Dettson X40160G-AHV Air Handler Owner’s Manual

Dettson X40160G-AHV Air Handler

Product Information

The product is a Duotec Air Handler (model AHV) that can be used for cooling or heat pump applications. It features a 115/208/230V ECM variable-speed blower motor and an electronic fan control board. The cabinet can be installed in an up flow, downflow, or horizontal position.

Product Usage Instructions

1. Safety Considerations:

   • Before attempting installation, read and understand the entire manual.
   •  In Canada, refer to the current editions of the Canadian Electrical Code CSA C22.1 for safety information.

2. Clearances:

   • For installations without heaters:
   • All sides should have zero clearance.
   • The supply duct should have zero clearance. – Recommended service clearance from the front is 20 inches (508mm) for blower and filter access (if installed). –
   • For installations with heaters:
   • All sides should have zero clearance.
   • The first three feet of the supply duct to combustibles should have a clearance of 1 inch (25mm).
   • The duct after three feet should have zero clearance.
   • Recommended service clearance from the front is 20 inches (508mm) for blower and heater access.

3. Fire Hazard:

4. Maintain clearances from combustible materials as specified on the unit rating plate when heaters are installed.

5. Do not use plastic lined or combustible flexible ducting within 36 inches (914mm) of the supply end of the modular unit.

6. General Information:
   If the unit is located in an area of high humidity, nuisance sweating of the casing may occur. Use a wrap of 2 inches (51mm) fiberglass insulation with a vapor barrier on these installations.

7. Installation:

   • The unit can be installed in an up flow, downflow, or horizontal position. Refer to Figure 3 and 4 in the manual for guidance.
   • Select a location that provides adequate structural support, space for service access, clearance for return air and supply duct connections, space for refrigerant piping connections, and condensate drain line connections.
   • If heaters are being installed, maintain adequate clearance from the supply ductwork as specified in the Clearances section and follow the warning provided.

Note: Installation must conform to local building codes and the National Electrical Code NFPA70 current edition. The manual is intended for use by a qualified service technician familiar with safety procedures and equipped with the proper tools and test instruments.

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock, or other conditions which may cause death, personal injury, or property damage. Consult a qualified installer, service agency, or your distributor or branch for information or assistance. The qualified installer or agency must use factory-authorized kits or accessories when modifying this product. Refer to the individual instructions packaged with the kits or accessories when installing. Follow all safety codes. Wear safety glasses, protective clothing, and work gloves. Use quenching cloth for brazing operations. Have fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions included in literature and attached to the unit. Consult local building codes, the current editions of the National Electrical Code (NEC) NFPA-70. In Canada refer to the current editions of the Canadian Electrical Code CSA C22.1 Recognize safety information. This is the safety-alert symbol . When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury. Understand these signal words; DANGER, WARNING, and CAUTION. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies hazards which could result in personal injury or death. CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability or operation.

ELECTRICAL SHOCK HAZARD

Failure to turn off electric power could result in personal injury or death.

Before installing or servicing system, turn off main power to the system. There may be more than one disconnect switch, including accessory heater(s).

Figure 1

|

Nominal Installation Dimensions and Clearances – in(mm)

---|---

Fire Hazard

Failure to follow this warning could result in personal injury, death, and/or property damage.

When heaters are installed maintain clearances from combustible materials as specified on unit rating plate. Do not use plastic lined or combustible flexible ducting within 36” (914 mm) of the supply end of the modular unit.

CLEARANCES

NO HEATERS

All Sides…0″

From Supply Duct…0″

Recommended Service From Front…20″(508 mm) (Service for blower, filter if installed)

WITH HEATERS

All Sides…0″

From First Three Feet of Supply Duct to Combustibles…1″ (25mm)

From Duct after Three Feet…0″

Recommended Service From Front…20″ (508mm) (Service for blower, heaters if installed)

GENERAL INFORMATION

WARNING

DEATH, PERSONAL INJURY, AND/OR PROPERTY DAMAGE HAZARD

Failure to carefully read and follow this warning could result in equipment malfunction, property damage, personal injury and/or death.The information contained in this manual is intended for use by a qualified service technician familiar with safety procedures and equipped with the proper tools and test instruments.

Installation must conform with local building codes and with the National Electrical Code NFPA70 current edition.

INTRODUCTION
The AHV air handler cabinet uses a 115/208/230V ECM variable-speed blower motor, with an electronic fan control board. The AHV may be used for cooling or heat pump applications either with or without electric heat. The cabinet can be installed in an up flow, downflow or horizontal position. Refer to Figure 3 and 4.
LOCATION
Select the best position which suits the installation site conditions.
The location should provide adequate structural support, space in the front of the unit for service access, clearance for return air and supply duct connections, space for refrigerant piping connections and condensate drain line connections. If heaters are being installed, make sure adequate clearance is maintained from supply ductwork; See Clearances and Warning in Figure 1.

If the unit is located in an area of high humidity, nuisance sweating of casing may occur. On these installations a wrap of 2” (51mm) fiberglass insulation with a vapor barrier should be used.

HEATER PACKAGES
Factory approved, field installed, UL listed heater packages are available from the equipment supplier. See unit rating plate for a list of factory approved heaters (electric heat accessory models EHIA only). Heaters that are not factory approved could cause damage which would not be covered under the equipment warranty.

CAUTION

CUT HAZARD

Failure to follow this caution may result in personal injury.

Sheet metal parts may have sharp edges or burrs. Use care and wear appropriate protective clothing and gloves when

handling parts.

INSTALLATION

The unit is ready to install in any position without modifications. Refer to the coil instructions for information on drain pan configurations etc. Make sure coil is set up properly for desired position of blower cabinet.
Coil must be secured to blower cabinet with the three tabs that are part of the blower cabinet base. Bend the tabs out from the bottom so they fit over the coil cabinet.

Position coil cabinet in relation to the blower so they will be correct for desired application.
For up flow and horizontal applications apply foam seal strip around top of coil cabinet. For downflow application apply foam seal strip around bottom of coil cabinet. Set blower on top of coil cabinet so they are flush. Secure cabinets together using the three tabs on the bottom of the cabinet. Bend the tab out from the bottom so it fits over the coil cabinet. If no pilot holes are present, drill a hole as required for a screw.

DOWNFLOW INSTALLATION
Refer to instructions with the downflow base Accessory Kit, part# DFB08-AH, DFB12-AH, DBF16-AH or DBF20-AH.

NON-DUCTED RETURN AIR CLOSET INSTALLATION
The cabinet can be installed in a closet with a false bottom to form a return air plenum or mounted on an open platform inside the closet. Platform should be high enough to provide a free (open) area for adequate return airflow into the bottom of the cabinet. The open area can be on the front side or a combination of front and sides, providing there is clearance on the sides between cabinet and closet. Refer to ACCA Manual D for sizing and free area recommendations. NOTE: Local codes may limit application of systems without a ducted return to single story dwellings.

HORIZONTAL LEFT AND RIGHT INSTALLATIONS
The air handler cabinets can be installed in either downflow, horizontal left or horizontal right applications. When a coil cabinet is applied, refer to the coil installation manual for proper drain pan and airflow requirements. They must have the drain pan repositioned for right hand airflow. Refer to coil installation manual.

CAUTION

• PROPERTY DAMAGE HAZARD
• Failure to follow this caution may result in property damage.
• A field fabricated auxiliary drain pan, with a separate drain is REQUIRED for all installations over a finished living space or in any area that may be damaged by overflow from a restricted main drain pan. In some localities, local codes require an auxiliary drain pan for ANY horizontal installation.

SUSPENDED CABINET INSTALLATION

1. The cabinet may be supported on a frame or shelf, or it may be suspended.
2. Use metal strapping or threaded rod with angle iron supports under the auxiliary drain pan to suspend cabinet. These supports MUST run parallel with the length of the cabinet. Refer to Figure 5.
3. Ensure that there is adequate room to remove service and access panels after installing supporting brackets.
4. Place field installed vibration isolators in auxiliary drain pan to support cabinet.

DUCT CONNECTIONS SUPPLY DUCT
Supply duct must be attached to the outside of flange on outlet end of unit. Flexible connectors may be used if desired.
Seal all ducts and transitions carefully. Especially for high static pressure duct system.
Maintain clearances from supply duct to combustibles when heaters are installed. Refer to Figure 1 and unit rating plate.

RETURN DUCT
Return duct should be attached to bottom of unit using sheet metal screws or other fasteners.

FILTER INSTALLATION
Filters must be field supplied. A remote filter grille or other means must be provided. Refer to ACCA Manual D for remote filter sizing.

NOTE: If increased structural strength is needed in the horizontal position, use field supplied two connecting plates in place of the tabs on the bottom of the blower.

ELECTRICAL CONNECTIONS
The AHV air handler utilizes an electronic fan control board which has a low voltage circuit protective fuse (5 AMP), and pigtail connections for thermostat hook up. The fan control also has a relay for blower operation and built in 90 second blower-off time delay relay (TDR). To disable the TDR feature, snip the jumper wire JW1. Refer to Figure 6
All electrical work MUST conform with the requirements of local codes and ordinances and the National Electrical Code NFPA 70 current edition.
The low voltage transformer and the fan control are standard on all models and are prewired at the factory for 240V.

WARNING

• ELECTRICAL SHOCK or UNIT DAMAGE HAZARD
• Failure to follow this warning could result in personal injury, death, and/or property damage.
• Turn OFF electric power at fuse box or service panel before making any electrical connections and ensure a proper ground connection is made before connecting line voltage.

CONVERT TO 115V ELECTRICAL SUPPLY
This unit is pre-wired for 240V at the factory. To use 115V power supply, two easy steps are required:

1. Gently remove the black wire from the 240V tab of the transformer and reconnect to the 115V tab. Make sure the connection is tight.
2. Gently remove the 5-pins connector from the motor and install a jumper as shown here. A red wire is provided in the manual pouch. See the electrical diagram.

CAUTION

• UNIT DAMAGE HAZARD
• Do not install the jumper with 208/240V supply voltage. Failure to follow this warning WILL result in motor failure. THIS WILL VOID THE WARRANTY.

OVERCURRENT PROTECTION
The power supply wiring to the unit MUST be provided with overcurrent protection. Governing codes may require this to be fuses ONLY or circuit breakers.
For blower cabinets without heaters, a 15 amp or 20 amp circuit may be used.
Before proceeding with electrical connections, make certain that supply voltage, frequency, phase, and circuit ampacity are as specified on the unit rating plate. See unit wiring label for proper field high and low voltage wiring. Make all electrical connections in accordance with the NEC and any local codes or ordinances that may apply. Use copper wire only. The unit must have a separate branch electric circuit with a field-supplied disconnect switch located within sight from and readily accessible from the unit.
NOTE: When a pull-out type disconnect is removed from the unit, only the Load side of the circuit is de-energized. The Line side remains live until the main (remote) disconnect is turned off.

WARNING

• ELECTRICAL SHOCK or UNIT DAMAGE HAZARD
• Failure to follow this warning could result in personal injury, death, and/or property damage.
• If a disconnect switch is to be mounted on unit, select a location where drill and fasteners will not contact electrical or refrigeration components.

NOTE: Transformer is factory-wired for 230V operation. For 208V applications the transformer must be rewired to the 208V tap. Refer to unit wiring label and diagram.

GROUNDING CONNECTION
Use a copper conductor(s) from the ground lug on the No Heat Kit or ground lugs on the electric heater to a grounded connection in the electric service panel or a properly installed grounding rod.

LOW VOLTAGE CONTROL CONNECTIONS
Wire low-voltage in accordance with wiring label on the blower (also refer to Figures 8 – 15. Use 18 AWG color-coded, insulated (35°C minimum) wire to make the low-voltage connections between: thermostat, indoor equipment, and outdoor equipment. If thermostat is located more than 100 feet (31m) from the unit (as measured along the low voltage wire), use 16 AWG color-coded, insulated (35°C minimum) wire. All wiring must be NEC Class 1 and must be separated from incoming power leads. Refer to outdoor unit wiring instructions for additional wiring recommendations.

Field supplied low-voltage wiring should be field connected inside control splice box area (secure with wire nuts), and strain relief bushing or rubber grommet to seal cabinet opening.
Fan control board is circuited for single−stage heater operation. When additional heater staging is desired (using indoor wall thermostat or ODTS), remove the Jumper J2 on fan control board to enable staging.

THERMOSTAT FIELD CONNECTIONS

• Dh is used if additional latent capacity control is required (see Dehumidification Capability in the Accessories section for more detail).
• R R signal is 24V hot to thermostat
• W1 W1 signal controls electric heat from the thermostat
• W2 W2 signal from a two-stage thermostat or outdoor thermostat
• Y1 Connection for the low-speed compressor operation
• Y/Y2 Connection for the Y signal or high speed (Y2) signal from the thermostat
• G Connection for the G (fan) signal is energized from the thermostat, ’HUM2’ and AUX2’ terminals are energized when G energized
• O Connection for the ’O’ signal from the thermostat
• C Connection for the C terminal to the thermostat (24V common) also common to SEC1, HUM1, AUX1

 | Table 1: electrical data without electric heater|  |
---|---|---|---
 | AHV08 & AHV12 – 1/2 HP MOTOR| AHV16 & AHV20 – 3/4 HP MOTOR| Recommended *
Voltage| Motor FLA| MCA| MOP| Motor FLA| MCA| MOP| Wire Size| Ground Size
120| 5.2| 6.5| 15| 7.6| 9.5| 20| 14| 14
208| 3.0| 3.8| 15| 4.4| 5.5| 15| 14| 14
240| 2.6| 3.3| 15| 3.8| 4.8| 15| 14| 14

• Must conform to local building codes and national standards USA: National Electronic Code (NEC) ANS/NFPA 70

CANADA: Canada Electric Code CSA C22.1

BLOWER MOTOR – CFM

FAN CONTROL BOARD CONFIGURATION
The Fan Control Board can be configured by the installer and should be operated within its specified CFM range (refer to Table 2). The ECM motor uses wire selection taps (A through F) to modify operation determined from a pre- programmed airflow table (refer to Figure 6 for wire selection and tap identification, and Tables 4 and 7 for airflows). Airflows are based on system size and/or mode of operation. These airflows are automatically modified as needed in response to other inputs such as the need for dehumidification, etc.

24
30
36
AHV12| 24| 415 – 1600| 196-755
30
36
42
AHV16| 36| 540 – 2000| 255-944
42
48
60
AHV20| 36| 540 – 2000| 255-944
42
48
60

The AHV unit must be configured to operate properly with all the system components that have been installed. To successfully configure a basic system, move the wire selection tap (as needed) to the proper pin position.
NOTE: The factory default setting for all selections is the first pin. It is recommended the installer review each setting (see below and refer to Figure 6 for wire selection and tap identification).

AUXILIARY HEAT KW/CFM (VIOLET WIRE)
Select the CFM range based on the electric heater kW size by using the Violet wire.
If no heater is installed, this step can be skipped. However, when an electric heater is applied, move the Violet wire to the proper A, B, C, D pin selection. Refer to Table 8 for heater range selection. The heater kW ranges correspond directly to each pin letter listed in the table.
The airflow must be greater than the minimum CFM for electric heater application with the size system installed for safe and continuous operation. (Refer to Tables 4 and 5 for airflow).
NOTE: Airflow marked is the airflow which will be supplied in emergency heat mode and heating mode on air conditioners when electric heat is the primary heating source.
In heat pump heating mode when electric heaters are energized, the ECM motor will run the higher or heat pump heating airflow and electric heater airflow to ensure safe heater operation. The factory selection is the largest heater range approved.

OUTDOOR UNIT SIZE (BLUE WIRE)
Select the outdoor unit system size (BTU) by using the Blue wire (refer to Table 9). The installer needs to properly select the outdoor unit size to ensure proper airflow delivery of the modular unit. This selection affects all operational modes (airflow) except for electric heat modes.
Move the Blue wire to the proper A, B, C, D pin selection. The outdoor unit size corresponding directly to each pin letter is listed in Table 7.

SYSTEM TYPE – AC/HP (ORANGE WIRE)
Select the system type (AC, HP-Comfort, HP-Efficiency) by using the Orange wire.

• AC – Air Conditioner selection provides approximately 400 CFM per ton for greater efficiency and humidity control with the AC/HP CFM ADJUST set to the nominal (NOM) tap. (To achieve approximately 460 CFM per ton move tap to (HI) position. Refer to appropriate airflow tables for exact CFM setting.)
• HP-COMFORT – Heat Pump Comfort selection provides approximately 350 CFM per ton for higher than normal heating air delivery temperature. Provides approximately 350 CFM per ton cooling airflow for good humidity removal with the AC/HP CFM ADJUST set to the nominal (NOM) tap.
• HP-EFF – Heat Pump Efficiency selection provides same airflow for heating and cooling modes to increase overall HP efficiency; approximately 400 CFM per ton with the AC/HP CFM ADJUST set to the nominal (NOM) tap.

AC/HP CFM ADJUST
Select the system AC/HP CFM Adjust by using the Black wire. This selection basically selects; Medium, Low, or High Airflow

•  NOM – provides airflow at rates described above, the AC/HP ADJUST select is factory set to the nominal (NOM) tap. The adjust selections HI/LO will regulate airflow supplied for all operational modes, except non-heat pump heating modes.
• HI – provides 15% airflow over nominal unit size selected.
• LO – provides 10% airflow below nominal unit size selected. Adjust selection options are provided to adjust airflow supplied to meet individual installation needs for such things as noise, comfort, and humidity removal.

ON/OFF DELAY
Select the ON/OFF delay by using the White wire. This selection basically selects the desired time delay profile.
NOTE: Delay selections are active in cooling and heat pump heating modes only. Auxiliary heating modes have a one (1) minute off delay and zero (0) on delay programmed into the ECM motor that cannot be overridden.
Choose one (1) of four (4) motor operation delays to customize and enhance system operation as follows.
Selection options are:

1. 0/90: 0 (zero) second on-delay and 90 second off-delay at 100% airflow (factory setting).
2. 30/90: 30 second on-delay with no airflow and 90 second off- delay at 100% airflow profile. Used when it is desirable to allow system coils time to heat-up/cool-down in conjunction with the airflow.
3. 0/0: 0 (zero) second on-delay option and 0 (zero) second off- delay. Used for servicing unit or when a thermostat is utilized to perform delay
4. ENH: Enhanced selection provides a 30 second on-delay with no airflow followed by 150 seconds at 70% airflow, and 0(zero) second off-delay for added This profile will minimize cold blow in heat pump operation and could enhance system efficiency.

CONTINUOUS FAN

Select the desired Continuous fan speed when thermostat is set on continuous fan operation by using the Yellow jumper wire.

NOTE: If installed with a two-stage outdoor unit, do not select HI speed continuous fan. If HI is selected, low stage compression (low- speed cooling) will also run HI fan speed possibly resulting in insufficient dehumidification.

1. LO speed – factory setting, approximately 50% cooling mode airflow.
2. MED speed – move connector to MED, approximately 65% cooling mode
3. HI speed – move connector to HI, approximately 100% cooling mode

LOW-VOLTAGE CIRCUIT (FUSING AND REFERENCE)

The low-voltage circuit is fused by a board-mounted 5-amp

automotive fuse placed in series with the transformer SEC2 and the R circuit. The C circuit of the transformer is referenced to chassis ground through a printed circuit run at SEC1 connected to metal standoff marked with ground symbol.

QUICK SET UP

(BASIC AIR HANDLER CONFIGURATION)

The following basic configuration of the air handler will provide best performance of an Air Conditioner:

1. AUX HEAT KW/CFM – Select the heater range for the size electric heater
2. OUTDOOR UNIT SIZE – Select system size
3. SYSTEM TYPE – Select system type
4. AC/HP CFM ADJUST – Select
5. ON/OFF DELAY – Select 0/90
6. CONTINUOUS FAN – Select desired air handler when thermostat is set to continuous

The following basic configuration of the air handler will provide ARI rated performance of a Heat Pump:

1. AUX HEAT KW/CFM – Select the heater range for the size electric heater
2. OUTDOOR UNIT SIZE – Select system size
3. SYSTEM TYPE – Select system type HP-EFF.
4. AC/HP CFM ADJUST – Select
5. ON/OFF DELAY – Select 0/90
6. CONTINUOUS FAN – Select desired fan speed when thermostat is set to continuous

ACCESSORIES

AUXILLIARY TERMINALS

• The Fan Control Board contains the following auxiliary terminals, refer to Figure 6.
• HUM1 and AUX1 are in common with SEC1, and thermostat common.
• HUM2 and AUX2 terminals are tied directly to the G terminal from thermostat and provide a 24 VAC hot signal whenever the G terminal is energized.

HUMIDIFIER OPERATION WITH HUMIDISTAT
A standard humidistat can be used to operate a humidifier. The HUM1 is internally connected to 24V Common (C), and HUM2 is internally connected to (G). Refer to Figure 12 for typical Humidifier wiring layout using HUM1 (C), and HUM2 (G).
Alternately, the 24VAC signal may also be sourced from the W1 and Com (thermostat pigtail) connections when electric heaters are used as a primary heating source (refer to Figure 13).
NOTE: When using a thermostat with built-in humidity control, the above auxiliary terminals can be ignored, and the humidifier may be sourced directly from humidity terminals located on the thermostat itself.

DEHUMIDIFY CAPABILITY
The J1 jumper should always be removed from the Fan Control Board for proper airflow operation.
Latent capacities for systems using the AHV are better than average systems. If increased latent capacity is an application requirement, the field wiring (thermostat pigtail) connections provides a (Dh) for use with a standard humidity sensor/control (Refer to Figure 14 for additional latent control). The AHV will detect a closed contact between R and Dh (closing on a humidity rise) and reduce its airflow to approximately 80% of nominal cooling mode airflow. This reduction will increase the system latent capacity until the humidity falls to a level which causes the humidity sensor/control to open its contacts. When the contacts open, the airflow will return to 100% of the selected cooling airflow. Refer to Figure 15 for Normal Airflow Operation.

HEATER STAGING
The AHV modular fan control board is factory set for single-stage electric heat operation. Refer to Table 3 for available heaters.
When two-stage electric heat is desired, the J2 jumper must be removed. Refer to Table 3-2 for two-stage compatible heaters. Removing J2 will allow second stage control by the indoor wall thermostat (if multi-stage capable).

(no staging – all electric heat

together)

 | EHIA05KN| EHIA15KB
EHIA07KN| EHIA20KB
EHIA10KN| EHIA25KB
EHIA15KB|
EHIA20KB|
EHIA25KB|

AIRFLOW CHECK
For proper system operation, the air flow through the indoor coil should be between 350 and 450 CFM per ton of cooling capacity. The air flow through the unit can be determined by measuring the external static pressure to the unit.

1. Set up to measure external static pressure at the supply and return duct connections. Refer to Figure 16.
2. Drill holes in the ducts for pressure taps, pilot tubes, or other accurate pressure sensing
3. Connect these taps to a level inclined manometer or draft
4. Ensure the coil and filter are clean, and all the registers are
5. Determine the external static pressure with the blower operating at maximum
6. If the external static pressure is 2’’ w.c. or less, you can refer to the airflow tables in this manual.
7. If the external static pressure is over 1.2’’ w.c., check for obstructions in the ducts, insufficient return size or clogged air filter. Resolve and verify the static pressure is under 1.2’’ c.

TEMPERATURE RISE CHECK

Temperature rise is the difference between the supply and return air temperatures.

NOTE: The temperature rise can be adjusted by changing the heating speed tap at the fan control board. Refer to the unit’s Installation Instructions for airflow information.

A temperature rise greater than 60°F (33.3°C) is not recommended.

1. To check the temperature rise through the unit, place thermometers in the supply and return air ducts as close to the unit as possible, avoiding direct radiant heat from the heater elements.
2. Open ALL registers and duct dampers.
3. Set thermostat Heat-Cool selector to HEAT.
4. Set the thermostat temperature setting as high as it will
5. Turn electric power ON.
6. Operate unit AT LEAST 5 minutes, then check temperature

NOTE: The maximum outlet air temperature for all models is 200°F (93.3°C).

7. Set thermostat to normal temperature
8. Be sure to seal all holes in ducts if any were created during this process.

Table 4

|

*Modular Airflow Delivery (CFM) in Cooling Mode (either A/C or HP)**

---|---
Modular

Unit Size

| Outdoor

Unit Size

| Single-Stage

A/C Cooling

| Two-Stage Cooling| Fan Only
A/C Cooling – High| A/C Cooling – Low
Nominal| Dehum| Nominal| Dehum| Nominal| Dehum| LOW| MED| HI

AHV08

| 18| 600| 480| 600| 480| 480| 350| 350| 480| 600
24| 800| 640| 800| 640| 640| 400| 400| 640| 800
30| 1000| 800| 1000| 800| 800| 500| 500| 800| 1000
36| 1200| 960| 1200| 960| 960| 600| 600| 960| 1200

AHV12

| 24| 800| 640| 800| 640| 640| 400| 400| 640| 800
30| 1000| 800| 1000| 800| 800| 500| 500| 800| 1000
36| 1200| 960| 1200| 960| 960| 600| 600| 960| 1200
48| 1600| 1280| 1600| 1280| 1280| 800| 800| 1280| 1600

AHV16

| 36| 1200| 960| 1200| 960| 960| 600| 600| 960| 1200
42| 1400| 1120| 1400| 1120| 1120| 700| 700| 1120| 1400
48| 1600| 1280| 1600| 1280| 1280| 800| 800| 1280| 1600
60| 2000| 1600| 2000| 1600| 1600| 1000| 1000| 1600| 2000

AHV20

| 36| 1200| 960| 1200| 960| 960| 600| 600| 960| 1200
42| 1400| 1120| 1400| 1120| 1120| 700| 700| 1120| 1400
48| 1600| 1280| 1600| 1280| 1280| 800| 800| 1280| 1600
60| 2000| 1600| 2000| 1600| 1600| 1000| 1000| 1600| 2000

Table 5

|

*Modular Airflow Delivery (CFM) in Heat Pump Heating Mode Only**

Modular

Unit Size

| Outdoor

Unit Size

|

Tap

| Single-Stage

HP Heating

| Two-Stage Heating| Fan Only
HP Heating – High| HP Heating – Low
Comfort| Eff| Comfort| Eff| Comfort| Eff| LOW| MED| HI

AHV08

| 18| D| 525| 600| 525| 600| 420| 480| 350| 480| 600
24| C| 700| 800| 700| 800| 560| 640| 400| 640| 800
30| B| 875| 1000| 875| 1000| 700| 800| 500| 800| 1000
36| A| 1050| 1200| 1050| 1200| 840| 960| 600| 960| 1200

AHV12

| 24| D| 700| 800| 700| 800| 560| 640| 400| 640| 800
30| C| 875| 1000| 875| 1000| 700| 800| 500| 800| 1000
36| B| 1050| 1200| 1050| 1200| 840| 960| 600| 960| 1200
48| A| 1400| 1600| 1225| 1600| 1120| 1280| 800| 1280| 1600

AHV16

| 36| D| 1050| 1200| 1050| 1200| 840| 960| 600| 960| 1200
42| C| 1225| 1400| 1225| 1400| 980| 1120| 700| 1120| 1400
48| B| 1400| 1600| 1400| 1600| 1120| 1280| 800| 1280| 1600
60| A| 1750| 2000| 1750| 2000| 1400| 1600| 1000| 1600| 2000

AHV20

| 36| D| 1050| 1200| 1050| 1200| 840| 960| 600| 960| 1200
42| C| 1225| 1400| 1225| 1400| 980| 1120| 700| 1120| 1400
48| B| 1400| 1600| 1400| 1600| 1120| 1280| 800| 1280| 1600
60| A| 1750| 2000| 1750| 2000| 1400| 1600| 1000| 1600| 2000

NOTES:

1. The above airflows result with the AC/HP CFM ADJUST select jumper set on
2. Airflow can be adjusted +15% or -10% by selecting Hi or Lo respectively for all modes except fan
3. Dry coil at 230 volts and with 10kW heater and filter
4. Airflows shown are valid for systems with total static pressure between 0.1 and 1.2 in

*CFM = Cubic Feet per Minute

• THE MAXIMUM EXTERNAL STATIC PRESSURE IS 1.2’’ W.C., WITHOUT COOLING COIL. DEDUCT STATIC PRESSURE OF COIL FOR MAXIMUM STATIC PRESSURE.

VIOLET

Wire Selection

| A| B| C| D
AHV08| 15kw| —| 10kw| 5kw
AHV12| —| 15 thru 20kw| 10kw| 5kw
AHV16| —| 25kw| —| 5 thru 20kw
AHV20| —| —| 25kw| 5 thru 20kw

SEQUENCE OF OPERATION

AHV air handler will supply airflow in a range which is more than twice the range of a standard air handler. Each air handler size is designed to provide nominal cooling capacities at 50F evaporator temperature and the required airflow to match with any of four (4) different air conditioner or heat pump outdoor unit sizes. Table 2 outline the CFM range for the different AHV air handler.

The blower motor is a true variable speed motor designed to deliver constant CFM. Constant CFM is valid for systems with total external static pressure between 0.1 and 1.2 inches water column (25 and 174 Pa).

CONTINUOUS FAN

• Thermostat closes circuit R to
• Blower runs at continuous fan

COOLING MODE – SINGLE STAGE

• If indoor temperature is above temperature set point and humidity is below humidity set point, thermostat closes circuits R to G, R to Y/Y2 and R to

NOTE: For  single  stage  systems,  do  not  use   the   Y1  terminal.

• Air handler delivers single stage cooling

COOLING MODE – TWO STAGE

• First stage (low) cooling: Thermostat closes circuits to R to G, R to O, and R to
• Air handler delivers low stage cooling
• Second stage (high) cooling: Thermostat closes circuits to R to G, R to O, R to Y1 and R to Y/Y2.
• Air handler delivers high stage cooling

ELECTRIC HEAT HEATING MODE

• Thermostat closes circuit R to W/W1, or
• Air handler delivers the selected electric heat

HEAT PUMP HEATING MODE – SINGLE STAGE

• Thermostat closes circuits R to G and R to Y/Y2.

NOTE: For single stage systems,  do  not  use  the  Y1  terminal.

• Air handler delivers single stage heat pump heating

HEAT PUMP HEATING MODE – TWO STAGES

• First stage (low) heating: Thermostat closes circuits R to G and R to
• Air handler delivers low stage heating
• Second stage (high) heating: Thermostat closes R to G, R to Y1 and R to Y/Y2.
• Air handler delivers high stage heating

HEAT PUMP HEATING WITH AUXILIARY ELECTRIC HEAT

• Thermostat closes circuits R to G, R to Y/Y2 and/or R to Y1 with R to W/W1 or W2 (and R to O in the case of defrost).

If the thermostat calls for electric heat when the heat pump is operating in heating or defrost, the motor will modify the airflow if necessary. The motor will provide an airflow which is safe for the operation of the electric heat. That airflow is the greater of the heat pump heating airflow and the electric heat only airflow.

| CAUTION
---|---
P ROPERTY DAMAGE HAZARDFailure to follow this caution may result in property damage.A field fabricated auxiliary drain pan, with a separate drain is REQUIRED for all installations over a finished living space or in any area that may be damaged by overflow from a restricted main drain pan. In some localities, local codes require an auxiliary drain pan for ANY horizontalinstallation.

CARE AND MAINTENANCE

The system should be regularly inspected by a qualified service technician. Consult the servicing dealer for recommended frequency. Between visits, the only consumer service recommended or required is air filter maintenance and condensate drain operation.

AIR FILTER

Inspect air filters at least monthly and replace or clean as required. Disposable type filters should be replaced. Reusable type filters may be cleaned by soaking in mild detergent and rinsing with cold water. The frequency of cleaning depends upon the hours of operation and the local atmospheric conditions. Install filters with the arrows on the side pointing in the direction of air flow. Clean filters keep unit efficiency high.

LUBRICATION

The bearings of the blower motor are permanently lubricated.

CONDENSATE DRAINS

During the cooling season check the condensate drain lines to be sure that condensate is flowing from the primary drain but not from the secondary drain. If condensate ever flows from the secondary drain, the unit should be promptly shut off and the condensate pan and drains cleaned to insure a free flowing primary drain.

Wiring Diagram

REPLACEMENT PARTS

ITEM NO.| CURRENT PART#| ****

DESCRIPTION

| AHV08| AHV12| AHV16| AHV20
---|---|---|---|---|---|---
1| B60077-13| BLOWER DOOR ASS’Y| 1| –| –| –
B60077-14| –| 1| –| –
B60077-15| –| –| 1| –
B60077-16| –| –| –| 1
2| B60029| PLATE HEATER ADAPTER| –| 1| 1| 1
3| B60048| PLATE HEATER FILLER| –| –| 1| 1
4| B60106| WIRE CHANNEL| 1| 1| 1| 1
5| B60107| DECK BLOWER RAIL RIGHT/LEFT| 2| 2| 2| 2
6| B60093| FRONT BLOWER DECK| 1| –| –| –
B60094| –| 1| –| –
B60095| –| –| 1| –
B60096| –| –| –| 1
7| B60101| SIDE BLOWER DECK| 2| –| –| –
B60102| –| 2| –| –
B60103| –| –| 2| –
B60104| –| –| –| 2
8| B60097| REAR BLOWER DECK| 1| –| –| –
B60098| –| 1| –| –
B60099| –| –| 1| –
B60100| –| –| –| 1
9| B60076-01| PANEL TOP ASS’Y| 1| –| –| –
B60076-02| –| 1| –| –
B60076-03| –| –| 1| –
B60076-04| –| –| –| 1
10| B60089-02| LEFT SIDE WRAPPER| 1| 1| –| –
B60090-02| –| –| 1| 1
11| B60087-01| BACK WRAPPER| 1| –| –| –
B60087-02| –| 1| –| –
B60088-01| –| –| 1| –
B60088-02| –| –| –| 1
12| B60089-01| RIGHT SIDE WRAPPER| 1| 1| –| –
B60090-01| –| –| 1| 1
13| B60105-01| BRACE, BOTTOM FRONT| 1| –| –| –
B60105-02| –| 1| –| –
B60105-03| –| –| 1| –
B60036-04| –| –| –| 1
ITEM NO.| CURRENT PART#| ****

DESCRIPTION

| AHV08| AHV12| AHV16| AHV20
---|---|---|---|---|---|---
14| B60108| BLOWER RAIL RIGHT/LEFT| 1| 1| 1| 1
15| B60014-01| MOTOR ASS’Y (MOTOR, BAND AND LEGS)| 1| –| –| –
B60014-02| –| 1| –| –
B60014-03| –| –| 1| –
B60014-04| –| –| –| 1
16| B03811-19| MOTOR (WITH CONTROL MODULE)                   1/2HP – ECM| 1| –| –| –
B03811-20| 1/2HP – ECM| –| 1| –| –
B03812-07| 3/4HP – ECM| –| –| 1| –
B03812-08| 3/4HP -ECM| –| –| –| 1
17| Z01I027| BLOWER HOUSING WITH WHEEL                               100-7R| 1| –| –| –
Z01I028| 100-8R| –| 1| –| –
Z01I029| 100-9R| –| –| 1| 1
18| B60109-01| BRACKET CTL MTG| 1| –| –| –
B60109-02| –| 1| –| –
B60109-03| –| –| 1| 1
19| R99G009| FAN CONTROL BOARD MV| 1| 1| 1| 1
20| B60068| WIRE HARNESS (LOW VOLTAGE)| 1| 1| 1| 1
21| B60069| WIRE HARNESS (PRINCIPAL)| 1| 1| 1| 1
22| L01F017| TRANSFORMER 120/208/230-24v, 40VA| 1| 1| 1| 1
 |  |  |  |  |  |
Accessories|  |  |  |
 | DFB08-AH| DOWNFLOW BASE FOR AHV08 (Ref: B60121-01)| 1| –| –| –
 | DFB12-AH| DOWNFLOW BASE FOR AHV12 (Ref: B60121-02)| –| 1| –| –
 | DFB16-AH| DOWNFLOW BASE FOR AHV16 (Ref: B60121-03)| –| –| 1| –
 | DFB20-AH| DOWNFLOW BASE FOR AHV20 (Ref: B60121-04)| –| –| –| 1

Specifications are subject to change without notice

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