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Central Pump
Application
Ball valves should be installed
in the supply and return lines
for unit isolation and unit water
flow rate balancing (if an auto-
matic flow device is not
selected). This connection,
along with hoses, are also rec-
ommended for backflushing
and chemical cleaning of the
water to refrigerant heat
exchanger.
Flexible hoses may be used
to connect the water supply
and return lines to the water
inlets and outlets. These hoses
reduce possible vibration
between the unit and the rigid
system.
Note: Hoses and or pipes
should be made of braided
stainless steel, and sized suit-
ably for the systems water
pressure and flow rate.
Load side connections are
typically used to supply the ter-
minal devices with 45 F or
120 F fluid.
The sound attenuation pad
should be slightly oversized for
unit. This field supplied product
is recommended for sound
absorption of unit.
The low voltage control con-
nection provided on the unit is
large enough for attaching con-
duit.
The central systems supply
and return lines should be
sized to handle the required
flow with a minimum pressure
drop.
Note: Pipe will sweat if low
temperature water is run
through the supply or return
lines. Trane recommends that
these lines be insulated to pre-
vent damage from condensa-
tion.
The field supplied line voltage
disconnect should be
installed for branch circuit pro-
tection. The unit is supplied
with an opening for attaching
conduit.
Central
Pumping
System
Application
Considerations
General
A central pumping system involves
a single pump design usually locat-
ed within a basement or mechanical
room to fulfill pumping requirements
for the entire building system. With
a central pumping system, an auxil-
iary pump is typically applied to
lessen the likelihood of system
down-time if the main pump mal-
functions.
(See Figure 10 for unit installation of
a central pumping system).
Figure 10: Central pumping system installation
