Reznor MASA Owner's manual

0901MASA--EN, page 1
®
Installation/Operation/Maintenance
Applies to: Model MASA
Air Cooled Condensing Unit
Designed for Reznor Split Systems
This booklet includes operation, maintenance, and service information. Before beginning any procedure, carefully
review the information, paying particular attention to the warnings. All installation procedures including handling of
refrigerant must be in compliance with all codes and requirements of authorities having jurisdiction.
Installer should complete information on page 49.
Condenser Startup Form on page 48 should be completed on initial startup.
Owner should keep this booklet for future reference.
R-410A
Refrigerant
Only
IMPORTANT:
Check, Test, and Startup MUST be followed, as documented in this manual.
AcompletedCondenser StartupForm (page41) maybe requiredfor validationof anywarranty
claims.ThefactoryreservestherighttodenywarrantywithoutcompletedCondenserStartupForm.

0901MASA--EN, page 2
Table of Contents
1.0 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
1.1 Hazard Labels and Notices . . . . . . . . . . . . . . .3
1.2 General Information . . . . . . . . . . . . . . . . . . . . .4
1.3 Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
1.4 Installation Codes . . . . . . . . . . . . . . . . . . . . . . .4
2.0 Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
3.0 Receiving, Moving, and Uncrating . . . . . . . . . .5
3.1 Receiving . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
3.2 Moving. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
3.3 Uncrating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
4.0 Clearances and Dimensions . . . . . . . . . . . . . . .5
4.1 Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
4.2 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
5.0 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
5.1 Weights. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
5.2 Lifting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
5.3 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
6.0 Mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
6.1 Refrigerant Piping . . . . . . . . . . . . . . . . . . . . . . .7
6.1.1 Location of Piping Connections at
the Condensing Unit . . . . . . . . . . . . . . . . .7
6.1.2 Location of Piping Connections at
the Split System Evaporator Coil. . . . . . . .8
6.1.3 Refrigerant Piping Guidelines
(R-410A Refrigerant) . . . . . . . . . . . . . . . 11
6.1.3.1 Type of Refrigerant Piping . . . . . . . . 11
6.1.3.2 Refrigerant Piping Length
and Size. . . . . . . . . . . . . . . . . . . . . . . . . 11
6.1.3.3 Liquid Line Piping . . . . . . . . . . . . . . .13
6.1.3.4 Suction Line Piping . . . . . . . . . . . . . .15
6.1.3.5 Brazing Connections . . . . . . . . . . . . .16
6.1.3.6 Piping Support and Insulation . . . . . .16
6.2 Leak Test the Refrigerant Circuits. . . . . . . . . .17
6.2.1 Leak Test the Condensing Unit . . . . . . . . 17
6.2.2 Leak Test the Field-Installed Piping . . . . .17
6.3 Evacuate the Circuits . . . . . . . . . . . . . . . . . . .17
6.4 R-410A Refrigerant Charge . . . . . . . . . . . . . .18
7.0 Electrical and Wiring . . . . . . . . . . . . . . . . . . . .19
7.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
7.2 Supply Wiring . . . . . . . . . . . . . . . . . . . . . . . . .19
8.0 Controls and Operation . . . . . . . . . . . . . . . . . .24
8.1 Analog Control System . . . . . . . . . . . . . . . . . .24
8.2 Digital Control System . . . . . . . . . . . . . . . . . .24
8.3 Other Compressor and Refrigerant
Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
8.3.1 High Pressure Cutoff . . . . . . . . . . . . . . . .24
8.3.2 Low Pressure Cutoff. . . . . . . . . . . . . . . . .24
8.3.3 Compressor Protection 24
8.3.4 Crankcase Heaters. . . . . . . . . . . . . . . . . .24
9.0 Final Checks and Start-Up. . . . . . . . . . . . . . . .25
9.1 General Comments . . . . . . . . . . . . . . . . . . . . .25
9.1.1 Checklist Prior to Start-up. . . . . . . . . . . . .25
9.2 Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
9.2.1 Power Supply Voltage Phasing . . . . . . . .26
9.2.2 Operating Sequence. . . . . . . . . . . . . . . . .27
9.2.3 Refrigerant Charge. . . . . . . . . . . . . . . . . .27
9.2.3.1 Check SUBCOOLING . . . . . . . . . . . . 27
9.2.3.2 Determine SUPERHEAT . . . . . . . . . . 28
9.3 After Startup: . . . . . . . . . . . . . . . . . . . . . . . . . .28
10.0 Maintenance and Service. . . . . . . . . . . . . . . .29
10.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
10.2 Maintenance Schedule . . . . . . . . . . . . . . . . .29
10.3 Condenser Fan(s) Maintenance . . . . . . . . . .30
10.4 Condenser Coil Maintenance . . . . . . . . . . . .30
10.5 Compressor Maintenance and
Replacement. . . . . . . . . . . . . . . . . . . . . . . . .31
10.6 Troubleshooting Chart. . . . . . . . . . . . . . . . . .37
10.7 Spare parts . . . . . . . . . . . . . . . . . . . . . . . . .39
Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
IMPORTANT Reminders about R-410A
Refrigerant and POE Oil . . . . . . . . . . . . . . . . . .40
Model MASATechnical Information. . . . . . . . . . . .41
Performance tables. . . . . . . . . . . . . . . . . . . . . . . .42
Pressure/Temperature Chart for R-410A Refrigerant
for Checking Subcooling
and Superheat . . . . . . . . . . . . . . . . . . . . . . .48
Condenser startup form. . . . . . . . . . . . . . . . . . . . .49
INSTALLER MUST COMPLETE INFORMATION
FORM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

0901MASA--EN, page 3
1.0 GENERAL
1.1 Hazard Labels
and Notices
Definitions of
Hazard Intensity
Levels in this
Manual
HAZARD INTENSITY LEVELS
DANGER: Failure to comply will result in severe personal injury or death
and/or property damage.
WARNING: Failure to comply could result in severe personal injury or death
and/or property damage.
CAUTION: Failure to comply could result in minor personal injury and/or
property damage.
There are warning labels on the condensing unit and throughout this manual.
For your safety, read the definitions below and comply with all boxes labeled
CAUTION, WARNING, and DANGER during installation, operation, mainte-
nance, and service of this system.
WARNING
Improper installation, adjustment, alteration, service, or maintenance can
cause property damage, personal injury, or death. A qualified installer or
service agency must perform installation and service.
DANGER
This condensing unit is designed to use R-410A high pressure refrigerant
only. Hazards exist that could result in personal injury or death. Installation,
maintenance, and service should only be performed by an HVAC technician
qualified in R-410A refrigerant and using proper tools and equipment.
Due to much higher pressure of R-410A refrigerant, DO NOT USE service
equipment or tools designed for R22 or R-407C refrigerant.
DANGER
Never use oxygen to pressurize a refrigeration system. Oxygen can explode
on contact with oil and result in personal injury or death. When using high
pressure gas such as nitrogen for pressurizing a refrigeration system,
ALWAYS USE A PRESSURE REGULATOR that can control the pressure
down to 0,1 bar.
SAFETY WARNINGS
For your safety, wear eye protection, gloves, and protective clothing when
handling R-410A refrigerant or POE oil and when brazing. Have a fire
extinguisher nearby when brazing.
WARNING
Before installing or servicing, always turn off the main power to the system
and install a lock out on the disconnect switch.
CAUTION
Do not leave system open to the atmosphere any longer than minimum
required for installation. Exposure for more than five minutes may
contaminate the system. POE oil in the compressors is extremely susceptible
to moisture absorption. Always keep ends of tubing sealed during installation.

0901MASA--EN, page 4
This booklet includes operation, maintenance, and service information. Before
beginning any procedure, carefully review the information, paying particular
attention to the warnings. All installations must be in compliance with all codes
and requirements of authorities having jurisdiction.
A Model MASA outdoor condensing unit operates on R-410A refrigerant and
has two independent refrigeration circuits configured in an approximate 1/3-
2/3 arrangement. The Model MASAcondensing unit is designed for use with a
Reznor PREEVAair handler unit with a 1/3-2/3 two-circuit cooling coil. PREEVA
indoor Model is SDH; outdoor Model is RDH.
The Model MASA condensing unit may also be matched to a field-supplied
1/3-2/3 two-circuit evaporator coil. An air handler used with a Model MASA
condensing unit must be properly matched; the evaporator coil must have
freeze protection and must be equipped with properly sized thermal expansion
valves.
CAUTION
The condensing unit must be matched to an approximate 1/3-2/3
two-circuit, R-410A refrigerant coil with properly sized thermal
expansion valves. Failure to properly match and/or equip the
split system components will prevent the system from operating
correctly and will void the manufacturer’s warranty. See Hazard
Levels, page 3.
These units must be in accordance with EN 378-4 as appropriate plus all local
building codes.
1.2 General
Information
1.3 Installation
Codes
Model MASA condensing unit must be mounted outdoors on a level surface.
The supporting structure must be able to support the operating weight of the
unit and maintain a level plane during continued operation. Water should drain
away from the unit. Location must comply with free space clearances for unre-
stricted airflow (See Paragraph 4.1) and the refrigerant piping requirements
(See Paragraph 6.1.3). Avoid facing condenser coils into the prevailing wind.
2.0 LOCATION

0901MASA--EN, page 5
3.0 RECEIVING
MOVING/UNCRATING
3.1 Receiving The unit was test operated and inspected at the factory prior to crating and
was in proper operating condition.
If the heater has incurred damage in shipment, document the damage with
the transport company and contact your supplier.
3.2 Moving The heavy gauge base of the condensing unit has forklift openings in both
sides. To move a unit, use a forklift with forks that have a minimum length of
610mm.
3.3 Uncrating Immediately upon uncrating, check the rating plate to verify that the unit is
suitable for the installation site. This condensing unit is designed for R-410A
refrigerant only; verify that the split system air handler is for use with R-410A
refrigerant.
Shipped-Separate
Items Before beginning installation, be sure that all shipped-separate options
ordered are available at the site. Shipped-separate options could have been
ordered with the condensing unit or the matching PREEVA air handler.
NOTE: Two liquid line filter driers are shipped loose with the condensing unit
for field installation
4.0 CLEARANCES &
DIMENSIONS
4.1 Clearances Thecondensing unitmust have unrestricted airflow on the coilside andabove
the unit. A service clearance is required on the control side of the cabinet.
Figure 1 - minimum
clearances (top view)
Coil Side
(Inlet airflow through
the condenser coil
must be unrestricted.)
Control Side
(Service
Clearance)
Opposite
Control
Side
Airflow
Top discharge airflow must be unrestricted.
Top clearance is 1524mm.
914mm
152mm
152mm
Top
View
1219mm