Bryant 50YEW Design Manual page 37

Drawing 3-3 – Heating with water-to-water unit and cooling
with water-to-air unit application – units without internal source
pump(s) / separate Flow Controllers for each unit: Drawing 3-3
is used for water-to-water units without internal source pumps.
The Bryant Flow Controller includes one or two circulator pumps,
plus 3-way valves for purging air from the system. The use of
a separate water-to-air unit for cooling is the Bryant preferred
application when cooling is required (drawings 3-3, 3-4, and 3-5).
This application provides better and simpler control of the heating
and cooling system. Plus, pumps can be sized specifi cally for each
unit's fl ow rate (except drawing 3-4). Check valves are required
on the loop side of the Flow Controller piping to prevent short
Drawing 3-3: Water-to-Water Source Piping -
50YEW (No Source Pumps) or 50PSW / GSW Units
- Water-to-Air Cooling with Separate Loop Pumps
(Bryant Preferred System When Cooling
is Desired)
See drawings in section 2 for Load connections
Bryant Geothermal Heat Pump Systems
Part III: Source Side Design / System Selection
cycling (i.e. bypassing the ground loop). In cases where the water-
to-water unit will be generating domestic hot water in the summer
when the water-to-air unit is operating, a mixing valve may be
required to ensure that the entering source water temperature
to the water-to-water unit is not warmer than the maximum
temperature shown in the performance catalog (50PSW/GSW
units only). It is important to note that when headering the
ground loop outside of the mechanical room the header must be
a reducing type in order to be able to purge air from the system at
the Flow Controller 3-way valves. Reducing headers are addressed
later in this section.
Flow Controller
P/T Port
OUT IN
50YEW,
50PSW,
or GSW Unit
Load HX Source HX
(coaxial)
Water-to-Water System Design Guide
To/From Ground Loop
Note 4
Flow Controller
Notes 2,3
P/T Port
Note 1
NOTES:
1. P/T (pressure/temperature) ports are internal for
50YEW series units.
2. Unions are not necessary if residential swivel water
connections (60 Hz only) are used.
3. Source water piping must be insulated for closed loop
installations.
4. Pump selection (1 or 2) will be determined by size of
water-to-air and water-to-water units.
5. 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.
6. Local code supercedes any piping arrangements or
components shown on this drawing.
Water-to-Air
Unit
(Cooling)
Water Out
Water In
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