Tranquility THW - 50 & 60Hz R410A - ClimateMaster Geothermal Heat Pumps - Rev.: 30 June, 2008B
11
Figure 3: Typical Earth Loop Connection.
Antifreeze may be added before, during, or after the flushing
procedure. However, depending upon which time is chosen,
antifreeze could be wasted when emptying the flush cart
tank. See antifreeze section for more details. Loop static
pressure will fluctuate with the seasons. Pressures will be
higher in the winter months than during the cooling season.
This fluctuation is normal and should be considered when
charging the system initially. Run the unit in either heating
or cooling for a number of minutes to condition the loop
to a homogenous temperature. This is a good time for
tool cleanup, piping insulation etc. Then final flush and
pressurize the loop to a static pressure of 40-50 psi [275-
345 kPa] (winter) 15-20 psi [100-138 kPa] (summer).
After pressurization, be sure to remove the plug in the
end of the Grundfos loop pump motor(s) to allow trapped
air to be discharged and to insure the motor housing has
been flooded. This is not required for Taco circulators.
Insure the loop flow center provides adequate flow
through the unit by checking pressure drop across the
heat exchanger and comparing it to the figures shown in
Table 7.
Antifreeze
In areas where minimum entering loop temperatures drop
below 40°F [4.4°C] or where piping will be routed through
areas subject to freezing, antifreeze is needed. Alcohols
and glycols are commonly used as antifreezes, however
your local territory manager should be consulted for the
antifreeze best suited to your area. Freeze protection
should be maintained to 15°F [-9.4°C] below the lowest
expected entering loop temperature. For example, if
30°F [-1.1°C] is the minimum expected entering loop
temperature, the leaving loop temperature would be
25-22°F [-3.9 to -5.6°C] and freeze protection should be
at 15°F [-9.4°C] (30°F-15°F=15°F). All alcohols should
be premixed and pumped from a reservoir outside of the
building when possible or introduced under water level
to prevent fuming. Initially calculate the total volume of
fluid in the piping system using Table 3. Then use the
percentage by volume shown in Table 4 for the amount of
antifreeze. Antifreeze concentration should be checked
from a well mixed sample using a hydrometer to measure
specific gravity.
Low Water Temperature Cut-Out Setting
When an antifreeze is selected the low temperature limit
setpoint should be switched to the lower setting to avoid
nuisance faults. Consult
Low Water Temperature Cut-
Out Setting
in the controls section for more information.
GROUND-LOOP HEAT PUMP APPLICATIONS
To/From Ground Loop
THW
Source HX
(coaxial)
Load HX
IN
OUT
NOTES:
1. P/T (pressure/temperature) ports are internal for THW
series units.
2. Source water piping must be insulated for closed loop
installations.
3. Other components (additional ball valves, unions, etc.)
may be required for ease of service. This drawing
shows only minimum requirements. Your specific
installation will dictate final component selections.
4. Local code supercedes any piping arrangements or
components shown on this drawing.
Flow Controller
02Nov07
See drawings in Application manual for Load connections
P/T port
Sound absorbing pad
