Flow Centers - York AFFINITY OptiHeat YAW040 Installation Manual

AFFINITY SINGLE STAGE HYDRONIC WITH OPTIHEAT 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 (FCU Type) 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.

Flow Centers

Pressurized Flow Centers:
• Part numbers: FC1-GL, FC2-GL, FC1-FPT, FC2-
FPT,FCV1B-GL, FCV2B-GL
• Used with one or two one or multiple heat pumps
on a single loop (need to follow installation manual
and install check valves)
• Fixed speed and variable speed pumping available.
• Small footprint for mounting location flexibility.
• Can be mounted in several orientations (see flow
center manual for acceptable orientations)
• Injection molded and insulated cabinet
• Brass 3-way valves
• Standard hose kits available
Non-Pressurized Flow Center:
• Part numbers: FC1-GLNP, FC2-GLNP, FCV1B-
GLNPP, FCV2B-GLNPP
• Used with a single heat pump on a single loop (or
two units if using pump sharing feature). Multiple
units cannot be installed in parallel with multiple
heat pumps on the same loop.
• Fixed speed and variable speed pumping available.
• Floor mounted (larger footprint than pressurized
flow centers)
Figure 2: Primary/Secondary Hook-up
AXB to AXB
Unit #1
with AXB Board
SLI SLO VS
IN C OUT C
With pump
With pump
wired to Unit 1
wired to
Unit 1
With pump
wired to
Unit 2
IN C OUT C
SLI SLO VS
Unit #2
with AXB Board
• Design allows for air and debris separation, and easy
fluid checking or addition
• Insulated plastic cabinet
• Composite 3-way valves
• GLNPP flow centers use standard hose kit
Non-Pressurized Dual Circuit Flow
Centers:
• Part numbers: FC3-GLNPD, FC4-GLNPD, FCV2AB-
GLNPD, FCV2BB-GLNPD, FCV3CB-GLNPD, FCV4AB-
GLNPD
• Designed for applications with two geothermal heat
pumps by eliminating the need for T's, additional
piping, check valves, and pump sharing wiring.
• Multiple pump configurations (fixed and variable speed)
to match your flow requirements.
• Insulated sheet metal cabinet
• Brass and composite 3-way valves
• Design allows for air and debris separation, and easy
fluid checking or addition
• Floor mounted (larger footprint than pressurized flow
centers)
• Standard hose kits available
10
AXB to AXB to
Premier Electromechanical Units
Unit #1
with AXB Board with AXB Board
SLI SLO VS SLI
IN C OUT C IN C OUT
With pump
wired to
Unit 2
SL1 SL1
Shut
C C
Down In Out
C S
Unit #2
T o Electromechanical Unit
with Premier Board
Unit #1
SLO VS
C