General • Inspections

Manhattan Modular Chiller: Monthly Maintenance

Preventive maintenance is a simple and cost-effective way to ensure your HVAC system is running at peak efficiency and to catch problems before they get serious.

MaintainX

08/10/2022

Manhattan Modular Chiller: Monthly Maintenance

Preventive maintenance is a simple and cost-effective way to ensure your HVAC system is running at peak efficiency and to catch problems before they get serious.

Maintenance

! WARNING

Hazardous Service Procedures!

Failure to follow all precautions in this manual and on the tags, stickers, and labels could result in death or serious injury.

Technicians, in order to protect themselves from potential electrical, mechanical, and chemical hazards, MUST follow precautions in this manual and on the tags, stickers, and labels, as well as the following instructions: Unless specified otherwise, disconnect all electrical power including remote disconnect and discharge all energy storing devices such as capacitors before servicing.

Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized. When necessary to work with live electrical components, have a qualified licensed electrician or other individual who has been trained in handling live electrical components perform these tasks.

Periodic Maintenance

Perform all of the indicated maintenance procedures at the intervals scheduled. This will prolong the life of the unit and reduce the possibility of costly equipment failure. All maintenance tasks other than recording data must be performed by a qualified service technician.

Monthly Maintenance

Ensure the unit has been operating for about 10 minutes and the system has stabilized, check operating conditions and complete the checkout procedures that follow.

Check compressor oil levels. Oil should be visible in the sight glass when the compressor is running. Operate the compressors for a minimum of three to four hours when checking oil level, and check level every 30 minutes. If oil is not at proper level after this period, have a qualified service technician add or remove oil as required.
Check refrigerant superheat at the compressor suction line. Superheat should be in the range of 10°F–20°F.
Note: A superheat calculated value is incorporated into the unit controller.
Check the liquid line sight glasses
If operating pressures and sight glass conditions seem to indicate refrigerant shortage, measure system superheat and system sub-cooling.
If operating conditions indicate an overcharge, slowly (to minimize oil loss) remove refrigerant at the liquid line service valve. Do not release refrigerant to the atmosphere.
Inspect the entire system for unusual conditions. Review the weekly operating log for conditions history for the unit and take note of any unusual trends in performance. Take appropriate preventative actions if necessary.

Source: MaintainX (Community Member)

Maintenance

! WARNING

Hazardous Service Procedures!

Failure to follow all precautions in this manual and on the tags, stickers, and labels could result in death or serious injury.

Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized. When necessary to work with live electrical components, have a qualified licensed electrician or other individual who has been trained in handling live electrical components perform these tasks.

Periodic Maintenance

Perform all of the indicated maintenance procedures at the intervals scheduled. This will prolong the life of the unit and reduce the possibility of costly equipment failure. All maintenance tasks other than recording data must be performed by a qualified service technician.

Monthly Maintenance

Ensure the unit has been operating for about 10 minutes and the system has stabilized, check operating conditions and complete the checkout procedures that follow.

Check refrigerant superheat at the compressor suction line. Superheat should be in the range of 10°F–20°F.

Note: A superheat calculated value is incorporated into the unit controller.

Check the liquid line sight glasses

If operating pressures and sight glass conditions seem to indicate refrigerant shortage, measure system superheat and system sub-cooling.

If operating conditions indicate an overcharge, slowly (to minimize oil loss) remove refrigerant at the liquid line service valve. Do not release refrigerant to the atmosphere.

Inspect the entire system for unusual conditions. Review the weekly operating log for conditions history for the unit and take note of any unusual trends in performance. Take appropriate preventative actions if necessary.