MEES21K047
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75
8. SYSTEM DESIGN GUIDE
WR2-Series-575V
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
• Plural indoor units (8HP:15sets, 16HP:16sets maximum) 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.
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
1
TB8
Heat source equipment
Heat source equipment
To next equipment
2
3
4
1
TB8
2
3
4
MP
Site control panel
~ 208/230V
X :
Relay
FS : Flow switch
52P : Magnetic contactor
for heat source
water
pump
MP : Heat source
water
pump
MCB : Circuit breaker
* Use an insulated ring
terminal for the cable that
connects to TB8.
52P
MCB
L1
L2
*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)
Flow switch:FS
Flow switch:FS
52P
Operation
ON signal
X
Pump interlock
Operation
ON signal
X
Pump interlock
0000006382.BOOK 75 ページ 2021年7月19日 月曜日 午後4時14分