4
2. Installation location
2.1. Refrigerant pipe
Refer to Fig. 4-1.
2.2. Choosing the outdoor unit installation location
• Avoid locations exposed to direct sunlight or other sources of heat.
• Select a location from which noise emitted by the unit will not inconvenience neigh-
bors.
• Select a location permitting easy wiring and pipe access to the power source and
indoor unit.
• Avoid locations where combustible gases may leak, be produced, flow, or accumu-
late.
• Note that water may drain from the unit during operation.
• Select a level location that can bear the weight and vibration of the unit.
• Avoid locations where the unit can be covered by snow. In areas where heavy snow
fall is anticipated, special precautions such as raising the installation location or
installing a hood on the air intake must be taken to prevent the snow from block-
ing the air intake or blowing directly against it. This can reduce the airflow and a
malfunction may result.
• Avoid locations exposed to oil, steam, or sulfuric gas.
• Use the transportation handles of the outdoor unit to transport the unit. If the unit
is carried from the bottom, hands or fingers may be pinched.
2.3. Outline dimensions (Outdoor unit) (Fig. 2-1)
Constraints on indoor unit installation
You should note that indoor units that can be connected to this outdoor unit are the
following models.
• Indoor units with model numbers 15-140 (PUMY-P100:15-125) can be connected.
Refer to the table 1 below for possible room, indoor unit combinations.
Verification
The rated capacity should be determined by observing the table below. The unit’s
quantities are limited as shown in the following table 2. For the next step, make
sure that the total rated capacity selected will stay in a range of 50% - 130% of the
outdoor unit capacity.
• PUMY-P100
5.6 - 14.6 kW
• PUMY-P125
7.1 - 18.2 kW
• PUMY-P140
8.0 - 20.2 kW
Table 1
Indoor unit type
15
20
25
32
40
50
63
71
80
100
125
140
Rated capacity
(Cooling) (kW)
1.7
2.2
2.8
3.6
4.5
5.6
7.1
8.0
9.0
11.2
14.0 16.0
Table 2
Connectable indoor units quantities
PUMY-P100
1-8
PUMY-P125
1-10
PUMY-P140
1-12*
Combinations in which the total capacity of indoor units exceeds the capacity of the
outdoor unit will reduce the cooling capacity of each indoor unit below their rated
cooling capacity. Thus, combine indoor units with an outdoor unit within the outdoor
unit’s capacity, if possible.
* Only when all the indoor units are 1.5 kW models, 12 indoor units can be connected
to 1 outdoor unit.
2.4. Connecting a PWFY Unit
When using a PWFY unit as an indoor unit, be aware of the following points
because the PWFY unit is different from other indoor units.
2.4.1. Connection restrictions
• Only 1 PWFY-P100VM-E-AU can be connected. PWFY-P200VM-E-AU and PWFY-
P100VM-E-BU cannot be connected.
• The PWFY unit cannot be the only unit connected to an outdoor unit. Select an
outdoor unit so that the total rated capacity of the indoor units, excluding the PWFY
unit, is 50–100% of the outdoor unit capacity.
Limits for the total rated capacity of the indoor units when connecting a PWFY unit
• PUMY-P100 (1 PWFY unit + Non-PWFY units [5.6–11.2 kW])
• PUMY-P125 (1 PWFY unit + Non-PWFY units [7.1–14.0 kW])
• PUMY-P140 (1 PWFY unit + Non-PWFY units [8.0–15.5 kW])
2.4.2. Indoor unit specifications
When connecting a PWFY unit to a PUMY unit, the following specifications will
change.
• The PWFY unit can operate only in heating mode. The PWFY unit cannot operate
in cooling mode. However, the indoor units other than the PWFY unit can operate
in cooling mode.
• The other indoor units cannot operate at the same time as the PWFY unit.
• The operation of the PWFY unit has priority. When the PWFY unit is in the operation
mode, the other indoor units will stop.
• The temperature setting of the remote controller is the target value for the outlet
water temperature.
2.4.3. Switch settings (Fig. 2-2)
When connecting a PWFY unit to a PUMY unit, set DIP switches SW1-1, SW4-2, and
SW4-6 of the PWFY unit to ON.
2.4.4. Test run
If the test run is carried out using the outdoor unit switches, the PWFY unit will
not operate. Carry out the test run using the PWFY unit switches or the remote
controller.
For information about carrying out the test run, refer to the data book or the service
manual for the PWFY unit.
2.4.5. Refrigerant collecting (Pump down)
Step
in the pump down procedure instructs the user to “operate all indoor units
in cooling mode”. However, the PWFY unit will not operate in cooling mode.
Operate all of the indoor units, excluding the PWFY unit, in cooling mode.
Fig. 2-1
(mm)
950
330+30
1350
175
600
370
Table 3 PWFY unit specifications
Model
PWFY-P100VM-E-AU
Temp. range of
Heating
Outdoor temp.
–15 to 21°C (DB), –15 to 15°C (WB)
Inlet Water temp.
10 to 45°C
Temp. range of
Cooling
Outdoor temp.
–
Inlet Water temp.
–
SW1
1
2
3
4
5
6
7
8
9 10
ON
SW4
1
2
3
4
5
6
7
8
9 10
ON
Fig. 2-2
