Bosch TW Series - User Manual

Bosch TW Series

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Installation, Operation and Maintenance Manual

TW Series

6720220047 (2016/02)

Water to Water

Table of Contents

Other manuals for Bosch TW Series

Installation And Maintenance Manual24 pages

Questions and Answers:

K
Kimberly RamirezSep 6, 2025
What does yellow alert flash code 6 mean on my Bosch TW Heat Pump?
- A
  Ashley SanchezSep 6, 2025
  A yellow alert flash code 6 on your Bosch Heat Pump indicates an open start circuit, with current only in the run circuit. This could be due to a failed run capacitor (verify if it's bad), an open circuit in the compressor start wiring or connections (check wiring and connectors between the supply and the compressor "S" terminal), or damaged compressor start winding (check compressor motor winding resistance).
D
Dakota BlairNov 22, 2025
What to do if my Bosch TW Heat Pump has insufficient cooling or heating?
- R
  robinsalasNov 22, 2025
  If your Bosch Heat Pump is not providing enough cooling or heating, several factors could be responsible. First, the unit might be undersized, requiring you to recalculate the heating or cooling loads, and possibly add insulation or shading. Second, there might be a lack of adequate fluid flow. Also, a low refrigerant charge can cause inefficient operation. Check for a defective compressor, indicated by low discharge and high suction pressure, and replace if necessary. A defective reversing valve could also be the problem, causing refrigerant bypass; replace it if needed. Compare the unit's operating pressures to the pressure/temperature chart. Check the TXV for restrictions or defects, and replace if necessary. Finally, the refrigerant system may be contaminated with moisture or nonconden...
M
Mary LawsonSep 19, 2025
Why does my Bosch TW Heat Pump turn off because of the low-pressure switch?
- E
  Elizabeth AdamsSep 19, 2025
  If the Bosch Heat Pump shuts down due to the low-pressure switch, the suction pressure may be too low. In cooling mode, check the load coil for inadequate fluid flow, excessively cold entering water temperature or scaling/plugging. In heating mode, inspect the source coil for the same issues. Also, the unit may be low on refrigerant. Check for refrigerant leaks, repair them, evacuate the system, and recharge with the factory-recommended charge. Finally, the low-pressure switch itself could be defective or improperly calibrated; inspect the switch.
S
sandrasalazarSep 18, 2025
What to do if my Bosch Heat Pump shuts off due to the high-pressure switch?
- A
  andersonkatelynSep 18, 2025
  If your Bosch Heat Pump is turning off due to the high-pressure switch, it could be due to several reasons. In cooling mode, check for inadequate water flow or excessively warm entering water temperature at the source coil, or scaling/plugging of the condenser. In heating mode, inspect for similar issues at the load coil. The unit might also be overcharged with refrigerant; if so, reclaim the refrigerant, evacuate the system, and recharge it with the factory-recommended amount. Finally, the high-pressure switch itself may be defective or improperly calibrated, so check that as well.
T
Troy ClarkSep 14, 2025
What causes low heat output in my Bosch TW?
- M
  Mark MartinezSep 14, 2025
  Low heat output in your Bosch Heat Pump can be caused by a scaled or fouled heat exchanger. Clean the heat exchanger to resolve this issue.
T
Tracy HillSep 12, 2025
What causes high water temperature in my Bosch TW Heat Pump?
- M
  Michael JenningsSep 12, 2025
  High water temperature in your Bosch Heat Pump can be caused by a water temperature limit being closed. This could be due to a stuck limit switch or a sensor that is not securely attached to the line.
Z
zmeyerSep 12, 2025
What does yellow alert flash code 8 mean on my Bosch Heat Pump?
- K
  Kyle WuSep 12, 2025
  A yellow alert flash code 8 on your Bosch Heat Pump indicates a welded contactor. This means the compressor contactor has failed closed, or the thermostat demand signal is not connected to the module.
H
Holly SotoSep 9, 2025
What does yellow alert flash code 9 mean on my Bosch TW?
- L
  Lisa PhillipsSep 9, 2025
  A yellow alert flash code 9 on your Bosch Heat Pump indicates low voltage. This can be due to an overloaded control circuit transformer or low line voltage (contact utility if voltage at disconnect is low and check wiring connections). If both TRIP and ALERT LEDs are flashing simultaneously, it means the control circuit voltage is too low for operation.
E
Elijah McintoshSep 7, 2025
What does yellow alert flash code 7 mean on my Bosch TW Heat Pump?
- P
  Patricia KlineSep 8, 2025
  A yellow alert flash code 7 on your Bosch Heat Pump indicates an open run circuit, with current only in the start circuit. This could be due to an open circuit in the compressor run wiring or connections (check wiring and connectors between the supply and the compressor "R" terminal), or a damaged compressor run winding (check compressor motor winding resistance).
A
Andrew OwensAug 21, 2025
Why is my Bosch TW not running?
- D
  david65Aug 21, 2025
  The Bosch Heat Pump might not be running due to several reasons. It could be due to the power supply being off, in which case you should apply power and close the disconnect. Another cause could be a blown fuse, requiring you to replace the fuse or reset the circuit breaker, ensuring you use the correct fuses. Finally, a low voltage supply could be the issue. If the voltage is below the minimum specified on the unit's data plate, contact your local power company.

Bosch TW Series Specifications

General

Brand	Bosch
Model	TW Series
Category	Heat Pump
Language	English

Summary

Safety Warnings

Model Nomenclature

Standard TW Package

Installation

Instructions for mounting the unit on a vibration absorbing pad.

Safety Devices and the UPM Controller

UPM Controller Settings and Features

Factory Default Settings

Lists default UPM board parameter configurations.

DIP Switch Settings

Details UPM board DIP switch default positions for functions.

Key UPM Features

Describes UPM features like anti-short cycle, random start, low pressure bypass.

SEQUENCE OF OPERATION

Cooling Mode

Heating Mode

SEQUENCE OF OPERATION FLOW

SYSTEM CHECKOUT

WATER TO WATER UNIT CONTROLLER

Features

Lists key features of the Bosch water heat pump controller.

Unit Sensors

Modes Of Operation

Details unit operational modes: Off, Heating, Cooling.

Auto Changeover Mode

Unit Protection

Describes controller protection against faults and ensuring safe operation.

MANUAL LOCKOUT

OPERATING INSTRUCTIONS

User Interface

USER ADJUSTABLE SETTINGS CHART

SETTING UP THE CONTROLLER

INITIAL CONFIGURATION

Unit Troubleshooting

Comfort Alert Module - Flash Codes

Unit Lockouts

UPM Board LED Indications

WIRING DIAGRAMS

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