10
5 SERIES OPTIHEAT 504W11 INSTALLATION MANUAL
Field Connected Water Piping cont.
Multiple Units on One Flow Center
NOTE:
This feature is only available in the Aurora Advanced
Control package (AXB board), NOT the Aurora Base Control
(ABC).
When two units are connected to one loop pumping 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 (see
Figure 2). 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
flow center is generally limited to a total of 20 gpm capacity.
It is recommended that water solenoid valves be installed
on heat pumps that share a flow center. This is to allow
water flow through only the heat pump that has a demand.
Circulating fluid through a heat exchanger of a system that is
not operating could be detrimental to the long term reliability
of the compressor.
Variable Speed Pump Setup
When using a variable speed pump flow center (FCV1-GL,
FCV2-GL, FCV1-GLNP or FCV2-GLNP) the use of an AID
Tool will be necessary to adjust minimum and maximum flow
rates. The factory default is minimum = 75% 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.
Figure 2: Primary/Secondary Hook-up
5 Series to
Electromechanical Units
To Electromechanical Unit
5 Series to
Envision Units
Envision Unit #2
5 Series Unit #1
with AXB Board
5 Series Unit #1
with AXB Board
5 Series Unit #1
with AXB Board
5 Series Unit #2
with AXB Board
5 Series to
5 Series Units
C
S
VS
SLO
SLI
OUT
IN C
C
VS
SLO
SLI
OUT
IN C
C
With pump
wired to
Unit 2
With pump
wired to Unit 1
VS
SLO
SLI
OUT
IN C
C
Shut
Down
C
C
SL1
In
SL1
Out
With pump
wired to
Unit 1
With pump
wired to
Unit 2
VS
SLO
SLI
OUT
IN C
C
Summary of Contents for 5 Series 504W11 OptiHeat
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