AHU Section

The unit casing is manufactured from non-toxic flame retarding, steam expanded polystyrene insulating material 25 to 45mm thick which meets with the requirements of ZERO ODP, with an inner and outer covering of 0.6mm Chromadek steel. Stainless-steel inners/outers can be fitted on request. The casing is assembled using anodised aluminium sections. Access doors are provided for easy access to all serviceable components of the AHU. These doors are fixed with aluminium hinges and are fastened with rugged glass reinforced nylon cam-locks, fitted with handles. Nylon square key cam-locks are also fitted standard on fan access doors for safety & security reasons. Where requested locks can be fitted keyed-alike.

Fan

The supply fan is either a Nicotra FCC or BCC fan which, together with the fan motor is mounted on a common frame/base & fan discharge opening sealed into a flexible canvas collar. Suitably sized pulleys are then selected & fitted in consultation with the approved computer generated fan selection.

All supply fan motors are suitable for speed control & will be wired to terminal boxes located on the exterior of the units unless switchboards are purchased.

Cooling Coil

The chilled and/or hot water coils, designed for counter flow & selected in accordance with ARI standards, are manufactured from aluminium fins, bonded to copper tubes & fixed into a galvanised coil casing. Copper fins & stainless steel frames are optional extras. Coils are positioned in stainless steel 304 drip trays complete with a 32mm MPT drain connection penetrating through the unit casing. Coils are sized to provide a maximum face velocity of 2.5m/s & come with an air bleed & drain fitting which fall over the drip tray.

Heater Bank

Electrical heater banks are installed to supply heating when required. The elements are manufactured from 3.2 Watt/cm² Incaloy and are fitted onto a sheet metal terminal box. The elements are removable as a single assembly. This removable assembly incorporates the element mounting plate and terminal cover. An auto overheat protection is also fitted onto this assembly as standard.

Filters

Standard washable removable 50mm primary filters are normally installed into appropriately sized galvanized holding frames on the air entering side of the cooling coil. 100mm depths are also available. Filter frames are "flashed", using 1.6mm galvanised sheet metal, to unit casings for rigidity & air bypass prevention. Furthermore filter banks are reinforced with 5mm flat bar lengths in anticipation of strong forces when filters become dirty.

Initial Resistance - Approx. 65Pa
Final Resistance - Approx. 250Pa

Primary filters are generally selected to produce a face velocity of not more than 2.5m/s.

Where required bag or rigid cassette type secondary filters, EU9 rating, are installed into common filter frames with the primary filters. Bag filters typically vary in length from 300-600mm & manufactured with 6 to 8 "pockets" depending on filter size. A gasket will be installed between primary & secondary filters when a common frame is shared.

Stand alone dedicated secondary filter banks are also installed depending on the nature of unit design & application.

Initial Resistance - Approx. 135Pa
Final Resistance - Approx. 400Pa

Secondary filters are generally selected to produce a face velocity of not more than 2.5m/s.

Where specified, high efficiency particle arrestor (HEPA) filters with an EU11 rating shall be fitted down-stream of the cooling coil. HEPA filter holding frames are to be manufactured from powder coated 1.6mm tubular steel and flashed and sealed to the unit casing in such a manner that there is zero bypass of unfiltered air. The HEPA filters are to be fastened into these frames using clamps and seals but are not to be fitted into the A/C unit until the interior of the unit as well as all ducting has been blown clean. The fitting & particle count testing of these filters is carried out by others on site.

Industry standard Dwyer Differential Magnehelic Pressure Gauges are installed across each filter bank for spot inspections.

Initial Resistance - Approx. 250Pa
Final Resistance - Approx. 500Pa

HEPA filters are generally selected to produce a face velocity of not more than 2.5m/s.
HEPA filters are always supplied loose, still sealed in their original cartons, for fitting by others on site.

Electrical Switchboards

Switchboards are fabricated from 1.6mm electro galvanised sheet metal, primed & spray painted electric orange & recess, or surface mounted, into unit casings with outer doors of the same material as the unit. The inner door houses the alpha numeric controller display, plant control switch, run/fault pilot lights & main isolator handle/s. Ammetres & voltmetres are optional extras. Each switchboard incorporates door interlocking isolators, short circuit protection, contactors & overloads for the safe & efficient operation of the A/C unit.

Temperature Control

When controls are supplied they are already factory commissioned & operational.

Installation

The unit must be handled with care. Rough handling and dirty site conditions may damage coil fins and internal components as well as cause external damage to the casings.

The unit should be mounted on a firm, level surface, preferably on a 50-100mm high concrete plinth. The plinth, apart from raising the unit and base above standing water and ensuring a positive fall on the condensate drain, will also absorb all minor vibrations. A 150mm deep P-trap on the condensate drain is to be installed by the A/C contractor. These units are virtually vibration-free but, if desired, TECO pads can also be fitted under the feet of the unit.

Allow sufficient room around the unit for access as well as space to open access doors and to remove filters and other equipment.

Duct and pipe connections should be "self-supporting" and not place stress on the unit.

Connections to the Essential and Non-essential electrical supply and to the supply and return air ducting and external wiring are not included. The remote panel, if required must be installed by the contractor.

Performance and Specifications

Models 0075 HH - 065 HH in 25mm chilled water units

25mm

Heat Pump International Therm-O-Pac Air-handling Units
Modular 25mm Double skin Horizontal Draw-through
Models:- DS25 0075 HH - DS25 065 HH

Model DS25		0075HH	013HH	015HH	020HH	025HH	030HH	040HH	045HH	050HH	055HH	060HH	065HH
Supply Air Volume	l/s	750	1250	1500	2000	2500	3000	3750	4500	5000	5400	6000	6750
		Heating to customer specs
Unit Dimensions		Units supplied to customer specs.  The following table gives examples of dimensions applicable to standard loads, but these may be tailored to suit
Fan		AT 9/9	AT 12/12	AT 12/12	AT 15/15	AT 18/18	ADN 450	ADN 500	ADN 500	ADN 560	ADN 560	ADN 630	ADN 710
Fan Static	Pa	450	450	450	450	450	450	500	500	500	500	500	500
Filter Quantity		1	2	2	4	4	4	6	6	8	6	8	9
Filter Height	mm	500	500	600	500	500	500	500	600	600	600	600	600
Filter Width	mm	600	500	500	500	500	600	500	500	500	600	500	500
Unit Depth	mm	1160	1290	1290	1390	1500	1540	1500	1520	1520	1520	1900	2020
Unit Width	mm	840	1210	1260	1200	1340	1540	1840	1810	2340	2100	2300	1810
Unit Height	mm	680	720	760	1070	1140	1140	1160	1370	1160	1370	1410	2060
Unit Mass	kg	120	150	160	187	259	265	525	595	635	685	725	780

Note:
1. AHUs are fitted with resilient fan connections and rubber fan mounts.
2. All AHUs are manufactured as one unit.
3. If Mixing boxes are required add 600mm to depth, or use the Return or Fresh air connections plus 150mm, whichever is the greater.
4. Galvanised welded steel bases can also be offered. These bases are usually 165mm high.
5. 25mm Panels are not recommended for use where the fan pressure exceeds 800 Pa or when the units are mounted out of doors. Use 45mm.

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Models 0075 VV - 065 VV in 25mm chilled water units

25mm

Heat Pump International Therm-O-Pac Air-handling Units
Modular 25mm Double skin Vertical Draw-through
Models:- DS25 0075 VV - DS25 065 VV

Model DS25		0075VV	013VV	015VV	020VV	025VV	030VV	040VV	045VV	050VV	055VV	060VV	065VV
Supply Air Volume	l/s	750	1250	1500	2000	2500	3000	3750	4500	5000	5400	6000	6750
		Heating to customer specs
Unit Dimensions		Units supplied to customer specs.  The following table gives examples of dimensions applicable to standard loads, but these may be tailored to suit
Fan		1 x 9"	1 x 12"	1 x 12"	1 x 15"	1 x 15"	2 x 12"	2 x 15"	2 x 15"	2 x 15"	2 x 18"	2 x 18"	2 x 18"
Fan Static	Pa	550	550	550	550	550	550	550	550	550	550	550	550
Filter Quantity		1	2	2	4	4	4	6	6	8	6	8	8
Filter Height	mm	500	500	600	500	500	500	500	600	600	600	600	600
Filter Width	mm	600	500	500	500	500	600	500	500	500	600	500	600
Unit Depth	mm	550	680	680	760	760	680	760	760	760	900	900	900
Unit Width	mm	850	1220	1270	1160	1290	1650	1850	1850	2330	2155	2275	2625
Unit Height	mm	1400	1500	1600	2000	2060	2000	2120	2350	2120	2460	2460	2460
Unit  Mass	kg	125	140	165	220	275	330	425	510	566	610	680	765

Note:
1. All AHUs are fitted with resilient fan connections and rubber fan mounts.
2. Fans are FCC DIDW as standard. BCC DIDW fans can also be offered although dimensions and specs. May change. Refer technical office.
3. All AHUs manufactured in one section although site assembly can be offered.
4. Mixing boxes can be fitted.
5. Galvanised welded steel bases can also be offered.
6. 25mm Panel units are not recommended for use when fan pressures exceed 800 Pa or when units are mounted out of doors. Use 45mm panels.

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Models 070HH - 200HH in 45mm chilled water units

45mm

Heat Pump International Therm-O-Pac Air-handling Units
Modular 45mm Double skin Horizontal Draw-through
Models:- DS45 070 HH - DS45 200 HH

Model DS45		070 HH	075 HH	080 HH	090 HH	100 HH	110 HH	120 HH	125 HH	140 HH	150 HH	160 HH	180 HH	200 HH
Supply Air Volume	l/s	7 200	7 500	8 100	9 000	10 800	11 250	12 000	12 500	14 400	15 000	16 200	18 000	21 600
		Heating to customer specs
Unit Dimensions		Units supplied to customer specs.  The following table gives examples of dimensions applicable to standard loads, but these may be tailored to suit
Fan		710	710	710	710	710	710	800	800	900	900	900	1000	1000
Fan Static	Pa	550	550	550	550	550	550	550	550	550	550	550	550	550
Filter Quantity		8	12	9	12	12	12	16	20	16	20	18	20	24
Filter Height	mm	600	500	600	600	600	600	500	500	600	500	600	600	600
Filter Width	mm	600	500 *	600	500 *	600	500 *	600 *	500 *	600	600*	600	600	600
Unit Depth	mm	2300	2300	2300	2300	2300	2300	2500	2500	2700	2900	2900	3000	3000
Unit Width	mm	2770	2370	2170	2370	2770	2870	2870	2970	2770	3470	3800	3370	3970
Unit Height	mm	1690	1880	2180	2180	2180	2180	2280	2280	2780	2620	2280	2780	2780
Mixing Box Length	mm	1050	1000	920	1000	1150	1200	1200	1250	1200	1275	1550	1400	1650
Unit Weight	kg	818	852	920	1023	1500	1890	1213	1265	1455	1515	1640	1820	2185

Note:
1. AHUs are fitted with resilient fan connections and Spring fan mounts.
2. All AHUs are manufactured as one section.
3. AHUs are manufactured with an Integral Aluminium Base.
4. The above dimensions are for FCC DIDW fans. BCC DIDW fans can also be provided but dimensions and specs. May change
     - refer to technical office.
* No Secondary filters can be fitted. Select an AHU with 600 x 600 filters.

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