9
5 SERIES OPTIHEAT 504W11 INSTALLATION MANUAL
Field Connected Water Piping cont.
Modulating Water Valve Setup
When using a modulating water valve kit (4MWVK or
5MWVK) the use of an AID Tool will be necessary to adjust
minimum and maximum flow rates. The factory default is
minimum = 70% and maximum = 100% flow levels.
Since the
OptiHeat is a single speed unit, the minimum and maximum
must be set at the same level.
See the Variable Speed Pump
Setup and Modulating Water Valve Setup instructions within
the Unit Startup section which is located in the back of this
manual. Refer to the Flow Rate section of this manual to
ensure that there is adequate flow for the heat pump.
VS
GND
24 VAC
0-10DC
1
2
3
R
C
ABC BOARD
AXB BOARD
MODULATING VALVE
1
2
Red
White
Green
NO TE: 13
Modulating Water Valve Connection Option
Typical 0-10VDC modulating water valve.
Earth Coupled Systems with Flow Center
NOTE:
For closed loop systems with antifreeze protection,
set SW2-1 to the “LOOP” (15°F) position. (Refer to the DIP
Switch Settings table in the Aurora Control section.)
Once piping is completed between the unit, pumps and the
ground loop (see figure below), final purging and charging
of the loop is required. A 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 turn the venting (burping)
screw in the center of the pump two (2) turns open (water
will drip out), wait until all air is purged from the pump,
then tighten the plug. Ensure that the flow center provides
adequate flow through the unit by checking pressure drop
across the heat exchanger and by comparing it to the figures
shown in the Pressure Drop tables. Usually 3 GPM/ton or
minimum 2.25 GPM/ton of cooling capacity is needed in
closed loop earth-coupled applications.
Typical Closed Loop Earth Coupled Installation
Line Voltage
Disconnect
Load Liquid
Connections
Vibration Absorbing
Mesh or Air Pad
P/T Plugs
Unit Connector Kits
with Insulation
Earth Coupled Loop
Piping with Insulation
Summary of Contents for 5 Series 504W11 OptiHeat
Page 2: ......
Page 46: ...46 5 SERIES OPTIHEAT 504W11 INSTALLATION MANUAL Notes...
