Trane 4TVH0036B100NB, 4TVH0048B100NB, 4TVH0053B100NB Installation and Maintenance Manual

Installation

Variable Refrigerant Flo w (VRF) System

Mini Outdoor Unit Series

Models:

Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, and air-conditioning equipment can be hazardous and requires specific knowledge and tr aining. Impr op er ly in stalled, adjust ed or alt er e d equipment b y an unqualified person could result in death or serious injury. When working on the equipment, observe all precautions in the literature and on the tags, stickers, and labels that are attached to the equipment.

May 201 3 VRF-SVN33A-EN

4TVH0036B100NB 4TVH0048B100NB 4TVH0053B100NB

SAFETY WARNING

Introduction

Read this manual thoroughly before operating or servicing this unit.

Warnings, Cautions, and Notices

Safety advisories appear throughout this manual as required. Y our personal safety and the proper operation of this machine depend upon the strict observance of these precautions.

The three types of advisories are defined as follows:

WARNING

CAUTIONs

NOTICE

Important Environmental Concerns

Scientific research has shown that certain man-made chemicals can affect the earth’s naturally occurring stratospheric ozone layer when released to the atmosphere. In particular, several of the identified chemicals that may affect the ozone layer are refrigerants that contain Chlorine, Fluorine and Carbon (CFCs) and those containing Hydrogen, Chlorine, Fluorine and Carbon (HCFCs). Not all refrigerants containing these compounds have the same potential impact to the environment. T rane advocates the responsible handling of all refrigerantsincluding industry replacements for CFCs such as HCFCs and HFCs.

Important Responsible Refr iger ant Pr actices

Trane believes that responsible refrigerant practices are important to the environment, our customers, and the air conditioning industry. All technicians who handle refrigerants must be certified. The Federal Clean Air Act (Section 608) sets forth the requirements for handling, reclaiming, recovering and recycling of certain refrigerants and the equipment that is used in these service procedures. In addition, some states or municipalities may have additional requirements that must also be adhered to for responsible management of refrigerants. Know the applicable laws and follow them.

Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

Indicates a potentially hazardous situation which, if not avoided, could result in minor or moderate injury. It could also be used to alert against unsafe practices.

Indicates a situation that could result in equipment or property-damage only.

WARNING

Proper Field Wiring and Grounding Required!

Failure to follow code could result in death or serious injury. All field wiring MUST be performed by qualified personnel. Improperly installed and grounded field wiring poses FIRE and ELECTROCUTION hazards. To avoid these hazards, you MUS T follo w requir ements for field wiring installation and grounding as described in NEC and your local/state electrical codes.

WARNING

Personal Protective Equipment (PPE) Required!

Failure to w ear proper PPE for the job being undertaken could result in death or serious injury. Technicians, in order to protect themselves from potential electrical, mechanical, and chemical hazards, MUST follow precautions in this manual and on the tags, stickers, and labels, as well as the instructions below:

• Before installing/servicing this unit, technicians MUST put on all PPE recommended for the work being undertaken. ALWAYS refer to appropriate MSDS sheets and OSHA guidelines for proper PPE.

• When working with or around hazardous chemicals, ALWAYS refer to the appropriate MSDS sheets and OSHA guidelines for information on allowable personal exposure levels, proper respiratory protection, and handli ng recommendations.

• If there is a risk of arc or flash, tec hnicians MUST put on all PPE in accordance with NFPA 70E or other country-specific requirements for arc flash protection, PRIOR t o servicin g the un it.

This document and the information in it are the property of Trane and may not be used or reproduced in whole or in part, without the written permission of Trane. Trane reserves the right to revise this publication at any time and to make changes to its content without obligation to notify any person of such revision or c hange.

Trademarks

All trademarks referenced in this document are the trademarks of their respective owners.

2 VRF-SVN33A-EN

Table of Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Warnings, Cautions, and Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Preparing for Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Unit Dimensions and Weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Dimensional Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Maximum Quantity of Indoor Units by Mini Outdoor Unit Capacity . . . . . . . 6

Service Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Location Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Moving the Mini Outdoor Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Unit Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Base Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Securing the Mini Outdoor Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Condenser Air Discharge Duct (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Important Environmental Concerns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Important Responsible Refrigerant Practi ce s . . . . . . . . . . . . . . . . . . . . . . . 2

General guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Minimizing Vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Refrigerant Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Selecting Refrigerant Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Pipe Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Branch Joint Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Pipe Thickness and Temper Grade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Refrigerant Piping Maximum Length and Height Differences . . . . . . . . 15

Storing Refrigerant Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Evacuating Refrigerant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Installing Refrigerant Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Pipe Cutting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Nitrogen Flushing While Brazing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Flared Pipe Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Connecting Piping to the Mini Outdoor Unit . . . . . . . . . . . . . . . . . . . . . . 21

Refrigerant Piping Installation Examples . . . . . . . . . . . . . . . . . . . . . . . . . 22

Electrical Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Power Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Installing a Grounding Rod . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Installing the Grounding Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Communications Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Leak Testing Pipe Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

VRF-SVN33A-EN 3

Vacuum Drying Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Insulating Refrigerant Pipes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Refrigerant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Calculating the Refrigerant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Charging the Refrigerant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Connecting the Drain Hose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Control System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

System Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Configuring the System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Initiating System Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Monitoring System Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Pre-Start Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Test Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Refrigerant detection operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Service: Pump Down Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Collecting Refrigerant into a Refrigerant Container . . . . . . . . . . . . . . . . . . . . 47

Pump Down Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Warranty For Trane Advantage™ VRF Systems and Related Accessories . . . 49

Basic Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Exclusions and Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

4 VRF-SVN33A-EN

Preparing for Installation

No. Item Dimension/Size

1 Gas refrigerant pipe

3, 4 ton: 5/8 (15.88) 5 ton: 3/4 (19.05)

2 Liquid refrigerant pipe 3/8 (9.52)

3 Condensate drain holes 0.79 (20)

4 Communication cable holes 0.87 (22.2) x 3

5 Power cable holes 1.36 (34.5) x 3

Unit Dimensions and Weights

Table 1. Unit dimensions and weights

Preparing for Installation

Unit model number

4TVH0036B100NB

4TVH0048B100NB

4TVH0053B100NB 227.1 (103.0) 238.1 (108.0)

Dimensions (WxHxD)

in. (mm)

37 (940) x 47.6 (1210) x 13 (330)

Weight lb (kg)

220.5 (100.0)

Shipping dimensions

(WxHxD)

in. (mm)

39.2 (995) x 53.9 1368) x 16.8 (426)

Shipping weight

lb (kg)

231.5 (105.0)

Dimensional Drawing

Unit : inch (mm)

46.65 (1185)

37.01 (940)

47.64 (1210)

12.99 (330)

14.17 (360)

24.42 (620)

VRF-SVN33A-EN 5

0.98 (25)

21.97 (558)

22.32 (567)

15.12 (384)

4: Ø 0.47 (12)

34.84 (885)

Preparing for Installation

Maximum Quantity of Indoor Units by Mini Outdoor Unit Capacity

To prevent reducing indoor unit capacity, the sum capacity of indoor units connected to a mini outdoor unit should be no greater than the capacity of the mini outdoor unit. Refer to Table 2.

Table 2. Maximum number of indoor units determined by mini outdoor unit capacity

Mini outdoor unit

model number

4TVH0036B100NB 3 6 19000–49000

4TVH0048B100NB 4 8 24000–62000

4TVH0053B100NB 5 9 27000–69000

Mini outdoor unit

capacity

(tons)

Maximum quantity

of indoor units

connected to a mini

outdoor unit

Total capacity of connected

indoor units

(Btu/h)

6 VRF-SVN33A-EN

Service Clearances

Side view

Top view

Back

Front

Back

12 (300)

60 (1500)

80 (2000)

12 (300)

6 (150)

24 (600)

60 (1500)

12 (300)

When the air outlet is opposite a wall

When air outlet is toward a wall

When three sides are blocked by a wall

Top of unit is blocked and the air outlet is toward a wall

When top of unit is blocked and the air outlet is opposite the wall

When from and back of unit are blocked by walls

Install units as shown in the illustrations below (Figure 1, Figure 2, and Figure 3), observing ventilation and service requirements. Space requirements are based on cooling mode operation and an outdoor temperature of 95°F (35°C). More space is required if the outdoor temperature is higher than 95°F (35°C) or if the area is easily heated by solar radiation.

Note: The front of the unit is curved and has the name brand logo on it.

Figure 1. Air flow dire ction

Figure 2. Minimum service clearances for a single mini outdoor unit installation

Preparing for Installation

VRF-SVN33A-EN 7

20 (500)

Preparing for Installation

12 (300)

24 (600)

12 (300)

60 (1500)

60 (1500) 24 (600)

120 (3000)

12 (300)

120 (3000)

Figure 3. Minimum service clearances for multiple mini outdoor unit installations

Location Considerations

Choose an installation location based on the following consider ations.

• Install the outdoor unit: – On a suppo rting structure that can bear the weight of the outdoor unit. – With sufficient clearances around the unit for service and repairs. – Install the outdoor unit. – On a flat surface that does not collect rain water. – In a well ventilated location. – Away from strong wind. – Away from direct exposure to rain or snow. – Where there is no risk of flamma ble gas leakage – Where there is no exposure to salt, machine oil, sulfide gas, or corrosive environmental

conditions.

– Away from sea breeze.

Note: For seacoast applications, bloc k the unit from direct exposure to sea breez e by installing

the unit behind a structure (suc h as a building) or a protective wall that is 1 .5 t imes higher than the unit, leaving 28 in. (700 mm) of space between the wall and unit for air

8 VRF-SVN33A-EN

Preparing for Installation

ODU

Sea breeze

Sea

Sea breeze

ODU

Protection walls

circulation. Consult an installation expert about taking anti-corrosion measures, suc h as removing salinity on the heat exchanger and applying a rust i nhibitor more frequen tly than once a year.

– At least 9.84 ft (3 m) away from equipment that generates electromagnetic waves. – Away from interfering sources, such as radio, computer, and stereo equipment. – Far enough away from people living and working nearby so that hot discharge air or noise

do not disturb them.

– Away from inflammable materials.

• Ensure that condensate water generated b y the outdoor unit can drain smoothly away from the unit.

• Install the power and communication cables in a separately installed enclosure.

• If installing on a high place such as a roof, with a fence or guard rail around it.

• If there is a potential for accumulated snow to block the air inlet or heat exc hanger, install the unit on a higher base.

• R-410A refrigerant is a safe, nontoxic and nonflammable refrigerant. However, if there is a concern about a dangerous level of refrigerant concentration in the case of refrigerant leakage, add extra ventilation.

• Avoid in stalling the o utdoor unit w here cor rosive g ases, suc h as sulfur o xides, ammonia, and sulfurous gas, are produced. If unavoidabl e, consult with an installation specialist about using a corrosion-proof or anti-rust additive to protect the unit coils.

Moving the Mini Outdoor Unit

Follow these guidelines when moving the mini outdoor unit:

• Before moving the unit, determine a path that can support its weight.

• Do not lay the unit on its side and do not slant the unit more than 30 degrees.

• Take care to avoid injury while moving the unit; the surface of the heat exchanger is sharp. – If moving the unit with a crane, fasten the wire rope as shown in Figure 4. T o protect damage

or scratches to the unit, use a spreader bar.

– If the unit is being moved a short distance by hand, two people should lift and carry it

together using the transportation handles on the side of the unit, as shown in Figure 4.

VRF-SVN33A-EN 9

Figure 4. Moving the mini outdoor unit

Moving by hand

Wire rope/straps

Moving with a crane

Transportation handles

Spreader bar

Wood palette

Ground installation

Base installation: Surface of base must be horizontally level

6 in. (150 mm) min.

Drain pit

6 in. (150 mm) min.

Raised base

6 in. (150 mm) minimum

Unit Installation

Follow these guidelines for installing the mini outdoor unit.

Important: The manufacturer is not responsible for d amage incurred for installatio ns that have

The unit must be installed:

• On a horizontally level surface.

• On a surface that is strong enough to support the unit and to minimize noise.

not followed these guidelines.

Base Recommendations

General guidelines

A supporting base for the mini outdoor unit:

• Is typically made of concrete.

• Should typically be 1 .5 tim es larger than the bottom of the unit. However , for installatio ns that are subject to snow accumulation, the base should be no larger than the bottom of the unit.

• Should be 6 in. (150 mm) or higher to protect the unit from rain water or other conditions that may cause damage to the unit.

Note: The base height or , if the unit is installed on a frame (see “Minimizing V ibration ” p. 11),

the base height plus the frame height, should be greater than the highest expected snowfall.

• If necessary, has wire mesh or steel bars added to the concrete to prevent damages or cracks.

10 VRF-SVN33A-EN

Minimizing Vibration

Outdoor unit

Anchor bolt with nut/spring/washer

Isolation pad minimum thickness:  1 in. (20 mm)

H-beam

3 in. (75 m m) min.

A: Width of unit mounting foot

1 in.

(20 mm)

Base

Isolation pad dimensions: A + 1/2 to 1 in. (10–20 mm) minimum

Ensure that bolts are loose.

When installing multiple mini outdoor units side by side, or when there is a need to minimize unit vibrations, use a vibration-minimizing structure such as an H-beam frame or a vibration-isolation frame, and an isolation pad. Refer to the specifications in Figure 5.

After installation, apply corrosion-protection to the frame.

Figure 5. Vibration-minimizing structure specifications

Unit Installation

After installing a vibration-isolation frame, loosen the bolts so that the isolat ors are capable of absorbing vibrations (Figure 6).

Figure 6. Bolts on vibration-isolation frame

Securing the Mini Outdoor Unit

The mini outdoor unit must be secured so th at it can withstand a wind speed of 67 mph (30 m/s). Secure the unit firmly to the base with M10 anchor bolts (see Figure 7).

• Use zinc-plated or stainless steel nuts and bolts.

• Use a rubber washer between the bolt and the unit to prevent bimetallic corrosion.

VRF-SVN33A-EN 11

Unit Installation

14.2 (360)

15.1 (384)

24.4 (620)

37.0 (940)

13.0 (330)

Anchor bolt holes (4)

Figure 7. Anchor bolt positions

If you cannot attac h the unit to the base or if the unit needs additional suppor t, secure it with wires as follows:

1. Loosen the four screws at the top of the unit and wrap wire around each of them.

2. Tighten the screws.

3. Stake the wires to the ground (see Figure 8).

Figure 8. Securing the unit with wire

Condenser Air Dischar ge Duct (optional)

12 VRF-SVN33A-EN

CAUTION

Sharp Edges!

Working with galvanized sheet metal involves working with sharp edges. To avoid being cut, technicians MUST put on all necessary Personal Protective Equipment (PPE), including gloves and arm guards.

If you remove the fan guard to install th e di scharge duct, make sure to install a safety net on the duct outlet to prevent foreign substances from entering the unit and to prevent the risk of personal injury from sharp fan blades.

Refrigerant Piping

Main pipe

First branch joint

This section contains information on selecting, storing, and connecting refrigerant piping.

Selecting Refrigerant Piping

Refrigerant piping diameter, thic kness, and temper is selected according to length, as sp ecified in this section.

Notes:

• Use insulated, unw elded, degreased, and deoxidized copper pipe (Cu-DHP type according to ISO 1337 or UNI EN 12735-1) suitable for an operating pressure of at least 609.15 psi (4200 kPa) and a burst pressure of at least 3002.28 psi (20,700 kPa). Copper pipe for hydrosanitary applications is unsuitable.

• If there is a risk of decreased performance caused by pipe length, use piping that is one size larger than that specified in this section.

Pipe Diameter

Table 3 specifies the diameter of the main pipe based on unit capacity.

Table 3. Mini outdoor unit main pipe size based on unit capacity

Refrigerant Piping

Mini outdoor unit

capacity

Ton MBH

338

448

553 3/4 in. (19.05 mm)

(a) Increase the gas pipe from the outdoor unit to the first branch joint by one size if the pipe length between the outdoor

unit and the farthest indoor unit, including the elbow, exceeds 295 ft (90 m); or if the outdoor unit capacity declines due to pipe length.

Liquid pipe

in. (mm)

3/8 in. (9.52 mm)

Gas pipe

in. (mm)

5/8 in. (15.88 mm)

(a)

Table 4 specifies the pipe size between branch joints.

Table 4. Pipe size between branch joints

Pipe size (OD)

Indoor unit total capacity

(MBH)

Less than 51

51-79.2 3/4 (19.05)

Liquid

in. (mm)

3/8 (9.52)

Gas

in. (mm)

5/8 (15.88)

VRF-SVN33A-EN 13

Refrigerant Piping

Branch Joint Selection

Table 5 specifies the first branch joint according to mini outdoor unit capacity.

Table 5. First branch joint according to mini outdoor unit capacity

Mini outdoor unit total capacity

(ton) Branch joint model

5 4YDK2512B0138A

Table 6 specifies branch joints connected after the first branch, according to the total capacity of

all indoor units connected after the first branch.

Table 6. Branch joints connected after the first branch, according to total indoor unit capacity

Total indoor unit capacity

(MBH) Branch joint model

Less than 51 4YDK1509B0051A

51–138.5 4YDK2512B0138A

Pipe Thickness and Temper Grade

Table 7 specifies pipe minimum thickness and temper grade based on pipe diameter.

Risk of Pipes Breaking!

If pipes with a diameter larger than 3/4 in. (19.05 mm) are specified, use semi-hard (C1220T1/2H) or hard (C1220T-H) copper piping. If a soft er copper pipe (C1220T-O) is used, the pipe may break due to its low pressure resistance and cause personal injury.

Table 7. Refrigerant pipe minimum thickness and temper grade

4YDK1509B0051A

CAUTION

Outer diameter

in. (mm)

1/4 (6.35) 0.028 (0.70)

3/8 (9.52) 0.028 (0.70)

1/2 (12.70) 0.031 (0.80)

5/8 (15.88) 0.039 (1.00)

3/4 (19.05) 0.035 (0.9)

7/8 (22.22) 0.035 (0.9)

14 VRF-SVN33A-EN

Minimum thickness

in. (mm)

Temper grade

Annealed

(C1220T-O)

Drawn

(C1220T-1/2H or C1220T-H)

Refrigerant Piping

Outdoor unit

Indoor units

Y-j o int s

EEV kit

Outdoor unit

Indoor units

Y-j oin ts

Refrigerant Piping Maximum Length and Height Differences

Table 8. Maximum refrigerant piping length and height differences for installations with Y-joints and EEV kits

Piping length and

Piping location

Maximum allowable piping length

Maximum allowable height difference

Maximum allowable length after  Y-joint

(a) If the equivalent length between an outdoor unit and the farthest indoor unit exceeds 295 ft (90 m), increase the gas pipe by one size.

Mini outdoor unit to indoor units

(ft [m])

Actual length

Equivalent length

Main pipe length

Total length The sum of the total length of pipes should be less than 984 ft (300 m)

Height

Actual length

height difference

Y-joint connection (refer to Figure 9)

The distance between the mini outdoor unit and the farthest indoor unit ≤ 492 ft (150 m)

Example: 8 indoor units a+b+c+d+e+f+g+p ≤ 492 ft (150 m)

The distance between a mini outdoor unit and the farthest indoor unit ≤ 574 ft (175 m)

The main pipe (a) from the mini outdoor unit to the first Y-joint should be less than 361 ft (110 m)

H1: Height difference between a mini outdoor unit and indoor unit < 164 ft (50 m)

H2: Height difference between indoor units ≤ 49 ft (15 m)

The distance between the first Y-joint and the farthest indoor unit ≤ 131 ft (40 m)

Example: 8 indoor units b+c+d+e+f+g+p ≤ 131 ft (40 m)

(a)

Y-joint and EEV kit

connection

(refer to Figure 10)

Example: 6 indoor units a+b+c+d+j ≤ 492 ft (150 m)

Allowable length between EEV kit and an indoor unit ≤ 65 ft (20 m)

Example: h, l, j ≤ 65 ft (20 m)

Figure 9. Y-joint connection

Figure 10. Y-joint and EEV kit connection

VRF-SVN33A-EN 15

Refrigerant Piping

Distribution header

Mini outdoor unit

Indoor units

Table 9. Maximum refrigerant piping length and height differences for installations with Y-joints and EEV kits

Piping length and

Piping location

Maximum allowable piping length

Maximum allowable height difference

Maximum allowable length after  Y-joint

(a) If the equivalent length between a mini outdoor unit and the farthest indoor unit exceeds 295 ft (90 m), increase the main gas pipe by one size.

Mini outdoor unit to indoor units

(ft [m])

Actual length

Equivalent length

Main pipe length

Total length The sum of the total length of pipes should be less than 984 ft (300 m)

Height

Actual length

height difference

Distribution header connection

(refer to Figure 11)

The distance between the mini outdoor unit and the farthest indoor unit ≤ 492 ft (150 m)

Example: 8 indoor units a+g ≤ 492 ft (150 m)

The distance between a mini outdoor unit and the farthest indoor unit ≤ 574 ft (175 m)

The main pipe (a) from the mini outdoor unit to the first Y-joint should be less than 361 ft (110 m)

H1: Height difference between a mini outdoor unit and indoor unit < 164 ft (50 m)

H2: Height difference between indoor units ≤ 49 ft (15 m)

The distance between the first Y-joint and the farthest indoor unit ≤ 131 ft (40 m)

Example: b+c–f+g ≤ 131 ft (40 m)

(a)

Y-joint and distribution

header connection

(refer to Figure 12)

Example: 8 indoor units a+b+c ≤ 492 ft (150 m)

The distance between the first Yjoint and the farthest indoor unit ≤ 131 ft (40 m) Example: 8 indoor units b+c, d+g ≤ 131 ft (40 m)

Figure 11. Distribution header connection

16 VRF-SVN33A-EN

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