11
Residential Packaged Units - 60Hz Puron
®
Rev.: 4 Jan., 2012
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.
Water Connections-Residential (Distributor) Models
Residential models utilize swivel piping fi ttings 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
fl ush end of most 1” threaded male pipe fi ttings provides
a leak-free seal without the need for thread sealing tape or
joint compound. Insure 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.
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 fi ttings should not be used at any time
due to their tendency to corrode. All plastic to metal threaded
fi ttings should be avoided due to their potential to leak in earth
coupled applications. A fl anged fi tting should be substituted.
P/T plugs should be used so that fl ow 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 backfi lling.
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 fi nal
purging and charging. A fl ush cart with at least a 1.5 hp
[1.1 kW] pump is required to achieve enough fl uid velocity
in the loop piping system to purge air and dirt particles. An
GROUND-LOOP HEAT PUMP APPLICATIONS
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!
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.
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