WaterFurnace AT019D, Installation And Maintenance Manual

6

PREMIER 2 SINGLE-SPEED INSTALLATION AND MAINTENANCE MANUAL

The proper water flow must be assured to each unit whenever the unit operates. To assure

proper flow, use pressure/temperature ports to determine the flow rate. These ports should be

located adjacent to the supply and return connections on the unit. The proper flow rate cannot be

accurately set without measuring the water pressure drop through the refrigerant-to-water heat

exchanger (circuit setters may also be used). See Table 2 on page 22 for water flow and

pressure drop information.

NOTE: 

For boiler/cooling tower systems with no antifreeze solution, set SW2-2 to the

"WELL"  position.

GROUND SOURCE SYSTEMS

NOTE: 

For closed loop systems with antifreeze protection, set SW2-2 to the "LOOP"

 position.

Once piping is completed between the unit, flow center and the ground loop (see Figure 7

on page 7), final purging and charging of the loop is required. A WaterFurnace flush cart (or a 1.5

HP pump minimum) is needed to achieve adequate flow velocity in the loop to purge air and dirt

particles from the loop itself. Antifreeze solution is used in most areas to prevent freezing. Flush

the system adequately to remove as much air as possible then pressurize the loop to a static

pressure of 50-75 psi (winter) or 40-50 psi (summer). This is normally adequate for good system

operation. Loop static pressure will fluctuate with the seasons. Pressures will be higher in the

winter months than during the cooling season. This fluctuation is normal and should be

considered when initially charging the system.

Closed Loop

Ground

Source

Systems

Figure 6 

- Closed Loop—Cooler/Boiler System

Disconnects

Cooler/Boiler Loop

Flexible Duct

Collar

3/8”

Threaded rods (6)

Hanging

Brackets

(included)

P/T Plugs

Line Voltage

To Thermostat

Insulate supply
plenum and use at
least a 90

°

 elbow

to reduce noise

Ball V

alves

Hose Kits

To Line

Power

Electric heat

assembly
(optional)