Flare nut
Cap
Valve body
Valve stem
3-way (Gas) Valve of
a circuit.
18. Power up the system, and run the indoor unit for
circuit A in COOLING mode to assure that all functions
are working.
19. Switch the indoor unit of circuit A to HEAT mode
and assure that all functions are working.
20. Set the temperature on remote to HIGHEST setting
and while the unit is running in heat mode, check one
last time for leaks at all 4 related pipe connections of
circuit A. It is easier to catch even smallest leaks in HEAT
mode as the pressures are much higher.
21. If you discover a leak that cannot be stopped by
tightening the flare nuts at this stage, shut off both
2 way (liquid) and 3 way (Gas) service valves, repair the
leak properly and start from the beginning. Please
remember you may need to add fresh refrigerant to the
system as a significant value may be lost at this stage.
22. REPEAT THIS ENTIRE PROCEDURE FOR THE
REMAINING CIRCUITS. Skip if a circuit is not being
utilized by an indoor unit. In case an indoor unit is
added in the future, the same procedure should be
followed for that circuit entirely.
ADDING REFRIGERANT IF THE TOTAL
REQUIRED VOLUME EXCEEDS THE
STANDARD FACTORY PRE-CHARGE
Your system is pre-charged with sufficient refrigerant to
work properly, according to an average length of 7.5 meter
(25 feet) piping for each of the available circuits (example
a 4 zone system can have total piping length for all zones
added together of 30 meters (100 feet) max. If your total
piping length exceeds this limit, additional refrigerant
must be added to the system to compensate for the
difference (0.16 Ozs per additional foot for 1/4” Liquid pipe
and 0.32 Ozs per additional foot for 3/8” Liquid pipe)
PROCEDURE FOR 2, 4 AND 5 ZONE OUTDOOR UNITS ARE
DIFFERENT FROM 2 ZONE MODELS. See Specific
instructions below for each type as it applies to your model.
1. For Dual (2 Zone) systems, connect the low pressure hose
on your gauge manifold (usually blue) to the 3-way (Gas)
valve’s service port of one of the occupied circuits
(Circuit A preferred). See below drawing.
Page 23
2. For 3, 4 and 5 zone systems, connect the low
pressure hose from the gauge manifold set (this is
usually the blue hose on most sets) to the 3-way
(Gas) service valve of the Common (master) circuit.
See below drawing.
3. Connect the center hose of the gauge manifold
to the refrigerant container (this is usually the
yellow hose on most sets). Refrigerant 410A can
only be charged in Liquid form while the container
must be inverted (upside down). Note that all
2-way (Liquid) and 3-way (Gas) valves for all
“occupied” circuits where an indoor unit is
attached must be in the open position.
Additionally, for 3, 4 and 5 circuit models, the
common (master) 2-way (Liquid) and 3-way (Gas)
valves must also be in open position.
4. The air trapped in the gauge manifold and the
hoses must be purged out. Use the pressure from
the system to purge the low side hose, by briefly
loosening its connection at the gauge manifold for
a second. Next, open the valve of the refrigerant
container to pressurize the center hose and loosen
the connector of the center hose at the gauge
manifold for a second and purge that line.
5. Determine the volume of the additional
refrigerant added into the system for the
additional piping.
