INSTALLATION
CHILLER-IOM-2004-E
25
7.6.
Oil charge
All units are delivered with a complete oil charge, and there is no need to add any oil before start up or afterwards. When a compressor is
replaced and in the case of split units, it may be necessary, due to the length of piping installed, to add a certain amount of oil. Please refer
to the following oil tables. Overcharging with oil can cause serious problems on an installation, particularly for the compressors.
Oil Recommendation for LENNOX chillers
Refrigerant
Compressor type
Brand
Oil Type
R410A
Scroll ZP
Copeland
ICI EMKARATE RL32-3MAF or for refill MOBIL EAL
Arctic22CC
7.7.
Air cooled condensers
An air cooled condenser connected to a unit must have the same number of circuits as the unit. Selection of the condenser must be made
carefully to enable transfer of the heat capacity of the unit even at the highest temperatures expected on an installation.
It is mandatory to control the head pressure in order to enable the unit to operate properly whatever the season:
A variety of different systems may be used, but the most simple and efficient of these modulates fan operation using a pressure or
temperature control.
Verify the defrost cycle with 4-way valve Switch the unit to heat pump mode.
For condensers fitted with a small number of fans (1 or 2), it may be necessary to vary the fans speed.
Head pressure control systems that operate by flooding the condenser with liquid refrigerant should be avoided, because they require very
high refrigerant loads and can cause serious problems if they are not properly regulated.