Open Loop Groundwater Systems - WaterFurnace AT022C/D Installation And Maintenance Manual

Figure 8- Premier 2 Slave Hook-up
Premier 2 Unit #1
SL1
Shut
C C
In
Down
With pump
wired to
Unit 1
SL1 SL1
Shut
C C
In Out
Down
Premier 2 Unit #2
Two Premier 2 units
Open Loop
Groundwater
Systems
Figure 9 - Open System: Groundwater Application
8
PREMIER 2 SINGLE-SPEED INSTALLATION AND MAINTENANCE MANUAL
SL1 Not Not
Shut
Out Used Used
Down
With pump
wired to Unit 1
With pump
wired to
Unit 2
Not Not
G L1
Used Used
Premier or Spectra Unit #2
One Premier 2 unit and one
Premier AT or Spectra unit
(with optional circut board)
OPEN LOOP SYSTEMS
NOTE: For open loop/groundwater systems or systems that do not contain an antifreeze
solution, set SW2-2 to the WELL position.
Typical open loop piping is shown below in Figure 9. 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 Table 2 on page 22. Normally, about 2 gpm flow rate
per ton of cooling capacity (1.5 gpm per ton minimum at 50°F) is needed in open loop systems.
Auxiliary Heat Supply
Unit Supply
Disconnects
(If Applicable)
Low Voltage
to Thermostat and
Valve
Premier 2 Unit #1
SL1 SL1 Not Not
C C
In Out Used Used
With pump
wired to
Unit 2
Not Not
SLG SL
Used Used
Flexible Duct Collar
Auxiliary
Heater
Knockout
Unit Power
Desuperheater
Connections
P/T Plugs
Vibration Absorbing Pad
SX unit
Premier
1 2 3 4 5 6 7 8
High
Voltage
Normally Open
L 1
Contacts
PB1
L 2
24v
Coil
C SL1 IN
Premier 2 Unit Low Voltage
Wiring Legend
Low Voltage
High Voltage
One Premier 2 unit
and one Spectra
electro-mechanical unit
Rubber Bladder
Expansion Tank
Solenoid Valve
Drain
Boiler Drains
For HX Flushing
Strainer
FC 1 or FC 2
Flow Center
240v
pump
Flow Control
Valve
(on oulet of
solenoid
valve)
Water Out
Water In
Shut-Off
Valves
Shut-Off Valve
(to isolate solenoid
valve while acid
flushing)