8. SYSTEM DESIGN GUIDE
HEAT SOURCE
156
WR2
MEE15K036
Indoor
unit
Heat source
equipment
Water
circuit
Heat source
water pump
(MP)
Site control panel
Refrigerant piping
Transmission line
BC controller
Remote controller
Room-A
Indoor
unit
Room-B
Room-E
Indoor
unit
Room-C
Indoor
unit
Room-D
Room-F
(Remote controller
operation at two spot)
Room-G
6) Pump interlock circuit
Flow switch:FS
Flow switch:FS
1
TB8
2
3
4
1
TB8
2
3
4
MP
~ / N 240/230/220V
52P
MCB
L
N
52P
This circuit uses the “Terminal block for pump interlock (TB8)“ inside the electrical parts box of the heat source equipment.
This circuit is for interlocking of the heat source equipment operation and the heat source water pump.
Wiring diagram
Heat source equipment
Operation
ON signal
Pump interlock
Operation
ON signal
Pump interlock
Heat source equipment
To next equipment
Site control panel
X :
Relay
Rated voltage : L1 - N
: 220 ~ 240V
Rated load : 1A
FS : Flow switch
52P : Magnetic contactor
for heat source
water pump
MP : Heat source
water pump
MCB : Circuit breaker
*Remove the short circuit
wire between 3 and 4
when wiring to TB8.
*Pump interlock
Operating the heat source unit without circulation water
inside the water piping can cause troubles. Be sure to
provide interlocking for the unit operation and water
circuit(pump interlock). Since the terminal block is being
provided inside the unit, use it as required.
Use the flow switch (FS)
• Plural indoor units being connected to
a single refrigerant system can be controlled individually.
• The transmission line is of a jumper wiring system using non-polar 2 wires.
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