Daikin VRV Manuale utente

VRV Reference

Guide

About Daikin:

Daikin Industries, Ltd. (DIL) is a global Fortune 1000

company which celebrated its 90th anniversary in

May 2014. The company is recognized as one of the largest

HVAC (Heating, Ventilation, Air Conditioning) manufacturers

in the world. DIL is primarily engaged in developing

indoor comfort products and refrigeration systems

for residential, commercial and industrial applications.

Its consistent success is derived, in part, from a focus

on innovative, energy-efficient and premium quality indoor

climate and comfort management solutions.

A WORLD LEADING

MANUFACTURER

OF HVAC PRODUCTS

OPERATING

F O U NDE D

IN 1924

R E S E A R C H

DEVELOPMENT

OVER $300 MILLION

OVER 60,0000 DAIKIN VRV SYSTEMS

THROUGHOUT NORTH AMERICA

TABLE OF CONTENTS

SYSTEM OVERVIEW

The Features of VRV .........................................................6

Key Points For Selection ...................................................8

Application Limits ..........................................................13

Nomenclature .................................................................17

Piping and Wiring Guide ................................................18

SYSTEM SELECTION

Indoor Unit Range ..........................................................24

Indoor Unit Consideration ..............................................26

Zoning VRV Systems with DZK ......................................30

Heat Pump or Heat Recovery? ......................................32

Air Cooled or Water Cooled? .........................................35

Solutions For Ventilation ................................................38

DESIGN OPTIMIZATION

System Zoning ...............................................................42

Branch Selector Boxes .................................................. 44

Single or Multi BSV Boxes? ...........................................45

Optimized Pipe Routes ...................................................47

Outdoor Unit Installation Space .....................................48

Heat Pump Changeover .................................................50

CONTROLS & STANDARDS

Controls Portfolio .......................................................... 54

Local Control Options ....................................................58

Featured Controls............................................................59

Codes & Standards ........................................................61

Tips & Considerations ....................................................62

Further Documents & Data ............................................63

System

Overview

The Features of VRV

Features & Beneﬁts to Using VRV

A VRV system is similar to a chiller but circulates refrigerant

to each zone instead of water

A VRV heat pump system has performance and design

attributes similar to a 2 pipe chiller

A VRV heat recovery system has performance and design

attributes similar to a 4 pipe chiller system

»Industry Leadership since 1982, VRV is a registered TM

»8 development series and 4 generations of VRV technology

»Scalable project opportunities with modular design

»Broad coverage of most vertical markets and climates

»Tested and Rated in accordance with AHRI Std 1230

»Individual zone control for Advanced zoning capabilities

»Can operate up to 64 indoor fan coil units

»Auto charging function

»Continuous heating during defrost operation

»Flexible piping limitations to meet a variety of building needs

»Excellent energy efficiency, especially at part load conditions (IEER)

»Daikin’s optimized scroll

compressor designed

for R-410A provides a

quiet, reliable energy-

efficient operation

»Anti-corrosion treatment

standard on exterior metal

parts and heat exchanger

»Fully compatible with the complete

Daikin control suite including iTC,

and iTM

»Tie in to open protocol Building

Automation systems through

LonWorks®and BACnet®gateways

»10-Year Limited Parts Warranty*

* Complete warranty details are available from your local Daikin manufacturer’s

representative or distributor or online at www.daikincomfort.com.

IEER Ratings

6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38

Nominal Capacity (Ton)

IEER (Integrated Energy Efﬁciency Ratio)

VRV IV HP

VRV IV HR

ASHRAE 90.1 2016

Air Cooled HP

ASHRAE 90.1 2016

Air Cooled HP

SYSTEM OVERVIEW

Simple Modular Design

The beneﬁts of VRV equipment can be categorized by three

core features:

Direct expansion systems (those

that use refrigerant to directly

condition the space) provide an

extremely efficient method of

heat exchange.

Inverter controlled compressors

also ensure optimized system

performance.

Optimum refrigerant & system

control sees Daikin VRV

far exceed industry energy

efﬁciency requirements.

From controlling temperature in individual areas to the remote

monitoring and control of multiple sites, the Daikin VRV system has a

wealth of propriety control options to cover all end user requirements

and ensuring exceptional levels of comfort control.

Wireless unit

Controller

Room or Group

Controller Central Controller BMS Interface

Ultra-High Energy Efﬁciencies

Exceptional Comfort control

The ease of both design and installation has been a major factor in the

success of VRV in the global market. Simple methodology sees VRV

regularly utilized in all project sizes from 3 ton to several 1,000 ton.

Outdoor Unit Indoor Units Piping Controls

A fully optimized design can realize a

number of beneﬁts:

»Cheaper equipment & installations costs

»Less outdoor unit footprint

»A greater energy efficient system

»Far better control of room temperature

»A significant increase in the probability of

winning a project

Key Points for Selection

System Diversity vs Connection Ratio

Unit Type Selection Scope Selection Approach

PEAK Load

Each Indoor unit should be sized

to deliver the PEAK load (total

and/or sensible) of the area it

is to serve, at the entering air

design conditions, determined

by the building load calculations

BLOCK Load

Outdoor units should be

selected to meet the BLOCK

Cooling & Heating capacities

(The maximum simultaneous

load demand of all attached

indoor units at a given time of

day) determined by the same

LOAD Calculations

Optimizing VRV System Selection

»The most successful users of VRV equipment understand the

importance of a fully optimized design

»A key factor that ensures optimized VRV equipment selection

is to understand the correlation between SYSTEM DIVERSITY

& CONNECTION RATIO

Peak Loads & Block Loads

The first step to optimization is to understand the different load

demands of the equipment to be selected:

Connection Ratio:

»Both indoor & outdoor units have a Capacity Index number

(e.g. FXMQ30PBVJU indoor unit & RXYQ192TTJU outdoor unit)

Total sum of IDU

index numbers

ODU index number

CONNECTION RATIO

»This ratio is defined as a percentage:

Example: 8 x FXMQ

P connected to 1 x RXYQ

192

T= 240 / 192 = 1.25

–Therefore the Connection Ratio = 125%

System Diversity:

System DIVERSITY is the difference between the Maximum System

Load demand and the Maximum Capacity of the outdoor unit,

at design conditions

»The VRVXpress tool can define diversity - also as a percentage

Example: 8 x FXMQ30P connected to 1 x RXYQ168T

–Maximum Load required at any given time: 170,269 btu

–Maximum Capacity of the ODU at design conditions: 166,315 btu

–VRV defines the DIVERSITY of the system at: -2%

»In this example, if the maximum load is called for, the outdoor unit

will fall short of demand by 3,954btu – This VRV design has a 2%

system diversity

In Summary:

Connection Ratio does NOT indicate the diversity of a VRV

system. Use of the VRVXpress selection tool will indicate

clearly if selected equipment has a system diversity or not.

System Diversity & Connection Ration – What's the Difference?

Key Points for Selection

Obtain Project Data

Before selection of any VRV system, a minimum amount of information

is required for accurate equipment selection and to apply an

optimized design

For an accurate selection of indoor units the following information is required:

For an accurate selection of outdoor units the following information is required:

PEAK

Cooling Loads

PEAK

Heating Loads

DESIGN AIR

Conditions

»Engineers will

usually provide

both Total &

Sensible loads

which should

be entered

»However it is

possible to select

equipment using

only Total or

Sensible load

»Required when

either Heating

is the dominant

operation or the

heating design

condition is

below 32°F

»The dry & wet bulb

temperature entering

the coil

»Also known as

“air-on” or “mixed air”

conditions

»Nominal conditions are

typically 80 °F db &

67 °F wb but rarely

reflect actual conditions

»Design air-on can also

be given as db/RH%

(e.g. 74°F & 50% RH)

AMBIENT Conditions PIPE LENGTH

»The design ambient

temperature for the

location of the project

»Both engineers and D&B

contractors should have

this information

»If this information is not at

hand then use ASHRAE

standard design conditions

for the location

»The estimated distance between

the outdoor unit and the furthest

indoor unit

»This is the linear length from one

point to another NOT the total

amount of piping

»Both engineers and D&B

contractors should be able to pin

point the outdoor unit location

»Be sure to calculate and include

the vertical height between

outdoor & furthest indoor unit

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