Applications Manual FHP560 Controller
| 7
Bosch Thermotechnology Corp.
Data subject to change
Page____ of ____
7 I/O Port Assignments And Overview
Universal Inputs
Port
Inputs Accepted
Signal Type
Jumper Position
Overview
IN-1
Digital Input
Enable
Dry
Top (W4)
This input is selected when a dry contact (e.g. room occupancy sensor) is required
to enable the unit, and Digital Input has been selected for Occupancy Command.
Unit is placed in occupied mode upon a percieved contact closure at the input, and
placed in unoccupied mode 10 minutes after the contacts open.
Humidity Sensor
0-5VDC
Bottom (W5)
This input is used if RH readings are not desired from a ZS Combo sensor or over
a network. An example would be a duct mounted humidity sensor or third party
humidity sensor with 0-5VDC output.
CO
₂
Sensor
0-5VDC
Bottom (W5)
This input is used if CO
₂
readings are not desired from a ZS Combo sensor or over
a network. An example would be a third party CO
₂
sensor with 0-5VDC output.
Static Pressure
Sensor
0-5VDC
Bottom (W5)
This input is used for applications requiring static pressure readings.
IN-2
Zone Remote
Sensor
Therm
Top (W6)
This input is used if zone temperature readings for controlling the unit are not
desired from a ZS Combo sensor or over a network. An example would be a third
party wall or duct mounted sensor. Temperature sensor must be a Type II 10kohm
@ 77°F(25°C) type sensor.
Outdoor Air
Temperature
Sensor
Therm
Top (W6)
This input is selected if outside air temperature readings are required.
Entering Water
Temperature
Sensor
Therm
Top (W6)
This input should be selected for applications where the entering water
temperature needs to be monitored, or used to control options such as Economizer
or Boilerless Electric Heat.
Mixed Air
Temperature
Sensor
Therm
Top (W6)
This input is selected if mixed air temperature readings are required.
Return Air
Temperature
Sensor
Therm
Top (W6)
This input is used if zone temperature readings for controlling the unit are desired
from a temperature probe placed in the return air duct. Temperature sensor must
be a Type II 10kohm @ 77°F(25°C) type sensor.
Digital Input
Enable
Dry
Top (W6)
This input is selected when a dry contact (e.g. room occupancy sensor) is required
to enable the unit, and Digital Input has been selected for Occupancy Command.
Unit is placed in occupied mode upon a percieved contact closure at the input, and
placed in unoccupied mode 10 minutes after the contacts open.
Humidity Sensor
0-5VDC
Bottom (W7)
This input is used if RH readings are not desired from a ZS Combo sensor or over
a network. An example would be a duct mounted humidity sensor or third party
humidity sensor with 0-5VDC output.
IN-3*
Leaving Water
Temperature
Sensor
Therm
n/a
A thermistor is wired to this input from factory to monitor leaving water
temperature at the heat exchanger leaving water pipe. If the water temperature
rises above 135°F or drops below 40°F for more than 5 minutes while the unit
is running, compressor operation is halted and an alarm is generated. These
temperature trip values are user adjustable.
Table 4
* Non-con
fi
gurable, factory assigned I/O parameter
Universal Inputs
Port
Inputs Accepted
Signal Type
Jumper Position
Overview
IN-4*
UPM Input
Pulse
n/a
The Unit Protection Module (UPM) is standard on all FHP heat pumps. The alarm
contacts of the UPM board are wired to the controller at this input from factory
to transmit error pulse codes to the FHP560. These alarm codes are then made
available to view via a BACview interface, ZS Pro Sensor, or over a network if one
is available. Faults include: High Pressure, Low Pressure, High Condensate, Freeze
Stat, and Brown out conditions.
IN-5
Dirty Filter Switch
(DFS)
Dry
n/a
Selecting this option for this input provides an alternate means of alerting the end
user of a dirty
fi
lter condition by way of a contact closure instead of fan runtime
hours. An alarm is generated when FHP560 senses a contact closure at the input.
Entering Water
Temperature
Sensor
(Economizer
Cooling &
Boilerless Electric
Heat)
Therm
n/a
This input should be the default location for an EWT sensor when the Water-
Side Economizer or Boilerless option is selected. The temperature readings from
this input are used in determining when the economizer or electric heat action
is enabled and MUST be selected for the option to function properly. Default
economizer EWT trip value is 55°F (user adjustable). Default boilerless EH EWT trip
value is 40°F (user adjustable).
Differential
Pressure Switch
(DPS)
Dry
n/a
A Differential Pressure Switch may be connected to this input to prove water
fl
ow across a unit's water-to-refrigerant heat exchanger. Heat pump operation is
disabled until the status switch of the DPS is closed, after which if the contacts
open again unit operation is ceased after 3 minutes.
Secondary Drain
Pan (SDP)
Dry
n/a
This option allows a secondary condensate pan installed on the heat pump to be
connected to this input to monitor condensate levels when the primary drain pan
fails. When a high condensate condition for the secondary drain pan is detected an
open contact status is reported at the input, and the compressors are locked out
until the condition is reversed. An alarm is generated when the FHP560 senses an
open contact at the input.
Fan Status Switch
(FSS)
Dry
n/a
The status output from a factory installed current sensor used to monitor fan
operation may be connected to this input to provide fan status during unit
operation. The unit is allowed to run only when the sensor contacts are veri
fi
ed
as closed at the input after the fan has been indexed to run. If there's no contact
closure after the fan has been commanded on, the unit is not allowed to run, and
an alarm is generated after 45 seconds. If the fan fails during normal unit operation
the compressors are shutdown after 20 seconds and an alarm is generated.
Valve End Switch
(VES)
Dry
n/a
For units with a loop valve option, the Valve End Switch may be connected to this
input to monitor/verify valve status during unit operation. The factory-installed zone
valve is normally-closed and is indexed to open by the FHP560 when there's a call
for heating or cooling. If a contact closure is not detected at the input after the
valve is commanded on, unit operation is disabled and an alarm is generated after a
minute and a half has elapsed; this provides adequate time for the slow acting valve
to fully open.
Damper End
Switch (DES)
Dry
n/a
A damper end switch may be connected at this input for units with the outside air
damper option. If connected, the unit is not allowed to run until a contact closure
is detected at the input after the damper has been indexed to open. Damper
operation may be based on occupancy, fan operation, or zone CO
₂
levels (default
trip value is 1000ppm).
Table 5
* Non-con
fi
gurable, factory assigned I/O parameter
