Water Quality And System Preparation - Mitsubishi Electric ecodan EHPT20Q-VM2EA Installation Manual

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Installation
Service access diagrams
Service access
Parameter
a
b
c (distance behind unit not visible in Figure 4.1.3)
d
<Table 4.1.1>
Suffi cient space MUST be left for the provision of discharge pipework as
a detailed in National and Local Building Regulations.
The cylinder unit must be located indoors and in a frost-free environment,
for example in a utility room, to minimise heat loss from stored water.
b b
d
<Figure 4.1.3>
Service access
Room Thermostat
If fi tting a new room thermostat for this system;
• Position it out of direct sunlight and draughts
• Position it on an internal wall
• Position it away from internal heat sources
• Position it in a room without a TRV on the radiator/heat emitter.
Note:
Do not position the thermostat excessively close to the external wall. The thermostat may
detect the temperature of the wall, which could affect appropriate control of the room
temperature.
• Position it approx. 1.5 m from fl oor level
Repositioning
If you need to move the cylinder unit to a new position FULLY DRAIN the cylinder unit before
moving to avoid damage to the unit. Also, take care to protect building fabrics (fl oor and wall
fi nishes).
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Dimension (mm)
300
150
10
500
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Installation

4.2 Water Quality and System Preparation

General
• The water in both primary and secondary (potable) circuit should be clean and with pH value of
6.5-8.0.
• The followings are the maximum values;
Calcium: 100mg/L, Ca hardness: 250mg/L
Chlorine: 100mg/L, Copper: 0.3mg/L
Iron/Manganese: 0.5mg/L
• Other constituents should be to European Directive 98/83 EC standards.
• In known hard water areas, to prevent/minimise scaling, it is benefi cial to restrict the routine
stored water temperature (DHW supply max. temp.) to 65°C or less.
Anti-Freeze
Suitable anti-freeze MUST be used in ALL installations.
Anti-freeze solution MUST be propylene glycol with a toxicity rating of Class 1 as listed in Clinical Toxicology of
Commercial Products, 5th Edition.
Note:
1. Ethylene glycol anti-freeze is TOXIC. Therefore it MUST NOT be used in the primary
water circuit in case of any cross-contamination of the secondary (potable) circuit.
2. For 2-zone valve ON/OFF control, propylene glycol solution MUST 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.
• Add a combined inhibitor and anti-freeze solution to prevent damage to the pipework and system components.
Existing Installation (primary water circuit)
• Before connecting outdoor unit the existing heating circuit MUST be chemically cleansed to remove existing dirt
and debris from the heating circuit.
• Flush the system to remove chemical cleanser.
• Add a combined inhibitor and anti-freeze solution to prevent damage to the pipework and system components.
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
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