Electrical - Low Voltage; Low Voltage Maximum Wire Length; Low Voltage Hook-Up Diagrams; Thermostat Wiring Diagrams - Bosch BOVA Series Installation Instructions Manual

Installation Instructions

11 Electrical - Low Voltage

11.1 Low Voltage Maximum Wire Length

Table 4 defi nes the maximum total length of low voltage wiring from the outdoor
unit, to the indoor unit, and to the thermostat.
24 Volts - Wire size
18 AWG
16 AWG
14 AWG
Table 4

11.2 Low Voltage Hook-Up Diagrams

Figure 24
Low Voltage Unit Connections

11.3 Thermostat Wiring Diagrams


Be sure power supply agrees with equipment nameplate.

Power wiring and grounding of equipment must comply with local codes.

Low voltage wiring to be No. 18 AWG minimum conductor.

"- - - - - - - -" Field installed electric auxiliary heat connection

Single-stage auxiliary heating supported by 2H thermostat

Twin-stage auxiliary heating supported by 3H thermostat

W1: The first stage of field installed electric auxiliary heat.

W2: The second stage of field installed electric auxiliary heat.

The outdoor unit W signal is connected to the electric auxiliary heat or
the first stage electric auxiliary heat.
Figures 25-30 refer to thermostat wiring diagrams for the BOVA2.0 and
BVA2.0 manufacturer matched indoor and outdoor systems.
Bosch Thermotechnology Corp. | 02.2019
Max. Wire Length
150 Ft.
225 Ft.
300 Ft.
Control
Board
Access
Panel
NOTES:
- Low voltage connection must be made inside the
outdoor unit control board access panel.
- There is no terminal block for low voltage connections,
wires must be spliced using field supplied wire nuts
- Field supplied wire nuts should be 22-16 gauge.
- Refer to unit wiring diagram for more information.
Dashed lines in the following thermostat wiring diagrams refer to optional
wiring (wiring for Passive Dehumidifi cation Function and/OR Electric
Heat). For thermostat wiring please refer to the Owner's Manual of the
thermostat.
B terminal to be connected with thermostat (O/B) wiring. Reversing valve
energizes in heating.
Bosch IDS BOVA | 15
Data subject to change