Trane 120 GEH Operation Manual page 27

Distributed Pumping System
A distributed pumping system contains
either a single or dual pump module,
specifically sized for each water-source
heat pump, then connected directly to
the units supply and return lines.
The distributed system's supply and
return lines should be sized to handle
the required flow with a minimum pres-
sure drop.
1. Hose kits are used to connect the
water supply and return line to the
water inlets and outlets. Trane offers
various hose kit combinations to
better facilitate system flow balanc-
ing. These flexible hoses also aid in
the reduction of vibration between
the unit and the rigid central piping
system.
2.The unit's (item 2) 3/4-inch high
3. voltage and (item 3) 1/2-inch low
voltage connections are located on
the left chamfered corner of the unit.
They are designed to accept conduit.
4.A field supplied line voltage
disconnect should be installed for
branch circuit protection. Check local
codes for requirements.
5.Trane's self-contained pump module
and hose kit make a complete pump-
ing package for distributed pumping
systems. The module is designed for
circulating commercial loops that
require a maximum flow rate of
20 gpm (76 lpm). Each pump module
is fully assembled for connection to
water and electrical points. The kit
contains all of the necessary
components for the installation,
operation and maintenance of a
closed loop application.
See WSHPC-IN-5 (72-9006-03) for
electrical and dimensional require-
ments
6.The distributed pumping system
supply and return lines should be
WSHP-PRC003-EN
Application
Considerations
sized to handle the required flow with
a minimum pressure drop.
Note: Pipe will sweat if low tempera-
ture water is below the dew point of the
surrounding space. Trane recommends
that these lines be insulated to prevent
damage from condensation when con-
denser loop is designed to be below
60 F/ 16 C. Equipment installed in
attic/crawl space temperatures below
40 F/ 4 C may require antifreeze in the
water loop.
Figure 32: Distributed pumping system installation.
7. For acoustically sensitive areas, a six-
inch deep fiberglass insulation is
recommended to be field installed
below the horizontal unit. This field
supplied insulation should be
approximately twice the footprint size
of the unit. It provides sound
damping of the unit while in
operation.
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