Mitsubishi Electric City Multi PWFY-P100VM-E-BU Data Book page 64

15. INSTALLATION
Pump interlock
The unit may become damaged if it is operated with no water circulating through the pipes.Be sure to interlock unit oper-
ation and the water-circuit pump.
In the system including PWFY-P100VM-E-BU, use the terminal blocks for interlocking TB142A (IN1) that can be found on
the unit.
[Fig. 3-1-E]
TB142A
IN1
In the system including PWFY-EP100VM-E1/E2-AU, the circulating water may freeze, and result in a unit malfunction.
Perform the electrical work as shown in [Fig. 3-1-F] to prevent water from freezing.Set the Dip SW as shown in the table
below.
DipSW3-6 External output contact
ON Effective when Thermo-ON
Effective when Operation-ON
OFF
(Remote controller-ON)
Be sure to turn on the power supply of the pump, since the control does not work if the power supply of the pump is turned
off.
*Refer to P59 "Flow switch installation" for details.
[Fig. 3-1-F]
MEES19K013
Example drawing for pump interlock
Board
AC220V ~ 240V
or
TB141A OUT1
DC30V or less
L
52P
F
WP
Control Box
Operation signal
Pump interlock
Strainer
Water Pump
N
MCB
F: Fuze
52P: Magnetic contactor for heat source water pump
52P
MCB: Circuit breaker
WP: Water pump
AIR TO WATER
Broken lines are field
supply products.
63