HVAC Line Installation

Always carry out the following procedure before connecting any hose or pipe:

• All refrigeration fittings require oiling with the recommended refrigerant oil before installation.
• When connecting refrigeration fittings, make sure that the O-ring is positioned correctly. Push the joint together until the O-ring disappears before attempting to tighten the nut. The nut should start by hand. If a wrench is required, then the joint is misaligned. Tighten the joint to the torque shown.
• The air conditioner refrigeration system must be kept clean and capped at all stages. At no time must any hoses be left open to atmosphere as the oil in the system is hygroscopic (absorbs moisture). The connection to the drier should only be completed just prior to commissioning, or at least the air conditioning system should be vacuumed to keep the system dry so any moisture generally in the pipe work does not affect the oil or 'wet' the receiver drier.
• Keep the lid on oil containers such that a small amount can be dispensed at any time and then at the end of the week, the whole can is disposed of to avoid using contaminated oil. Oil containers kept to lubricate O-rings should not be used to top up oil in the air conditioning systems due to potential contamination.

Use the HVAC machine to perform a leak test after a major repair has been completed.