AAON SB-018 User Manual

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vicinity of this or any other appliance.

WARNING

Improper installation, adjustment, alteration, service or maintenance can cause property damage,

y or loss of life.

Installation and service must be

WARNING

SB Series

Vertical Self Contained Units

Installation, Operation

& Maintenance

personal injur

performed by a trained, qualified installer. A copy of this IOM should be kept with the unit.

QUALIFIED INSTALLER

If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or loss of life.

FOR YOUR SAFETY

Do not store or use gasoline or other flammable vapors and liquids in the

Table of Contents

Safety .............................................................................................................................................. 5

SB Base Model Description .......................................................................................................... 10

General Information ...................................................................................................................... 15

Codes and Ordinances............................................................................................................... 15

Receiving Unit .......................................................................................................................... 16

Storage ...................................................................................................................................... 16

Direct Expansion (DX) Systems ............................................................................................... 16

Wiring Diagrams ....................................................................................................................... 17

Condensate Drain Pans ............................................................................................................. 17

Installation..................................................................................................................................... 18

Locating the Unit ...................................................................................................................... 18

Floor Mounted Units ............................................................................................................. 18

Lifting and Handling the Unit ................................................................................................... 19

Refrigerant-to-Water Heat Exchanger Water Piping ................................................................ 19

Open Loop Applications ....................................................................................................... 19

Freezing Water in the Heat Exchanger ................................................................................. 20

Water Piping ......................................................................................................................... 21

Electrical ................................................................................................................................... 23

Cutting Electrical Openings .................................................................................................. 23

Thermostat Control Wiring ................................................................................................... 25

Duct Connection ....................................................................................................................... 25

Condensate Drain Piping .......................................................................................................... 26

Waterside Economizer .............................................................................................................. 26

Heating Coils ............................................................................................................................ 27

Startup ........................................................................................................................................... 27

Supply Fans ............................................................................................................................... 28

Supply Fan Airflow Adjustment ........................................................................................... 28

Filters ........................................................................................................................................ 31

Adjusting Refrigerant Charge ................................................................................................... 31

Operation....................................................................................................................................... 34

Packaged DX Cooling Operation and Control .......................................................................... 34

Electric Heating Operation ....................................................................................................... 34

Steam or Hot Water Preheating Operation ............................................................................... 34

Maintenance .................................................................................................................................. 34

DX Cooling ............................................................................................................................... 34

Condensate Drain Pans ............................................................................................................. 34

E-Coated Coil Cleaning ............................................................................................................ 35

Recommended Coil Cleaner ................................................................................................. 35

Recommended Chloride Remover ........................................................................................ 36

Supply Fans ............................................................................................................................... 36

Filter Replacement .................................................................................................................... 37

Replacement Parts ..................................................................................................................... 37

AAON Longview Product Support ........................................................................................... 37

Filter Information .......................................................................................................................... 37

Appendix A - Heat Exchanger Corrosion Resistance ................................................................... 39

Index of Tables and Figures

Tables:

Table 1 - SB Series Clearances ..................................................................................................... 18

Table 2 - Glycol Freezing Points .................................................................................................. 21

Table 3 - Condenser Water Connections ...................................................................................... 22

Table 4 - Control Wiring ............................................................................................................... 25

Table 5 - Drain Trap Dimensions ................................................................................................. 26

Table 6 - Acceptable Water-Cooled Refrigeration Circuit Values ............................................... 32

Table 7 - R-410A Refrigerant Temperature-Pressure Chart ......................................................... 33

Table 8 - 3-5 ton (B Cabinet) Pre and Unit Filters ....................................................................... 37

Table 9 - 6-10 ton (C Cabinet) Pre and Unit Filters ..................................................................... 37

Table 10 - 14-18 ton (D Cabinet) Pre and Unit Filters ................................................................. 38

Table 11- 3-5 ton (B Cabinet) Mixing Box Filters ....................................................................... 38

Table 12 - 6-10 ton (C Cabinet) Mixing Box Filters .................................................................... 38

Table 13 - 14-18 ton (D Cabinet) Mixing Box Filters .................................................................. 38

Figures:

Figure 1 - Lockable Handle .......................................................................................................... 16

Figure 2 - SB Series ...................................................................................................................... 18

Figure 3 - SB Series Unit Orientation ........................................................................................... 19

Figure 4 - Drain Trap .................................................................................................................... 26

Figure 5 - SB Series Supply Fan ................................................................................................... 28

Figure 6 - ECM with Factory Provided Controls.......................................................................... 29

Figure 7 - ECM with Potentiometer Control ................................................................................ 29

Figure 8 - ECM with Field Installed Controls .............................................................................. 30

V14190 · Rev. A · 121227

(ACP 31227)

Attention should be paid to the following statements:

ELECTRIC SHOCK, FIRE OR

Failure to follow safety warnings exactly could result in dangerous operation, serious injury, death or

Improper servicing could result in

Before servicing, disconnect all

than one disconnect may be

wires prior to disconnecting.

Verify proper operation after

Electric shock hazard. Before servicing, disconnect all electrical

FIRE, EXPLOSION OR CARBON

Failure to replace proper controls could result in fire, explosion or

to follow safety warnings exactly

and liquids in the vicinity of this

Safety

NOTE - Notes are intended to clarify the unit installation, operation and maintenance.

CAUTION - Caution statements are given to prevent actions that may result in

equipment damage, property damage, or personal injury.

WARNING - Warning statements are given to prevent actions that could result in

equipment damage, property damage, personal injury or death.

DANGER - Danger statements are given to prevent actions that will result in equipment

damage, property damage, severe personal injury or death.

EXPLOSION HAZARD

property damage.

dangerous operation, serious injury, death or property damage.



electrical power to the unit. More

provided.

 When servicing controls, label all

Reconnect wires correctly.



servicing. Secure all doors with key-lock or nut and bolt.

power to the unit, including remote disconnects, to avoid shock hazard or injury from rotating parts. Follow proper Lockout-Tagout procedures.

MONOXIDE POISONING HAZARD

carbon monoxide poisoning. Failure

could result in serious injury, death or property damage. Do not store or use gasoline or other flammable vapors

appliance.

All field installed wiring must be completed by qualified personnel. Field installed wiring must comply with NEC/CEC, local and state

to follow code requirements could result in serious injury or death. Provide proper unit ground in accordance with these code

WARNING

electrical components. Only a qualified licensed electrician or

electrical components shall

70E, an OSHA

regulation requiring an Arc Flash

marked for identification of where appropriate Personal Protective

To prevent injury or death lifting

power to the unit has been disconnected and fan wheel has

During installation, testing, servicing and troubleshooting of the equipment it may be necessary to work with live

individual properly trained in handling live perform these tasks.

Standard NFPA-

Boundary to be field established and

Equipment (PPE) be worn, should be followed.

GROUNDING REQUIRED

electrical code requirements. Failure

requirements.

UNIT HANDLING

equipment capacity shall exceed unit weight by an adequate safety factor. Always test-lift unit not more than 24 inches high to verify proper center of gravity lift point to avoid unit damage, injury or death.

ROTATING COMPONENTS

Unit contains fans with moving parts that can cause serious injury. Do not open door containing fans until the

stopped rotating.

Failure to properly drain and vent coils when not in use during freezing temperature may result in coil and equipment damage.

Prior to connection of condensing

or death due to instantaneous

not use alkaline chemical coil

WARNING

CAUTION

in place of refrigerant and dry

Always use a pressure regulator,

ges to control

A sufficient quantity of

on all

should be checked for proper

Rotation must be checked MOTORS AND COMPRESSORS of 3 phase units at startup by a qualified service technician. Scroll compressors are directional and can be damaged if rotated in the wrong direction. Compressor rotation must be checked using suction and discharge gauges. Fan motor rotation

operation. Alterations should only be made at the unit power connection

WATER PRESSURE

water supply, verify water pressure is less than maximum pressure shown on unit nameplate. To prevent injury

release of high pressure water, relief valves should be field supplied on system water piping.

Do not use oxygen, acetylene or air

nitrogen for leak testing. A violent explosion may result causing injury or death.

valves and gau incoming pressures when pressure testing a system. Excessive pressure may cause line ruptures, equipment damage or an explosion which may result in injury or death.

Do not work in a closed area where refrigerant or nitrogen gases may be leaking. vapors may be present and cause injury or death.

Do not clean DX refrigerant coils with hot water or steam. The use of hot water or steam on refrigerant coils will cause high pressure inside the coil tubing and damage to the coil.

To prevent damage to the unit, do not use acidic chemical coil cleaners. Do

cleaners with a pH value greater than

8.5, after mixing, without first using an aluminum corrosion inhibitor in the cleaning solution.

Some chemical coil cleaning

Failure to follow

Door compartments containing

h door latches to

cooling tower or the

condenser water loop with harsh

(muriatic acid) or chlorine, can

Care should be taken to avoid allowing chemicals to enter the

cooled condenser. See

Heat Exchanger

Corrosion Resistance for more

of chemical corrosion is excluded

Failure of the condenser due to

refrigerant circuit and will cause

from coverage under AAON

manufacturer warranties.

vulnerable to attack by certain chemicals. Polyolester (POE) oils

410A and other

and complete piping

system failure.

compounds are caustic or toxic. Use these substances only in accordance with the manufacturer’s usage instructions. instructions may result in equipment damage, injury or death.

hazardous voltage or rotating parts are equipped wit allow locks. Door latch are shipped with nut and bolts requiring tooled access. If you do not replace the shipping hardware with a pad lock always re-install the nut & bolt after closing the door.

Cleaning the

chemicals, such as hydrochloric acid

damage the water-cooled condenser.

waterAppendix A -

information.

OPEN LOOP APPLICATIONS

Failure of the condenser as a result

from coverage under AAON Inc. warranties and the heat exchanger manufacturer’s warranties.

WATER FREEZING

freezing will allow water to enter the

extensive damage to the refrigerant circuit components. Any damage to the equipment as a result of water freezing in the condenser is excluded

warranties and the heat exchanger

PVC (Polyvinyl Chloride) and CPVC (Chlorinated Polyvinyl Chloride) are

used with Rrefrigerants, even in trace amounts, in a PVC or CPVC piping system will result in stress cracking of the piping and fittings

To prevent motor overheating compressors must cycle off for a

To maintain the proper oil level compressors must cycle on for a

starts per hour.

WARNING

COMPRESSOR CYCLING

5 MINUTE MINIMUM OFF TIME

minimum of 5 minutes.

5 MINUTE MINIMUM ON TIME

minimum of 5 minutes.

The cycle rate must not exceed 6

1. The unit is for indoor use only. See

General Information section for more unit information.

2. Every unit has a unique equipment

nameplate with electrical, operational, and unit clearance specifications. Always refer to the unit nameplate for specific ratings unique to the model you have purchased.

3. READ THE ENTIRE INSTALLATION,

OPERATION AND MAINTENANCE MANUAL. OTHER IMPORTANT SAFETY PRECAUTIONS ARE PROVIDED THROUGHOUT THIS MANUAL.

4. Keep this manual and all literature

safeguarded near or on the unit.

Series and

Generation

Unit Size

Configuration/Interior

Protection

Model Number

SB Base Model Description

BASE MODEL

SERIES AND GENERATION

UNIT SIZE

003 = 3 ton Capacity 004 = 4 ton Capacity 005 = 5 ton Capacity 006 = 6 ton Capacity 007 = 7 ton Capacity 009 = 9 ton Capacity 010 =10 ton Capacity 014 =14 ton Capacity 016 = 16 ton Capacity 018 = 18 ton Capacity

VOLTAGE

1 = 230V/1Φ/60Hz 2 = 230V/3Φ/60Hz 3 = 460V/3Φ/60Hz 4 = 575V/3Φ/60Hz 8 = 208V/3Φ/60Hz 9 = 208V/1Φ/60Hz

CONFIGURATION

0 = Right Hand Unit + Top Vertical Discharge A = Left Hand Unit + Top Vertical Discharge

007 3

Voltage

E 7 0 9

A1 A2 A3 A4

Model Option A: COOLING/HEAT PUMP

A1: REFRIGERANT STYLE

E = R-410A Variable Capacity Scroll Compressor

A2: UNIT CONFIGURATION

0 = Water-Cooled Condenser - Condensing Unit Only 7 = Water-Source/Geothermal Heat Pump + Std Evap. Coil - Coaxial Heat Exchanger 8 = Water-Source/Geothermal Heat Pump + 6 Row Evap. Coil - Coaxial Heat Exchanger 9 = Water-Source/Geothermal Heat Pump Condensing Unit Only

A3: COIL COATING

0 = Standard 1 = Polymer E-Coated Cooling Coil D = Stainless Steel Cooling Coil Casing

A4: COOLING/HEAT PUMP STAGING

9 = Modulating - Variable Capacity Compressor

Model/Feature Number

SB Base Model and Features Description

0 0 0

B1 B2 B3 1A 1B 1C 1D 2 3 4

Model Option B: HEATING

B1: HEATING TYPE

0 = No Heating 3 = Electric Heat C = Steam Distributing Standard Coil D = Steam Distributing Polymer E-Coated Coil E = Hot Water Standard Coil F = Hot Water Polymer E-Coated Coil

B2: HEATING DESIGNATION

0 = No Heating 1 = 1 Row Coil 2 = 2 Row Coil A = 7 kW (5.3 kW @ 208V) B = 14 kW (10.5 kW @ 208V) C = 21 kW (15.8 kW @ 208V) D = 28 kW (21.0 kW @ 208V) E = 35 kW (26.3 kW @ 208V) F = 42 kW (31.5 kW @ 208V) G = 49 kW (37.0 kW @ 208V) H = 56 kW (42.0 kW @ 208V) J = 63 kW (47.3 kW @ 208V) K = 70 kW (52.5 kW @ 208V)

B3: HEATING STAGING

0 = No Heating 1 = 1 Stage 2 = 2 Stage 3 = 3 Stage 4 = 4 Stage 9 = Modulating/SCR Electric - Potentiometer Control A = Modulating/SCR Electric - 0-10VDC Control Signal H = Single Serpentine 8 fpi J = Half Serpentine 8 fpi K = Single Serpentine 10 fpi L = Half Serpentine 10 fpi M = Single Serpentine 12 fpi N = Half Serpentine 12 fpi

0 0 0 0

Feature 1: RETURN/OUTSIDE AIR

1A: RETURN/OUTSIDE AIR SECTION

0 = Standard 1 = Mixing Box - Front and Front Openings 2 = Mixing Box - Top and Front Openings 3 = Mixing Box - Front and Right Openings 4 = Mixing Box - Front and Left Openings 5 = Mixing Box - Top and Right Openings 6 = Mixing Box - Top and Left Openings

1B: BLANK

0 = Standard

1C: FILTER LOCATION

0 = Standard A = Mixing Box Filters

1D: MIXING BOX DAMPER CONTROL

0 = Standard - None A = 2 Position Actuators (24V) B = Fully Modulating Actuators (DDC) C = Fixed Position Dampers

Feature 2: WATERSIDE ECONOMIZER

0 = Standard - None A = Waterside Economizer - 4 Row Single Serpentine 12 FPI Coil B = Waterside Economizer - 6 Row Single Serpentine 12 FPI Coil

Feature 3: BLANK

0 = Standard

Feature 4: MAINTENANCE OPTIONS

0 = Standard A = Blower Aux. Contact - Low Voltage Terminal Block B = Remote Start/Stop Terminals - Low Voltage Terminal Block C = Options A + B

0 0 0

Feature Number

SB Features Description

A B C

5A 5B 5C 6A 6B 6C 7 8 9 10 11 12

Feature 5: SUPPLY AIR OPTIONS

5A: SUPPLY AIR BLOWER CONFIGURATION

0 = No Airside - Condensing Unit Only A = 1 Blower + High Efficiency EC Motor B = 2 Blowers + High Efficiency EC Motors

5B: SUPPLY AIR BLOWER

0 = No Airside - Condensing Unit Only A = 310 mm (14”) Direct Drive Backward Curved Plenum Fan B = 355 mm (16”) Direct Drive Backward Curved Plenum Fan C = 450 mm (18”) Direct Drive Backward Curved Plenum Fan

5C: SUPPLY AIR BLOWER MOTOR

0 = No Airside - Condensing Unit Only C = 1.7 kW (2.3 hp) D = 3.0 kW (4.0 hp) E = 6.0 kW (8.0 hp)

Feature 6: FILTERS

6A: PRE FILTER TYPE

0 = No Pre Filter A = 2” Pleated - 30% Eff. - MERV 8

6B: UNIT FILTER TYPE

0 = No Unit Filter A = 2” Pleated - 30% Eff. - MERV 8 B = 4” Pleated - 30% Eff. - MERV 8 C = 4” Pleated - 65% Eff. - MERV 11 D = 4” Pleated - 85% Eff. - MERV 13 E = 4” Pleated - 95% Eff. - MERV 14 F = 4” Carbon G = Options C + F H = Options D + F J = Options E + F K = Options C + D L = Options C + E

6C: FILTER OPTIONS

0 = Standard A = Clogged Filter Switch B = Magnehelic Gauge C = Options A + B

0 A 0

0 0 0 0 0 0

Feature 7: REFRIGERATION CONTROL

0 = Standard C = Freeze Stat - Each Circuit

Feature 8: REFRIGERATION OPTIONS

0 = Standard D = Modulating Hot Gas Reheat

Feature 9: REFRIGERATION ACCESSORIES

0 = Standard A = Sight Glass B = Compressor Isolation Valves C = Options A + B

Feature 10: POWER OPTIONS

0 = Standard Power Block

Feature 11: SAFETY OPTIONS

0 = Standard C = Supply Air Smoke Detector H = Remote Safety Shutoff Terminals L = Options A + H

Feature 12: CONTROLS

0 = Standard A = Low Limit Controls B = Phase and Brown Out Protection C = Options A + B

Feature Number

SB Features Description

13 14A 14B 15

Feature 13: SPECIAL CONTROLS

D = VAV Unit Controller - VAV Cool + CV Heat Y = VAV Single Zone Heat Pump Unit Controller VAV Cool + VAV Heat Z = Constant Volume Heat Pump Unit Controller CV Cool + CV Heat 1 = Make Up Air Heat Pump Unit Controller - CV Cool + CV Heat 4 = Field Installed DDC Controls by Others 5 = Field Installed DDC Controls by Others with Isolation Relays 6 = Factory Installed DDC Controls Furnished by Others with Isolation Relays

Feature 14: WATER-COOLED CONDENSER AND WATERSIDE ECONOMIZER

14A: WATER-COOLED CONDENSER

0 = Standard - None B = Water Flow Switch E = Balancing Valves + Option B H = Motorized Shut-Off Valve + Option B J = Head Pressure Control + Option B L = Balancing Valves + Motorized Shut-Off Valve + Option B M = Balancing Valves + Head Pressure Control + Option B T = CuNi Corrosion Resistant Coaxial Heat Exchanger + Option B W = CuNi Corrosion Resistant Coaxial Heat Exchanger + Balancing Valves + Option B 1 = CuNi Corrosion Resistant Coaxial Heat Exchanger + Motorized Shut-Off Valve + Option B 2 = CuNi Corrosion Resistant Coaxial Heat Exchanger + Head Pressure Control + Option B 4 = CuNi Corrosion Resistant Coaxial Heat Exchanger + Balancing Valves + Motorized Shut-Off Valve + Option B 5 = CuNi Corrosion Resistant Coaxial Heat Exchanger + Balancing Valves + Head Pressure Control + Option B

E 0

14B: WATERSIDE ECONOMIZER PIPING

0 = Standard - None A = Variable Water Flow Application Field Piped Waterside Economizer B = Constant Water Flow Application Field Piped Waterside Economizer C = Variable Water Flow Application Factory Piped Waterside Economizer D = Constant Water Flow Application Factory Piped Waterside Economizer

Feature 15: GLYCOL PERCENTAGE

0 = Standard - None A = Minimum 20% Propylene Glycol B = Minimum 40% Propylene Glycol

Feature Number

SB Features Description

0 0 0 0 0 0 A B

16 17 18 19 20 21 22 23

Feature 16: INTERIOR CABINET OPTIONS

0 = Standard - Double Wall Construction + R-6.5 Foam Insulation + Stainless Steel Drain Pan A = Overflow Switch B = Compressor Sound Blanket C = Options A + B

Feature 17: EXTERIOR CABINET OPTIONS

0 = Standard A = AAON Gray Exterior Paint B = Special Paint C = Interior Corrosion Protection D = Options A + C

Feature 18: WARRANTY

0 = Standard A = Second to Fifth Year Extended Compressor Warranty

Feature 19: CODE OPTIONS

0 = Standard - ETL U.S.A. Listing

Feature 20: CRATING

0 = Standard A = Export Crating B = Forkliftable Base - 5” Base D = Options A + B E = Shipping Shrink Wrap F = Options B + E G = Options A + B + E

Feature 21: UNIT SPLITS

0 = Standard - One Piece Unit A = Two Piece Unit - One Compressorized Section + One Air Tunnel Section

Feature 22: CONTROL VENDORS

0 = Standard A = WattMaster Orion Controls System E = Remote Mounted AAON Mini Controller

Feature 23: TYPE

B = Standard X = Special Pricing Authorization

Improper installation, adjustment,

service or maintenance can cause property damage, personal injury or loss of life. Installation and service must be

recovery, recycling, or reclaiming must be followed.

Coils and sheet metal surfaces

working with

WARNING

“construction heater” at anytime during any phase of construction. Very low return air temperatures,

CAUTION

General Information

SB Series self contained units have been designed for indoor installation only. Units are assembled, wired, charged and runtested at the factory.

alteration,

performed by a qualified installer. A copy of this IOM should be kept with the unit.

These units must not be used as a

harmful vapors, and misplacement of the filters will damage the unit and its efficiency.

Certification of Steam or Hot Water Heat Models

a. Certified as a forced air heating system

with cooling.

b. Certified for indoor installation only.

Certification of Electric Heat Models

a. Certified as an electric warm air furnace

with cooling.

b. Certified for indoor installation only.

Certification of Cooling Models

a. Certified as a commercial central air

conditioner with electrically operated compressors.

b. Certified for indoor installation only. c. Certified with refrigerant R-410A coils.

Codes and Ordinances

SB Series units have been tested and certified, by ETL, in accordance with UL Safety Standard 1995/CSA C22.2 No. 236.

System should be sized in accordance with the American Society of Heating, Refrigeration and Air Conditioning Engineers Handbook.

Installation of units must conform to the ICC standards of the International Mechanical Code, the International Building Code, Installation of Air Conditioning and Ventilating Systems Standard, NFPA 90A, and local building, plumbing and waste water codes. All appliances must be electrically grounded in accordance with local codes, or in the absence of local codes, the current National Electric Code, ANSI/NFPA 70 or the current Canadian Electrical Code CSA C22.1.

The Clean Air Act of 1990 bans the intentional venting of refrigerant as of July 1, 1992. Approved methods of

present sharp edges and care must be taken when equipment.

Failure to observe the following

WARNING

To prevent motor overheating compressors must cycle off for a

maintain the proper oil level

compressors must cycle on for a

starts per hour.

WARNING

instructions will result in premature failure of your system and possible voiding of the warranty.

Receiving Unit

When received, the unit should be checked for damage that might have occurred in transit. If damage is found it should be noted on the carrier’s Freight Bill. A request for inspection by carrier’s agent should be made in writing at once.

Nameplate should be checked to ensure the correct model sizes and voltages have been received to match the job requirements.

If repairs must be made to damaged goods, then the factory should be notified before any repair action is taken in order to protect the warranty. Certain equipment alteration, repair, and manipulation of equipment without the manufacturer’s consent may void the product warranty. Contact the AAON Warranty Department for assistance with handling damaged goods, repairs, and freight claims: (903) 236-4403.

Note: Upon receipt check shipment for items that ship loose such as filters and remote sensors. Consult order and shipment documentation to identify potential looseshipped items. Loose-shipped items may have been placed inside unit cabinet for security. Installers and owners should secure all doors with locks or nuts and bolts to prevent unauthorized access.

The warranty card must be completed in full and returned to AAON not more than 3 months after unit is delivered.

Figure 1 - Lockable Handle

Storage

If installation will not occur immediately following delivery, store equipment in a dry protected area away from construction traffic and in the proper orientation as marked on the packaging with all internal packaging in place. Secure all loose-shipped items.

Direct Expansion (DX) Systems

COMPRESSOR CYCLING

5 MINUTE MINIMUM OFF TIME

minimum of 5 minutes.

5 MINUTE MINIMUM ON TIME

minimum of 5 minutes.

The cycle rate must not exceed 6

All water-cooled condenser DX systems are factory assembled, leak tested, charged with R-410A refrigerant, and run tested.

Some units are equipped with compressor crankcase heaters,

CAUTION

result in overflow of condensate

All DX systems include evaporator coils, liquid line filter dryers, thermal expansion valves (TXV), and scroll compressors. Compressors are equipped with a positive pressure forced lubrication system.

CRANKCASE HEATER

which should be energized at least 24 hours prior to cooling operation, to clear any liquid refrigerant from the compressors.

Never turn off the main power supply to the unit, except for servicing, emergency, or complete shutdown of the unit. When power is cut off from the unit crankcase heaters cannot prevent refrigerant migration into the compressors. This means the compressor may cool down and liquid refrigerant may accumulate in the compressor. The compressor is designed to pump refrigerant gas and damage may occur when power is restored.

If power to the unit must be off for more than an hour, turn the thermostat system switch to "OFF", or turn the unit off at the control panel, and leave the unit off until the main power switch has been turned on again for at least 24 hours for units with compressor crankcase heaters. This will give the crankcase heater time to clear any liquid accumulation out of the compressor before it is started.

Always control the unit from the thermostat, or control panel, never at the main power supply, except for emergency or complete shutdown of the unit.

During the cooling season, if the air flow is reduced due to dirty air filters or any other reason, the cooling coils can get too cold which will cause excessive liquid to return to the compressor. As the liquid concentration builds up, oil is washed out of the compressor, leaving it starved for lubrication.

The compressor life will be seriously shorted by reduced lubrication and the pumping of excessive amounts of liquid oil and refrigerant.

Wiring Diagrams

Unit specific wiring diagrams are laminated and affixed inside the controls compartment door.

Condensate Drain Pans

Units require drain p-traps and lines to be connected to the condensate drain pans of the unit. The lines should be the same pipe size or larger than the drain connection, include a p-trap, and pitch downward toward drain. An air break should be used with long runs of condensate lines.

Waterside economizer coil units include a separate condensate drain pan which drains into the evaporator coil drain pan.

Unit should not be operated without a p-trap. Failure to install a p-trap may

water.

Minimum

Clearance Required

Access Door Sides

36 inches

All Other Sides

6 inches

Emergency drain pan is recommended for all applications where a risk of water damage to

Installation

AAON equipment has been designed for quick and easy installation.

Locating the Unit

Placement of the unit relative to ductwork, electrical and plumbing must be carefully considered. Return air plenum or duct can be mounted directly to the return air flanges. Use flexible gasket material to seal the duct to the unit.

Verify floor or foundation can support the total unit weight, including accessory weights. Unit must be level in both horizontal axes to support the unit and reduce noise and vibration from the unit.

Allow adequate service clearances as shown on the unit nameplate and unit drawing. Consult your local building codes for additional service clearance requirements.

Allow adequate space for piping access and panel removal. Condenser water piping and condensate drain connections are located on either side of the unit.

Table 1 - SB Series Clearances

Location

surrounding structure or furnishings. Refer to local codes.

Floor Mounted Units

Make sure the unit is level and mounted on a field supplied platform with a minimum height to allow for proper depth of the condensate line p-trap. Other installation provisions may be necessary according to job specifications. SB Series vertical air handling units are designed for up flow applications only.

Figure 2 - SB Series

the unit, injury or death. Lifting equipment capacity should exceed

of chemical corrosion is excluded from coverage under AAON Inc.

Connections and service

Right Hand Side

Compressor and Heat

SB Series

Top View

Air Flow

Consider the air flow to be

Exchanger Compartment

Left Hand Side

Lifting and Handling the Unit

Before lifting unit, be sure that all shipping material has been removed from unit.

Incorrect lifting can cause damage to

UNIT HANDLING

unit weight by an adequate safety factor. Always test lift unit not more than 24 inches high to verify proper center of gravity lift point.

Care should be taken if using spreader bars, blocking or other lifting devices to prevent damage to the cabinet, coil or fans.

Supply Air

Return Air

hitting the back of your head.

Figure 3 - SB Series Unit Orientation

Refrigerant-to-Water Heat Exchanger Water Piping

Condenser water pump, condenser water piping, cooling tower, pressure gauges, strainers, piping insulation and all components of the waterside piping must be field installed.

Open Loop Applications

This product contains one or more refrigerant-to-water heat exchangers made of cupronickel or copper and is subject to severe corrosion and failure when exposed to chlorides.

OPEN LOOP APPLICATIONS

Failure of the condenser as a result

warranties and the heat exchanger manufacturer’s warranties.

access on right side for

right hand orientation

Cleaning the cooling tower or condenser water loop with harsh

(muriatic acid), chlorine or other chlorides, can damage the

Care should be taken to avoid allowing chemicals to enter the

Corrosion Resistance for more

may result in premature failure of

Do not allow water containing any form of chlorides to enter this heat exchanger.

Common forms of chlorides include:

1. Sea water mist entering an open cooling tower system.

2. Contaminated make-up water containing salt water.

3. Disinfection the water loop with solutions containing sodium hypochlorite.

Chlorides will result in a premature failure of the condenser.

Failure of the condenser as a result of chemical corrosion is excluded from coverage under AAON warranties and the heat exchanger manufacturer warranties.

Failure of the condenser will allow water to enter the refrigerant circuit and will cause extensive damage to the refrigerant circuit components. Any damage to the equipment as a result of condenser failure from chemical corrosion due the fluid in the condenser is excluded from coverage under AAON warranties and the heat exchanger manufacturer warranties.

OPEN LOOP APPLICATIONS

Cupronickel refrigerant-to-water heat exchangers are recommended with all open loop applications. Failure to use a Cupronickel heat exchanger

your system and possible voiding of the warranty.

chemicals such as hydrochloric acid

refrigerant-to-water heat exchanger.

refrigerant-to-water heat exchanger. See Appendix A - Heat Exchanger

information.

Freezing Water in the Heat Exchanger

This product contains one or more refrigerant-to-water heat exchangers. A refrigerant-to-water heat exchanger contains refrigerant in one passage and water in another passage. Water is subject to freezing at 32°F. When water freezes in a heat exchanger significant forces are exerted on the components of the heat exchanger where the water is confined.

Failure of the condenser due to freezing will allow water to enter the refrigerant circuit and will cause extensive damage to the refrigerant circuit components. Any damage to the equipment as a result of water freezing in the condenser is excluded from coverage under AAON warranties and the heat exchanger manufacturer warranties.

% Glycol

Ethylene

Glycol

Propylene

Glycol

18°F

19°F

7°F

9°F

-7°F

-6°F

-28°F

-27°F

Prior to connection of condensing

or death due to instantaneous

water piping. Supply water

Failure of the condenser due to

refrigerant circuit and will cause

from coverage under AAON

chemicals. Polyolester (POE) oils

410A and other

and fittings and complete piping

WATER FREEZING

freezing will allow water to enter the

extensive damage to the refrigerant circuit components. Any damage to the equipment as a result of water freezing in the condenser is excluded

warranties and the heat exchanger manufacturer warranties.

Unit is capable of operating with Entering Water Temperatures (EWT) as low as 57°F during cooling mode without the need for head pressure control. If the EWT is expected to be lower than 57°F or more stable operation is desired, a factory provided head pressure control water valve option is available.

Glycol solution should be used if ambient temperatures are expected to fall below freezing or if the loop water temperature is below 50°F while operating in the heating mode (heat pump units only). Adding glycol to condenser water causes an increase in pressure drop resulting in a decrease in unit performance. A minimum concentration of 20% glycol solution is recommended.

Table 2 - Glycol Freezing Points

Water loop piping runs through unheated areas or outside the building should be insulated.

Water Piping

Installing contractor must ensure a differential pressure switch or water flow switch is installed between the condenser water supply and return connections. This sensor provides a signal to the unit controller that water flow is present in the heat exchanger and the unit can operate without damaging unit components.

water supply, verify water pressure is less than maximum pressure shown on unit nameplate. To prevent injury

release of high pressure water, relief valves should be field supplied on

connection may require a backflow preventer to prevent supply makeup water from backing up into the public water system.

WATER PRESSURE

PVC (Polyvinyl Chloride) and CPVC (Chlorinated Polyvinyl Chloride) are vulnerable to attack by certain

used with Rrefrigerants, even in trace amounts, in a PVC or CPVC piping system will result in stress cracking of the piping

system failure.

Only use approved water pipe material. Avoid using galvanized material for water lines/fittings as the material is corrosive and may cause fouling of the water system.

Supply and Return

(in. FPT)

003, 004, 005

006, 007, 009, 010

1 1/4

014, 016, 018

1 1/2

to the unit should incorporate

CAUTION

Improper fluid

flow due to valves, piping, or

Table 3 - Condenser Water Connections

Model (SB-)

Connection Size

Condenser water pump must be field sized and installed between the cooling tower or geothermal wellfield and self contained unit. System should be sized in accordance with the ASHRAE Handbook. Use engineering guidelines to maintain equal distances for supply and return piping and limit bend radiuses to maintain balance in the system. Balancing valves, permanent thermometers and gauges may be required.

Installing contractor is responsible for properly sizing and installing water system components.

improper pump operation may result in unacceptable unit operation and void warranty.

Follow national and local codes when installing water piping. Connections

vibration eliminators to reduce noise and vibration and shutoff valves to facilitate servicing. Supply and return water piping must be at least as large as the unit connections and larger depending on length of runs, rise and bends.

WATER PIPING

Before connection to the unit, the condenser water system should be flushed to remove foreign material that could cause condenser fouling. Install a screen strainer with a minimum of 20 Mesh ahead of the condenser inlet to prevent condenser fouling and internal tube damage. Mineral content of the condenser water must be controlled. All make-up water has minerals in it and as the water is evaporated in the cooling tower, these minerals remain. As the mineral content of the water increases, the conductivity of the water increases.

Field provided and installed water treatment program must be compatible with stainless steel, copper, aluminum, ABS plastic, and PVC. Batch feed processes should never be used as concentrated chemicals can cause corrosion. Never use hydrochloric acid (muriatic acid) or chlorine as it will corrode stainless steel.

Water loop piping runs through unheated areas or outside the building should be insulated.

NOTE: Ball valves should be installed in the condenser water supply and return lines for unit isolation and water flow balancing. All manual flow valves should be of the ball valve design. Globe or gate valves should not be used due to high pressure drops and poor throttling characteristics.

Pressure and temperature ports are recommended in condenser water supply and return lines for system balancing. These openings should be 5 to 10 pipe diameters from the unit water connections. To allow for mixing and temperature stabilization, wells in the water piping should extend at least ½ pipe diameter into the pipe.

The foam insulation releases

Disconnect all electrical power

in injury or death from electrical shock or entanglement in moving

Piping systems should not exceed 10 ft/sec fluid velocity to ensure tube wall integrity and reduce noise.

Electrical

Verify the unit nameplate agrees with power supply. SB Series units are provided with single point power wiring connections. Connection terminations are made to the main terminal block. A complete set of unit specific wiring diagrams, showing factory and field wiring are laminated in plastic and located inside the controls compartment door.

sources before servicing the unit. More than one power source may be provided. Failure to do so may result

parts.

All units require field supplied electrical overcurrent and short circuit protection. Device must not be sized larger than the Maximum Overcurrent Protection (MOP) shown on the unit nameplate.

Codes may require a disconnect switch be within sight of the unit.

It is recommended that the field installed overcurrent protection or disconnect switch not be installed on the unit.

Electrical supply can enter through the bottom or side of the controls compartment. Entry must be field cut into panels of the unit.

A single point connection to a terminal block is provided. Split units may require

connection between the units. High voltage conductors should enter the control panel in a separate opening and separate conduit than 24V low voltage conductors.

dangerous fumes when it is burnt. Do not cut a foam part with a cutting torch or plasma cutter. Do not weld to a foam filled part.

Note: Locations for field cut electrical entries are marked on the unit. Field cut openings must be a minimum of 6 inches away from all components and wiring to prevent damage due to drilling or cutting.

To pass wires through the wall or roof of the unit, a hole should be cut and conduit passed through it. Use the following procedure to cut a round hole in a foam panel.

Cutting Electrical Openings

1. Locate the placement of the hole. Be sure that the conduit will not interfere with the operation of any component or prevent access of any door or removable panel.

2. Drill a pilot hole all the way through the foam panel.

3. Using a hole saw cut the hole through the metal on both sides of the foam part.

4. With a knife cut the foam out of the hole.

5. After the conduit is installed in the hole caulk the entire perimeter of the hole on both sides with an industrial grade silicone sealant or a duct seal compound.

If a larger cut-out is needed for additional duct connections not provided by the factory, or for any other reason, it is very important that the foam be completely sealed. Insulation covers should be fabricated from sheet metal to cover the

cause motor overheating and

Rotation must be checked on all

at the unit power connection.

CAUTION

foam at the cut. The edges and corners that are not covered should then be sealed using silicone caulking or a duct seal compound.

If a reciprocating saw is used to make the cut-out take care that the metal skins of the foam part do not separate from the foam, this would result in reduced structural integrity of the part.

Size supply conductors based on the unit Minimum Current Ampacity (MCA) rating. Supply conductors must be rated a minimum of 75°C.

Protect the branch circuit in accordance with code requirements. The unit must be electrically grounded in accordance with local codes, or in the absence of local codes, the current National Electric Code, ANSI/NFPA 70 or the current Canadian Electrical Code CSA C22.1.

Note: Units are factory wired for 208V, 230V, 460V, or 575V. In some units, the 208V and 230V options may also be provided in single or three phase configurations. The transformer configuration must be checked by a qualified technician prior to startup.

Wire power leads to the unit’s terminal block or main disconnect. All wiring beyond this point has been completed by AAON and cannot be modified without effecting the unit’s agency/safety certification.

Supply voltage must be within the min/max range shown on the unit nameplate. Available short circuit current should not exceed the short circuit current rating (SCCR) shown on the unit nameplate.

Three phase voltage imbalance will

premature failure.

Three phase voltage imbalance will cause motor overheating and premature failure. The maximum allowable imbalance is 2.0%.

Voltage imbalance is defined as 100 times the maximum deviation from the average voltage divided by the average voltage.

Example: (221V+230V+227V)/3 = 226V, then 100*(226V-221V)/226V = 2.2%, which exceeds the allowable imbalance.

Check voltage imbalance at the unit disconnect switch and at the compressor terminal. Contact your local power company for line voltage corrections.

Installing contractor must check for proper motor rotation and check blower motor amperage listed on the motor nameplate is not exceeded.

MOTORS AND COMPRESSORS of three phase units. Supply fan motors should all be checked by a qualified service technician at startup and any wiring alteration should only be made

Wire Size (Stranded)

Only

Total Wire Distance

20 AWG

200 ft

18 AWG

350 ft

16 AWG

500 ft

14 AWG

750 ft

12 AWG

1250 ft

the wrong direction. Low pressure

disconnected after factory testing. Rotation should be checked by a

gauges and any wiring alteration should only be made at the unit

Scroll compressors are directional and will be damaged by operation in

switches on compressors have been

qualified service technician at startup using suction and discharge pressure

power connection.

Wire control signals to the unit’s low voltage terminal block located in the controls compartment.

If any factory installed wiring must be replaced, use a minimum 105°C type AWM insulated conductors.

Thermostat Control Wiring

If a thermostat is used for unit control, thermostat should be located on an inside wall 4-5 feet above the floor where it will not be subjected to drafts, sun exposure, or heat from electrical fixtures of appliances. Control wiring must deliver adequate voltage to components to assure proper operation. Control voltage returning from controller circuit must be a minimum of 21 VAC. To assure proper wiring use the following chart to determine the allowable wiring distances.

Table 4 - Control Wiring

- Copper Conductors

Allowable

Total Wire Distance Allowable = (Quantity of Control Wires) x (Control Wire Distance)

Take the total wire distance allowable and divide by the number of wires to be connected. This indicates the distance allowable for that size wire. The wiring to the unit must not exceed the total wire distance allowable. If the voltage at the connectors is less than 21 VAC, isolation relays must be installed. If under external control 21 VAC must be field verified.

All external devices must be powered via a separate external power supply.

Example: A total of 8 wires must be pulled 75ft to a control the unit. What size wire should be used?

According to the Table 2, 16 AWG allows for 63ft (500 ft/8 wires) and 14 AWG allows for 94ft (750 ft/8 wires). Thus, 14 AWG should be used.

Duct Connection

Remove shipping covers and attach duct to flanges provided on the unit. The installer is responsible for sealing ducts to the flanges to prevent water leaks.

Intake air enters the back of the SB Series unit, where the air filters are located. Ductwork should be sized in accordance with the ASHRAE Handbook. Ductwork should be installed in accordance with NFPA Standard 90A.

When attaching duct to the unit, use a flexible/compressible material rated for duct connections. A three inch flexible connector for both return and supply duct connections is recommended.

Draw-Through

Drain Pan Pressure

Trap Dimensions

Negative Static

X/2

(inches of water)

(inch)

-0.50

1.50

0.75

-1.00

2.00

1.00

-1.50

2.50

1.25

-2.00

3.00

1.50

-2.50

3.50

1.75

-3.00

4.00

2.00

result in overflow of condensate

Condensate Drain Piping

Unit may be equipped with more than one condensate drain pan connection. A p-trap and drain line must be installed on at least one section’s drain connection, with the ptrap not to exceed 6” from the drain connection. The lines should be the same pipe size or larger than the drain connection, include a p-trap, and pitch downward toward drain. An air break should be used with long runs of condensate lines.

Unit should not be operated without p-traps. Failure to install a p-trap may

water.

Draw-through cooling coils will have a negative static pressure in the drain pan area. This will cause an un-trapped drain to back up due to air being pulled up through the condensate drain piping.

Condensate drain trapping and piping should conform to all applicable governing codes.

Note: The drain pan connection(s) is a 1” MPT fitting.

The X dimension on the draw-through trap should be at least equal to the absolute value of the negative static pressure in the drain pan plus one inch. To calculate the static pressure at the drain pan add the pressure drops of all components upstream of the drain pan, including the cooling coil, and add the return duct static pressure. Include the dirt allowance pressure drop for the filters to account for the worst-case scenario.

The height from top of the bottom bend of the trap to the bottom of the leaving pipe must be at least equal to one half of the X dimension. This ensures that enough water is stored in the trap to prevent losing the drain seal during unit startup

Note: The absolute value of the fan inlet pressure will always be greater than or equal to the absolute value of the static pressure in the drain pan on draw-through units, so the fan inlet pressure is a safe value to use for the drain pan static pressure.

Table 5 - Drain Trap Dimensions

Figure 4 - Drain Trap

Waterside Economizer

Cooling and pre-cooling waterside economizer coil is factory installed upstream of the evaporator coil. Factory tested and field installed water piping kit includes fully modulating waterside economizer valve and fully modulating waterside economizer bypass valve.

Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Installation and service must be

WARNING

The waterside economizer circuit can operate in three modes: waterside economizer only, waterside economizer with mechanical cooling, and mechanical cooling only.

During waterside economizer only mode of operation condenser water flows through the waterside economizer coil with modulating valves maintaining supply air temperature setpoint. The condenser water then passes through water-cooled condenser.

During waterside economizer with mechanical cooling mode of operation condenser water flows through the waterside economizer coil with the waterside economizer modulating valve fully open. The condenser water then passes through water-cooled condenser.

During mechanical cooling only mode of operation condenser water flows around the waterside economizer coil with the waterside economizer bypass valve fully open. The condenser water then passes through water-cooled condenser.

Waterside economizer coil condensate drain outlet drains into evaporator coil drain pan. See the previous section on evaporator coil condensate drain piping.

Mineral content of the condenser water must be controlled. All make-up water has minerals in it and as the water is evaporated in the cooling tower, these minerals remain. As the mineral content of the water increases, the conductivity of the water increases.

corrosion. Never use hydrochloric acid (muriatic acid) or chlorine as it will corrode stainless steel.

Heating Coils

Factory installed one or two row hot water and steam heating coils can be factory mounted. These coils are supplied from a source through separate piping from the condenser water source. All controls for heating operation are field supplied and field installed.

Always connect the supply to the top of the coil and the return to the bottom. Water coils should not be subjected to entering air temperatures below 38°F to prevent coil freeze-up. If air temperature across the coil is going to be below this value, use a glycol solution to match the coldest air expected.

Piping shall be in accordance with national and local codes. Pressure limiting devices, backflow preventers and all other safety requirements are the sole responsibility of the installing contractor.

Startup

(See back of the manual for startup form)

performed by a qualified installer. A copy of this IOM should be kept with the unit.

Electric shock hazard. Shut off all electrical power to the unit to avoid shock hazard or injury from rotating parts.

During startup, it is necessary to perform routine checks on the performance of the unit. This includes checking of the air flow, the air filters, condenser water flow and refrigerant charge.

Supply Fans

SB Series units are equipped with direct drive backward curved plenum supply fan assemblies that deliver the air volume specified according to unit size and job requirements.

Figure 5 - SB Series Supply Fan

Supply Fan Airflow Adjustment

Supply fan Electronically Commutated Motors (ECM) speed adjustment may be required at startup for airflow adjustment.

With WattMaster controls supply fans are controlled directly from the controller with a 0-10 VDC signal.

With customer provided field installed controls the supply fans can be controlled with either a factory installed potentiometer or with a 0-10 VDC signal provided by the controller.

Figure 6 - ECM with Factory Provided Controls

Figure 7 - ECM with Potentiometer Control

Figure 8 - ECM with Field Installed Controls

Before completing startup and

venting of refrigerant

recycling or reclaiming must be

Filters

Do not operate the unit without filters in place. Unit should be checked for correct filter placement during startup. Operation of the equipment without filters will result in a clogged evaporator coil.

leaving the unit a complete operating cycle should be observed to verify that all components are functioning properly.

Adjusting Refrigerant Charge

Adjusting the charge of a system in the field must be based on determination of liquid sub-cooling and evaporator superheat. On a system with a TXV liquid sub-cooling is more representative of the charge than evaporator superheat but both measurements must be taken.

Before Charging

Unit being charged must be at or near full load conditions before adjusting the charge.

The Clean Air Act of 1990 bans the intentional (CFC’s and HCFC’s) as of July 1,

1992. Approved methods of recovery,

followed. Fines and/or incarceration may be levied for non-compliance.

Units equipped with hot gas reheat must be charged with the hot gas reheat valves closed while the unit is in cooling mode to get the proper charge. After charging, unit should be operated in reheat

(dehumidification) mode to check for correct operation.

After adding or removing charge the system must be allowed to stabilize, typically 10-15 minutes, before making any other adjustments.

The type of unit and options determine the ranges for liquid sub-cooling and evaporator superheat. Refer to the tables below when determining the proper sub-cooling.

Checking Liquid Sub-Cooling

Measure the temperature of the liquid line as it leaves the condenser.

Read the gauge pressure at the liquid line close to the point where the temperature was taken. Use liquid line pressure as it will vary from discharge pressure due to condenser pressure drop.

Convert the pressure obtained to a saturated temperature using the appropriate refrigerant temperature-pressure chart.

Subtract the measured liquid line temperature from the saturated temperature to determine the liquid sub-cooling. Compare calculated sub-cooling to the table below for the appropriate unit type and options.

Checking Evaporator Superheat

Measure the temperature of the suction line close to the compressor.

Read gauge pressure at the suction line close to the compressor.

Convert the pressure obtained to a saturated temperature using the appropriate refrigerant temperature-pressure chart.

Water-Cooled

Condenser

Sub-Cooling

6-10°F

Sub-Cooling with

Hot Gas Reheat

Superheat

8-15°F

Refrigerant overcharging leads to

Thermal expansion valve must be

suction superheat. Failure to have

CAUTION

Refrigerant overcharging leads to

Subtract the saturated temperature from the measured suction line temperature to determine the evaporator superheat.

Compare calculated superheat to the table below for the appropriate unit type and options.

DO NOT OVERCHARGE!

excess refrigerant in the condenser coils resulting in elevated compressor discharge pressure.

Table 6 - Acceptable Water-Cooled

Refrigeration Circuit Values

Adjusting Sub-Cooling and Superheat Temperatures

The system is overcharged if the sub-cooling temperature is too high and the evaporator is fully loaded (low loads on the evaporator result in increased sub-cooling) and the evaporator superheat is within the temperature range as shown in the table above (high superheat results in increased sub-cooling).

Correct an overcharged system by reducing the amount of refrigerant in the system to lower the sub-cooling.

excess refrigerant in the condenser coils resulting in elevated compressor discharge pressure.

DO NOT OVERCHARGE!

8-12°F

The system is undercharged if the superheat is too high and the sub-cooling is too low

adjusted to approximately 8-15°F of

sufficient superheat will damage the compressor and void the warranty.

Correct an undercharged system by adding refrigerant to the system to reduce superheat and raise sub-cooling.

If the sub-cooling is correct and the superheat is too high, the TXV may need adjustment to correct the superheat.

°F

PSIG

°F

PSIG

°F

PSIG

°F

PSIG

°F

PSIG

78.3

134.7

213.7

101

321.0

128

463.2

80.0

137.2

217.1

102

325.6

129

469.3

81.8

139.7

220.6

103

330.2

130

475.4

83.6

142.2

224.1

104

334.9

131

481.6

85.4

144.8

227.7

105

339.6

132

487.8

87.2

147.4

231.3

106

344.4

133

494.1

89.1

150.1

234.9

107

349.3

134

500.5

91.0

152.8

238.6

108

354.2

135

506.9

92.9

155.5

242.3

109

359.1

136

513.4

94.9

158.2

246.0

110

364.1

137

520.0

96.8

161.0

249.8

111

369.1

138

526.6

98.8

163.8

253.7

112

374.2

139

533.3

100.9

166.7

257.5

113

379.4

140

540.1

102.9

169.6

261.4

114

384.6

141

547.0

105.0

172.5

265.4

115

389.9

142

553.9

107.1

175.4

269.4

116

395.2

143

560.9

109.2

178.4

273.5

117

400.5

144

567.9

111.4

181.5

277.6

118

405.9

145

575.1

113.6

184.5

281.7

119

411.4

146

582.3

115.8

187.6

285.9

120

416.9

147

589.6

118.1

190.7

290.1

121

422.5

148

596.9

120.3

193.9

294.4

122

428.2

149

604.4

122.7

197.1

298.7

123

433.9

150

611.9

125.0

200.4

303.0

124

439.6

127.4

203.6

307.5

125

445.4

129.8

207.0

311.9

126

451.3

132.2

210.3

100

316.4

127

457.3

Table 7 - R-410A Refrigerant Temperature-Pressure Chart

Improper installation, adjustment,

service or maintenance can cause property damage, personal injury or loss of life. Installation and service must be

WARNING

To prevent motor overheating compressors must cycle off for a

To maintain the proper oil level compressors must cycle on for a

starts per hour.

WARNING

Operation

Unit operations should be controlled with thermostat or unit controller, never at the main power supply, except for emergency or complete shutdown of the unit.

Packaged DX Cooling Operation and Control

When a call for cooling is made the supply fan motors and compressors will energize.

Electric Heating Operation

When a call for heating (G and W1, W2, etc.) is made the supply fan motors and electric resistance heaters will energize. Heating is accomplished by passing electrical current through a specified amount of resistance heaters which will produce the required heat.

On a fault condition the main limit located in the supply air or the auxiliary limit located downstream the supply blower will remove power from all contactors.

Steam or Hot Water Preheating Operation

Valve control for steam and hot water heating coils are by others. Heating is accomplished by passing steam or hot water

COMPRESSOR CYCLING

5 MINUTE MINIMUM OFF TIME

minimum of 5 minutes.

5 MINUTE MINIMUM ON TIME

minimum of 5 minutes.

The cycle rate must not exceed 6

through the steam or hot water coil assembly.

Maintenance

(See back of the manual for maintenance log.)

At least once each year, a qualified service technician should check out the unit. Supply fans, evaporator coils and air filters should be inspected monthly.

alteration,

performed by a qualified installer. A copy of this IOM should be kept with the unit.

Periodically during operation, it is necessary to perform routine service checks on the performance of the unit. This includes checking of the air flow, the air filters, condenser water flow and refrigerant charge.

See Startup section for information on air flow adjustment and refrigerant charge adjustment.

DX Cooling

Set unit controls to cooling mode of operation with supply fans on. Check the fans for correct operating direction, amperage and voltage. Check compressor operation, rotation, amperage and voltage to the unit nameplate (check the amperage on the load side of the compressor contactor).

Condensate Drain Pans

Drain pans will have moisture present and require periodic cleaning to prevent microbial growth. Cleaning of the drain pans will also prevent any possible plugging of the drain lines and overflow of the pan itself.

parts.

WARNING

air should

bend the fin edges and increase

performance or nuisance unit

Cleaning of the drain pans and inside of the unit should be done only by qualified personnel.

E-Coated Coil Cleaning

Documented routine cleaning of e-coated coils is required to maintain coating warranty coverage.

Electric shock hazard. Shut off all electrical power to the unit to avoid shock hazard or injury from rotating

Surface loaded fibers or dirt should be removed prior to water rinse to prevent restriction of airflow. If unable to back wash the side of the coil opposite of the coils entering air side, then surface loaded fibers or dirt should be removed with a vacuum cleaner. If a vacuum cleaner is not available, a soft non-metallic bristle brush may be used. In either case, the tool should be applied in the direction of the fins. Coil surfaces can be easily damaged (fin edges bent over) if the tool is applied across the fins.

Use of a water stream, such as a garden hose, against a surface loaded coil will drive the fibers and dirt into the coil. This will make cleaning efforts more difficult. Surface loaded fibers must be completely removed prior to using low velocity clean water rinse.

A monthly clean water rinse is recommended for coils that are applied in coastal or industrial environments to help to remove chlorides, dirt, and debris. It is very important when rinsing, that water temperature is less than 130°F and pressure is than 900 psig to avoid damaging the fin edges. An elevated water temperature (not to exceed 130°F) will reduce surface tension, increasing the ability to remove chlorides and dirt.

High velocity water from a pressure washer or compressed only be used at a very low pressure to prevent fin and/or coil damages. The force of the water or air jet may

airside pressure drop. Reduced unit

shutdowns may occur.

Quarterly cleaning is essential to extend the life of an e-coated coil and is required to maintain coating warranty coverage.

Coil cleaning shall be part of the unit’s regularly scheduled maintenance procedures. Failure to clean an e-coated coil will void the warranty and may result in reduced efficiency and durability.

Harsh chemicals, household bleach, or acid cleaners should not be used to clean outdoor or indoor e-coated coils. These cleaners can be very difficult to rinse out of the coil and can accelerate corrosion and attack the e-coating. If there is dirt below the surface of the coil, use the recommended coil cleaners.

For routine quarterly cleaning, first clean the coil with the below approved coil cleaner. After cleaning the coils with the approved cleaning agent, use the approved chloride remover to remove soluble salts and revitalize the unit.

Recommended Coil Cleaner

The following cleaning agent, assuming it is used in accordance with the manufacturer’s directions on the container for proper mixing and cleaning, has been approved for use on e-coated coils to remove mold, mildew,

Electric shock hazard. Shut off all

WARNING

dust, soot, greasy residue, lint and other particulate:

Enviro-Coil Concentrate, Part Number HEC01.

Recommended Chloride Remover

CHLOR*RID DTS™ should be used to remove soluble salts from the e-coated coil, but the directions must be followed closely. This product is not intended for use as a degreaser. Any grease or oil film should first be removed with the approved cleaning agent.

Remove Barrier - Soluble salts adhere themselves to the substrate. For the effective use of this product, the product must be able to come in contact with the salts. These salts may be beneath any soils, grease or dirt; therefore, these barriers must be removed prior to application of this product. As in all surface preparation, the best work yields the best results.

Apply CHLOR*RID DTS - Apply directly onto the substrate. Sufficient product must be applied uniformly across the substrate to thoroughly wet out surface, with no areas missed. This may be accomplished by use of a pump-up sprayer or conventional spray gun. The method does not matter, as long as the entire area to be cleaned is wetted. After the substrate has been thoroughly wetted, the salts will be soluble and is now only necessary to rinse them off.

Rinse - It is highly recommended that a hose be used, as a pressure washer will damage the fins. The water to be used for the rinse is recommended to be of potable quality, though a lesser quality of water may be used if a small amount of CHLOR*RID DTS is added. Check with CHLOR*RID International, Inc. for recommendations on lesser quality rinse water.

Supply Fans

Blower wheels must be inspected for excessive dust build up periodically and cleaned if required. Excessive dust build up on blower wheels may cause an unbalanced state; leading to vibration and/or component failure. Damages due to excessive dust build up will not be covered under factory warranty.

electrical power to the unit to avoid shock hazard or injury from rotating parts.

Supply Fan Lubrication

All original blower motors and bearings are furnished with factory lubrication. Some applications will require that bearings be relubricated periodically. The schedule will depend on the operating duty, temperature variations or other severe atmospheric conditions.

Bearings should be re-lubricated when at normal operating temperatures, but not running. Rotate the fan shaft by hand and add only enough grease to purge the seals. DO NOT OVERLUBRICATE.

Recommended greases are: SHELL OIL - DOLIUM R CHEVRON OIL - SRI No. 2 TEXACO INC. - PREMIUM R

Feature 6A

Quantity/Size

Type

No Pre Filters

1/24” x 24” x 2”

Pleated, 30% Eff, MERV 8

Feature 6B

Quantity/Size

Type

No Standard Filters

1/24” x 24” x 2”

Pleated, 30% Eff, MERV 8

Pleated, 65% Eff, MERV 11

Pleated, 85% Eff, MERV 13

Pleated, 95% Eff, MERV 14

Feature 6A

Quantity/Size

Type

No Pre Filters

4/16” x 20” x 2”

Pleated, 30% Eff, MERV 8

Feature 6B

Quantity/Size

Type

No Standard Filters

4/16” x 20” x 2”

Pleated, 30% Eff, MERV 8

Pleated, 65% Eff, MERV 11

Pleated, 85% Eff, MERV 13

Pleated, 95% Eff, MERV 14

Filter Replacement

Monthly filter inspection is required to maintain optimum unit efficiency.

Electric shock hazard. Shut off all electrical power to the unit to avoid shock hazard or injury from rotating parts.

It is strongly recommended that filter media be replaced monthly. Filters are located upstream of the evaporator coil. Open access panel and pull filters straight out to inspect all of the filters. Replace filters with the size indicated on each filter. Arrow on the replacement filters must point towards the blower.

Replacement Parts

Parts for AAON equipment may be obtained from AAON at www.aaonparts.com. When ordering parts, reference the unit serial number and part number.

AAON Longview Product Support

203 Gum Springs Road Longview, TX 75602 Ph: 903-236-4403 Fax: 903-236-4463 www.aaon.com

Note: Before calling, technician should have model and serial number of the unit available to help answer questions regarding the unit.

Filter Information

Table 8 - 3-5 ton (B Cabinet) Pre and Unit Filters

1/24” x 24” x 4”

Table 9 - 6-10 ton (C Cabinet) Pre and Unit Filters

4/16” x 20” x 4”

Feature 6A

Quantity/Size

Type

No Pre Filters

4/18” x 24” x 2”

Pleated, 30% Eff, MERV 8

Feature 6B

Quantity/Size

Type

No Standard Filters

4/18” x 24” x 2”

Pleated, 30% Eff, MERV 8

Pleated, 65% Eff, MERV 11

Pleated, 95% Eff, MERV 14

Filter Type

Quantity/Size

Type

Pre Filters

1/24” x 24” x 2”

2” Pleated, 30% Eff, MERV 8

High Efficiency

Filters

Secondary High

Efficiency Filters

Filter Type

Quantity/Size

Type

Pre Filters

4/16” x 20” x 2”

2” Pleated, 30% Eff, MERV 8

High Efficiency

Filters

Secondary High

Efficiency Filters

Filter Type

Quantity/Size

Type

Pre Filters

4/18” x 24” x 2”

2” Pleated, 30% Eff, MERV 8

High Efficiency

Filters

Secondary High

Efficiency Filters

Table 10 - 14-18 ton (D Cabinet) Pre and Unit Filters

D Pleated, 85% Eff, MERV 13

Table 11- 3-5 ton (B Cabinet) Mixing Box Filters

Table 12 - 6-10 ton (C Cabinet) Mixing Box Filters

Table 13 - 14-18 ton (D Cabinet) Mixing Box Filters

4/18” x 24” x 4”

1/24” x 24” x 4” 4” Pleated

4/16” x 20” x 4” 4” Pleated

4/18” x 24” x 4” 4” Pleated

Water

Containing

Concentration

(mg/l or ppm)

Time Limits -

Analyze Before

AISI

316

SMO

254

Copper

Alloy

Nickel

Alloy

< 70

+ + 0 + 70-300

+ + + + > 300

+ + 0/+

< 70

+ + + + 70-300

+ + 0/- + > 300

0 0 -

> 1.0

+ + + + < 1.0

+ + 0/-

< 10µS/cm

+ + 0 + 10-500 µS/cm

+ + + + > 500 µS/cm

+ + 0

< 6.0

0 0 0 + 6.0-7.5

0/+ + 0 + 7.5-9.0

+ + +

> 9.0

+ + 0

< 2

+ + + + 2-20

+ + 0 + > 20

+ + -

< 300

+ + + + > 300

0 + 0/+

< 1

+ + + + 1-5

+ + 0 + > 5

0/+ + 0/-

Hydrogen

< 0.05

+ + + + > 0.05

+ + 0/-

< 5

+ + + + 5-20

+ + 0 + > 20

+ + -

Appendix A - Heat Exchanger Corrosion Resistance

The resistance guide below provides the corrosion resistance of stainless steel type AISI 316 and pure Copper (99.9%) in water, to a number of important chemical factors. The actual corrosion is a very complex process influenced by many different factors in combination.

Explanations: + Good resistance under normal conditions 0 Corrosion problems may occur especially when more factors are valued 0

- Use is not recommended

Alkalinity

/ SO

)

(HCO

Sulfate (SO

HCO

Electrical

Conductivity

Ammonium

(NH

)

Chlorides (Cl-)*

Free Chlorine

(Cl2)

Within 24 Hours

No Limit

Within 24 Hours

No Limit

Within 5 Hours

Sulfide (H2S)

Free (aggressive)

Carbon Dioxide

(CO

*See Also Chloride Content Table

No Limit

Water

Containing

Concentration

(mg/l or ppm)

Time Limits -

Analyze Before

AISI

316

SMO

254

Copper

Alloy

Nickel

Alloy

Total Hardness

(°dH)

< 100

+ + + + > 100

+ + 0

< 0.2

+ + + + > 0.2

+ + 0

< 0.2

+ + + + > 0.2

+ + 0

< 0.1

+ + + + > 0.1

+ + 0

Maximum Temperature

60°C (140°F)

80°C (176°F)

120°C (248°F)

130°C (266°F)

= 10 ppm

SS 304

SS 316

= 25 ppm

SS 304

SS 316

= 50 ppm

SS 304

SS 316

Ti / SMO 254

= 80 ppm

SS 316

Ti / SMO 254

= 150 ppm

SS 316

Ti / SMO 254

= 300 ppm

SS 316

Ti / SMO 254

> 300 ppm

Ti / SMO 254

4.0-8.5 No Limit + + + +

Nitrate (NO3)

Iron (Fe)

Aluminum (Al)

Manganese (Mn)

Chloride Content

No Limit

Chloride Content

Address:______________________________________________________________________

______________________________________________________________________________

Model Number:_________________________________________________________________

Serial Number:_____________________________________________

Tag:_______________

Startup Contractor:______________________________________________________________

Address:______________________________________________________________________

_______________________________________________________

Phone:______________

Installing contractor should verify the following items.

1. Is there any visible shipping damage?

Yes No

2. Is the unit level?

Yes No

3. Are the unit clearances adequate for service and operation?

Yes No

4. Do all access doors open freely and are the handles operational?

Yes No

5. Have all shipping braces been removed?

Yes No

6. Have all electrical connections been tested for tightness?

Yes No

7. Does the electrical service correspond to the unit nameplate?

Yes No

8. On 208/230V units, has transformer tap been checked?

Yes No

9. Has overcurrent protection been installed to match the unit nameplate

requirement?

Yes No

10. Have all set screws on the fans been tightened?

Yes No

11. Do all fans rotate freely?

Yes No

12. Does the field water piping to the unit appear to be correct per design

parameters?

Yes No

13. Is all copper tubing isolated so that it does not rub?

Yes No

14. Are air filters installed with proper orientation?

Yes No

15. Have condensate drain and p-trap been connected?

Yes No

SB Series Startup Form

Job Name:_______________________________________________

Date:______________

Pre Startup Checklist

Ambient Temperature

Ambient Dry Bulb Temperature ________°F

Ambient Wet Bulb Temperature ________°F

Number

Head

PSIG

Suction

PSIG 1

Saturated

Temperature

Line

Temperature

Discharge

N/A

Suction

N/A

Liquid

N/A

Saturated

Temperature

Line

Temperature

Discharge

N/A

Suction

N/A

Liquid

N/A

Water-Cooled Condenser

No Water Leaks

Condenser Safety Check

Water Flow ________ gpm

Supply Fan Assembly

Alignment

Compressors/DX Cooling

Check Rotation

Nameplate Amps________

VAV Controls_________________

Number L1 L2 L3

Refrigeration System 1 - Cooling Mode

Pressure

Refrigeration System 1 - Heating Mode (Heat Pump Only)

Pressure

Unit Configuration

Pressure

Sub-cooling Superheat

Water Inlet Temperature ________°F

Water Outlet Temperature ________°F

1. Has the entire system been flushed and pressure checked?

Yes No

2. Has the entire system been filled with fluid?

Yes No

3. Has air been bled from the heat exchangers and piping?

Yes No

4. Is the glycol the proper type and concentration (N/A if water)?

Yes No

5. Is there a minimum load of 50% of the design load?

Yes No

6. Has the water piping been insulated?

Yes No

Water/Glycol System

7. What is the freeze point of the glycol (N/A if water)? ______________________________

Entry Date

Action Taken

Name/Tel.

Maintenance Log

This log must be kept with the unit. It is the responsibility of the owner and/or maintenance/service contractor to document any service, repair or adjustments. AAON Service and Warranty Departments are available to advise and provide phone help for proper operation and replacement parts. The responsibility for proper startup, maintenance, and servicing of the equipment falls to the owner and qualified licensed technician.

Literature Change History

November 2012

First Revision, Rev. A, of the SB Series IOM.

December 2012

Manual updated with the voltage options corrected, option 1 = 230V/1Φ/60Hz and option 9 = 208V/1Φ/60Hz. Condensing unit only options and ECM driven fan airflow adjustment information added.

AAON

2425 South Yukon Ave.

Tulsa, OK 74107-2728

Phone: 918-583-2266

Fax: 918-583-6094

www.aaon.com

SB Series

Installation, Operation &

Maintenance

V14190 · Rev. A · 121227

(ACP 31227)

It is the intent of AAON to provide accurate and current product information. However, in the interest of product improvement, AAON reserves the right to change pricing, specifications, and/or design of its product without notice, obligation, or liability.

AAON® and AAONAIRE® are registered trademarks of AAON, Inc., Tulsa, OK.

AAON SB-018 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Safety

SB Base Model Description

General Information

Codes and Ordinances

Receiving Unit

Storage

Direct Expansion (DX) Systems

Wiring Diagrams

Condensate Drain Pans

Installation

Locating the Unit

Floor Mounted Units

Lifting and Handling the Unit

Refrigerant-to-Water Heat Exchanger Water Piping

Open Loop Applications

Freezing Water in the Heat Exchanger

Water Piping

Electrical

Cutting Electrical Openings

Thermostat Control Wiring

Duct Connection

Condensate Drain Piping

Waterside Economizer

Heating Coils

Startup

Supply Fans

Supply Fan Airflow Adjustment

Filters

Adjusting Refrigerant Charge

Operation

Packaged DX Cooling Operation and Control

Electric Heating Operation

Steam or Hot Water Preheating Operation

Maintenance

DX Cooling

Condensate Drain Pans

E-Coated Coil Cleaning

Recommended Coil Cleaner

Recommended Chloride Remover

Supply Fans

Filter Replacement

Replacement Parts

AAON Longview Product Support

Filter Information

Appendix A - Heat Exchanger Corrosion Resistance