Aspen Manufacturing AEW Installation Manual

INSTALLATION GUIDE

AEW & AAW Series - Vertical Wall Mount Air Handler (Electric Heat)

1. Safety Instruction

Potential safety hazards are alerted using the following symbols. The symbol is used in conjunction with terms that indicate the intensity of the hazard.

WARNING

This symbol indicates a potentially hazardous situation, which if not avoided, could result in serious injury, property damage, product damage or death.

CAUTION

Certied technicians or those individuals

WARNING

and product damage or personal injury hazard may occur without such background.

WARNING

installer’s responsibility to ensure that product is installed in strict compliance with national and local codes. Manufacturer takes no responsibility for damage (personal, product or property) caused due to installations violating regulations. In absence of local/state codes, refer to National Electric Code: NFPA 90A & 90B Uniform Mechanical Code.

WARNING

(i.e. automobile, space heater, water heater etc.) ensure that the enclosed area is properly ventilated.

CAUTION

these instructions. Some localities may require a licensed installer/service personnel.

WARNING

damages caused due to modication of the unit to operate

with alternative power sources.

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meeting the requirements specied by

NATE may use this information. Property

All power sources should be disconnected prior to servicing. Failure to do so may cause personal injury or property dam-

age.

Product designed and manufactured to permit installation in accordance with local and national building codes. It is the

When this unit is installed in an enclosed area, such as a garage or utility room with any Carbon Monoxide producing devices

Only factory authorized kits and accessories should be used when installing or modifying this unit unless it is so noted in

Unit is not approved for outdoor installations.

The unit is designed for operation with 208/240 V, single phase, 60 Hz power supply. Aspen will not be responsible for

This symbol indicates a potentially hazardous situation, which if not avoided, may result in moderate injury or property damage.

2. Introduction

The AEW/AAW Series air handlers are versatile upow only models that can be recess mounted or ush mounted onto walls. These air

handlers have the following standard features:

I. Application Versatility

Front or bottom return air position. Offset hanging brackets attach to unit and wall to allow hanging inside closet.

Can be ARI matched with most brands of air conditioners or heat pumps for use with either R22 or R410a when proper metering device is used.

II. Motor

AEW models: Constant torque ECM speeds and torques are controlled by software embedded in the motor to maintain constant torque. Motors are pre-programmed at the factory. AAW models: Dual speed PSC motor.

III. Cabinet

Sturdy, short galvanized steel cabinet with painted front panels. Cabinet fully insulated with 1/2” faced insulation to prevent sweating and

mold growth, to encapsulate glass bers, and to provide excellent

R-value. Stick pins ensure insulation remains in place.

Units ship with disposable lter in lter rack.

IV. Modular Electric Heat Kits

Heat kits available with either circuit breakers or terminal blocks. Available in 3, 5, 8, & 10 KW. Models with electric heat include se-

quencers and temperature limit switches for safe, efcient operation. Modules are easily installed in the eld using molex plugs or can be

ordered factory-installed. Controls are accessible from the front for easy service.

Electrical connections can be made from the top or left. Disconnect does not protrude through the wall panel.

Fan time delay relay standard for increased efciency.

V. Blower

Direct drive multi-speed blowers circulate air quietly and efciently.

Motor speeds can be easily selected via motor terminals. Swing mounted blowers can be easily removed for service.

VI. Electronic Circuit Board

Electronic circuit board provides 30 sec. ON/OFF blower time delay

extracting more heat/cool from the coil

VII. DX Coil

High efciency ried copper tubes/enhanced aluminum ns provide maximum heat transfer. All coils immersion tested at 500 psi then nitrogen pressurized and factory sealed for maximum reliability. Coil

mounted Schrader allows pre-installation pressure testing.

Available with either check style owrater or TXV metering device. Field-installable TXVs are also available.

Galvanized metal drain pan with bottom primary and secondary drain connections or alternate right side primary. All connections 3/4” FPT. Access door allows for coil cleaning.

VIII. Warranty

Five year limited parts warranty.

3. Inspection

ü On receiving the product, visually inspect it for any major shipping related damages. Shipping damages are the carrier’s responsibility. Inspect the product labels to verify the model number and options are in accordance with your order. Manufacturer will not accept damage claims for incorrectly shipped product.

4. Installation Preparation

Read all the instructions in this guideline carefully while paying special attention to the WARNING and CAUTION alerts. If any of the

instructions are unclear; clarify with certied technicians. Gather all

the tools needed for successful installation of the unit prior to beginning the installation.

4A. Clearances

This unit is designed for zero clearance installation on three sides and adequate clearance to provide access for service in the front. A minimum of 2.5 – 3.5 feet clearance is recommended on the front end (Fig 4A-1).

4C. Condensate Drain Preparation

ü An auxiliary drain pan must be provided by the installer and placed

under the entire unit with a separate drain line that is properly sloped

and terminated in an area visible to the home owner. The auxiliary pans provide extra protection to the area under the unit should the primary and secondary drain plug up and overow. As expressed

in our product warranty; ASPEN WILL NOT BE BILLED FOR ANY STRUCTURAL DAMAGES CAUSE BY FAILURE TO FOLLOW THIS INSTALLATION REQUIREMENT. The drains from the auxil-

iary drain pan must be installed according to the local building codes.

4D. Condensate Drain

Drain lines from the auxiliary drain pan

CAUTION

The drain lines must be installed with ¼” per foot pitch to provide free drainage. A condensate trap MUST be installed on the primary drain line to ensure proper drainage of the condensate. The trap must be installed in the drain line below the bottom of the drain pan (Fig. 4C-1)

should NOT be connected to the primary drain line of the coil.

Fig 4A-1. Minimum Clearance for Air Handler

4B. Recess Mounting or Wall Mounting Option

These units are designed to be installed in a small room where they can be mounted above a water heater or recessed into a wall. The

unit should be installed in Vertical Upow position ONLY.

If installing the air handler into a recessed wall, the unit must leave clearance to allow the removal of the front panels. The bottom of the

unit should also rest on a sturdy platform or oor. The unit must be

level to allow condensate drainage.

These air handlers come with an offset mounting bracket that at-

taches the air handler to the wall when the unit is ush mounted to

the wall.

Fig 4C-1. Condensate Drain Trap

Since coil is upstream of the blower, all

CAUTION

from the drain pan. Aspen will NOT be responsible for any damages resulting from failure to follow these instructions.

CAUTION

DO NOT USE SOLVENT BASED PIPE DOPE. THIS WILL REDUCE THE LIFE OF THE PAN.

The drain pan has primary (white) and secondary (red) drain connections. If a secondary drain line is required, it should be run separately from the primary and should terminate in a highly visible location. Condensate disposal through the secondary drain line indicates that

drains MUST be trapped or sealed. Failure

to do so will result in condensate overow

If the drain pan is constructed of nylon

or plastic; use Teon tape to connect the

drain lines to the threads in the drain pan.

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the primary drain line is plugged and needs cleaning. If a secondary drain line will not be provided, plug the secondary drain. Drain plugs are NOT to be reused without plumbers tape or putty. Drain

line connection should be nger tightened, then turned no more than one complete turn as needed to ensure a rm connection. DO NOT

overtighten connection or damage may occur.

4E. Ductwork

Duct systems should be installed in accordance with standards for air-conditioning systems, National Fire Protection Association Pamphlet No. 90A or 90B. They should be sized in accordance with National Environmental System Contractors Association Manual K, or whichever is applicable.

On any job, non-ammable exible collars should be

used for the return air and discharge connections to prevent transmission of vibration (Fig 4E-1). Although these units have been specially designed for quiet vibration-free operation, air ducts can act as soundboards, can, if poorly installed, amplify the slightest vibration to the annoyance level.

All main supply and return air drops should be properly sized as determined by the designer of the duct system and should not nec-

essarily be the size of the duct ange openings of the unit. (The duct size should never be smaller than the ange openings of the air

handler supply and return air openings.) These models have a bottom or front return. Discard the drain ac-

cess panel in the bottom of the unit if this is a bottom return application (Fig 4E-2). In case of a front return application, the front access panel should be removed and discarded.

Fig 4E-2.

If an accessory grill is being used, the front access panel should be removed and discarded (Fig 4E-3).

Fig 4E-1.

A lter rack is provided for a 1”X20”X20” (AAW/AEW18/24/30/36/31/37) or 1”X14”X18” (AAW/AEW19/20/25/26) nominal size lter (Fig 4E-4). Inspect and clean or replace iter every month. A blocked lter can reduce air ow to the coil and hinder the performance of the system.

Fig 4E-4.

It is recommended that wherever supply and return air sheet metal ducts pass through unconditioned areas, they be insulated to pre-

vent excessive heat loss during heating operation. When applied in

conjunction with summer air conditioning, sheet metal duct routed through unconditioned areas should be insulated and have an outside vapor barrier to prevent formation of condensation.

5. Installation

Ensure that the unit is adequately sized.

CAUTION

WARNING

to installation. If holding pressure is not present, return coil to distributor for exchange.

CAUTION

present) are protected from heat during brazing and installation to prevent leakage. Use a core removal tool to temporarily remove the core when brazing. Replace the core once brazing is completed.

CAUTION

ü Clean coil ns with degreasing agent or mild detergent and rinse ns clean prior to installation.

The tonnage of the outdoor unit should never exceed the tonnage of this unit.

The coil was manufactured with a dry nitrogen pre-charge. Release the pressure through the Schrader valve test port prior

Some Aspen coils may include a Schrader valve on the suction manifold. Ensure that the Schrader valve and valve core (where

Insulation on the suction line MUST extend into the cabinet and continue as far as possible to eliminate condensate dripping onto the access door.

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Fig 4E-3.

ü The refrigerant line sizes should be selected according to the recommendations of the outdoor unit manufacturer.

ü Care must be taken to ensure all connection joints are burr-free and clean. Failure to do so may increase chances of a leak. It is recommended to use a pipe cutter to remove the spun closed end of the suction line.

ü To reduce air leakage, rubber gommets may be present where the lines pass through the coil case. To avoid damage, remove grommets prior to brazing by sliding over the lines. Use a quenching cloth or allow the lines to cool before reinstalling the grommets.

ü Use of wet rags/quenching cloth is highly recommended to prevent weld-related damages to the casing and Schrader valve (if present).

6. Mounting Air Handler To Wall

1. Install the air handler in a level position side to side and front to back. If this step is not followed, condensate water damage may oc-

cur. (Both ush mount and recess mount congurations.)

2. Determine where the air handler is to be placed on the wall. Place the hanging bracket on the wall and align the holes of the

bracket with the wall studs. Level

the hanging bracket and mark the holes to drill pilot holes for the screws.

3. Drill the pilot holes.

4. Secure the bracket with

screws sufcient to hold 4X the

weight of the air handler.

5. Position the air handler on the wall with the bracket on the air handler slightly higher than the bracket secured on the wall.

Lower the air handler so that the

brackets engage. Check the unit for level, both side to side and front to back.

CAUTION

ing to the capacity of the outdoor unit.

WARNING

Use Piston sizes recommended by the outdoor unit manufacturer whenever possible. The piston should be sized accord-

Failure to install the proper piston can lead to poor system performance and possible compressor damage.

I. Installation

Note: Photos are for basic illustration purposes only. Actual equip-

ment conguration may differ from that shown.

I-1. Disassemble owrator body

using two wrenches and unscrewing with a counterclockwise motion.

O-ring

I-2. Replace the Teon O-ring

(located between the halves). Discard Schrader if present.

7. Connecting Ducting

1. Secure supply air ducting to the top of the air handler. Canvas connectors are recommended for reducing potential noise transmission.

2. If the bottom return air opening is being used, remove the bottom panel. If a front return is being used, this panel will remain in place.

3. Secure the return air ducting to the air handler cabinet.

8. Metering Devices/Liquid Line Connection

Aspen coils are available with two kinds of metering devices a) owrator or b) TXV. The following instructions are separated into sec-

tions by metering device.

8A. Flowrator Coils

CAUTION

I-4. Braze the stub-out portion to the liquid line and let cool.

Be aware of the Teon O-ring. Be sure to

replace the O-ring to attain a proper

seal. (The Teon O-ring is located between the two halves of the owrator)

I-3. Slide the attachment nut onto the liquid line stub out.

O-ring

I-5. Taking care that the white

Teon seal is still in place inside the owrater body, rmly seat the

stub and screw the attachment

nut to owrater body.

Fig 7A-1. Flowrator assembly components

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I-6. Tighten the nut to a torque of approximately 10-30 ft-lbs. Do NOT overtighten the nut. Overtightening will impede the piston movement during operation.

II. Piston Replacement

Note: Photos are for basic illustration purposes only. Actual equip-

ment conguration may differ from that shown.

During some installations, a piston change may be required. If so, the installer MUST change the piston. Use piston sizes recommended by the outdoor unit manufacturer. If a sizing chart is not available, use the piston size chart provided below to size the required piston. The size of the

Fig 8A-2

Use the chart below when matching coil with an outdoor unit with a different nominal capacity than the coil.

piston is stamped on the piston body (Fig 8A-2).

II-6. Replace the piston with one of the correct size. Do not force the new piston into the body. Make sure the piston moves freely in body.

CAUTION

coil. Failure to ensure this orientation will cause the piston to be bypassed during operation which might damage the outdoor unit.

II-7. Assemble the two halves correctly and ensure that the white

Teon O-ring is present between the two halves (See I-5). Slide the 13/16” nut onto the distributor body.

Pay close attention to the piston orientation. The pointed end of the piston MUST go into the distributor body, towards the

II-1. Evacuate the system as per manufacturer guidelines and rec-

ommendations

II-2. Turn the 13/16” nut once to release any residual pressure in the

coil.

II-3. After ensuring that the coil is free of any residual pressure,

disassemble the owrator body

completely using two wrenches. Take great care not to distort the feeder tubes. The wrench used to clasp the nut should be turned in counter-clockwise direction to unscrew the nut.

II-4. Slide the 13/16” nut over

the lineset and separate the two

halves of the owrator.

CAUTION

II-8. Tighten the nut to a torque of approximately 10-30 ft-lbs. Do NOT overtighten the nut. Overtightening will impede the piston movement during operation.

II-9. If present, slide the rubber grommet back to position to prevent air leakage.

Be aware of the Teon O-ring. Be sure to

replace the O-ring to attain a proper

seal. (The Teon O-ring is located between the two halves of the owrator)

7B. TXV Coils

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II-5. Pull the piston out using a

small wire or pick. Verify the piston size (size is typically stamped on the body of the piston - Fig 8A-2). If a different piston size is required by the outdoor unit manufacturer, replace the piston using the small wire provided with the piston kit.

Fig 8B-1. Components of a typical TXV assembly

The sensing bulb and TXV body MUST be

WARNING

be covered using a quench cloth or wet cloth when brazing.

Pointing the brazing ame away from the valve and sensing

bulb provide partial protection only.

CAUTION

painted green for R22 or pink for R410A. In absence of color, the caps will be marked with the compatible refrigerant.

protected from overheating during brazing. The sensing bulb and TXV body must

Ensure that the TXV selected is compatible with the refrigerant used in the outdoor system (R22 or R410A). TXV caps are

The valves should be sized according to

CAUTION

formance and possible compressor damage.

the capacity of the outdoor unit. Failure to install the right valve can lead to poor per-

I. TXV Bulb Horizontal Mounting

The orientation and location of the TXV bulb has a major inuence

on the system performance.

Ensure that the TXV bulb is in direct con-

CAUTION

ed. Failure to do so will impair the proper functioning of the TXV valve.

It is recommended that the TXV bulb be installed parallel to the

ground (on a horizontal plane). The bulb position should be at

2 o’clock or 10 o’clock. Fig. 7B-2 shows the recommended position for the TXV bulb installation in the horizontal plane.

tact with the suction/vapor line. Gap between the bulb and tube should be avoid-

II. TXV Bulb Vertical Mounting

As recommended in Section

8B-I, the TXV sensing bulb

should be mounted in a horizontal plane in relation to the suction/vapor line. However, some installation congurations may require that the sensing bulb be mounted vertically. In this instance, place the bulb opposite the piping wall being hit by refrigerant and oil leaving the distributor tubes, and with capillary tubes directed upwards as shown in Fig. 8B-3.

Fig 8B-3. Recommended location

for vertical TXV bulb mount

If the TXV sensing bulb is mounted verti-

CAUTION

wall opposite to that being directly hit by the refrigerant and oil leaving the distributor tubes.

cally; the capillary MUST be directed upwards. The bulb must be mounted on the

Bulb position at

2 o’clock or

10 o’clock

Fig 7B-2. Recommended location for horizontal TXV bulb mount

The TXV sensing bulb SHOULD be mounted on the suction line approximately 6” from the TXV or coil housing using the metal clamp

provided. In order to obtain a good temperature reading and correct

superheat control, the TXV sensing bulb must conform to ALL of the

following criteria:

1. The sensing bulb MUST be in direct and continuous contact with the suction line.

2. The sensing bulb should be mounted horizontally on the suction line.

3. The sensing bulb MUST be mounted at the 2 o’clock or 10 o’clock position on the circumference of the suction line.

4. The sensing bulb MUST be insulated from outside air.

A properly mounted sensing bulb will prevent false readings caused by liquid refrigerant that may have formed inside the suction/vapor line. Insulation will protect the sensing bulb from false readings due to contact with warm air.

III. Field-Installed TXV Retrot

Note: Photos are for basic illustration purposes only. Actual equip-

ment conguration may differ from that shown.

When installing an expansion valve, it is not necessary to slide the

coil out of the housing.

III-1. Disassemble the owrator

body using two wrenches. Unscrew the body with a counterclockwise motion.

III-2. Remove the existing ow- rator piston using a small wire or pick.

III-3. Replace the Teon O-ring

seal in place (located between the halves).

O-ring

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III-4. Inspect the TXV box to conrm that the valve is compatible

with the refrigerant in the system.

Male

(Inlet)

Female (Outlet)

III-5. Remove the valve from

the box and note the location of the inlet side (threaded male port) and the outlet side (female swivel nut port).

III-6. After ensuring that the

Teon O-ring seal is still in place inside the owrator body, screw

the female swivel nut onto the

owrator body.

O-ring

III-7. Slide attachment the nut onto the liquid line stub out

(See 8A, I-3)

III-8. Braze the stub-out portion to the liquid line and let cool.

WARNING

Do not attempt to touch brazed joints while hot. Severe burns may result.

B. Screw are nut on TXV equal-

ization tube on to the Schrader valve stem.

III-12b. In some cases, a suction line schrader port may not be present. If a Schrader port is NOT present:

A. Install a eld-supplied braze-on schrader

valve like that shown on the suction line near the intended sensing bulb mounting location. Follow valve manufacturer instructions and recommendations for installation.

B. Attach equalizer tube to valve as described in section III-12a above.

III-13. Mount the sensing bulb as described in section 8B-I or 8B-II.

When handling or manipulating the equal-

CAUTION

izer tube, take great care not to kink or make extreme bends in the tubing.

O-ring

III-10. Tighten all connections taking care to use proper back up.

III-11. Remove the valve identication sticker from the valve and

place it adjacent to the Aspen model number on unit name plate.

III-12a. Some Aspen coils come with a Schrader valve on the suction line. If a Schrader port is present:

III-9. Remove the additional Tef-

lon O-ring seal from the box and

place on the shoulder just inside

the TXV inlet port. Screw the nut

attached to the stub-out portion of

the owrator body onto the inlet port of the TXV.

A. Remove the valve stem from the Schrader port mounted on the suction line.

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9. Connecting Refrigerant Lines

1. Release nitrogen holding charge by depressing the

Shrader Valve at the liquid line

connection on the air handler. If no gas releases from the air handler, contact distributor regarding potential leak.

2. Cut off Shrader Valve tting at

the liquid line connection. Use a tubing cutter for this step. Clean the burr from the cut tubing to reduce the chance of future leaks. Connect the liquid line to the tubing at the indoor unit.

7. Flow nitrogen through the piping when brazing.

8. Braze both refrigerant line connections using proper brazing procedures.

9. When all line connections are brazed, perform a proper system evacuation procedure per the outdoor unit manufacturer instructions.

10. Seal the penetration openings where the lineset piping enters the air handler cabinet.

10. Leak Check

1. Following outdoor unit manufacturer instructions and recommen-

dations, charge the system with dry nitrogen to a maximum pressure

of 150 PSIG.

3. Use a tubing cutter to remove the spun end from the suction line connection at the air handler. Clean the burr from the cut tubing to reduce the chance of future leaks.

4. To avoid heat damage to grommets where present, remove these prior to brazing by sliding them over the refrigerant lines and out of the way.

5. Check to determine if the evaporator coil has a Shrader

tting on the suction manifold.

If yes, remove the valve core to prevent heat damage during brazing. Replace the valve core once the piping has cooled.

2. Check all brazed and screwon line connections by applying a soap solution to the joint. A leak will produce bubbles in the soap solution.

3. If any leaks or are discovered, relieve system pressure and repair leaks. Repeat steps 1-3.

4. With no leaks or weak connections present, evacuate the system and charge as per the outdoor unit manufacturer instructions and

specications.

11. Electrical Line Voltage Wiring

These units are designed for single or three phase 208/240 volts, 60

HZ power supply. Wire selection and wiring must be in accordance with the National Electric Code and/or local codes. Unit terminals are designed to accommodate copper and aluminum wiring. If aluminum wiring is used: please observe special precautions relative to sizing, wire connections and corrosion protection.

All models with 5,8 or 10 kW electric heat are arranged for single circuit connections. Models larger than 10 kW are arranged for multicircuit protection. Refer to top part of wiring diagram at the end of this guide for detailed information.

6. If the air handler has a TXV

metering device, remove the sensing bulb from the suction line prior to brazing to prevent heat damage from occurring. Replace the sensing bulb once the piping has cooled.

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Line voltage wiring should be

routed through the access holes at the top of the air handler. Proper electrical conduit con-

nection ttings should be used.

Connect the power wiring to the line side connections on the air handler. The electrical ground wire should be connected to the grounding lug. Ensure both the

eld supplied ground wire and

air handler GREEN ground wire are both secured to the grounding lug of the air handler.

240VAC

Tap

208VAC

Tap

If the line voltage being supplied to the air handler is 208 volt single phase, the line voltage tap on the low voltage transformer needs to be moved from the 240 volt tap to the 208 volt tap. If this is not done, the secondary output voltage of the transformer will be too low.

12. Low Voltage Connections

12A. Single Stage Cooling with Electric Heat

The air handler comes factory setup for a single stage cooling system. If factory installed accessory electric heaters are preinstalled, the unit will also have a low voltage wire for the electric heat (Fig 12A-1).

Fig 12A-2.

12B. Two Stage Condensing Units

If the outdoor condensing unit is a two stage model, a eld provided Y2 wire can be connected to the motor using an electrical spade con-

nector. The number 4 and 5 terminal on the motor are speed taps that will increase the blower speed for second stage cooling opera-

tion. Both the G and Y2 terminals will be energized at the same time

during a call for second stage blower speed operation. The motor will

run at the speed where the Y2 wire is connected (Fig 12B-1).

Fig 12A-1.

During cooling mode operation, the indoor blower G wire will energize a time delay relay inside the air handler. After a short time delay period, the time delay relay will send out a 24 volt signal to the low

voltage terminal on the motor. Fan delay periods are 7 seconds ON delay and 65 seconds OFF delay. (See Schematic) The Y wire from the thermostat is not connected at the air handler.

This wire goes directly to the outdoor unit 24 volt wiring to turn on the outdoor condensing unit when a call for cooling takes place. The 24 volt common for the outdoor unit circuits is connected at the air handler Brown wire. The electric heater low voltage wiring W terminal is wired directly from the thermostat to the air handler. The blower will delay on a

heat call ON for a period of 5 seconds. The OFF delay period is 60

seconds.

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Fig 12B-1.

Operating CFM based upon each speed tap number is shown on the electrical wiring diagram of the unit. Final air volume adjustments

should be made by referencing total external static pressure (Table

12B-1, following page).

REVISIONS

ERN

ZONE

REV.

DESCRIPTION

DATE

CHECKED BY

TBD

INITIAL RELEASE

10/23/2017

Table 12B-1.

MODEL

SPEED

TAP

CFM V. EXTERNAL STATIC*

0.10 0.20 0.30 0.40 0.50

T1 909 864 840 800 782

T2 723 690 652 631 600

AEW 18/24

T3 600 565 539 502 480

T4 723 690 652 631 600

T5 909 864 840 800 782

T1 670 645 615 590 570

T2 800 780 750 730 695

AEW 19/25

T3 875 850 820 790 760

T4 980 955 930 900 875

T5 1065 1035 1015 995 970

655 630 605 580 560

T2 785 765 735 715 685

AEW 20/26

T3 860 835 805 775 745

T4 960 935 910 885 860

1045 1015 995 975 950

1365 1332 1303 1271 1240

T2 745 698 668 630 600

AEW 30/36

T3 898 873 853 827 800

T4 1174 1132 1106 1078 1047

1365 1332 1303 1271 1240

745 715 675 640 615

T2 940 910 875 840 805

AEW 31/37

T3 1100 1070 1025 995 965

T4 1220 1180 1155 1115 1085

1385 1350 1330 1290 1270

13. Condensate Drain

1. Condensate drain is located at front as shown in picture with primary and secondary drain port.

2. Pipe condensate system using proper PVC ttings.

14. Air Volume Adjustment

Air volume needs to be set to the level recommended by the outdoor unit equipment manufacturer. Most systems will require around 400 CFM of indoor air for every 1 ton of system cooling capacity. The air volume must be set prior to attempting system charge.

This air handler uses a constant torque ECM Motor. This motor will try to maintain proper motor torque to achieve programmed air

volume levels at varying levels of external static pressure. The air volume level produced by the air handlers at varying external static

pressure levels is shown in Table 12B-1.

Use a Magnehelic Gauge with a 1” scale and two static pressure tips to measure the static pressure during the air volume adjustment procedure (Fig. 14-1). The high port static pressure tip should be placed in the supply duct near the outlet of the air handler. The low port static pressure tip should be placed in the return air duct near

the entrance to the air handler. The factory provided air lter should

be in place inside of the air handler.

Fig. 14-1

1. Select a starting speed tap from the CFM table.

The blower motor has selectable speed taps labeled 1 thru 5 (Fig. 14-2). The speed taps are energized by 24 volts received from the time delay relay. When two stage cooling units are used, both the

rst and second stage fan speed taps will be energized at the same

time. The motor will run at the speed generated at the highest motor speed tap.

SECONDARY

DRAINPORT

PRIMARY

3. Ensure a minimum 2” trap is installed in the condensate

drain. Locate the trap near to

the connection opening on the air handler. See illustration.

Fig. 14-2

2. Call for fan only operation at the thermostat.

3. Read the external static pressure level on the Magnehelic gauge.

4. Make speed tap selection changes to get the air volume as close

as possible to the required level. (Table 14-1)

5. If the static pressure is above .5” wc , excessive turbulence or duct

friction needs to be reduced. (Obstructions in the duct system can

also cause excessive static pressure.)

6. When proper air volume is established, move on to the charging procedure.

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MODEL

AAW 18/24

AAW 19/25

AAW 20/26

AAW 30/36

AAW 31/37

Table 14-1.

MOTOR

SPEED

LOW 834 795 746 687 620

HIGH 930 888 823 749 680

LOW 740 710 685 650 615

HIGH 930 880 830 770 710

LOW 727 696 674 640 604

HIGH 909 866 814 757 696

LOW 1123 1094 1062 1034 1000

HIGH 1396 1358 1313 1261 1200

LOW 1154 1100 1042 982 901

HIGH 1256 1193 111 3 1057 982

CFM V. EXTERNAL STATIC*

0.10 0.20 0.30 0.40 0.50

15B . Expansion Valve Coils

Add refrigerant until the subcooling measured at the outdoor unit liquid line matches the subcooling recommendation of the outdoor manufacturer. If chart is unavailable charge the unit to a subcooling value of 8ºF +/- 1ºF.

16. Adjustment Of Heat Anticipator

After all connections are made, start-up and checkout must be performed before proper evaluation of the entire system can be made. Make sure that heat anticipator is properly set as noted on thermo-

stat instructions. Load requirements can vary in each residence and

it may be necessary for the installer or homeowner to make slight adjustments to the heat anticipator setting for longer or shorter cycles. It is recommended to change the setting no more than plus or minus

0.05 amps at a time. Greater changes can cause the unit to rapid

cycle or remain on excessively. Measure anticipator circuit current

with electric heaters energized and set anticipator to proper level.

15. System Charging

An improperly charged system may cause

CAUTION

of the coil, refer to the outdoor unit manufacturer for charging techniques and amount of charge. If outdoor unit manufacturers charging instructions are unavailable; then refer to instructions below to charge the system.

1. Bring airow up to the maximum CFM possible according to Table

14-1.

2. Evacuate refrigeration system to micron level required by outdoor unit manufacturer.

3. Release system charge from outdoor unit and call for cooling.

4. Use outdoor unit equipment manufacturer specic charging charts

if available and make proper charge adjustment based upon outdoor unit instructions.

5. If outdoor unit instructions and charts are not available, use Aspen provided charts. Make certain indoor air temperature is near comfort

level setpoint 75F, prior to establishing superheat and subcooling

levels.

15A . Flowrator Coils

Add refrigerant until the superheat measured at the outdoor unit suction/vapor line matches the superheat from the chart below.

degradation in system performance and damage the compressor. After installation

17. Final System Checkout

1. Make certain all cabinet openings are properly sealed and any grommets moved during installation are moved into proper place.

2. With cooling system operating, check for condensate leakage.

3. Perform leak detection inspection of refrigerant circuit and con-

necting piping.

4. Secure all cabinet doors

Outdoor

Temp

°F D.B. Min Nom Max

65 30 35 40

70 26 30 34

75 21 25 29

80 17 20 23

85 12 15 18

90 8 10 12

100

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4 5 7

Table 15A-1.

Superheat

18. Wiring diagram for AEW models

Fig 18-1.

HIGH VOLTAGE disconnect all power sources prior to servicing. Failure might lead to safety hazard

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19. Wiring diagram for AAW models

NOTES :

HTR 6

- FEMALE SOCKET

BTD

LO SPEED

WIRING CODE

FACTORY HIGH VOLT

COLOR CODE

- WHITE

- BLACK

WBKBLRBK/WGNGRBRGN/BK

COM

(CAPPED)

MED SPEED

(CAPPED)

FACTORY LOW VOLT

- BLUE

SEE NOTE 3

FIELD LOW VOLT

FIELD HIGH VOLT

- RED

- BLACK/WHITE STRIPE

- GREEN

TRANSFORMER

- GRAY

- BROWN

- GREEN/BLACK STRIPE

- GREEN/RED STRIPE

GN/RD

24 VOLTS

5 4

BTD

- LIMIT CONTROL

- HEAT SEQUENCER

- HEATER

- MALE PLUG

LCHSHTR

- BLOWER TIME DELAY

- CIRQUIT BREAKER

- BLOWER MOTOR

OR TERMINAL 2 FOR 208 VOLT OPERATION.

MOTOR LEAD. RD - LOW , BL - MED, BK - HI

2. RED WIRE TO BE ON TERMINAL 1 FOR 230 VOLT

3. TWO SPEED CONNECTION OPTIONAL. [KIT REQUIRED]

1. LINE SPLICE TO BE ATTACHED TO UN USED

HTR 5

HTR 4

HTR 3

BTDCBBMFCFS

LEGEND

HTR 2

- FAN CAPACITOR

HTR 1

DIAGRAM # 101126

CURRENT 08/17/18

BK/W

GNBR

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HIGH VOLTAGE disconnect all power sources prior to servicing. Failure might lead to safety hazard

Fig 19-1.

373 Atascocita Rd. Humble, TX 77396 Phone: 281.441.6500 Toll Free: 800.423.9007 Fax: 281.441.6510

www.aspenmfg.com

Revised 10/17/18. Subject to change without notice and without incurring obligation.

# 123106

Aspen Manufacturing AEW Installation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual