Applications Manual FHP560 Controller
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Bosch Thermotechnology Corp.
Data subject to change
Page____ of ____
11.14 HP + HGRH + LP + (DFS-PSS)
UNIT TERMINAL BLOCK
TO BACnet
MS/TP
NETWORK
LWTS
STANDARD COMPONENTS:
DATS - DISCHARGE AIR TEMPERATURE SENSOR
LWTS - LEAVING WATER TEMPERATURE SENSOR
REFER TO UNIT WIRING DIAGRAM FOR FURTHER DETAILS
DATS
T1
T2
A
A
B
B
C
C
641-264
IEM
FHP560
Heat Pump Sequence of Operation – HP + HGRH + LP + (DFS-PSS)
Supply Fan Start/Stop:
The supply fan will be started according to the schedule. After the supply fan has been started the control sequence will be enabled.
Zone Control:
The compressor will cycle to maintain the zone temperature at setpoint.
Heat Pump Control:
When the zone temperature falls below the zone temperature setpoint the reversing valve will be disabled to provide heating when the
compressor is running. When the zone temperature rises above the zone temperature setpoint the reversing valve will be enabled to provide
cooling when the compressor is running.
Night Setback:
When in “unoccupied”, the unit will cycle as necessary to maintain the night setback zone temperature at setpoint.
Shutdown:
When the unit is shutdown by either a stop command or system safety the unit will be set as follows:
Supply fan will be on (user configurable)
Compressor(s) will be off
Dirty Filter Switch:
A
fi
eld installed status switch is used to provide a contact closure at the con
fi
gured input (IN-5 or IEM) when the
fi
lter is ready to be serviced.
An alarm is generated immediately after the switch closes, and is available on a ZS Pro sensor, BACview interface, or over a network.
Hot Gas Reheat:
Once the heat/cool setpoint has been satis
fi
ed and relative humidity is above setpoint, the unit will operate in hot-gas reheat mode to actively
remove humidity from the space until the the humidity setpoint has been satis
fi
ed, or there’s another call for heating or cooling.
Relative humidity readings may be acquired from a space ZS combo Pro or base sensor, 0-5V sensor in IN-1/IN-2, or over a network; software must
be con
fi
gured accordingly.
Circulating Water Pump (Loop Pump):
Factory installed loop pump with with optional current sensor for pump status veri
fi
cation must be con
fi
gured by the equipment integrator.
Upon a call for compressor operation the pump is indexed to run via BO-5 after 20 secs. Compressor operation is not enabled until sensor switch
is closed (pump is energized and running).
Pump status is veri
fi
ed via the Pump Status Switch (current sensor) within 15 secs of pump enable command.
If Pump Status Switch (PSS) does not close within the 15 secs, pss fail alarm is initiated. If pump runs without command from BO-5, pump in hand
alarm is initiated.
Compressor operation is disabled 20 secs after PSS opens (fails) when pump has been indexed to run.
HEAT PUMP
Point Name
Hardware Points
Software Points
Show On
Graphic
AI
AO
BI
BO
AV
BV
Sched
Trend
Alarm
Zone Temperature
X
X
X
X
Heating Setpoint
X
X
X
Cooling Setpoint
X
X
X
Supply Fan Command
X
X
X
Compressor Stage 1 Output
X
X
X
Compressor Stage 2 Output
X
X
Reversing Valve Command
X
X
X
Occupied Command
X
X
X
X
X
Discharge Air Temperature
X
X
Leaving Water Temperature
X
X
Loop Pump Command
X
X
Pump Status
X
X
Dehumidi
fi
cation Setpoint
X
X
X
Reheat Status
Reheat On/Off (Rh S/S)
X
X
X
High Return Air Humidity
X
Zone Humidity
X
X
X
X
Filter Status
X
X
X
Filter Change Required
X
Condensate Over
fl
ow
X
X
Lockout Alarm
X
X
Schedule
Totals
4
0
3
5
5
3
1
11
5
16
Total Hardware
Total Software
12
25
16
Table 22
