Pump Interlock; Refrigerant Pipe And Drain Pipe Specifications; Refrigerant Pipe, Drain Pipe And Filling Port; Connecting Refrigerant Pipes And Drain Pipes - Mitsubishi Electric CITY MULTI PWFY-P100VM-E-BU Manuel D'installation

7.4. Pump interlock

To perform test run before the pump interlock circuit is completed, short circuit the
terminal block TB142A (IN1), and then perform test run.
The unit may become damaged if it is operated with no water circulating through the
pipes.
<PWFY-P100VM-E-BU>
Be sure to interlock unit operation and the water-circuit pump. Use the terminal
blocks for interlocking TB142A (IN1) that can be found on the unit.
[Fig. 7.4.1] (P.2)
<PWFY-P100/200VM-E1-AU>
<Pump interlock>
In the system including PWFY-P100/P200VM-E1-AU, the circulating water may
freeze, and result in a unit malfunction. Perform the electrical work as shown in
[Fig. 7.4.2] to prevent water from freezing.
<Flow switch>
When installing the unit, be sure to install the supplied flow switch on the water outlet
side of the unit and connect the wire to IN1 of TB142A on the unit.
If the flow switch is not installed, the unit will emit the error signal (2100: Inter-
lock error) and not operate.
* A short-circuit wire is supplied, but it is only for test run.
<Installation procedures>
1 Remove the pipes attached to the flow switch.
Note: The unit is shipped with the pipes loosely tightened.
2 Wrap seal tape around the threads at the end of the pipes, starting at the
1.5th or 2nd thread, and not over the openings. Apply two to three wraps in
the direction of the pipe threads (clockwise). Each course of the tape should
overlap the one before it by 2/3 to 3/4 the width of the tape. Run your fingers
around the threads and tape to press the tape into the threads.
Then, attach the pipes to the flow switch, holding parts A and B with a span-
ner. The maximum tightening torque is 60 N•m (611 kgf•cm).
3 Attach the flow switch and pipes to the water outlet in the horizontal posi-
tion.
The angle of the axis of the pipe should be less than 45 degrees.
Check the direction of the flow switch as shown in Fig. C.
4 Connect the flow switch wire to IN1 of TB142A.

8. Refrigerant pipe and drain pipe specifications

To avoid dew drops, provide sufficient antisweating and insulating work to the refrig-
erant and drain pipes.
When using commercially available refrigerant pipes, be sure to wind commercially
available insulating material (with a heat-resisting temperature of more than 100 ˚C
1 Select the thickness of insulating material by pipe size.
Model
Gas
Liquid
Drain
Insulating material's thickness
2 If the unit is used on the highest story of a building and under conditions of high
temperature and humidity, it is necessary to use pipe size and insulating mate-
rial's thickness more than those given in the table above.

8.1. Refrigerant pipe, drain pipe and filling port

[Fig. 8.1.1] (P.3)
A Refrigerant piping (gas)
C Water inlet
E Drain outlet

9. Connecting refrigerant pipes and drain pipes

9.1. Refrigerant piping work

This piping work must be done in accordance with the installation manuals for both
outdoor unit and BC controller (simultaneous cooling and heating series R2).
PWFY-P100VM-E-BU
ø15.88
ø9.52
B Refrigerant piping (liquid)
D Water outlet
*1: PWFY-P100/200VM-E1-AU
A
C
C
PWFY-P100VM-E1-AU 175 mm
PWFY-P200VM-E1-AU 205 mm
Set the DipSW as shown in the table below.
DipSW3-6 External output contact
ON Effective when Thermo-ON
OFF Effective when Operation-ON (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.
<PAC-SV01PW-E>
Connect the wiring as shown in [Fig. 7.4.3] when interlocking the pump operation
with other units AND connecting a Solenoid valve kit (PAC-SV01PW-E) to a system
that includes Y-series, HP(ZUBADAN)-series outdoor units, indoor units, and
PWFY-P100/P200VM-E1-AU.
Set Dip SW3-6 to ON. Make sure the version of the software is 1.18 or later.
[Fig. 7.4.3]
Board
TB141A OUT1
L N
F
52
P
AC220V ~ 240V
1 2 3 L N
TB1
F: Fuze
52P: Magnetic contactor for heat source water pump
and thickness given below) onto both liquid and gas pipes.
Be also sure to wind commercially available insulating material (with a form polyeth-
ylene's specific gravity of 0.03 and thickness given below) onto all pipes which pass
through rooms.
PWFY-P100VM-E1-AU
ø15.88
ø9.52
ø32
More than 10 mm
3 If there are customer's specifications, simply follow them.
• Series R2 is designed to operate in a system that the refrigerant pipe from an out-
door unit is received by BC controller and branches at the BC controller to connect
between indoor units.
• For constraints on pipe length and allowable difference of elevation, refer to the
outdoor unit manual.
• The method of pipe connection is brazing connection.
Fig.C
Flow switch
B
C
AC220V ~ 240V
or
DC30V or less
L
PWFY
Solenoid
valve kit
TB2
WP
MCB: Circuit breaker
WP: Water pump
PWFY-P200VM-E1-AU
ø19.05
ø9.52
N
MCB
52P
9