use for chiller room.
DD for -15~-25 degree C, mainly use for freezer room.
DJ for -25~-40 degrees C, mainly use for blast freezer room
Cabinet of magnesium steel, corrosion-proof
Fin space: 4.5mm, 6.0mm and 9.0mm
Refrigerant: R22, R404A, R507A, etc
Stainless steel heater, defrosting evenly
Double water receivers, more stable
Mechanically expanded pipes with Aluminum fins
Long distance air throw is optional
Coils
 
Manufactured from 9.52 " o.d. copper tube mechanically expanded into heavy gauge aluminium plate fins will fully collared holes to ensure an efficient and permanent bond. Fin spacings 4 mm, 6 mm or 8 mm.  Copper tube suction headers and distributors are individually sized to suit the exact operating conditions. Brazed joints are made with silver bearing copper alloy. Coils are pressure tested to 26 bar g, vacuum dehydrated and sealed with a dry nitrogen charge.
 
Casting:
 
Galvanised sheet steel white polyester powder coated for flush ceiling mounting or base mounting onto steelwork.
 
Axial Fan
 
Axial flow, non overloading aerofoil fans with polypropylene variable pitch blades secured into diecast aluminium hubs, keyed and locked onto the motor shaft. The fans run in a formed bell mouth orifice for efficiency and low noise.
 
Motors
 
Totally enclosed class F insulated metric frame, 380/420/3/50 Hz IP55.
 
DEFROST OPTIONS
Electric
For efficient defrosting low power density 200/250V 1 ph stainless steel sheathed elements are provided in the coil and draintray.  Heaters are wired to a terminal box for 3 phase + neutral supply.
ED 1 Light duty defrost for marginal room temperatures.
ED 2 Normal duty defrost for low temperature applications.
FP Fan Peripheral Heaters - for applications with room temperature below zero.
Reverse Cycle / Hot gas
Coils may be circuited for reverse cycle or hot gas defrost with electric elements or hot gas tubes in the drain pan.
HGE Hot gas coil, electric drain tray HGD Hot gas coil and tray RCE Reverse cycle coil, electric tray RCD Reverse cycle coil and tray
 
NOISE LEVELS
 
The noise levels stated are at a distance of 3 m from the unit at an angle of 45° to the horizontal in free field conditions with no reflections. These are intended to be used as a guide for comparison purposes. In practice the noise generated will be reflected off the enclosure surfaces and may be absorbed by the product within the room. For applications where noise levels are critical lower speed fans can be offered and the advice of an acoustic specialist is recommended.
 
Easy Clean Casing
Accessible clean in position drain pan with 75 mm gap under coil to allow unrestricted access for cleaning and inspection. Access to fan plenum.
Plain Galvanised Casing
NS4 Marine Grade Aluminium Casing.
Stainless Steel Casing.
Insulated Drain Pans
Coils circuited for chilled water / glycol
 
AIR THROW
Cooler air throw is dependant upon coldstore design, product loading and positioning of coolers. Generally one metre space above product with no obstructions allows the air to travel considerable distances, providing that the room is tall and adequate space is allowed to return air at low level and velocity. Low head rooms need careful cooler siting and some means of separating discharge and return air. Cooler fans suck air back as well as blow.
 






 DD series High Effective Cold Room Evaporative Air Coolers Specification: