Heat Pump Controller
Heat Pump Controller
8733819577 (2019/02)
Subject to change without prior notice
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Unit Configuration
To exit a hard lockout, power must be reset at the
(Y) terminal (factory setting) or (R) terminal
(configurable via the Bosch EasyStart app). The
alarm, display, and status LED indicator outputs
should only pulse the latest fault. Once the latest
fault is cleared, the HPC will pulse for any
remaining faults recorded.
Refer to “Alarm Terminal Wiring” on page #33.
Configurable Hard Lockout
The controller can be configured from two to four
faults for a hard lockout condition (configurable
via the Bosch EasyStart app). If the controller
senses the same fault for the number of times
configured within one hour from the first fault, the
controller will enter a hard lockout. Example:
When configured to four strikes, if the control
experiences four of the same faults within one
hour then the controller will enter a hard lockout.
Clearing a Hard Lockout
To clear a hard lockout condition, power to the (R)
terminal may be reset at the circuit breaker panel,
or the heat/cool call to the (Y1) terminal may be
reset from a connected thermostat (default). The
HPC can be configured for either reset option
using the Bosch EasyStart app.
Fan Motor
The installer can modify the total Cubic Feet per
Minute (CFM)/Ton via the Bosch EasyStart app as
shown in the table below.
Table 3 CFM Configure
The controller calculates the required flow rate
(CFM) based on the unit’s model and size. The
controller has a cooling CFM/Ton lower limit of
270. If effective CFM is lower than this value, the
controller will override the effective CFM with the
verified CFM preventing it from being lower than
270 CFM/Ton. The cooling verified CFM will apply
to the cooling and the dehumidification modes of
the operation.
The controller has a heating CFM/Ton low limit of
400 for electric heat operation. If the effective CFM
is lower than this value the controller will override
the effective CFM with the verified CFM value and
latch it to 400 Cubic Feet per Minute (CFM)/Ton.
The controller has a “Most Efficient Mode”
configuration. The function of this is to enable the
unit to run at the most efficiently-rated CFM values
as tested in our labs.
Fan Motor Table
The Fan motor is specified in the third and fourth
digits of the code string nomenclature.
•
SM024 = 2 Ton 2-step unit
•
SM036 = 3 Ton 2-step unit
•
SM048 = 4 Ton 2-step unit
•
SM060 = 5 Ton 2-step unit
•
SM070 = 6 Ton 2-step unit
State
Max
Installer
CFM per
Ton
Min
Installer
CFM per
Ton
Step
Installer
CFM
Default
COOLING
450
300
25
400
HEATING
450
300
25
400
