Trane GEH 006 Manual page 138

Pump Module
The pump module and hose kit make a
complete self-contained pumping
package for distributed pumping sys-
tems. These kits contain all the neces-
sary components for the installation,
operation and maintenance of the wa-
ter circuit of a closed loop geothermal
application. Standard pump module
features include insulated Grundfos
pumps, insulated cabinet, bronze or
cast iron pump, and 3-way brass
valves. The module is factory piped,
wired and mounted. See Figure 55
for pump module assembly. Literature
number WSHPC-IN-5 (72-9006-03) will
provide electrical and dimensional re-
quirements for the PMCA and PMBA
products.
Figure 55: Pump module
Pump Module Hose Kit
The pump module hose kit consists of
two brass, 3/4 or 1-inch male pipe
thread (MPT) -by-barb fittings; two
brass 90 degree 1-inch, MPT-by-barb
elbows with pressure/temperature
ports; and 10 feet of rubber hose with
4 hose clamps. The pump module
hose kit is available separately from
the pump module. See Figure 56 for
pump module hose kit.
138
Accessories
Figure 56: Pump module hose kit
Water Regulating Valve
Assembly
The water regulating valve assembly
consists of a direct acting valve and a
reverse acting valve installed on the
water-out side of the unit. The valve
connection sizes shall range from 1/2"
to 1 1/2" FPT. The direct acting valve
opens in response to an increase in
discharge pressure during the cooling
cycle. The reverse acting valve opens
in response to a decrease in suction
pressure during the heating cycle. Wa-
ter regulating valves should be used
where low flow and low or high fluid
temperature conditions could occur.
See Page 38 of this manual for applica-
tion information.This option is benefi-
cial with open loop systems, but not
necessary. See
Figure 57 for water regulating valve
assembly.
Figure 57: Water regulating valve
Note: A water regulating valve con-
nection is not available on the 12 1/2
through 25 ton unit sizes.
Motorized Water Valve
The motorized water valve is installed
on the return line of the water loop
system between the loop and the
loop's pump module. This isolation
device is less expensive and a very ef-
fective alternative to the water regulat-
ing valve.
When the compressor begins running,
the valve will open, allowing water to
flow through the unit. As the compres-
sor shuts down, the valve slowly clos-
es off. The main purpose of the
motorized valve is to shut-off the flow
of water through the unit when the
unit is off, thus reducing water con-
sumption. The motorized valve is fast
opening to prevent compressor
trip-out, and slow closing to prevent
water hammer. See Figure 58 for mo-
torized water valve.
Figure 58: Motorized water valve
WSHP-PRC001-EN