5
Circuit diagram space heating control system (Honey well plan).
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.
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
