Daikin VRV User manual

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

6
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)
28
26
24
22
20
18
16
14
12
10
30
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
7
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

8
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:

9
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 30 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?

10
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