Water Quality And System Preparation; Minimum Amount Of Water Required In The Space Heating/Cooling Circuit; New Installation (Primary Water Circuit); Existing Installation (Primary Water Circuit) - Mitsubishi Electric EHSC series Installationshandbuch

4
Installation
3. Referring to "How to access Internal Components and Control and Electrical Box", fix the unit to the back plate using the included 2 screws (accessory items).
Control and
electrical
box
<Figure 4.1.10>
Fix the unit using the 2 screws.
en
Control and
electrical box
<Figure 4.1.12>

4.2 Water Quality and System Preparation

General
• The water in both primary and sanitary circuit should be clean and with pH value of 6.5-8.0.
• The followings are the maximum values;
Calcium: 100 mg/L, Ca hardness: 250 mg/L
Chlorine: 100 mg/L, Copper: 0.3 mg/L
• Other constituents should be to European Directive 98/83 EC standards.l
• In known hard water areas, to prevent/minimise scaling, it is beneficial to restrict
the routine stored water temperature (DHW max. temp.) to 55°C.
Anti-Freeze
Anti-freeze solutions should use propylene glycol with a toxicity rating of Class 1
as listed in Clinical Toxicology of Commercial Products, 5th Edition.
Notes:
1. Ethylene glycol is toxic and should NOT be used in the primary water
circuit in case of any cross-contamination of the potable circuit.
2. For 2-zone valve ON/OFF control, propylene glycol should be used.

New Installation (primary water circuit)

• Before connecting outdoor unit, thoroughly cleanse pipework of building debris,
solder etc using a suitable chemical cleansing agent.
• Flush the system to remove chemical cleanser.
• For all packaged model systems, and the split model or PUMY system without
booster heater, add a combined inhibitor and anti-freeze solution to prevent
damage to the pipework and system components.
• For split model systems the responsible installer should decide if anti-freeze
solution is necessary for each site's conditions. Corrosion inhibitor however
should ALWAYS be used.

Existing Installation (primary water circuit)

• Before connecting outdoor unit the existing heating circuit MUST be chemically
cleansed to remove existing debris from the heating circuit.
• Flush the system to remove chemical cleanser.
• For all packaged model systems add a combined inhibitor and anti-freeze
solution to prevent damage to the pipework and system components.
• For split model systems the responsible installer should decide if anti-freeze
solution is necessary for each site's conditions. Corrosion inhibitor however
should ALWAYS be used.
When using chemical cleansers and inhibitors always follow manufacturer's
instructions and ensure the product is appropriate for the materials used in
the water circuit
13
Control and electrical box
Unit
< Figure 4.1.8 >
CAUTION: BEFORE performing field piping, be sure to fit and tighten these two screws.
Unit
Otherwise, the hook could be disengaged, and the unit could fall down.
Fix the unit using the 2 screws.
* If it is difficult to access with power
tool, use hand tool instead.
<Figure 4.1.11>
Minimum amount of water required in the space
heating/cooling circuit
Average / Warmer climate**
Indoor unit
Outdoor heat pump unit
containing
water
amount [L]
Packaged
PUZ-WM50
model
PUZ-WM60
PUZ-WM85 5
PUZ-WM112
PUZ-HWM140
Split
SUZ-SWM40
model
SUZ-SWM60
SUZ-SWM80
PUHZ-FRP71
PUHZ-SW75
PUHZ-SW100
PUHZ-SW120
PUHZ-SW160
5
PUHZ-SW200
PUHZ-SHW80
PUHZ-SHW112
PUHZ-SHW140
PUHZ-SHW230
PUMY-P112
PUMY-P125
PUMY-P140
<Table 4.2.1>
* If there is a bypass circuit, above table means minimum water amount in case
of bypass.
** Please refer to 2009/125/EC: Energy-related Products Directive and Regula-
tion (EU) No 813/2013 to confirm your climate zone.
Case 1. No division between primary and secondary circuit
• Please ensure the required water amount according to the table 4.2.1 by water
pipe and radiator or underfloor heating.
Case 2. Separate primary and secondary circuit
• If the interlock operation of primary and secondary pump is not available, please
ensure required additional water in only primary circuit according to the table 4.2.1.
• If the interlock operation of primary and secondary pump is available, please ensure
total water amount of primary and secondary circuit according to the table 4.2.1.
In case of the shortage of required water amount, please install buffer tank.
<Accessory>
Screw M5×8
Unit
Colder climate**
*Additional Indoor unit *Additional
required containing required
water water water
amount [L] amount [L] amount [L]
2 24
4 29
7 5 32
11 43
15 55
1 12
2 21
4 29
6 27
6 27
9 38
12 47
18 64
5
24 81
6 29
11 43
15 55
28 94
22 75
22 75
22 75