WaterFurnace AT022C/D, Installation And Maintenance Manual

8

PREMIER 2 SINGLE-SPEED INSTALLATION AND MAINTENANCE MANUAL

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.

Figure 9 - 

Open System:  Groundwater Application

Open Loop

Groundwater

Systems

Figure 8-

 Premier 2 Slave Hook-up

Two Premier 2 units

One Premier 2 unit and one

Premier AT or Spectra unit

(with optional circut board)

SL1

In

SL1

Out

Not

Used

Not

Used

Shut

Down

C

C

Premier 2 Unit #1

With pump
wired to 
Unit 1

With pump
wired to
Unit 2

SL1

In

SL1

Out

Not

Used

Not

Used

Shut

Down

C

C

Premier 2 Unit #2

SL1

In

SL1

Out

Not

Used

Not

Used

Shut

Down

C

C

Premier 2 Unit #1

With pump
wired to Unit 1

With pump
wired to
Unit 2

Not

Used

G L1

SLG SL

Premier or Spectra Unit #2

Normally Open
Contacts

1 2 3 4 5 6 7 8

24v

Coil

SX unit

C

SL1 IN

Premier 2 Unit Low Voltage

Wiring Legend

Low Voltage
High Voltage

FC 1 or FC 2

Flow Center

240v

pump

Premier
High 
Voltage

PB1

L 1

L 2

Not

Used

One Premier 2 unit

and one Spectra

electro-mechanical unit

Boiler Drains

For HX Flushing

Solenoid Valve

Shut-Off

Valves

Rubber Bladder

Expansion Tank

Water Out

Water In

Flexible Duct Collar

Vibration Absorbing Pad

Low Voltage 

to Thermostat and 

Valve

Drain  

Desuperheater
Connections

Auxiliary 
Heater 
Knockout

Disconnects

(If Applicable)

Flow Control 

Valve 

(on oulet of 

solenoid 

valve)

Unit Power

Auxiliary Heat Supply 

Unit Supply 

Strainer

P/T Plugs

Shut-Off Valve

(to isolate solenoid 

valve while acid 

flushing)