R e s i d e n t i a l H & V - 6 0 H z H F C - 4 1 0 A :
R e v : O c t o b e r 5 , 2 0 2 1
14
G e o t h e r m a l H e a t i n g a n d Co o l i n g
Water Connection Installation
External Flow Controller Mounting
The Flow Controller can be mounted beside the unit as
shown in Figure 12. Review the Flow Controller installation
manual for more details.
Gasket
Swivel Nut
Stainless steel
snap ring
Brass Adaptor
Hand Tighten
Only!
Do Not
Overtighten!
Figure 11: Water Connections
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
The typical closed loop ground source system is shown in
Figure 12. 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 per ton [2.41
to 3.23 l/m per kW] of cooling capacity is recommended in
these applications.
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
Once piping is completed between the unit, Flow Controller
and the ground loop (Figure 12), the loop is ready for final
purging and charging. A flush cart with at least a 1.5 hp [1.1
kW] pump is required to achieve enough fluid velocity in the
loop piping system to purge air and dirt particles.
GROUND-LOOP HEAT PUMP APPLICATIONS
⚠
CAUTION!
⚠
High and
Low Voltage
Knockouts
Vibration Isolation Pad
To Thermostat
Figure 12: Typical Ground-Loop Application
CAUTION!
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.
Water Connections
Swivel piping fittings are used for water connections that
are rated for 450 psi (3101 kPa) operating pressure. The
connections have a rubber gasket seal similar to a garden
hose gasket, which when mated to the flush end of most 1”
threaded male pipe fittings provides a leak-free seal without
the need for thread sealing tape or joint compound. Check
for burrs and ensure that the rubber seal is in the swivel
connector prior to attempting any connection (rubber seals
are shipped attached to the swivel connector). DO NOT
OVER TIGHTEN or leaks may occur.
The female locking ring is threaded onto the pipe threads
which holds the male pipe end against the rubber gasket,
and seals the joint. HAND TIGHTEN ONLY! DO NOT
OVERTIGHTEN!
