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TranquiliTy® 24 (SZ) VErSaTilE SEriES– iOM
Models:
SZ
Ground-Loop Heat Pump Applications
024-060
The following instructions represent industry accepted installation
practices for closed loop earth coupled heat pump systems. Instructions
are provided to assist the contractor in installing trouble free ground
loops. These instructions are recommendations only. State/provincial
and local codes MUST be followed and installation MUST conform to ALL
applicable codes. It is the responsibility of the installing contractor to
determine and comply with ALL applicable codes and regulations.
Ground loop applications require extended range equipment and
optional refrigerant/water circuit insulation.
PRE-INSTALLATION
Prior to installation, locate and mark all existing
underground utilities, piping, etc. Install loops for new
construction before sidewalks, patios, driveways, and
other construction has begun. During construction,
accurately mark all ground loop piping on the plot
plan as an aid in avoiding potential future damage
to the installation.
PIPING INSTALLATION
All earth loop piping materials should be limited
to polyethylene fusion only for in-ground sections
of the loop. Galvanized or steel fittings should
not be used at any time due to their tendency to
corrode. All plastic to metal threaded fittings should
be avoided due to their potential to leak in earth
coupled applications. A flanged fitting should be
substituted. P/T plugs should be used so that flow
can be measured using the pressure drop of the unit
heat exchanger.
Earth loop temperatures can range between 25
and 110°F [-4 to 43°C]. Flow rates between 2.25
and 3 gpm [2.41 to 3.23 l/m per kW] of cooling
capacity is recommended in these applications.
Table 3: Antifreeze Percentages by Volume
Type
Methanol
100% USP food grade Propylene Glycol
Ethanol*
* Must not be denatured with any petroleum based product
PA G E : 2 8
C r e a t e d : J a n u a r y 1 8 , 2 0 2 4
CAUTION
CAUTION
10°F [-12.2°C]
25%
38%
29%
Test individual horizontal loop circuits before
backfilling. Test vertical U-bends and pond loop
assemblies prior to installation. Pressures of at least
100 psi [689 kPa] should be used when testing. Do not
exceed the pipe pressure rating. Test entire system
when all loops are assembled.
FLUSHING THE EARTH LOOP
Upon completion of system installation and testing,
flush the system to remove all foreign objects and
purge to remove all air.
In areas where minimum entering loop temperatures
drop below 40°F [5°C] or where piping will be routed
through areas subject to freezing, antifreeze is
required. Alcohols and glycols are commonly used
as antifreeze; however your local sales office should
be consulted to determine the antifreeze best suited
to your area. Freeze protection should be maintained
to 15°F [9°C] below the lowest expected entering
loop temperature. For example, if 30°F [-1°C] is the
minimum expected entering loop temperature, the
leaving loop temperature would be 22 to 25°F [-6 to
-4°C] and freeze protection should be at 15°F [-10°C].
Calculation is as follows:
30°F - 15°F = 15°F [-1°C - 9°C = -10°C].
All alcohols should be premixed and pumped
from a reservoir outside of the building when
possible or introduced under the water level
to prevent fumes. Calculate the total volume
of fluid in the piping system. Then use the
percentage by volume shown in the table
below for the amount of antifreeze needed.
Antifreeze concentration should be checked
from a well mixed sample using a hydrometer
or refractometer to measure specific gravity.
Minimum Temperature for Low Temperature Protection
15°F [-9.4°C]
21%
25%
25%
ANTIFREEZE
20°F [-6.7°C]
25°F [-3.9°C]
16%
10%
22%
15%
20%
14%
w w w. c l i m a t e m a s t e r. c o m
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