Installation manual

8
PREMIER INSTALLATION MANUAL
Multiple Units on One Flow Center
When two units are connected to one loop pump-
ing system, pump control is automatically achieved by
connecting the SL terminals on connector P2 in both
units with 2-wire thermostat wire. These terminals are
polarity dependant. The loop pump(s) may be powered
from either unit, whichever is more convenient. If either
unit calls, the loop pump(s) will automatically start. The
use of two units on one fl ow center is generally limited to
a total of 20 GPM capacity.
Closed Loop Ground Source Systems
Note: For closed loop systems with antifreeze protection, set SW2-2 to the “loop” position (see table on page 32).
Once piping is completed between the unit, fl ow center and the ground loop (see fi gure below), fi nal purging and charg-
ing of the loop is required. A fl ush cart (or a 1.5 HP pump minimum) is needed to achieve adequate fl ow 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 fl uctuate with the sea-
sons. Pressures will be higher in the winter months than during the cooling season. This fl uctuation 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 fl ooded. Ensure that the loop fl ow center provides adequate
fl ow through the unit by checking the pressure drop across the heat exchanger and comparing it to the unit capacity data
in the specifi cation catalog. Usually 2.5 to 3 GPM of fl ow per ton of cooling capacity is recommended in earth loop applica-
tions. (See wiring diagram attached to the inside of the unit for pump wiring details.)
Flexible Duct
Collar
Vibration Absorbing Pad
P/T Plugs
Drain
TO
LOOP
Desuperheater
Connections
Auxiliary
Heater
Knockout
Low
Voltage to
Thermostat
External
Pump Power
Unit Supply
Auxiliary Heat
Supply
GeoLink
®
Flow
Center
GroundL oopConnector
Kits withArmaflex
®
(CK4S or CK4L)
GeoLink
®
Polyethylene w/
Armaflex
®
Insulation
Disconnects
(IfApplicable)
Unit Power
Figure 6: Closed Loop, Ground Source Application - Single unit with Flow Center
Figure 7: Primary/Secondary Hook-up
Shut
Down
CC
SL2
In
SL2
Out
Shut
Down
CC
SL1
In
SL1
Out
SL2
In
SL2
Out
SL1
In
SL1
Out
Premier Unit #1
Premier Unit #2
With pump
wired to Unit 1
With pump
wired to
Unit 2
Premier to Premier
Microprocessor Units
Premier to
Electromechanical Unit
Shut
Down
CC
SL2
In
SL2
Out
SL1
In
SL1
Out
Premier Unit #1
To Electromechanical Unit
C
S