Owner Manual

the importance of proper maintenance and the maintenance schedule for checking/changing the
filter installed. Most air filters require monthly attention.
5.3 Construction / Remodeling
The Geocool unit should NEVER be run during any kind of construction or remodeling that
would allow drywall, hard wood, or any kind of dust to be pulled in the system. Even with extra
filtering dust particles can accumulate in the duct system causing unwanted dust for years to
come. It can also cause air coil clogging, condensate drain clogging, blower dust accumulation
and many other problems to the system. Running the system during construction / remodeling
will VOID the system warranty
6.0 The Ground Loop System
6.1 Closed Loop Systems Plumbing
IMPORTANT! Do NOT use PVC or CPVC piping on any connections to your Geocool unit. The
only exception where PVC or CPVC piping may be used is on the condensate lines.
Closed loop systems will require a minimum of 3 G.P.M. per ton if the ground loop is designed
to maintain a loop temperature above 32ºF and below 90ºF. If design temperatures are outside
of these temperatures more flow will be needed.
On residential units, a pump is typically required for each unit. The loop pump requirement will
depend upon the loop design for a given application. The ground loop piping system must
provide suitable access for purging the outside loop and require isolation valves for purging the
inside plumbing including the unit. To properly purge a closed loop system, a minimum velocity
of 2 feet per second in every branch of the ground loop must be achieved. The purge ports can
also be used for anti-freeze charging.
IMPORTANT NOTICE: UNITS THAT UTILIZE GROUND LOOPS MUST MAINTAIN A
MINIMUM OF 20% METHANOL OR 25% PROPYLENE GLYCOL AS ANTIFREEZE
SOLUTION IN THE UNIT AND GROUND LOOP AT ALL TIMES. FAILURE TO DO SO WILL
FREEZE THE SYSTEM AND CAUSE SEVERE DAMAGE TO THE UNIT. DAMAGE TO THE
UNIT CAUSED BY THE FAILURE TO MAINTAIN PROPER ANTIFREEZE LEVELS IS NOT
COVERED UNDER THE WARRANTY.
6.2 Purging the Closed Loop
Purging of the closed loop and unit should only be done after it has passed the air pressure
check and all leaks have been repaired. Purging requires a high velocity pump and should only
be done by the installing dealer or sub-contractor. See drawing below for piping example.
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