CRAH UNIT | Pre-Functional CheckList

Last Updated: August 16, 2023, by

This CRAH Unit Checklist can be used and completed throughout the project and its different stages covering:

  • delivery,
  • storage,
  • installation &
  • pre-commissioning/pre-functional

Once the pre-functional checks have been completed, including all equipment and ancillaries related to the system, the full functional testing/commissioning can be conducted.

To know more on CRAH Units, including what they are, types, components etc, see our article 'CRAH UNITS | What are they?' or for FUNCTIONAL TESTING see CRAH UNIT | Functional Testing Example + Template

Delivery Inspection

Once the CRAH Unit arrives at the site, usually delivered by a transport company, and before being accepted into storage, the following should be checked with the driver.

Any damage that is noted should be reported to the manufacturer/supplier immediately days in writing, supported with photographs.

1Supplier's consolidated delivery ticket is available, showing all equipment and ancillaries for inspection and being used to check against.
2A copy of the order that was sent to the supplier is available for reference and is being used to check against
3Equipment is packaged and crated in separate boxes for maximum protection
4The unit nameplate and details match the purchase order
5Delivery protection is dry
6Unit/s are dry internally
7The external casing of the unit/s are undamaged
8All frames, if ordered, are included
9All pipework connections are the correct size
10Pipework connections are undamaged
11All pipework handing's are correct
12All ventilation opening connections [supply & extract] are correct size.
13All ancillaries [valves, actuators, dampers, filters] are included in delivery as per the order and delivery note
14Spin the fan to ensure not damaged and out of line
15Check all coils for damage externally and internally
16Replace and protection that has been removed

Storage Inspection

Storage Area

If the equipment is to be placed into storage on site prior to installation, there will be an inspection completed checking the following.

1The area is internal and will not be affected by the weather. [if the unit is not rated for external use]
2The surface where the equipment is to be placed is flat.
3The equipment will be raised from the floor to allow airflow and stop the risk of water ingress.
4The area is well covered and protected.
5The area is well ventilated and has no risk of high humidity.
6The area is clean & dust-free.

Storage of CRAH Unit

Prior to the units being placed into storage, the following should be checked.

1Units will not be stacked.
2Units will not have materials stacked on them.
3All ancillaries will be placed in a safe and secure location so items do not go missing or get damaged.
4All original packaging is intact and not removed.
5Pipework caps are not removed.
6Unit and all components placed on a flat surface.
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Pre-Installation Inspection

Prior to the units being installed, the following should be checked.

1The plinth/base is ready, flat, and level & can bear the weight of the installation.
2The room/area is dry and watertight.
3The area being installed is not prone to flooding or ponding of water.
4The room/area the unit will be installed into is clean and dust-free. If there is dust/construction work, then the unit should be protected.
5The installation of the CRAH Unit will not impede the installation of the condensate trap/pipework.
6If any plenums are being installed on the CRAH Unit, there is enough space, and there will be no impact on other services.
7The air openings, supply, and return will not be blocked by any services, and the free area of the opening, as required by the manufacturer, is achievable.
8All connections, pipework/ductwork [where installed], can be independently supported and not supported by the units. The best practice is to install self-supporting brackets prior to the connection of the unit.
9Ensure that all access doors are clear and not blocked from brackets or other services.
10Check to ensure that all connection kits containing - gaskets, bolts, cleats, screws are available to allow bolting up of the equipment.
11Remove all transport feet and bolts.
12Check that all required cabling can be run through the unit and on appropriate containment.


1There is enough space allowed around and above the CRAH Unit once installed to perform maintenance and remove components. [check the manufacturer's maintenance instructions for requirements]
2All doors can be fully opened to gain access to the unit.
3Check that there is enough space for filters, coils, and fans to be removed and replaced.
4Confirm that there is a safe manner to remove the parts and components of the units and that there is enough space at high level and at the floor level to allow this.

CRAH UNIT Pre-Commissioning Inspection

Once the equipment has been installed and prior to the functional testing and commissioning phase taking place, the following will be checked.


1Document the information of each unit from its nameplate and cross-reference with the specified information to ensure correct.
2Ensure each unit is level.
3Ensure all gaskets are installed and sealed.
4Ensure that all cleats are installed as per the manufacturer's instructions.
5All-access doors can be open and closed with no gaps or leakage.
6Check that all transport bolts and feet are removed.
7All vibration mounts installed.
8Seismic restraints, where required, installed.
9Unit and all components, including valves and controls, are installed and labeled in line with the project naming convention.
10Operation and startup manual for the CRAH Unit available.

Electrical General

1Units and their components are fully earthed in line with the manufacturer's instructions.
2Earthing has been tested
3Emergency disconnect installed for each component in line with NFPA/local code requirements.
4Electrical voltage from the site matches the unit required voltages.
5All cabling is installed and connected on the correct containment/raceways and not damaged.
6All cabling has been tested/torque tested.
7A local motor control panel [LMCP] has been installed.
8The local motor control panel has been electrically tested.
9All electrical cabling is labeled in line with the project naming convention.

Variable Speed Drive

1A variable speed drive has been installed.
2Variable Speed Drive [VSD] has been electrically tested.
3Variable speed drive has been functionally tested.

Controls System/Motorized Dampers & Interlocks

1Motorized dampers installed as per the drawings and open/close freely.
2All controls and panels have been installed to operate the motorized dampers.
3Pressure independent commissioning valve has been wired and is setup
4Fire trip has been installed and operating/interlocked with the ventilation system.
5Pressure differential measuring devices are installed across all filters.
6Group Control, if required, is available. Including understanding of which is Master and Slave Units.
7Network switch installed and available.
8Temperature/humidity sensors are installed and calibrated back to the BMS head end.

Fire Dampers

1If fire dampers were installed as per the drawings, ensure they have been tested in line with the project requirements.

Panel Filters

1Filter mounting frames are clean and dust-free.
2Panel filters are installed, clean, and are of the correct grade.
3Filters have the correct sealing gaskets installed.
4The filters are not jammed in the rails.
5All components upstream of the filter are clean and dust-free.
6Panel filters are locked in place.
7Differential pressure sensors are installed and calibrated.

Supply Air Fans

1Electrical connections and cables are complete, fully tested, and torqued in line with project/manufacturer requirements.
2Motor protection installed and operating [Overload].
3Motor protections calibrated.
4Voltage from electrical systems is correct for the unit requirements.
5The fan housing is clean and dust-free.
6Fan, blades, and motors are clean and dust-free.
7Fan belt tension is correct.
8Fan belt condition is good.
9Ensure the fan is true and aligned correctly.
10Check the tightness of fixings [torque].
11Fan/motor rotates in the correct direction with no obstructions [by hand].
12Fan/motor rotates in the correct direction with no obstructions [electrically bump unit on].
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Cooling Coil

1The cooling coil is clean, in good condition, and the fins undamaged.
2Ensure that the pipework is connected and the correct size
3Ensure that the flow and return pipework handings are correct.
4The installation of the pipework will not put stress on the equipment connections or create vibrations.
5The materials used between the equipment and the chilled water system will not cause Electrolysis.
6Pipework that is to connect to the unit has been weld tested.
7Pipework that is to connect to the unit has been pressure tested.
8Pipework that is to connect to the unit has been cleaned and flushed.
9Equipment has been backflushed.
10The system has been bled and air removed.
11The chilled water system has been hydraulically balanced.
12Pipework is insulated and vapor sealed
13Insulation is labeled
14All pressure gauges installed and display scale as per design requirements.
15All valves/control valves are installed and in the correct direction
16All commissioning devices are installed
17Chiller is available and operating
18Chilled water pumps are available and operating
19The cooling tower is available and operating
20Condenser water pumps are available and operating

Electric Reheat Coil

1Operation of the reheat coil is fan controlled/interlocked
2Fan delay incorporated into the control's logic, allowing the fan to run [15 mins] after the heater has deactivated/switched off.
3Heater elements are clean and not obstructed by debris
4All electrical testing has been completed, including torque tests of connections.
5All safety components are connected and operational, including all thermostats to cut power to the heater if needed.
6All controls cabling is connected and installed in line with the manufacturers/design drawings.
7Power is available to the electric heater/control panel for operation.


1Unit is electrically connected with testing completed to electrical components.
2Humidifier internals are clean and clear of debris.
3Condensate pipework is installed [see condensate section].
4Coldwater feed is connected to the humidifier unit.
5Connections between the standalone unit and the humidifier are using the specific manufacturer's hoses
6The hoses and pipework that are connected are installed in line with the manufacturer's requirements. There are no tight bends or kinks.
7Metal clamps are used to connect the pipework between the humidifier and the standalone unit.
8Controls valves fitted and operating to allow cold water into the system.
9Check that the humidity sensor is calibrated.

Cold Water Feed

1Pipework pressure tested
2Pipework insulated and vapor sealed
3Insulation is labeled.
4All valves fitted and operating [isolation, non-return]

Condensate Pump / Condensate Pipework

1The condensate pump has been installed in line with the manufacturer's requirements.
2Condensate pipework connected.
3The condensate is installed to the correct fall.
4The size of the condensate is correct.
5If there are multiple coils installed on a unit, ensure the condensate pipework configuration is installed in line with the manufacturer's requirements.
6Ensure the drain pan is clean and free of debris.
7Condensate pipework has been flow tested.
8Pressurized part of the condensate pipework pressure tested.
9Pipework flow tested.
10Pipework insulated and vapor sealed, where required.
11Insulation is labeled.
12The pump is electrically connected with testing completed to electrical components.
13Controls are connected and available.
14Pump tested and operated in line with project requirements.

Supply Air Ductwork

1Where required, all supply air ductwork is installed, correct size, and connected to the unit with correct fixings
2Ductwork insulated and vapor seal in line with the specification.
3Test holes available in the duct to allow air readings

Hot / Cold Aisle Containment

1Where installed, Cold Aisle containment has been completed, including all doors, and there are no air gaps with the ceiling or panels.
2Where installed, Hot Aisle containment has been completed, including all doors, and there are no air gaps with ceiling or panels.
3All ceilings are completed, and there are no gaps.

CRAH UNIT Pre-Functional Checklist [PDF]

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