Bosch Heatronic 4000 Installation & Operating Instructions Manual page 23

Wiring a DHW Tank Pump
A DHW tank pump requiring up to
the IDHW Pump terminals.
• Connect the line wire (L) to terminal 85.
• Connect a wire from terminal 86 to the pump L.
• Connect a wire from the pump N back to the power source neutral.
• Ensure grounds are connected in the pump & control wiring chambers.
Wiring Auxiliary Terminals
A C.A. damper or DHW recirculation pump requiring up to
switched through the Auxiliary terminals.
• Connect the line wire (L) or R (low voltage)
to terminal 43.
• Connect a wire from terminal 44 to the L or
R on the auxiliary device.
• Connect the N (line voltage) or C (low voltage)
back to the power source neutral.
• Ensure grounds are connected in the
pump & control wiring chambers.
Wiring an Alert
An Alert device requiring up to
Dry terminals to provide notification of specific system events.
• Connect the line wire L (line voltage) or R (low voltage) to terminal 46.
• Connect a wire from terminal 45 to L or R on the alert device.
• Connect the N (line voltage) or C (low voltage) back to the power source neutral.
Wiring a Primary Pump (PrimPump) Flow Proof
The Heatronic 4000 requires a closed switch or short for proof of flow. Up to 24 V (ac) can be passed
through the switch. If a flow proof device is being used, ensure the Prim Pump Flow Proof / Off DIP switch
on the front of the control is set to the Prim Pump Flow Proof position.
• Connect the PrimPump Flow Proof terminals 1 & 2 to the flow proof device.
If a flow sensor is being used as the flow proving device, a jumper must be placed across the flow proof
call terminals.
Wiring a Combustion Air (Comb Air) Proof
The Heatronic 4000 requires a closed switch or short for proof of combustion air. Up to 24 V (ac) can be
passed through the switch. If a combustion air proof device is being used, ensure the Comb Air Proof /
Off DIP switch on the front of the control is set to the Comb Air Proof position.
• Connect the Comb Air Proof terminals 3 & 4 to a combustion air proof.
BTC461503101C | 6720810369 (2018/03)
can be switched through
230 V (ac) 5 A, 1/3 hp
C
R
can be switched through the Alert
230 V (ac) 5 A, 1/6 hp
L
N
G
can be
230 V (ac) 5 A, 1/6 hp
C R
C.A.
Damper
OR
Auxi l i ar y
Heatronic
4000
43 44
23 of 60
Terminals 85, 86
85 86
Heatronic
4000
DHW Tan k
Pump
L
G N
Terminals 43, 44
DHW
Recirculation
Pump
N L
G
N
L
Heatronic
Aux ili ary
4000
43 44
Terminals 45, 46
L or R
N or C
Heatronic
4000
Terminals 1, 2
Heatronic
4000
Terminals 3, 4
Heatronic
4000
Heatronic 4000
Ground
Ground
Ale r t
Dry
45 46
Prim Pump
Flow Pr oo
1 2
Comb
Air Pro o f
3 4