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  5. Installation, Operation And Maintenance Manual

S&P MD Installation, Operation And Maintenance Manual

Summary of MD

  • Page 1

    I n s ta l l at i o n, o p e r at i o n & m a i n t e n a n c e i n s t r u c t i o n s md dehumidifiers qa/iom/46 issue 11 - md dehumidifier.

  • Page 2

    Contents: page 1. General description 3 2. Preparation of dehumidifier from delivery 8 3. General operating instructions 9 4. Installation wiring 11 5. Control panel 15 6. Maintenance and fault finding 15 7. Spares list 17 1.1. General 5 1.2. Refrigeration system 5 1.3. Fan and ventilation system 6 ...

  • Page 3

    1. General description the dehumidifier is based around a closed refrigeration system comprising evaporator coil, condenser coil, expansion valve and compressor. It uses heat pipes to increase the cooling efficiency, allowing more moisture to be extracted, compared to conventional dehumidifiers. A f...

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    Page 4 figure 3. Front view with front panel removed figure 4. Side view with side panel removed qa/iom/46 issue 11 - md dehumidifier.

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    1.1. General the dehumidifiers are mounted on 2 skids at the front and 2 fixed wheels at the back. These allow secure siting of the units and make provision for local manoeuvring. All units are designed to allow lifting by forklift. Dimension and weights are shown below: voltage supply 230v. 4% 50 h...

  • Page 6

    1.3. Fan and ventilation system 1.4. Safety features compressor on delay hi/low pressure cut outs high level condensate all dehumidifiers use double inlet low-pressure centrifugal direct drive fans fitted with forward curved impellers. Restriction or adjustment of the air flow rate has a significant...

  • Page 7

    1.5. Performance the md range of dehumidifiers has been designed to operate between the following conditions: this corresponds to an approximate minimum wet bulb temperature of 13 c and maximum of 31 c. Performance is dependant upon both dry bulb temperature and relative humidity as shown in figure ...

  • Page 8

    2. Preparation of dehumidifier from delivery the dehumidifiers are shipped with the mains cable and condensate discharge hose stored inside the unit casing. Once located in the area where the unit is to operate (see section 3.1), the dehumidifier can be prepared for operation. The side panel should ...

  • Page 9

    3. General operating instructions 3.1. Siting of the dehumidifier this section describes the practical operation of the md range of dehumidifiers. The dehumidifiers should never be moved down slopes as they may become unstable and fall over. To move from one level to another they must be lifted by a...

  • Page 10

    3.2. Changing from pump to gravity condensate discharge 3.3. Fan only / dehumidifying (modes of operation) the condensate removed by the dehumidifier can be removed by pump or gravity to a suitable drain. Consideration as to the siting of the dehumidifier in relation to the drain is given in section...

  • Page 11

    To operate in dehumidifying mode the switch on the front panel should be placed in the dehumidify position, see figure 10. The dehumidifier will now operate until it is either turned off or the humidity in the space falls below that set on the humidistat. The required level of humidity should be set...

  • Page 12

    Figure 7. Wiring diagram for the md100 page 12 qa/iom/46 issue 11 - md dehumidifier.

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    Figure 8. Wiring diagram for the md160 page 13 qa/iom/46 issue 11 - md dehumidifier.

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    Figure 9. Wiring diagram for the md200 page 14 qa/iom/46 issue 11 - md dehumidifier.

  • Page 15

    5. Control panel 0 i on/off switch power to unit indicator fan speed switch water overflow indicator fan only switch figure 10. Layout of control panel on pillar 6. Maintenance and fault finding electrical and refrigerant work should only be carried out by competent engineers. Work which is not cond...

  • Page 16

    6.2 faults fan not on / red light not on: fan on but compressor not: pump drain pan full amber light on: drain pan overflows: ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! Mains power not on mains fuse blown switch on replace fuse dehumidify / fan only switch is in the fan only position start time delay defrost...

  • Page 17

    Compressor on / off all of the time: 6.3. Technical support 7. Spares list 7.1 electrical 7.2 refrigeration / mechanical ! ! ! ! Dehumidifier is operating below its operating range and freezing the humidity of the space is reduced to that required but rises as soon as the dehumidifier cuts out turn ...

  • Page 18

    S & p coil products ltd spc house, evington valley road, leicester, le5 5lu tel: (0116) 249 0044 fax: (0116) 249 0033 e-mail: spc@spcoils.Co.Uk web: www.Spcoils.Co.Uk qa/iom/46 issue 11 - md dehumidifier.