Bryant 50YEW Design Manual page 39

Drawing 3-5 – Heating with water-to-water unit and cooling
with water-to-air unit application – water-to-water units with
optional internal source pump(s) / separate pump(s) for each
unit: Drawing 3-5 is used for water-to-water units with optional
internal source pumps. A combination of ball valves as shown in
the drawing is required 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 at
Drawing 3-5: 50YEW Source Piping (Internal Source
Pumps) - Separate Water-to-Air Cooling System
See drawings in section 2 for Load connections
Load HX
Bryant Geothermal Heat Pump Systems
Part III: Source Side Design / System Selection
To/From Ground Loop
Note 2
Note 1
Note 4
IN OUT
Notes 2,3
50YEW
Unit
Source HX
(coaxial)
Water-to-Water System Design Guide
each unit to prevent short 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.
Water-to-Air
Unit
(Cooling)
Notes 4,5
Water Out
Water In
P/T Port
NOTES:
1. Ball valve arrangement is for purging air from the
ground loop.
2. Pump selection (1 or 2) will be determined by size of
water-to-air and water-to-water units.
3. P/T (pressure/temperature) ports are internal for
50YEW series units.
4. Source water piping/components must be insulated for
closed loop installations.
5. Unions are not necessary if residential swivel water
connections (60Hz units only) are used.
6. 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.
7. Local code supercedes any piping arrangements or
components shown on this drawing.
14Sep07
37