Heat Pump Controller
Heat Pump Controller
8733819577 (2019/02)
Subject to change without prior notice
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Introduction
INTRODUCTION
Product Description
The Heat Pump Controller (HPC) as shown in
Fig. 1, is a Printed Circuit Board Assembly (PCBA)
that interfaces with the thermostat to ensure
desired functionality. It is designed to protect the
condenser coil, evaporator coil, compressor, and
blower motor by monitoring different states of its
switches and sensors.
This device provides time delays to prevent the
system from operating under extreme and
potentially hazardous conditions. The HPC
provides useful information to service personnel
for diagnosing unit operating conditions and faults
when they arise via the Bosch EasyStart app
interface.
Fig. 1 Heat Pump Controller
Table 1 Available Fault Snapshots
Item No.
Description
1
HPC Ground Standoff
2
Thermostat Power Source
3
Thermostat Control Signals
4
Humidistat Control Signals
5
Comm Port RS 485
6
Electric Heat 1 Output
7
Electric Heat 2 Output
8
Display Output
9
Alarm Output (Dry N.O.)
10
Heat Pump Control Output
11
COMM Port Status LEDs
12
HRP Fuse (1 AMP)
13
High-Voltage Pump Outputs
14
Loop Pump Fuses (5 AMP)
15
P5 Termistor Input Plug
Item No.
Description
16
Wi-FI Service Port
17
P4 ECM Motor Control Plug
18
Unit Status LED
19
P3 HRP Termistor Plug
20
P2 Heat Pump Safety Plug
21
P1 24VAC Power Supply Plug
22
Class II Voltage Fuse (3 AMP)
23
Power Status LED
24
Backup Battery (CR2032)
25
PCB Serial Number
26
Thermostat Control Signal LEDs
27
Heartbeat LED
