Ecodan 150 Standard - Heat Pump Primary Circuit Installation; HEAT PUMP SELECTION; WATER QUALITY AND SYSTEM PREPARATION

22
INSTALLATION - HEAT PUMP PRIMARY CIRCUIT
HEAT PUMP SELECTION
• The Pre-plumbed cylinders are suitable for use with the Mitsubishi Electric Ecodan Air Source heat pumps listed in Table
6 below
• If in doubt consult Mitsubishi Electric for further advice.
• Solid fuel boilers or any other boiler in which the energy input is not under effective thermostatic control unless additional
and appropriate safety measures are installed should NOT be used.
• The primary circuit can either be a sealed system or open vented type, maximum primary circuit pressure 3 bar.
• The primary ow from the heat pump MUST be pumped. Gravity circulation will not work due to the special design of the
primary heat exchanger.
• The heat pump cannot be vented through the Pre-plumbed cylinder unit.
Cylinder/HP Matrix
150Std 170Std 210Std 250Std 300Std 150Slim 170Slim 210Solar 250Solar 300Solar
X X X X X X
X X X X X X X X
X X X X X X X X
X X X X X X
Heat pump output kW
5
8.5
11.2
14
WATER QUALITY AND SYSTEM PREPARATION
General
The water in both primary and DHW circuits should be clean and with a pH value of 6.5 to 8.0
The following values should not be exceeded in the water supply conditions:
Calcium: 100mg/L
Ca hardness: 250mg/L
Chlorine: 100mg/L
Chloride: 250mg/L
Copper: 0.3mg/L
Iron/Manganese: 0.5mg/L
Other constituents should comply with European Directive 98/83 EC
In known hard water areas, to minimise any scaling the stored DHW temperature should be restricted to 60
o
C
Anti-freeze
Anti-freeze solutions MUST use propylene glycol with a toxicity rating of Class 1 as listed in the Clinical Toxicology of
Commercial Products, 5th Edition
Note:
1. Ethylene glycol is toxic and MUST NOT be used in the primary water ciruit in case of any cross contamination of the
potable water circuit
2. For 2 zone valve ON/OFF control, propylene glycol MUST be used
New and Existing Installations (primary water circuit)
Before connecting the outdoor unit, thoroughly cleanse the primary pipework of building debris, solder, uxes, etc. using a
suitable chemical cleansing agent.
Flush the system to remove the 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 the manufacturer’s instructions and ensure the product is
appropriate for the materials used in the water circuit.
Minimum amount of water required in the space heating circuit and required ow rates
Outdoor heat pump unit Min water content Required ow rate
PUHZ-W50 40 litres 14.3 L/min
PUHZ-W85 60 litres 25.8 L/min
PUHZ-W112 80 litres 32.1 L/min
PUHZ-HW140 100 litres 40.1 L/min
Table 6