Open Loop Ground Water Systems - Geostar Aston Series Installation Manual

Open Loop Ground Water Systems

Typical open loop piping is shown below. Always maintain
water pressure in the heat exchanger by placing water control
valves at the outlet of the unit to prevent mineral precipitation.
Use a closed, bladder-type expansion tank to minimize mineral
formation due to air exposure. Ensure proper water flow through
the unit by checking pressure drop across the heat exchanger
and comparing it to the figures in unit capacity data tables in the
specification catalog. 1.5-2 gpm of flow per ton of cooling capacity
is recommended in open loop applications.
Discharge water from the unit is not contaminated in any manner
and can be disposed of in various ways, depending on local codes,
i.e. recharge well, storm sewer, drain field, adjacent stream or
Figure 9a: Open Loop Solenoid Valve Connection Option
Typical quick operating external 24V water solenoid valve
(type PPV100 or BPV100) wiring.
Acc Com
Acc NC
SV
Acc NO
Solenoid
Valve
NOTE: SW2-4 and SW2-5 should be "OFF" to cycle with
the compressor.
Figure 10: Open System - Groundwater Application
Unit Supply
Aux. Heat Supply
Disconnects
(If Applicable)
Compressor Low Voltage
Line Voltage to Thermostat
and Valve
Absorbing Pad
C
P1
R
1
P2
2
3
Flexible
Duct Collar
Rubber Bladder
Expansion Tank
Auxiliary
Heater
Knockout
Desuperheater
Connections
Solenoid
Drain
Strainer
Boiler Drains
P/T Plugs
For HX Flushing
Vibration
pond, etc. Most local codes forbid the use of sanitary sewer for
disposal. Consult your local building and zoning departments to
assure compliance in your area.
NOTE: For open loop/groundwater systems or systems that do not
contain an antifreeze solution, set SW2-Switch #1 to the "WELL"
(30°F) position. (Refer to the DIP Switch Settings table in the
Aurora Control section.) Slow opening/closing solenoid valves
(type VM) are recommended to eliminate water hammer.
Figure 9b: Open Loop Solenoid Valve Connection Option
Typical slow operating external 24V water solenoid valve
(type VM) wiring and one (1) quick operating valve.
VM Valve
NOTE: SW2-4 should be "ON" and SW2-5 should be "OFF" when
using a slow opening (VM) water valve.
Figure 9c: Modulating Water Valve Connection Option
Typical 0-10VDC modulating water valve.
Flow Control
Valve
(on outlet of
Solenoid Valve)
Valve
Water Out
Water In
Shut Off Valves
Shut Off Valves
(to isolate solenoid
valve while acid flushing)
11
ASTON SERIES INSTALLATION MANUAL
AXB BOARD
GND 1
24 VAC 2
0-10DC 3
ABC BOARD
C
R
Acc Com
ACC NC
Acc NO
C
R