Dimplex A16M Manual de Instalação descarregar pdf (Página 12)

Space Heating Only DHW with A-Class

Cylinder

Water Flow Rate

@ 2100 l/h (nominal) @ 1800 l/h (typical)

Associated Head Available

14 kPa 18kPa

Diameter (mm) Internal Diameter (mm) Maximum Equivalent Length (m)

22* 19.8 7 11

28^

25.6 23 38

32 29.6 46 77

Table 1: Maximum Equivalent Length for Copper Pipe

*Only suitable for special conditions ^Recommended pipe diameter

Assuming straight length with

no incidents (e.g. elbows, tees)

 Isolation valves (non-return valve and ball

valve with strainer), supplied in the Dimplex

heat pump hydraulics pack, allow the strainer

to be removed and cleaned without having to

drain the system. Installation of these valves is

discussed in more detail in section 4.2.

 If multiple heat emitter circuits are installed,

operating at different flow and return

temperatures (such as under floor heating and

standard radiators), a mixing valve must be

used to prevent high temperature water from

entering the under floor heating manifold.

 Zone valves and pumps, if required, are sized

up by the installers to suit plumbing layout. A

suitable relay needs to be selected to energise

the pump.

 EC pumps must not be connected directly to

the wiring centre because of high inrush

current. An auxiliary relay must be used.

Table 1 shows guidelines for the maximum length of

pipe allowed to achieve nominal flow rates, depending

on pipe diameter.

NOTE: Not all types of pipe will have the same

internal diameter, e.g. multi-layered/plastic pipes will

have a thicker wall so the guidelines set out in table 1

will not apply. Microbore (8mm) and 15mm pipe is

not suitable.

As a rule of thumb, the equivalent straight length (L

[mm]) of each elbow is found by multiplying the outer

diameter of the pipe (D [mm]) by 30, e.g. 4 elbows of

diameter 22mm pipe is equivalent to 2.5m of 22mm

pipe.

3.6.1 Buffer tank

The heat pump uses a reverse cycle defrost in order

to defrost the evaporator, which is an automated

process when required in cold/moist weather

conditions. Therefore, it is necessary to connect a

buffer tank in series with the heat pump, as shown in

the hydraulic schematic diagrams (Appendix B). The

Dimplex A-Class cylinder range come with an

integrated buffer tank, which;

 Provides some energy storage for the unit to

carry out successful defrost.

 Increases compressor life due to reduction in

the number of starts.

It is recommended that a buffer with a heating

element/immersion is used as it may be required if

initial start-up and commissioning are carried out in

cold weather.

3.7 Electrical connections - Preparation

 Ensure the incoming power supply and the

distribution board are suitably rated.

 Ensure that the regulations specified by the

local electricity supplier have been adhered to.

 The supply cable must be suitable for the

installation location and sized to meet the

requirements of national wiring regulations for

current carrying capacity, disconnection time

and voltage drop; a minimum cross sectional

area of 6mm² steel wire armoured (SWA) cable

is recommended.

 The required controller cable is a shielded

MODBUS cable RS485, such as a 4 core 1mm²

24 AWG (Nominal impedance 120Ω) Foil and

Braid, which can be purchased from Dimplex as

an accessory.

 The user interface can be used as the

temperature thermostat in zone 1. The location

of the UI/zone 1 should be discussed before

installation with the end user. For multiple

zones, mechanical thermostats or NTC10

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 39 40

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Dimplex A16M Manual de Instalação Página 12

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