Mitsubishi Electric CITY MULTI PWFY-P36NMU-E-BU Installation Manual page 11

② Water quality standard
Items
Chloride ion (mg Cl
Standard Sulfate ion (mg SO4
items
Acid consumption (pH4.8)
(mg CaCO
Total hardness (mg CaCO
Calcium hardness (mg CaCO
Ionic silica (mg SiO
Refer- Iron (mg Fe/ℓ)
ence
Copper (mg Cu/ℓ)
items
Ammonium ion (mg NH
Residual chlorine (mg Cl/ℓ)
Free carbon dioxide (mg CO
Ryzner stability index
Equipment. (JRA GL02E-1994)
③ Please consult with a water quality control specialist about water quality
control methods and water quality calculations before using anti-corro-
sive solutions for water quality management.
④ When replacing a previously installed air conditioning device (even when
Corrosion can occur in cold-water systems even if there has been no
prior signs of corrosion.
If the water quality level has dropped, please adjust water quality suf-
7.4. Pump interlock
The unit may become damaged if it is operated with no water circulating through
the pipes.
<PWFY-P36NMU-E-BU>
[Fig. 7.4.1] (P.4)
<PWFY-P36/72NMU-E2-AU>
<Pump interlock>
In the system including PWFY-P36/72NMU-E2-AU, the circulating water may
[Fig. 7.4.2] to prevent water from freezing.
[Fig. 7.4.2] (P.4)
Ⓐ Fuse
Ⓑ Coil of the magnetic contactor for heat source water pump
Ⓒ Double pole contact of the magnetic contacts for heat source water pump
Ⓓ
Ⓔ Water pump
Ⓕ
<Flow switch>
outlet side of the unit and connect the wire to IN1 of TB142A on the unit.
If the ow switch is not installed, the unit will emit the error signal (2100:
Interlock error) and not operate.
* A short-circuit wire is supplied, but it is only for test run.
8. Refrigerant pipe and drain pipe speci cations
refrigerant and drain pipes.
When using commercially available refrigerant pipes, be sure to wind commer-
cially available insulating material (with a heat-resisting temperature of more
①
Gas
Liquid
Drain
Lower mid-range temperature water system
Water Temp.
Recirculating water
7.0 ~ 8.0
30 or less 30 or less
[300 or less] [300 or less]
- /ℓ) 50 or less 50 or less
2- /ℓ) 50 or less 50 or less
50 or less 50 or less
/ℓ)
3
/ℓ) 70 or less 70 or less
3
/ℓ) 50 or less 50 or less
3
/ℓ) 30 or less 30 or less
2
1.0 or less 0.3 or less
1.0 or less 1.0 or less
not to be
2- /ℓ)
detected
+ /ℓ) 0.3 or less 0.1 or less
4
0.25 or less 0.3 or less
/ℓ) 0.4 or less 4.0 or less
2
–
PWFY-P36NMU-E-BU (mm) [in]
O.D.ø15.88 [5/8]
O.D.ø9.52 [3/8]
Higher mid-range temperature water system
Water Temp. >
Recirculating water
7.0 ~ 8.0 7.0 ~ 8.0
30 or less
[300 or less]
30 or less
30 or less
50 or less
70 or less
50 or less
30 or less
1.0 or less
1.0 or less
not to be not to be
detected detected
0.1 or less
0.1 or less
0.4 or less
– –
<Installation procedures>
① Remove the pipes attached to the ow 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 ngers around the threads and tape to press the tape into the threads.
Then, attach the pipes to the ow switch, holding parts A and B with a
spanner. The maximum tightening torque is 60 N . m (611 kgf . cm).
③ Attach the ow switch and pipes to the water outlet in the hori ontal
position.
The angle of the axis of the pipe should be less than 45 degrees.
Check the direction of the ow switch as shown in Fig. C.
④ Connect the ow switch wire to IN1 of TB142A.
A
C
PWFY-P36NMU-E2-AU 175 mm [6-
PWFY-P72NMU-E2-AU 205 mm [8-
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 set Dip SW3-6 to ON. (Otherwise, unit cannot operate.)
if the power supply of the pump is turned off.
Be also sure to wind commercially available insulating material (with a form
which pass through rooms.
Model
PWFY-P36NMU-E2-AU (mm) [in]
O.D.ø15.88 [5/8]
O.D.ø9.52 [3/8]
O.D.ø32 [1-1/4]
10 [13/32]
Tendency
Corrosive Scale-forming
7.0 ~ 8.0
30 or less
[300 or less]
30 or less
30 or less
50 or less
70 or less
50 or less
30 or less
0.3 or less
1.0 or less
not to be
detected
0.1 or less
0.3 or less
4.0 or less
–
Fig.C
Flow switch
B
C
C
15 / in]
16
1 / in]
8
PWFY-P72NMU-E2-AU (mm) [in]
O.D.ø19.05 [3/4]
O.D.ø9.52 [3/8]
11