CRAH UNIT | Pre-Functional CheckList

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.

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

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

Storage of CRAH Unit

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

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

Pre-Installation Inspection

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

Ref	Inspection/Task
1	The plinth/base is ready, flat, and level & can bear the weight of the installation.
2	The room/area is dry and watertight.
3	The area being installed is not prone to flooding or ponding of water.
4	The 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.
5	The installation of the CRAH Unit will not impede the installation of the condensate trap/pipework.
6	If any plenums are being installed on the CRAH Unit, there is enough space, and there will be no impact on other services.
7	The 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.
8	All 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.
9	Ensure that all access doors are clear and not blocked from brackets or other services.
10	Check to ensure that all connection kits containing - gaskets, bolts, cleats, screws are available to allow bolting up of the equipment.
11	Remove all transport feet and bolts.
12	Check that all required cabling can be run through the unit and on appropriate containment.

Maintenance/Access

Ref	Inspection/Task
1	There 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]
2	All doors can be fully opened to gain access to the unit.
3	Check that there is enough space for filters, coils, and fans to be removed and replaced.
4	Confirm 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.

General

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

Electrical General

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

Variable Speed Drive

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

Controls System/Motorized Dampers & Interlocks

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

Fire Dampers

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

Panel Filters

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

Supply Air Fans

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

Cooling Coil

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

Electric Reheat Coil

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

Humidifier

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

Cold Water Feed

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

Condensate Pump / Condensate Pipework

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

Supply Air Ductwork

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

Hot / Cold Aisle Containment

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

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CRAH UNIT Pre-Functional Checklist [PDF]

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CRAH Unit Pre-Functional Checklists [Microsoft Word]

CRAH Unit Pre-Functional Checklists [Microsoft Excel]

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