Bryant 50YEW Design Manual page 61

Wiring Diagrams
Table 4-1 shows the various combinations of water-to-water units
and typical applications. Following the table are 50YEW wiring
diagrams and 50PSW/GSW wiring diagrams.
Table 4-1: Wiring Diagram Matrix
Chilled Water
Heat Pump
Cooling
50YEW N/A
50YEW N/A
50YEW N/A
50YEW N/A
50YEW N/A
50YEW N/A
50YEW N/A
50YEW N/A
50PSW/GSW No
50PSW/GSW No
50PSW/GSW No
50PSW/GSW Yes
50YEW Series
Wiring diagrams for the 50YEW series are shown below. A
12-point terminal strip (shaded in gray) provides connections for
thermistors and other external devices used for controlling the
hydronic heating system and separate forced air cooling unit.
Bryant Geothermal Heat Pump Systems
Sep W-A Unit
DHW Tank
for Cooling
No Indirect
No Direct
No Indirect
No Direct
Yes Indirect
Yes Direct
Yes Indirect
Yes Direct
No Indir or Dir
Yes Indir or Dir
Yes Indir or Dir
No Indir or Dir
Water-to-Water System Design Guide
Part IV: Controls / Wiring Diagrams
W-W Unit W-W Unit
Source Pumps Load Pumps
Internal Internal
Internal Internal
External External
External External
Internal Internal
Internal Internal
External External
External External
External External
External External
External External
External External
50PSW/GSW Series
The 50PSW and GSW series water-to-water heat pumps require
external controls for hydronic heating. If outdoor temperature
reset is not required, a simple aqua-stat can control the heat pump.
If more complex control strategies are required, however, Bryant
recommends the 50YEW series or an external microprocessor-
based controller like those manufactured by Tekmar. Due to
the many possible applications for water-to-water heat pumps, the
drawings below show only simple, aqua-stat type control wiring, and
cannot be considered all-encompassing.
W-A Unit Wiring
Source Pumps Diagram
N/A 4-1
N/A 4-1, 4-2
N/A 4-3
N/A 4-3, 4-2
External 4-4
External 4-4, 4-2
External 4-5
External 4-5, 4-2
N/A 4-6
External 4-7
N/A 4-8
N/A 4-9
59