Troubleshooting Guide

(An electronic leak detector will be more efficient
to use for this if available).
14. Re-insert proper size Allen wrench into the valve
core of the Liquid Valve (2 way) valve for circuit
A and turn it counter clockwise until it is fully back
seated. Do not force it, once it stops turning.
Repeat the leak checking procedure entirely at
all connections of circuit A. If you find a new leak,
close the 2-way (Liquid) valve you just opened
first and tighten the flare nut at the leaking
connection until the leak is sealed. Reopen the
2-way (Liquid) valve and check again.
15. Remove the 3-way (Gas) Valve’s dust cap for
circuit A. Insert proper size Allen wrench into the
valve core and turn it counter clockwise until it is
fully back seated. Do not force it, once it stops
turning.
16. Power up the system, and run the indoor unit for
circuit A in COOLING mode to assure that all
functions are working.
17. Switch the indoor unit of circuit A to HEAT mode
and assure that all functions are working.
18. 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.
19. 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.
20. REPEAT THIS ENTIRE PROCEDURE FOR
THE CIRCUIT B, if it is being utilized by a
second indoor unit.
5.4.2. FOR THREE, FOUR and FIVE ZONE
SYSTEMS):
Indoor units and the pipes between indoor and
outdoor units must be evacuated and leak tested to
remove trapped air and moisture from the system.
This procedure should start after all electrical
connections are finalized and the system receives
proper power for the test running.
PROCEDURE FOR 2, 4 AND 5 ZONE OUTDOOR
UNITS ARE DIFFERENT FROM 2 ZONE MODELS.
For installation convenience, one set of COMMON
(or MASTER) Service valves have been adopted
into the 3, 4 and 5 zone systems. The common
(master) set of service valves control the common
refrigerant circuitry behind the standard sets of
circuit service valves, where the indoor units are
attached. See the red circles on the picture below.
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Picture shows the 5 circuit model where the
Common (Master) valves are located to the left of
the area assigned for the circuit service valves.
Layout for the 3 and 4 circuit models are similar but
the Common (Master) valves are located at the top
of the area assigned for the circuit valves.