Reznor YWMA Installation guide

Brand: Reznor

Model: YWMA

Type: Installation guide

Reznor YWMA is a gas-fired make-up air unit designed to provide a comfortable and safe indoor environment in commercial and industrial spaces. With a variety of features and capabilities, it offers efficient heating and ventilation solutions for various applications. The unit's compact design and flexible installation options make it suitable for both indoor and outdoor placement. It utilizes advanced technology to deliver precise temperature control, ensuring optimal comfort levels while minimizing energy consumption.

Revision: I-YWMA (08-20) 1027886-0

INSTALLATION ADDENDUM FOR Y SERIES

Supersedes: — (Original Version)

MODEL YWMA

⚠ WARNING ⚠

FIRE OR EXPLOSION HAZARD

• Failure to follow safety warnings exactly could result in serious injury or property damage.

• Installation and service must be performed by a qualiﬁed installer, service agency or the gas

supplier.

• Do not store or use gasoline or other ﬂammable vapors and liquids in the vicinity of this or

any other appliance.

WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electrical switch; do not use any phone in your building.

• Leave the building immediately.

• Immediately call your gas supplier from a neighbor’s phone. Follow the gas suppliers

instructions.

• If you cannot reach your gas supplier, call the ﬁre department.

DO NOT DESTROY. PLEASE READ CAREFULLY. KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.

I-YWMA (08-20) 1027886-0

TABLE OF CONTENTS

GENERAL INFORMATION ....................................................................................................................................... 3

Scope.....................................................................................................................................................................3

References ............................................................................................................................................................3

Important Safety Information ..............................................................................................................................3

Warranty ................................................................................................................................................................ 3

Installation Codes ................................................................................................................................................3

Clearances ............................................................................................................................................................3

Unit Dimensions ................................................................................................................................................... 4

INSTALLATION .........................................................................................................................................................8

Uncrating...............................................................................................................................................................8

Storage .................................................................................................................................................................. 8

Pre-Installation Checklist ....................................................................................................................................8

Rigging and Mounting .........................................................................................................................................8

Mechanical Connections .....................................................................................................................................8

Electrical Connections.........................................................................................................................................8

Piping Connections..............................................................................................................................................8

OPERATION .............................................................................................................................................................9

Startup ...................................................................................................................................................................9

Unit Control ...........................................................................................................................................................9

Unit Testing and Adjustment ............................................................................................................................. 10

MAINTENANCE ......................................................................................................................................................13

TROUBLESHOOTING ............................................................................................................................................13

INSTALLATION RECORD ......................................................................................................................................13

I-YWMA (08-20) 1027886-0

Important Safety Information

Please read all information in this manual thoroughly and become familiar with the capabilities and use of your

appliance before attempting to operate or maintain this unit. Pay attention to all dangers, warnings, cautions, and

notes highlighted in this manual. Safety markings should not be ignored and are used frequently throughout to

designate a degree or level of seriousness.

DANGER: A danger statement describes a potentially hazardous situation that if not avoided, will result in severe

personal injury or death and/or property damage.

WARNING: A warning statement describes a potentially hazardous situation that if not avoided, can result in severe

personal injury and/or property damage.

CAUTION: A caution statement describes a potentially hazardous situation that if not avoided, can result in minor

or moderate personal injury and/or property damage.

NOTE: A note provides important information that should not be ignored.

NOTE: Refer to all applicable safety information in the Installation/Operation manual listed in Table 1.

Warranty

Refer to the Warranty section in the Installation/Operation manual listed in Table 1.

Installation Codes

Refer to the Installation Codes section in the Installation/Operation manual listed in Table 1.

Clearances

Refer to the Clearances section in the Installation/Operation manual listed in Table 1.

GENERAL INFORMATION

This unit has been tested for capacity and efﬁciency so as to provide many years of safe and dependable comfort

providing it is properly installed and maintained. With regular maintenance, this unit will operate satisfactorily year

after year. Abuse, improper use, and/or improper maintenance can shorten the life of the appliance and create

unsafe hazards.

To achieve optimum performance and minimize equipment failure, it is recommended that periodic maintenance

be performed on this unit. The ability to properly perform maintenance on this equipment requires certain tools and

mechanical skills.

Installation should be done by a qualiﬁed agency in accordance with the instructions in this manual and in compliance

with all codes and requirements of authorities having jurisdiction.

Scope

This addendum for model YWMA is a supplement to the Y series installation manual D300530 I-Y (PN 273646).

References

Table 1. Related Technical Manuals Available from Factory Distributor

Technical Manual for YDHA, YDMA, and YDSA Models Form

PN*

Installation/Operation D300530 I-Y 273646

Operation/Maintenance/Service D300531 O-Y 273647

Replacement Parts P-Y 273651

*Also available at www.reznorhvac.com.

I-YWMA (08-20) 1027886-0

Figure 1. Cabinet 1A Dimensions

GENERAL INFORMATION—CONTINUED

Unit Dimensions

Dimensions of the unit are shown in Figure 1, Figure 2, Figure 3, and Figure 4.

NOTE: The dimension ﬁgures that follow show general arrangements. Units with energy recovery

options may vary. Chilled water connections may also vary. Contact Nortek support for more details.

LEFT SIDE VIEW

FRONT VIEW

TE: ALL DIMENSIONS ARE IN INCHES.

I-YWMA (08-20) 1027886-0

Figure 2. Cabinet 1B Dimensions

LEFT SIDE VIEW

TE: ALL DIMENSIONS ARE IN INCHES.

FRONT VIEW

I-YWMA (08-20) 1027886-0

Figure 3. Cabinet 2 Dimensions

GENERAL INFORMATION—CONTINUED

Unit Dimensions—Continued

FRONT VIEW

LEFT SIDE VIEW

TE: ALL DIMENSIONS ARE IN INCHES.

I-YWMA (08-20) 1027886-0

Figure 4. Cabinet 3 Dimensions

LEFT SIDE VIEW

NOTE: ALL DIMENSIONS ARE IN INCHES.

FRONT VIEW

I-YWMA (08-20) 1027886-0

INSTALLATION

Uncrating

The unit was test-operated and inspected at the factory prior to crating and was in operating condition. If the unit

has incurred any damage in shipment, document the damage with the transporting agency and immediately contact

the Factory Distributor.

Storage

⚠ CAUTION ⚠

To prevent damage to the unit, do not it store sitting on the ground.

If the unit is to be stored, take precautions to prevent condensate formation inside the electrical compartments and

motors.

Pre-Installation Checklist

 Check the rating plate for the gas speciﬁcations and electrical characteristics of the unit to ensure that they are

compatible with the gas and electric supplies at the installation site.

 Read this booklet and become familiar with the installation requirements of the unit. If you do not have knowledge

of local requirements, check with the local gas company or any other local agencies who might have requirements

concerning this installation.

 Make preparations for the necessary supplies, tools, and manpower.

Rigging and Mounting

Refer to any applicable information in the Mounting section in the Installation/Operation manual listed in Table 1.

Mechanical Connections

Refer to any applicable information in the Mechanical section in the Installation/Operation manual listed in Table

1. Ensure that the cooling section condensate drain and drain trap are in accordance with these instructions.

Electrical Connections

Refer to the wiring diagram provided with the unit.

Piping Connections

⚠ CAUTION ⚠

• Low limit temperature protection is not provided. If the entering air temperature is expected to be

<35°F (<1.7°C), the water coils must be protected with glycol (40% mixture) or by ﬁeld-installed

low limit temperature protection.

• Ensure that piping installation is in accordance with ASHRAE requirements and with local

building codes.

• Before connecting piping to the unit, the water supply and return lines must be ﬂushed to eliminate

any foreign material.

NOTE: Piping connection size and type (external or internal) are determined by the unit’s speciﬁc

order information. Refer to this order information for piping connection and coil performance

design information.

I-YWMA (08-20) 1027886-0

Cooling and heating water coil piping connections are available in external or internal connections. External piping

connections are shown in Figure 5. To avoid unexpected high head pressure and poor cooling/heating performance,

an air vent must be installed in the high side of the water line to discharge non-condensable air. In addition, the

following piping components are recommended:

• Water ﬂow switch: installed in-line to prevent possible freeze-up due to loss of water ﬂow

• Manual shutoff valves: for service convenience

• Circuit-balancing valve (with pressure and temperature gauge connections): installed in water line for

balancing and service

Figure 5. External Piping Connections

OPERATION

Startup

To ensure safe reliable operation, refer to any applicable information in the checklists from the following sections in

the Installation/Operation manual listed in Table 1:

 Checklist Prior to Startup section

 Startup Checklist section

Unit Control

NOTE: For speciﬁc wiring termination details, refer to the wiring diagram provided with the unit.

A description of the unit control interface is as follows:

• Control voltage: the supplied control transformers are intended only for factory-control circuits. They are not to

be used as a control voltage source for any third-party devices, with the exception of what is shown on the wiring

diagram provided with the unit.

• Chilled water control: the chilled water valve and actuator are controlled and provided by others.

• Sensors: sensors and accessories not shown on the wiring diagram provided with the unit are provided by others.

• Damper control: The unit’s 100% outside air damper is factory-provided with a 24V actuator that is wired to the

blower with an end switch interlock. Damper actuation is started from the Unit Enable/Supply Fan Command

point (refer to Table 2).

• Supply fan control: the supply fan is started from the Unit Enable/Supply Fan Command point (refer to Table

2). Fan speed operates in response to the Supply Fan Speed Command point. The fan is not permitted to operate

until the unit’s 100% outside air damper is proven via a factory-wired damper interlock.

NOTE: ALL DIMENSIONS ARE IN INCHES. EXTERNAL PIPING CONNECTIONS (1-1/2 OD)

FRONT VIEW

I-YWMA (08-20) 1027886-0

OPERATION—CONTINUED

Unit Control—Continued

• Gas heat control: The unit’s modulating heat section requires a dry contact closure via the Heating Stage 1

Command point (refer to Table 2) and a minimum of 4V applied to the Gas Heating Modulation Command point

(refer to Table 2) until the Gas Heater 1 Status point (refer to Table 2) proves ignition. The two-stage ﬁxed capacity

heat exchanger requires dry contact closures for Heating Stage 2 Command and Heating Stage 3 Command.

Unit Testing and Adjustment

Test and adjust unit operation as follows:

1. Set main disconnect switch to OFF to deenergize unit.

2. Open and secure damper and supply fan access panels.

3. Set main disconnect switch to ON to energize unit.

4. Close contact for Unit Enable/Supply Fan Command (refer to Table 2).

NOTE: The damper actuators have up to a 120-second time period for full stroke.

5. Visually observe optional dampers to ensure that they are positioned properly. Outside air dampers should actuate

to full open position and return air dampers should actuate to full closed position.

6. When damper position is proven, close damper access panel.

7. Visually observe supply fan rotation in supply fan compartment. If fan is not rotating in same direction as that

shown on decal in compartment, correct rotation as follows:

a. Set main disconnect switch to OFF to deenergize unit.

b. Correct unit’s electrical phasing at main unit disconnect switch.

c. Set main disconnect switch to ON to energize unit and recheck supply fan rotation.

8. When supply fan rotation is proven, close supply fan access panel.

9. Set supply fan speed as follows:

a. Using two ﬁeld-supplied tees, connect manometer to appropriate set (blue and clear) of pressure tap tubes.

b. Using manometer, measure actual fan differential pressure.

c. Adjust third-party signal to Supply Fan Speed Command point (refer to Table 2) until differential pressure is

in accordance with Table 3. Record commanded value required for desired airﬂow and use as maximum fan

speed limit for variable volume fan control or as speed setpoint for constant volume control.

NOTE: All units are equipped with a gas control system (option AG74).

10. Check and adjust manifold pressure in accordance with information applicable to option AG74 in section titled

Gas Heat Section in Installation/Operation manual listed in Table 1. Refer to Table 2 for Carel controller display

ﬁelds that correspond to control connection points used on this unit.

Table 2. Control Connection Points for Customer Use*

Connection Type Connection Point

Carel Controller

Equivalent**

Signal Type Signal Range

Input

Supply Fan Speed Command —

0–10 VDC 0–100% speed

Gas Heating Modulation Command Heat Capacity

2–10 VDC 0–100% capacity

Unit Enable/Supply Fan Command —

Dry contact

—***

Heating Stage 1 Command Stg 1

Heating Stage 2 Command Stg 2

Heating Stage 3 Command Stg 3

Output

Gas Heater 1 Status

—

Gas Heater 2 Status

*For speciﬁc wiring termination details, refer to the wiring diagram provided with the unit.

**Heat command ﬁeld on Carel controller display screen used in Y series installation manual D300530 I-Y (PN 273646, refer to Table 1).

***Refer to the wiring diagram provided with the unit.

I-YWMA (08-20) 1027886-0

Table 3. Fan Pressure Drop and Airﬂow

Supply Fan

Static

Pressure

(IN WC)*

Cabinet Size

Static

Pressure

(IN WC)*

Cabinet Size

1A 1B 2 3 1A 1B 2 3

Airﬂow (cfm) Airﬂow (cfm)

0.5 — — 2630 — 6.6 1538 — 5437 6501

0.6 — — 2685 — 6.8 1563 — 5511 6598

0.7 — — 2739 — 7.0 1588 — 5584 6694

0.8 — — 2793 — 7.2 1612 — 5655 6788

0.9 — — 2847 — 7.4 1636 — 5725 6882

1.0 773 2084 2901 3038 7.6 1660 — 5794 6974

1.2 803 2191 3007 3193 7.8 1683 — 5862 7065

1.4 833 2298 3112 3345 8.0 1707 — 5929 7155

1.6 862 2403 3216 3495 8.2 1730 — 5997 7245

1.8 891 2507 3319 3642 8.4 1753 — 6064 7333

2.0 920 2611 3421 3786 8.6 1776 — 6132 7420

2.2 949 2714 3521 3927 8.8 1799 — 6199 7507

2.4 978 2816 3620 4067 9.0 1821 — 6267 7592

2.6 1007 2917 3718 4203 9.2 — — — 7677

2.8 1035 3018 3815 4338 9.4 — — — 7762

3.0 1063 3117 3911 4470 9.6 — — — 7846

3.2 1091 3216 4006 4599 9.8 — — — 7929

3.4 1119 3314 4099 4727 10.0 — — — 8011

3.6 1146 3411 4192 4852 10.2 — — — 8094

3.8 1174 3507 4283 4975 10.4 — — — 8175

4.0 1201 3603 4373 5096 10.6 — — — 8257

4.2 1228 3698 4462 5215 10.8 — — — 8338

4.4 1255 3791 4550 5331 11.0 — — — 8419

4.6 1282 3884 4636 5446 11.2 — — — 8500

4.8 1308 3977 4721 5559 11.4 — — — 8581

5.0 1335 4068 4806 5671 11.6 — — — 8661

5.2 1361 4159 4889 5780 11.8 — — — 8742

5.4 1387 4248 4971 5888 12.0 — — — 8822

5.6 1412 4337 5051 5994 12.2 — — — 8903

5.8 1438 4425 5131 6098 12.4 — — — 8984

6.0 1463 4513 5209 6201 12.6 — — — 9064

6.2 1489 — 5286 6303 12.8 — — — 9146

6.4 1514 — 5363 6402 13.0 — — — 9227

Power Exhaust (PE4) Fan

Static

Pressure

(IN WC)*

Cabinet Size

Static

Pressure

(IN WC)*

Cabinet Size

1A 1B 2 3 1A 1B 2 3

Airﬂow (cfm) Airﬂow (cfm)

0.2 782 782 782 782 3.0 3028 3028 3028 3028

0.4 1106 1106 1106 1106 3.2 3128 3128 3128 3128

0.6 1354 1354 1354 1354 3.4 3224 3224 3224 3224

0.8 1564 1564 1564 1564 3.6 3317 3317 3317 3317

1.0 1748 1748 1748 1748 3.8 3408 3408 3408 3408

1.2 1915 1915 1915 1915 4.0 3497 3497 3497 3497

1.4 2069 2069 2069 2069 4.2 3583 3583 3583 3583

1.6 2212 2212 2212 2212 4.4 3667 3667 3667 3667

1.8 2346 2346 2346 2346 4.6 3750 3750 3750 3750

2.0 2473 2473 2473 2473 4.8 3831 3831 3831 3831

2.2 2593 2593 2593 2593 5.0 3910 3910 3910 3910

2.4 2709 2709 2709 2709 5.2 3987 3987 3987 3987

2.6 2819 2819 2819 2819 5.4 4063 4063 4063 4063

2.8 2926 2926 2926 2926 5.6 4137 4137 4137 4137

5.8 4211 4211 4211 4211 7.0 4626 4626 4626 4626

6.0 4283 4283 4283 4283 7.2 4691 4691 4691 4691

6.2 4353 4353 4353 4353 7.4 4756 4756 4756 4756

6.4 4423 4423 4423 4423 7.6 4820 4820 4820 4820

6.6 4492 4492 4492 4492 7.8 4883 4883 4883 4883

6.8 4559 4559 4559 4559 8.0 4945 4945 4945 4945

I-YWMA (08-20) 1027886-0

OPERATION—CONTINUED

Unit Testing and Adjustment—Continued

—Continued

Table 3. Fan Pressure Drop and Airﬂow

Power Exhaust (PE5) Fan

Static

Pressure

(IN WC)*

Cabinet Size

Static

Pressure

(IN WC)*

Cabinet Size

2 3 2 3

Airﬂow (cfm) Airﬂow (cfm)

0.2 1447 1447 4.2 6633 6633

0.4 2047 2047 4.4 6789 6789

0.6 2507 2507 4.6 6941 6941

0.8 2895 2895 4.8 7091 7091

1.0 3236 3236 5.0 7237 7237

1.2 3545 3545 5.2 7380 7380

1.4 3829 3829 5.4 7521 7521

1.6 4094 4094 5.6 7659 7659

1.8 4342 4342 5.8 7794 7794

2.0 4577 4577 6.0 7928 7928

2.2 4800 4800 6.2 8059 8059

2.4 5014 5014 6.4 8188 8188

2.6 5219 5219 6.6 8314 8314

2.8 5416 5416 6.8 8439 8439

3.0 5606 5606 7.0 8563 8563

3.2 5789 5789 7.2 8684 8684

3.4 5968 5968 7.4 8804 8804

3.6 6141 6141 7.6 8922 8922

3.8 6309 6309 7.8 9039 9039

4.0 6473 6473 8.0 9154 9154

Power Exhaust (PE5) Fan

Static Pressure

(IN WC)*

Airﬂow

(cfm)

Static Pressure

(IN WC)*

Airﬂow

(cfm)

0.2 1447 4.2 6633

0.4 2047 4.4 6789

0.6 2507 4.6 6941

0.8 2895 4.8 7091

1.0 3236 5.0 7237

1.2 3545 5.2 7380

1.4 3829 5.4 7521

1.6 4094 5.6 7659

1.8 4342 5.8 7794

2.0 4577 6.0 7928

2.2 4800 6.2 8059

2.4 5014 6.4 8188

2.6 5219 6.6 8314

2.8 5416 6.8 8439

3.0 5606 7.0 8563

3.2 5789 7.2 8684

3.4 5968 7.4 8804

3.6 6141 7.6 8922

3.8 6309 7.8 9039

4.0 6473 8.0 9154

I-YWMA (08-20) 1027886-0

MAINTENANCE

Refer to any applicable information in the Maintenance/Service Procedures section in the Operation/Maintenance/

Service manual listed in Table 1.

TROUBLESHOOTING

Refer to any applicable information in the Troubleshooting section in the Operation/Maintenance/Service manual

listed in Table 1.

INSTALLATION RECORD

The installation record on the back page of the Installation/Operation manual listed in Table 1 is to be completed

by the installer.

Speciﬁcations and illustrations subject to change without notice or incurring obligations.

I-YWMA (08-20) 1027886-0

Reznor YWMA Installation guide

Reznor YWMA Installation guide

Reznor YWMA Installation guide

Related papers

Other documents