Water Quality And System Preparation; Water Pipe Work - Mitsubishi Electric EHPT Serie Manual De Instalación

4
Installation

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
Chloride: 100 mg/L, Copper: 0.3 mg/L
• Other constituents should be to European Directive 98/83 EC standards.
• 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)
en
• 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 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, 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.
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

4.3 Water Pipe Work

Hot Water Pipework
The cylinder unit is UNVENTED. When installing unvented hot water sys-
tems building regulations part G3 (England and Wales), P3 (Scotland) and P5
(Northern Ireland) should be adhered to. If outside of the UK please adhere to
your own country's regulations for unvented hot water systems.
Connect the flow for the DHW to pipe A (Figure 3.1).
The function of the following safety components of the cylinder unit should be
checked on installation for any abnormalities;
• Pressure relief valve (Primary circuit and Tank)
• Expansion vessel pre-charge (gas charge pressure)
The instruction on the following pages regarding safe discharge of hot water from
Safety devices should be followed carefully.
• The pipework will become very hot, so should be insulated to prevent burns.
• When connecting pipework, ensure that no foreign objects such as debris or the
like enter the pipe.
Cold Water Pipework
Cold water to the suitable standard (see section 4.2) should be introduced to the
system by connecting pipe B (Figure 3.1) using appropriate fittings.
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
PUD-S(H)WM60
PUD-S(H)WM80
PUD-S(H)WM100
PUD-S(H)WM120
PUD-SHWM140
PUHZ-FRP71
5
PUHZ-SW75
PUHZ-SW100
PUHZ-SW120
PUHZ-SHW80
PUHZ-SHW112
PUHZ-SHW140
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
Regulation (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.
Negative pressure prevention
To prevent negative pressure effecting DHW tank, installer should install appropriate
pipework or use appropriate devices.
Hydraulic filter work (ONLY E*PT series)
Install a hydraulic filter or strainer (local supply) at the water intake ("Pipe E" in
Fig.3.1)
Pipework Connections
Connections to the cylinder unit should be made using the 22 mm or 28 mm
compression as appropriate.
When connecting DHW pipes using compression fittings, insert copper liner for
DHW pipe (accessory parts) into the pipes and tighten them from 0.75 to 1.25
turns.
Do not over-tighten compression fittings as this will lead to deformation of the olive
ring and potential leaks.
Note: Before brazing pipes in the field, protect pipes on the cylinder unit using
wet towels etc as "heat shield".
Insulation of Pipework
• All exposed water pipework should be insulated to prevent unnecessary heat loss
and condensation. To prevent condensate entering the cylinder unit, the pipework
and connections at the top of the cylinder unit should be carefully insulated.
• Cold and hot water pipework should not be run close together where possible, to
avoid unwanted heat transfer.
• Pipework between outdoor heat pump unit and cylinder unit should be insulated
with suitable pipe insulation material with a thermal conductivity of ≤ 0.04 W/m.K.
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
4 21
6 29
9 38
12 47
15 55
6 27
5
6 27
9 38
12 47
6 29
11 43
15 55
22 75
22 75
22 75