references
Compact air-air rooftop units
PJ range
This rotary heat recovery unit is used to transfer the heat and humidity from the air-conditioned room’s return air to the fresh air used for ventilation, before it is discharged outdoors. The return air circulates in half of the heat recovery unit and the ventilation air circulates in the other half, in the opposite direction. As the rotor rotates, very fine channels of air which form the matrix come into contact with the fresh air and the return air in turn, thereby transferring heat and humidity from one circuit to the other. The efficiency of the recovery depends on the following factors: Wheel dimensions: • 800 mm: • 1200 mm: • 1500 mm: models 0090 to 0190 models 0200 to 0240 models 0280 to 0380 The rotary heat exchanger is designed to be attached to the side of the unit. This module incorporates gravimetrics filters G4 in the fresh air intake and in the output of the extraction air. Optionally, they can be replaced by G4 with low pressure drop or G4 + F6. This assembly can be supplied, in option, with a speed drive for the wheel which avoids the risk of ice forming on the wheel during the defrost operation. The speed drive is compulsory with output temperatures on both sides of the wheel lower than 1°C or an average temperature on the wheel lower than 3ºC.
Matrix materials: • Aluminum: sensible heat recovery. • Epoxy coated aluminium: sensible heat recovery in aggressive environments. • Hybrid wheel: enthalpic recovery. • Silicagel coated aluminium: Enthalpic recovery with high efficiency in the recovery of latent heat. Channel cross sections: The wheel consists of two sheets of aluminum, one smooth and one corrugated. The corrugated sheet can be supplied in two different configurations: • Spacing of 2,0 mm: the commonly-used cross section due to its high efficiency and moderate pressure drops. • Spacing of 2,5 mm: low pressure drop. Designed for high frontal speeds with low pressure drop. Important: the calculations for the selection of a rotary heat exchanger according to the parameters described above should be done using our “Selection Software”.
Auxiliary hot water coil, with three-way valve and proportional control, for assembly and connection inside the unit.
PJ range Air pressure drop Water 80/60ºC and inlet air 20ºC Water 90/70ºC and inlet air 20ºC Heating capacity (mm.w.c.) (kW) (m /h)
3
0090
2.4 27.6 1.4 0.2 34.2 1.7 0.3
0120
3.5 32.0 1.6 0.3 39.8 2.0 0.4
0140
3.6 48.2 2.1 0.5 59.6 2.6 0.7
0160
4.0 50.0 2.2 0.6 61.8 2.7 0.8
0180
4.3 51.6 2.1 0.6 63.8 2.8 0.8
0190
4.3 51.6 2.1 0.6 63.8 2.8 0.8
0200
3.4 95.8 2.7 0.5 118.5 3.4 0.7
0220
4.3 104.0 2.9 0.5 128.7 3.6 0.8
0240
4.3 104.0 2.9 0.5 128.7 3.6 0.8
0280
3.9 129.7 3.6 0.9 159.7 4.5 1.3
0320
4.2 137.8 3.9 1.1 169.8 4.7 1.5
0360
4.5 141.1 4.0 1.1 173.8 4.9 1.6
0380
4.5 141.1 4.0 1.1 173.8 4.9 1.6
Water pressure drop Heating capacity
(m.w.c) (kW) (m /h)
3
Water pressure drop
(m.w.c)
Note: With stop-drop in the indoor air coil it is not possible to assemble the hot water coil.
Auxiliary electrical heaters, with two power stages and on/off control, for assembly and connection inside the unit.
PJ range 090 / 0120 0140 / 0160 / 0180 / 0190 0200 / 0240 / 0280 0320 / 0360 / 0380 Current (A) (400 V / III ph / 50 Hz) Total power (kW) Stage power (kW)
9 3+6 13.0 13.0 not available not available 18 9+9 26.0 26.0 26.0 26.0 39.0 39.0 39.0 27 9 + 18 not available not available 52.0 52.0 36 18 + 18
512
HEAT PUMPS - AIR CONDITIONNING - REFRIGERATION - AIR HANDLING - HEAT EXCHANGE - NA 17.01 A