6
PREMIER E SERIES DUAL CAPACITY INSTALLATION AND MAINTENANCE MANUAL
GROUND SOURCE SYSTEMS
NOTE:
For closed loop systems with antifreeze protection, set SW2-2 to the "LOOP" position.
(See schematics on pages 14 and 15.)
Once piping is completed between the unit, flow center and the ground loop (see Figure 6 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 40-50 psi
(summer) or 50-75 psi (winter). 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.
After pressurization, be sure to remove the plug in the end of the loop pump motor(s) (if applicable)
to allow trapped air to be discharged and to ensure that the motor housing has been flooded. Ensure
that the loop flow center provides adequate flow through the unit by checkingthe pressure drop across
the heat exchanger and comparing it to the figures shown in Table 2 on page 21. Usually 2.5 to 3 gpm
of flow per ton of cooling capacity is recommended in earth loop applications. (See Figure 13 on
page 13 for loop pump power wiring details.)
MULTIPLE UNITS ON ONE FLOW CENTER
When two Premier E units are connected to one loop pumping system, pump control is
automatically achieved by connecting the slave terminals on connector P2 in both units with 2-wire
thermostat wire. These terminals are polarity dependant (see Figure 7 on page 7). The loop pump(s)
may be powered from either Premier unit, whichever is more convenient. If either unit calls, the loop
pump(s) will automatically start. The use of two units on one flow center is generally limited to a total of
20 gpm capacity.
Closed Loop
Ground Source
Systems
Figure
5A -
Unit Pitch for Drain
1/4'' Pitch
Drain
Figure
5B -
Horizontal Drain Connection
1.5"
1.5"
Vent (if needed)
3/4" PVC
3/4" barb to
glue adapter *
1/8" per foot
Clear PVC hose
Plastic Hose Clamps
Copper tube stub
(Included with unit)
