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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 BOVA15 and
BVA15 manufacturer matched indoor and outdoor systems.
Bosch IDS BOVA15 Split System Heat Pump - BTC 761701317 A (02.2022)
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.
Figure 25
Installation Instructions
| 15
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