tr>
YCUL AIR COOLED CONDENSING - DX COIL SPLIT SYSTEM APPLICATIONS & PIPING GUIDELINES ENGINEERING SUPPLEMENT
YCUL AIR COOLED
CONDENSING - DX COIL SPLIT SYSTEM
APPLICATIONS & PIPING GUIDELINES
Supersedes: Nothing
Form 050.40-ES3 (204)
GUIDELINES FOR PROPER APPLICATION PIPING AND
GUIDELINES FOR SPLIT SYSTEMS
LD09032 YORK INTERNATIONAL
2
FORM 050.40-ES3 (204)
IMPORTANT!
READ BEFORE PROCEEDING!
GENERAL SAFETY GUIDELINES
This equipment is a relatively complicated apparatus. During installation, operation maintenance or ser vice, in di vid u als
may be exposed to certain components or conditions including, but not limited to: re frig er ants, oils, materials under
pressure, rotating components, and both high and low voltage. Each of these items has the potential, if misused or
handled improperly, to cause bodily injury or death. It is the ob li ga tion and responsibility of operating/service personnel
to identify and recognize these inherent hazards, protect themselves, and proceed safely in com plet ing their tasks.
Failure to comply with any of these requirements could result in serious dam age to the equipment and the property
in which it is situated, as well as severe personal injury or death to themselves and people at the site.
This document is intended for use by owner-authorized operating/service personnel. It is ex pect ed that this individual
posseses independent training that will enable them to perform their assigned tasks prop er ly and safely. It is essential
that, prior to performing any task on this equip ment, this individual shall have read and understood this document and
any referenced ma te ri als. This individual shall also be familiar with and comply with all applicable governmental
standards and regulations pertaining to the task in question.
SAFETY SYMBOLS
The following symbol is used in this document to alert the reader to areas of potential hazard:
NOTE is used to highlight additional information which may be helpful to you.
CAUTION identi es a hazard which could lead to damage to the machine, damage to other
equipment and/or environmental pollution. Usually an instruction will be given, together with a
brief ex pla na tion.
CHANGEABILITY OF THIS DOCUMENT
In complying with YORKs policy for continuous product improvement, the information contained in this document
is subject to change without notice. While YORK makes no commitment to update or provide current information
automatically to the manual owner, that information, if applicable, can be obtained by contacting the nearest YORK
Applied Systems Service of ce.
It is the responsibility of operating/service personnel to verify the applicability of these documents to the equipment in
question. If there is any question in the mind of operating/service personnel as to the ap pli ca bil i ty of these documents,
then prior to working on the equipment, they should verify with the owner whether the equipment has been modi ed
and if current literature is available. FORM 050.40-ES3 (204)
3
YORK INTERNATIONAL
TABLE OF CONTENTS
INTRODUCTION..................................................................................................................9
SECTION 1 - EQUIPMENT LOCATION ............................................................................10

GENERAL EQUIPMENT INSTALLATION AND LOCATION....................................................... 10

WHERE SHOULD THE COMPONENTS BE LOCATED............................................................ 10
LOCATION AND CLEARANCES................................................................................................ 10
FOUNDATION ............................................................................................................................ 11

GROUND LEVEL LOCATIONS .................................................................................................. 11
ROOFTOP
LOCATIONS............................................................................................................. 11

NOISE SENSITIVE LOCATIONS ............................................................................................... 11

CONDENSER COIL PROTECTION .......................................................................................... 11
SECTION 2 - EQUIPMENT SELECTION ..........................................................................12
SYSTEM
COMPONENTS .......................................................................................................... 12
COMPRESSOR.......................................................................................................................... 12
CONDENSER............................................................................................................................. 12
EVAPORATOR ........................................................................................................................... 13
EXPANSION
DEVICE................................................................................................................. 13

APPLICATION DESIGN CONDITIONS ...................................................................................... 14

YCUL Condensing Unit Performance Information .................................................................. 14

DX Coil Performance Information........................................................................................... 15

BALANCE POINT CROSS PLOT ILLUSTRATION .................................................................... 15

YCUL Capacity Ratings .......................................................................................................... 15

Solution DX Coil Capacity Ratings ......................................................................................... 17

YCUL & DX Coil Balance Point Without Suction Line Penalty ............................................. 19

YCUL & DX Coil Adjusted Balance Point After Suction Line Penalty ..................................... 20

Summary ................................................................................................................................ 21

SYSTEM COMPARISON CONSIDERATION............................................................................. 22
SECTION 3 - COIL SELECTION/CONFIGURATION ........................................................24
DX
COIL
TYPES......................................................................................................................... 24

DX COIL CIRCUITING ............................................................................................................... 24

DX COIL CIRCUITING AND STAGING ...................................................................................... 26

HOT GAS BYPASS .................................................................................................................... 28

DX COIL DISTRIBUTOR NOZZLES........................................................................................... 28

MAINTAINING ADEQUATE AIRFLOW ..................................................................................... 28
VAV
SYSTEMS........................................................................................................................... 29

BUILDING AUTOMATION SYSTEM INTERFACE ..................................................................... 29 YORK INTERNATIONAL
4
FORM 050.40-ES3 (204)
TABLE OF CONTENTS (CONT'D)
SECTION 4 - PIPING ........................................................................................................30

DX LINE SIZING RECOMMENDATIONS................................................................................... 30

ACTUAL PIPING ROUTING VERSUS ORIGINAL PIPING DESIGN ......................................... 30
SUCTION
LINES ........................................................................................................................ 30
LIQUID
LINES ............................................................................................................................ 31

BASIC TIPS FOR SUCCESSFUL DESIGNS ............................................................................. 32

Liquid Line Piping, Liquid Line Solenoid Valve, and TXVs..................................................... 32

DX Coils.................................................................................................................................. 32

Suction Line Piping................................................................................................................. 32

Hot Gas Bypass...................................................................................................................... 32

Controls .................................................................................................................................. 32

EXAMPLES OF YCUL-DX COIL PIPING ARRANGEMENTS.................................................... 33

HOT GAS BYPASS LINES ......................................................................................................... 41
PIPING
EXAMPLE...................................................................................................................... 41

SELECTING SUCTION LINES................................................................................................... 42

Suction Line Full Load Duty Initial Selection ........................................................................ 43

Suction Line Condensing Temperature Correction ..........................................................