5
Circuit diagram space heating control system (Honey well plan).
U W
6 6
2 2
C3
C1
L1 Hold-in contactor coil
2 Main contacts
C3 Retaining contact
4 Start/close button
5 Stop/open button
6 Magnetic thermal
overload trip coils
7 Overload trip contact
To phase supply
To phase motor
7
4
5
FIGURE 3.
L
N
Programmer
HTG only
DHW off
Room thermostat
N
1
1
2
2
C
Cylinder thermostat
White
Grey
Orange
Water
control
zone
valve
Blue
Yellow/
Green
E
N
N
Pump
Clock
motor
Boiler
N
N
L
3
DHW
on
FIGURE 3.70
Basic Electrical Installation Work
White and orange the
zone valve are internally
connected when the room
stat only calling for heat.6
Schematic diagram DOL motor starter.
