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CUH heavy duty unit heaters 3kW to 40kW

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Applications

Heavy duty unit heaters for horizontal or vertical mounting. Ideal for space heating of larger areas such as warehouses, open plan stores, sports halls, factories and workshops also for anti condensation heating in plant rooms.

The CUH Heavy Duty Unit Heater can be installed horizontally at high level to act as combination heater and de stratification fan. Hot air generated by heaters, process heat and machinery is automatically recycled from high level down to the occupied space, if the required low level temperature is still not attained the heater elements are energised until this is the case.

De stratification alone can produce savings of around 30% thus by incorporating this facility in the heaters the total energy cost and overall installation cost can be effectively reduced. The reduction in high level temperature reduces the heat losses through the roof and the return of heated air to low level reduces the overall heat requirement.

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Features

  • rugged heavy duty finned metal sheathed elements.
  • totally enclosed permanently lubricated motor for increased reliability.
  • automatic reset over temperature cut out for added safety.
  • fan delay switch to purge unit of residual heat on switch off.
  • draw through design for efficient air circulation.
  • adjustable directional louvres for optimum airflow.
  • flexibility of horizontal or vertical mounting.

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Options

  • integral hydraulic thermostat (CUH-TH)
  • integral fan only switch (CUH-FSW)
  • integral hydraulic de stratification thermostat (CUH-DTH)
  • integral 240V contactor for ease of installation (CUH-xx-xC) - standard over 7.5kW
  • horizontal mounting bracket for wall or ceiling or vertical mounting bracket for ceiling
  • eye bolt set for chain suspension (CUH-EYE)

Workshop Heater
Product image The Workshop heater package consists of CUH-xx-xC heater fitted with de stratification thermostat (CUH-DTH), remote thermostat with on/off switch (CUH-RTH) and vertical mounting bracket (CUH-VBxxx) The reference for this package is CUHW xx000

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Specification

Cat No Heater Fan motor Air Vol Dimension mm Max mtg ht m Throw W
kW V Ph W rpm m3/hr H W D Hor Ver m kg
CUH-03-1 3.0 240 1P 6.0 1550 680 450 368 165 2.8 2.8 3.7 12
CUH-03-3C 3.0 415 3P&N 6.0 1550 680 450 368 165 2.8 2.8 3.7 12
CUH-05-1 5.0 240 1P 6.0 1550 680 450 368 165 2.8 2.8 3.7 12
CUH-05-3C 5.0 415 3P&N 6.0 1550 680 450 368 165 2.8 2.8 3.7 12
CUH-07-3C 7.5 415 3P&N 15.0 1550 1190 620 546 165 3.0 3.7 6.7 23
CUH-10-3C 10.0 415 3P&N 15.0 1550 1190 620 546 165 3.0 4.3 6.7 23
CUH-15-3C 15.0 415 3P&N 38.0 1550 1870 730 546 165 3.4 6.1 9.8 30
CUH-20-3C 20.0 415 3P&N 62.0 1550 3400 865 743 256 3.7 6.7 9.8 55
CUH-25-3C 25.0 415 3P&N 62.0 1550 3400 865 743 256 3.7 6.7 13.7 55
CUH-30-3C 30.0 415 3P&N 62.0 1550 3400 865 743 256 3.7 6.1 12.2 55
CUH-40-3C 40.0 415 3P&N 186.0 1550 5200 865 743 256 3.7 7.3 16.7 55


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Selection

CUH unit heaters are designed for use as Space heaters. For satisfactory performance their total output must be sufficient to overcome the area's heat loss. The average temperature rise across the unit is 20°C and thus the CUH is not recommended for "spot" heating. (Installing an undersized or single heater to try it will not produce acceptable results.)

If even heating is important several units spaced around the area will give optimum conditions. Fewer high capacity units will give lower installation costs at the expense of evenness of heat. In each case the heaters should be positioned against outside walls and in areas of greatest heat loss. Their airflow's should support each other creating a circular air movement, ideally the total air volume of the space should pass through the heaters about three times per hour. The addition of centrally mounted "vertical" units will reduce stratification and improve overall space heating efficiency.

Integral or remote thermostats are recommended. Three phase units are supplied complete with integral contactors to facilitate easy control.

For vertical airflow units due consideration must be given to the maximum height of the heaters.

(For assistance with determining the number and size of CUH heaters required please submit the Heat Loss Help form or contact our Technical Department)

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Installation

For optimum performance the heater should not be mounted higher than the maximum height shown in the table. The heaters should not be mounted at a height of less than 2.2 metres, 3 - 5kW units not closer than 300mm to wall or ceiling and 7.5 - 40kW not closer than 450mm to ceiling and 600mm to wall. Standard brackets maintain these clearances.

Electrical connections should be made by a suitably qualified person in accordance with the latest edition of the IEE Requirements for Electrical Installation (BS7671:1992)

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Mounting

Standard mounting brackets are recommended especially for vertical airflow units. They ensure minimum clearances are maintained. Selection as per table:-

Airflow Heater Bracket A mm B mm
Horizontal 03-05 C35 300 300
  07-15 C720 450 600
  20-40 C2550 450 600
Vertical 03-05 VB35 300 300
  07-15 VB720 450 600
  20-40 VB2550 450 600

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Control

Temperature control is by either an integral (CUH-TH) or remote thermostat with on/off switch (CUH-RTH). On off switching should also be carried out via the control circuit not the main isolator as it is necessary to maintain power to the fan to allow it to run on. This purges the heater of residual heat.

CUH units for destratification use are fitted with an integral thermostat (CUH-DTH) which closes on temperature rise. This switches the fan off when the high level temperature has reduced to the pre-determined level usually about 25°C. The remote thermostat maintains the required low level temperature, by switching the heater elements.

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