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Bosch Greensource SM024 Installation, Operation And Maintenance Manual page 38

Greensource cdi series sm model water-to-air heat pumps
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38 | System Protection
Lockout
If the number of freeze faults detected exceeds
two to four times (based on configuration set via
the Bosch EasyStart app) within one hour, the
controller will go into hard lockout. The status LED
indicator will flash three times and the alarm relay
will pulse three times as well, if configured for
pulse. See Table 9: HPC Status LED Information on
page #45. Also see "Clearing a Hard Lockout" on
page #29.
Fig. 62 FZC Sensor Location
Evaporator Air Coil Freeze (FZE) Sensor
The FZE sensor is installed on the entering
refrigerant pipe after the thermal expansion device
and before the air coil. The freeze limit trip is set
to factory default at 30°F. If the temperature drops
below or remains constant at the freeze point for
more than 30 seconds after the compressor is
energized, the controller will shut down the
compressor to prevent freezing the air/evaporator
coil. The compressor will not be re-energized until
the temperature increases 10°F above the freeze
limit and the ASC delay has expired.
8733819578 (2019/02)
If the number of freeze faults detected exceeds
two to four times (configurable via the Bosch
EasyStart app) within one hour, the controller will
go into hard lockout. The status LED indicator will
flash six times, alarm relay will pulse six times as
well, if configured for pulse. To clear the hard
lockout condition, power must be reset at the (Y)
terminal (factory settings) or (R) terminal
(configurable via the Bosch EasyStart app).
Location of the FZE is shown on Fig. 63.
The Freeze Evaporator sensor limit trip is not
configurable.
Fig. 63 FZE Sensor Location
Discharge Refrigerant Temperature (DRT) Sensor
The Heat Recovery Package (HRP) controller will
monitor the DRT sensor and only allow the HRP
pump to run when the DRT is suitable for hot water
production or enabled via the Bosch EasyStart
app. The HPC will issue a warning if the DRT sensor
is invalid or not within range (via the live monitor
screen on the Bosch EasyStart app). Location of
the DRT sensor is shown on Fig. 64. It is mounted
on the discharge line of the compressor.
Subject to change without prior notice
Greensource CDi Series SM
Greensource CDi Series SM Model

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