York Maxa Mier Erv Technical Guide

2015-09-09

• description
  • Note: MAXA-MI$ER® UERV’s are designed for use with rooftops using 14” high or greater roof curbs.
  • Note: ZF/ZH/ZJ/XP 037 thru 150 or ZS/ZU/ZW/XA-A3 thru -12, with ERV must use “slab” type economizers and downflow position.
• table of contents
  • LIST OF FIGURES
    • 1 unitized Energy recovery ventilator 4
    • 2 energy recovery wheel 4
    • 3 “P” series Pivoting wheel for units w/economizers 10
    • 4 uerv dimensional data - 036 through 060 18
    • 5 uerv dimensional data - 037 through 150 (3 - 12 1/2 Tons) 18
    • 6 uErv dimensional data - 180 through 300 (15 - 25 TONS) 19
    • 7 MODEL UNIT VR074 AND VR122 (25 - 40 tON) 20
  • list of TABLES
    • 8 UERV OUTSIDE AIR CFM SELECTION BY CFM 5
    • 9 PERFORMANCE - 3 THROUGH 12 1/2 TON UNITS 7
    • 10 PERFORMANCE - 15 THROUGH 25 TON UNITS 8
    • 11 PERFORMANCE - PIVOTING WHEEL MODELS 9
    • 12 specifications and electrical data - 300 through 550 cfm erv’s 11
    • 13 SPECIFICATIONS AND ELECTRICAL DATA - 600 THROUGH 1700 CFM ERV’S 12
    • 14 SPECIFICATIONS AND ELECTRICAL DATA - 1500 THROUGH 2800 CFM ERV’S 13
    • 15 SPECIFICATIONS AND ELECTRICAL DATA - 2800 THROUGH 3600 CFM ERV’S 14
    • 16 SPECIFICATIONS AND ELECTRICAL DATA - 3400 THROUGH 5600 CFM ERV’S 15
    • 17 SPECIFICATIONS AND ELECTRICAL DATA - 5500 THROUGH 6200 CFM ERV’S 16
    • 18 SPECIFICATIONS AND ELECTRICAL DATA - 6000 THROUGH 13000 CFM UERV’S 17
    • 19 Blower PERFORMANCE CHART - VR074 21
    • 20 Blower PERFORMANCE CHART - VR122 21
    • 21 Filter Sizes - Stand Alone erv Series 23
    • 22 Specifications and Electrical Data - 300 through 1100 CFM ERV's 24
    • 23 Specifications and Electrical Data - 1200 through 2000 CFM ERV's 25
    • 24 Specifications and Electrical Data - 1200 through 2800 CFM ERV's 26
    • 25 Specifications and Electrical Data - 2000 through 3600 CFM ERV's 27
  • list of TABLES (cont.)
    • 26 Specifications and Electrical Data - 3000 through 4600 CFM ERV's 28
    • 27 Specifications and Electrical Data - 4600 through 6200 CFM ERV's 29
    • 28 Specifications and Electrical Data - 6000 through 13000 CFM ERV's 30
    • 29 Airflow Performance - Downflow Configuration for D11 & D20 32
    • 30 Airflow Performance - Downflow Configuration for D028 & D036 33
    • 31 Airflow Performance - Downflow Configuration for D046 & D062 34
    • 32 Airflow Performance - Downflow Configuration for D080 & D120 35
    • 33 Airflow Performance - Side by Side Duct Configuration for S011 & S020 37
    • 34 Airflow Performance - Side by Side Duct Configuration for S028 & S036 38
    • 35 Airflow Performance - Side by Side Duct Configuration for S046 & S062 39
    • 36 Airflow Performance - Downflow Configuration for O011 & O020 41
    • 37 Airflow Performance - Downflow Configuration for 0028 & O036 42
    • 38 Airflow Performance - Downflow Configuration for O46 & O62 43
• UPG Uerv model nomenclature
• applications
  • Unitized Energy Recovery Ventilators (UERV) are used with the UPG rooftop packaged units. The internal wheel provides sensible and latent energy exchange between the entering and exhaust air streams of a building. This allows a substantial amount of ...
    • Principle of Operation
  • The UERV enthalpy wheel contains parallel layers of a polymeric material that are impregnated with silica gel (desiccant). The wheel is located in the entering (intake) air and exhaust air streams of the ventilation equipment. As the wheel rotates th...
    • AHRI/ANSI Standard 1060-2005 for Air-to-Air Energy Recovery Ventilation Equipment
  • The Air-Conditioning, Heating and Refrigeration Institute (AHRI) issued Standard 1060-2005 to certify air-to-air energy recovery ventilators. This standard deals specifically with the ratings of the Energy Recovery Wheel that is incorporated into the...
    • FIGURE 1 - unitized Energy recovery ventilator
  • Critical Terms for Standard 1060 are as follows:
    • 1. Effectiveness. The measured energy recovery effectiveness not adjusted to account for that portion of the psychrometric change in the leaving supply air (Station 2) that is the result of leakage of entering exhaust air (Station 3) rather than exch...
    • 2. Net Effectiveness. The measured recovery effectiveness adjusted to account for that portion of the psychometric change in the leaving supply air (Station 2) that is the result of leakage of the entering exhaust air (Station 3) rather than exchange...
    • 3. Exhaust Air Transfer Ratio (EATR). The tracer gas concentration difference between the leaving supply air (Station 2) and entering supply (outdoor) air stream (Station 1) divided by the tracer gas concentration in the entering exhaust (return) air...
    • 4. Outdoor Air Correction Factor (OACF). The entering supply (outdoor) airflow (Station 1) divided by the measured (gross) leaving supply airflow (Station 2).
    • Energy Recovery Wheel
  • The heart of the Energy Recovery Ventilator is the Energy Recovery Wheel (defined by AHRI as a rotary heat exchanger). The wheel has a patented design of parallel layers of wrapped polymeric material that is impregnated with a silica gel (desiccant)....
    • FIGURE 2 - energy recovery wheel
    • Cross Leakage in UErV’s (Purge Sectors)
  • The issue of cross leakage in rotary wheel based UERV's used in space conditioning applications is often misunderstood. As a result, many systems are installed with purge sectors and the additional fan capacity required to allow these sectors to func...
  • A purge sector minimizes the carry over cross leakage from the exhaust into the supply (outside air) air stream by shunting a portion of the supply air back into the exhaust air stream across the seal separating the exhaust and supply. This is requir...
  • In space conditioning applications, where the ventilation is operating to maintain acceptable indoor air quality, there are no contaminants in concentrations large enough to cause concern. Cross leakage in the UERV system results in a small amount of...
• optional accessories - FIELD INSTALLED
  • UERV Equipment Support - 8 inch (203 mm) high base for support of the exhaust and intake end of the UERV. Must be ordered separately from the UERV.
  • Equipment Support UERV Part No.
  • VR006 1ES0401
  • VR/P011 1ES0402
  • VR/P020 1ES0402
  • VR/P028 1ES0402
  • Equipment Support UERV Part No.
  • VR036 1ES0403
  • VR046 1ES0403
  • VR062 1ES0404
  • VR074
  • VR122
  • Roof Curb - A 14 or 24 inch (355 or 610 mm) roof curb is required to match supply and exhaust openings of the UERV with the rooftop units. UPG provides a full line of roof curbs to match the specified unit. See specification pages for required curb. ...
  • Stand Alone Balancing Damper - Balancing dampers are used with VO and VS models when ERV is connected to the rooftop unit, not to ductwork on the roof.
• optional accessories - FACTORY INSTALLED
  • Low Ambient Control Kit - Prevents frost formation on energy wheel heat transfer surfaces by terminating the intake blower operation when discharge air temperature falls below a field selectable temperature setting. Intake blower operation resumes op...
  • Pressure Sensor - Measurement device on the UERV to determine airflow across the Wheel.
  • Motorized Intake Air Damper - Damper mounts in the outdoor air intake hood. It opens when the UERV is energized and closes when de-energized.
  • Stop-Start-Jog - Function that rotates the Enthalpy Wheel (non-pivoting models) on a preset timer to prevent contamination of the wheel during economizer operation.
  • ERV Option Codes (ex.: VR028A12H4AL3 would be an R28 series high speed 460 volt UERV with a Low Ambient kit, Motorized Outside Air, and Stop-Start-Jog kit.)
  • L1 - Low Ambient Kit (LAK) *
  • L2 - LAK & Motorized. Outside Air (MOA) *
  • L3 - LAK, MOA, & Stop-Start-Jog (SSJ) *
  • L4 - LAK, MOA, SSJ, & Pressure Sensor (PS)
  • L5 - LAK and SSJ *
  • L6 - LAK, SSJ, and PS
  • L7 - LAK and PS
  • L8 - LAK, MOA, and PS
  • M1 - Motorized Outside Air (MOA) *
  • M2 - MOA and Stop-Start-Jog (SSJ) *
  • M3 - MOA, SSJ, and Pressure Sensor (PS)
  • M4 - MOA and PS
  • S1 - Stop-Start-Jog (SSJ) *
  • S2 - SSJ and Pressure Sensor (PS)
  • P1 - Pressure Sensor (PS)
  • NOTE: * denotes only options available for VR074 & VR122.
    • How to Select the proper Air Conditioning Unit and Unitary Energy Recovery Ventilator
      • 1. Determine the air conditioning load requirements with the required amount of outside air without an UERV.
      • 2. Select the proper UERV for the outside air CFM requirements and calculate the tonnage reduction through the UST or UERV software programs.
      • 3. Select the air conditioning unit required by reducing the load determined in step 1 by the reduction in step 2. (Example: If the load in Step 1 was 10 tons, and the reduction in Step 2 was 2.5 tons, select a 7.5 ton unit.)
      • 4. Select the proper UERV based on the selected unit. SEE Page 3 UERV Nomenclature for Details
  • Note 1: Complete UPG ERV model number includes the electrical information. Example ZF 060 needing 500 CFM outside of air at 230 volts/3 phase. Model would be a VR006A06H2AAA1.
  • Note 1: Complete UPG ERV model number includes the electrical information. Example: ZJ180 needing 2800 CFM outside of air at 230 volts/3 phase. Model would be a VR028A15H2AAA1.
  • Note 2: For VR074 and VR122 units used with an economizer must have the Start-Stop-Jog (SSJ) option.
    • Note 1: Complete UPG ERV model number includes the electrical information. Example ZF 060 needing 800 CFM outside of air at 230 volts/3 phase. Model would be a VP011A06H2AAA1.
    • 2: Models ZF/ZH/ZJ/XP* 037-150 & ZS/ZU/ZW/ZK/XA -A3-12 with ERV must use “slab” type economizers and downflow position.
      • FIGURE 3 - “P” series Pivoting wheel for units w/economizers
  • Note: 1: A stepdown transformer is provided to stepdown high voltage primary to 115 volt secondary.
  • Note: 1. Pivoting electrical data applies to VP models only.
  • * Electric data is for (A12) ZH/ZF/ZJ 078-150 and XP 078-150 only.
  • ** Electric data is for (A15 and A25) ZH/ZF/ZJ 180-300 and XP 180 and 240 only.
  • Note: Pivoting electrical data applies to VP models only.
    • FIGURE 4 - uerv dimensional data - 036 through 072 & -03 Through -A6 (3-6 Tons)
    • FIGURE 5 - uerv dimensional data - 037 through 150 & A3 THROUGH -12 (3 - 12 1/2 Tons)
    • FIGURE 6 - uErv dimensional data - 180 through 300 & -15 THROUGH -25 (15 - 25 TONS)
    • - Designed to meet unit specifications - 14’ High Curbs Required - Rooftop unit blower exceeds the capacity of the ERV Exhaust Blowers
    • - See blower performance charts for airflow at various external static pressures.
      • FIGURE 7 - MODEL UNIT VR074 AND VR122 (25 - 40 tON)
    • Notes:
    • 1. Drive losses included in the above table
    • 2. Performance can vary depending on ambient conditions
    • 3. Blower RPMs are for reference only
    • Notes:
    • 1. Drive losses included in the above table
    • 2. Performance can vary depending on ambient conditions
    • 3. Blower RPMs are for reference only
• UPG Uerv stand alone model nomenclature
• Performance - erv Series
  • Use this table to determine ventilation and size requirements. Table shows ERV Air Flow Range. AHRI certified performance rating provided in specifications and electrical data Effectiveness. "xL", "xM" and "xH" signify low, medium and high speed.
• Service Clearances - Stand Alone Series ERVs
  • AHRI Certified Ratings
  • AHRI Certified Ratingss
  • AHRI Certified Ratingss
  • AHRI Certified Ratingss
• D Series Stand Alone ERV'S For Down Discharge Duct Arrangements
  • Features and Notes
    • 1. Stand alone design allows higher levels of outdoor air to be introduced into the a/c space.
    • 2. Static test ports provided to verify intake and exhaust CFM.
    • 3. Balancing damper(s) field supplied in duct work when connected to ERV.
    • 4. Roof curbs are available for the ERV's.
    • 5. See blower performance charts for airflow at various E.S.P.
    • 6. Filter rack with 2" pleated filters included.
  • Blower RPM for D011
  • Notes:
  • 1. Drive losses included in the above table
  • 2. Performance can vary depending on ambient conditions
  • 3. Blower RPMs are for reference only
  • Blower RPM for D020
  • Notes:
  • 1. Drive losses included in the above table
  • 2. Performance can vary depending on ambient conditions
  • 3. Blower RPMs are for reference only
  • Blower RPM for D028
  • Notes:
  • 1. Drive losses included in the above table
  • 2. Performance can vary depending on ambient conditions
  • 3. Blower RPMs are for reference only
  • Blower RPM for D036
  • Notes:
  • 1. Drive losses included in the above table
  • 2. Performance can vary depending on ambient conditions
  • 3. Blower RPMs are for reference only
  • Blower RPM for D046
  • 1.25
  • 1360
  • 1425
  • 1530
  • 1585
  • 1650
  • Notes:
  • 1. Drive losses included in the above table
  • 2. Performance can vary depending on ambient conditions
  • 3. Blower RPMs are for reference only
  • Blower RPM for D062
  • Notes:
  • 1. Drive losses included in the above table
  • 2. Performance can vary depending on ambient conditions
  • 3. Blower RPMs are for reference only
  • Blower RPM for D080
  • Notes:
  • 1. Drive losses included in the above table
  • 2. Performance can vary depending on ambient conditions
  • 3. Blower RPMs are for reference only
  • Blower RPM for D120
  • Notes:
  • 1. Drive losses included in the above table
  • 2. Performance can vary depending on ambient conditions
  • 3. Blower RPMs are for reference only
• S Series Stand Alone ERV'S For Side by Side Duct Arrangements
  • Features and Notes
    • 1. Stand alone design allows higher levels of outdoor air to be introduced into the conditioned space.
    • 2. Static test ports provided to verify intake and exhaust CFM.
    • 3. Balancing damper(s) is field provided when connected to ductwork. System may not operate properly without balancing damper.
    • 4. Roof curbs are available for the ERV's.
    • 5. See blower performance charts for airflow at various E.S.P.
    • 6. Filter rack with 2" pleated filters included. Found in return air section.
  • Blower RPM for S011
  • Notes:
  • 1. Drive losses included in the above table
  • 2. Performance can vary depending on ambient conditions
  • 3. Blower RPMs are for reference only
  • Blower RPM for S020
  • 0.25
  • Notes:
  • 1. Drive losses included in the above table
  • 2. Performance can vary depending on ambient conditions
  • 3. Blower RPMs are for reference only
  • Blower RPM for S028
  • Notes:
  • 1. Drive losses included in the above table
  • 2. Performance can vary depending on ambient conditions
  • 3. Blower RPMs are for reference only
  • Blower RPM for S036
  • Notes:
  • 1. Drive losses included in the above table
  • 2. Performance can vary depending on ambient conditions
  • 3. Blower RPMs are for reference only
  • Blower RPM for S046
  • Notes:
  • 1. Drive losses included in the above table
  • 2. Performance can vary depending on ambient conditions
  • 3. Blower RPMs are for reference only
  • Blower RPM for S062
  • Notes:
  • 1. Drive losses included in the above table
  • 2. Performance can vary depending on ambient conditions
  • 3. Blower RPMs are for reference only
• O Series Stand Alone ERV'S For Over and Under Duct Arrangements
  • Features and Notes
    • 1. Stand alone design allows higher levels of outdoor air to be introduced into the conditioned space.
    • 2. Static test ports provided to verify intake and exhaust CFM.
    • 3. Balancing damper(s) is field provided when connected to ductwork. System may not operate properly without balancing damper.
    • 4. Roof curbs are available for the ERV's.
    • 5. See blower performance charts for airflow at various E.S.P.
    • 6. Filter rack with 2" pleated filters included. Found in return air section.
  • Blower RPM for O011
  • Notes:
  • 1. Drive losses included in the above table
  • 2. Performance can vary depending on ambient conditions
  • 3. Blower RPMs are for reference only
  • Blower RPM for O020
  • Notes:
  • 1. Drive losses included in the above table
  • 2. Performance can vary depending on ambient conditions
  • 3. Blower RPMs are for reference only
  • Blower RPM for O028
  • Notes:
  • 1. Drive losses included in the above table
  • 2. Performance can vary depending on ambient conditions
  • 3. Blower RPMs are for reference only
  • Blower RPM for O036
  • 1200
  • Notes:
  • 1. Drive losses included in the above table
  • 2. Performance can vary depending on ambient conditions
  • 3. Blower RPMs are for reference only
  • Blower RPM for O046
  • Notes:
  • 1. Drive losses included in the above table
  • 2. Performance can vary depending on ambient conditions
  • 3. Blower RPMs are for reference only
  • Blower RPM for O062
  • Notes:
  • 1. Drive losses included in the above table
  • 2. Performance can vary depending on ambient conditions
  • 3. Blower RPMs are for reference only
• guide specifications
  • Prepared for the guidance of architects, consulting engineers, and mechanical contractors.
    • General
  • Furnish and install _____________ mechanical cooling system, complete with a Unitized Energy Recovery Ventilator (UERV).
    • Approvals
  • The Unitized Energy Recovery Ventilator will contain an energy recovery component rated in accordance with AHRI/ ANSI Standard 1060-2005 with ratings certified by AHRI.
  • Cabinet
  • UERV shall be designed to attach directly to the a/c (rooftop, upflow, horizontal) unit. It shall be G90 galvanized material with a powdered enamel paint finish electrostatically bonded to the metal. Cabinet panels where conditioned air is handled sh...
  • Intake Air Blower (direct drive)
  • UERV shall contain a centrifugal blower. All UERV's will be equipped with direct drive PSC blower motors. The motor will be multiple speed and will be individually controlled. Airflow will also be adjustable by means of a damper on the intake air ope...
  • Intake Air Blower (belt drive)
  • UERV shall contain a centrifugal blower. It shall have ball bearings and adjustable belt drive. Motor mount base shall permit ease of motor changeover and belt tension adjustment. On pivoting wheel models, supply blower will be de- energized during e...
  • Exhaust Air Blower (direct drive)
  • UERV shall contain a centrifugal blower. All UERV's will be equipped with direct drive PSC blower motors. The motor will be multiple speed and shall be individually controlled. Blowers and motors will be removable through means of a connecting plug f...
  • Exhaust Air Blower (belt drive)
  • UERV shall contain a centrifugal blower. It shall have ball bearings and adjustable belt drive. Motor mount base shall permit ease of motor changeover and belt tension adjustment. On pivoting wheel models, exhaust blowers shall be sized to provide po...
  • Energy Recovery Wheel
  • The energy recovery device shall be a rotary heat exchanger per AHRI Standard 1060 description. The device will be an enthalpy wheel coated with a silica gel desiccant by a patented process without the use of binders or adhesives which may plug the d...
  • Balancing Dampers
  • Balancing dampers will be provided for all VR UERV’s. These dampers will be mounted inside the rooftop air conditioning unit to adjust for the amount of exhaust air on packaged units. On pivoting wheel models, the unit economizer becomes the balanc...
  • Barometric Relief Dampers
  • Barometric relief dampers will be provided in the exhaust air hood to prevent air infiltration when the UERV is de-energized.
  • ERV Support
  • All UERV's will be provided with support legs attached to the cabinet to support the intake and exhaust end of the ERV unit. Horizontal ERV's will be provided with support brackets for hanging.
  • Filters
  • All units shall be provided with mist eliminator type filters in the intake air hood.
  • Power Connection
  • The UERV shall be provided with a single point power connection for high voltage.
    • Options
  • Optional UERV Equipment Support
  • Furnish and install the optional equipment support for the intake and exhaust end of the unit.
  • Optional Roof Curb
  • Furnish and install the optional roof mounting frame to maintain proper height above the roof.
  • Optional Low Ambient Kit
  • Furnish and install the optional low ambient kit to prevent frost formation on the energy recovery wheel.
  • Optional Motorized Intake Air Damper
  • Furnish and install the optional motorized intake air damper.
  • Optional Stop-Start-Jog
  • On units without economizers furnish and install the optional stop-start-jog controls.
• SEQUENCE OF OPERATION:
  • Fixed Models - Normal Operation
    • 1. The space thermostat sends a signal to the RTU for cooling, heating or fan only operation.
    • 2. The ERV is activated simultaneously with the supply blower of the RTU. The intake blower, the exhaust blower, and the wheel rotation motor of the ERV are activated. These motors will remain energized as long as the supply blower on the RTU is ener...
    • 3. If the optional motorized fresh air damper in the outside air intake of the ERV is present, it opens and the ERV is energized.
    • 4. If the optional low ambient kit is present, and the temperature leaving the exhaust side of the wheel drops below the field adjusted set point on the temperature sensor of the low ambient kit, the optional motorized fresh air damper will close and...
  • Pivoting Models - Normal Operation
    • 1. The space thermostat sends a signal to the RTU for cooling, heating or fan only operation.
    • 2. The ERV is activated with the supply blower of the RTU. The intake blower, the exhaust blower, and the wheel rotation motor of the ERV are activated. These motors will remain energized as long as the supply blower on the RTU is energized and the R...
    • 3. If the optional motorized fresh air damper in the outside air intake of the ERV is present, it opens and the ERV is energized.
    • 4. If the optional low ambient kit is present, and the temperature leaving the exhaust side of the wheel drops below the field adjusted set point on the temperature sensor of the low ambient kit, the optional motorized fresh air damper will close and...
  • Pivoting Models - Economizer Operation
    • 1. The space thermostat sends a signal to the RTU for cooling operation.
    • 2. The outdoor air sensor for the RTU senses the outdoor air and determines it is appropriate for economizer operation.
    • 3. As the economizer outside air dampers open, the ERV economizer end switch is activated sending a signal to the ERV that the system is in the economizer mode.
    • 4. The intake blower, the exhaust blower and the wheel rotation motor all deactivate for up to two minutes. The optional motorized fresh air damper (if present) also closes.
    • 5. The ERV enthalpy wheel pivots out of the air stream and the bypass dampers along each side of the intake blower open.
    • 6. After a time delay to allow the wheel to pivot out of the airstream and the bypass dampers to open, the optional motorized fresh air damper opens to allow for full economizer operation, and the exhaust blower is reactivated to provide power exhaus...
• UERV troubleshooting guide
  • UERV BELOW 600 CFM WITH STATIONARY WHEEL (NO ECONOMIZER)
  • UERV will not operate.
    • 1. Quick check items.
    • a. Verify S51 door switch is closed. The switch must be in the closed position to power the A130 circuit board.
      • b. Verify the A130 circuit board switch SW1 Power is in the “on” position.
      • c. Verify 24 volts to A130 circuit board terminals TB1 “G” and “C” if in the cooling mode, or “W” and “C” if in the heating mode. The terminals must be powered to allow any blower relays / contactors to operate.
    • 2. Verify high voltage power to UERV.
    • a. Verify 110 volts for UERV to L1 and L2 on TB2 on the A130 board.
      • b. Verify the F1 fuse is good. Replace any bad fuses.
      • c. Verify that the T28 step down transformer on 208, 230, and 460 volt units have the voltage correctly applied to the correct transformer terminals.
  • UERV has power, but the enthalpy wheel does not spin.
    • 1. Check wheel belt is in place and tight.
    • 2. Verify the A130 circuit board switch SW1 Power is in the "on" position.
    • 3. Verify the A130 circuit board terminals Wheel "1" and "2" are outputting 110 volts to B28 wheel motor through J/ P150 plug assembly.
    • 4. Verify B28 wheel motor C23 capacitor is good. Replace the capacitor if it is bad.
    • 5. If the optional Stop, Start, Jog (SSJ) feature is installed, verify that the temperature setpoint on the SSJ does not have the wheel stopped.
    • 6. If all of the above are operational, the wheel motor is bad. Replace it with new motor.
  • UERV has power, but the exhaust blower does not operate.
    • 1. Verify the A130 circuit board switch SW1 Power is in the "on" position.
    • 2. Verify the A130 circuit board terminals Exhaust "1” and "3” if in high speed operation, or "1” and "2" if in low speed operation are outputting 110 volts to B26 exhaust blower motor though J/P151 plug assembly.
    • 3. Verify B26 wheel motor C25 capacitor is good. Replace the capacitor if it is bad.
    • 4. If all of the above are operational, the exhaust motor is bad. Replace it with new motor.
  • UERV has power, but the fresh air blower does not operate.
    • 1. Verify the A130 circuit board switch SW1 Power is in the "on" position.
    • 2. Verify the A130 circuit board terminals Fresh "1” and "3" if in high speed operation, or "1” and "2" if in low speed operation are outputting 110 volts to B27 fresh air blower motor though J/P148 plug assembly.
    • 3. On units equipped with the optional low ambient control, verify that the A130 circuit board TB3 terminals marked "low ambient" are closed. The low ambient control will stop the fresh air motor operation and close the optional outside air damper if...
    • 4. Verify B27 wheel motor C26 capacitor is good. Replace the capacitor if it is bad.
    • 5. If all of the above are operational, the fresh air motor is bad. Replace it with new motor.
  • UERV has power, but the optional motorized fresh air damper does not open.
    • 1. Verify 24 volts to A130 circuit board terminals TB1 "G" and "C" if in the cooling mode, or "W" and "C" if in the heating mode.
    • 2. Verify the A130 circuit board switch SW1 Power is in the "on" position.
    • 3. Verify 24 volts to B30 motorized outdoor air motor through J/P160 plug assembly.
    • 4. If all of the above are operational, replace the outdoor air damper motor.
    • UERV above 600 CFM WITH STATIONARY WHEEL (NO ECONOMIZER)
  • UERV will not operate.
    • 1. Quick check items.
    • a. Verify S51 door switch is closed. The switch must be in the closed position to power the A130 circuit board.
      • b. Verify 24 volts to A130 circuit board terminals XFORMER "+" and "-". The terminals must be powered to allow blower contactors to operate.
      • c. Verify 24 volts to A130 circuit board terminals TB 37 numbers "1" and "3". Terminal "1" is the hot and "3" is the common side of the power source from activation power source (a/c unit, energy management control, etc.). Typically, "1" would be fro...
    • 2. Verify high voltage power to UERV.
    • a. Check for correct voltage for UERV to L1 and L2 on 1-phase units.
      • b. Check for correct voltage for UERV to L1, L2, and L3 on 3-phase units.
      • c. Verify the F29 fuses are good. Replace any bad fuses.
      • d. Verify that the T27 transformer has the UERV voltage correctly applied to the correct transformer terminals.
  • UERV has power, but the enthalpy wheel does not spin.
    • 1. Check wheel belt is in place and tight.
    • 2. Verify the A130 circuit board terminals Exhaust "A" (hot) and "B" (common) are outputting 24 volts to K163 contactor terminal "A" and "B" and that the contacts are closed.
    • 3. Verify power to B28 wheel motor.
    • 4. Verify B28 wheel motor C23 capacitor is good. Replace the capacitor if it is bad. (Except VR074 to VR122)
    • 5. If the optional Stop, Start, Jog (SSJ) feature is installed, verify that the timer on the SSJ does not have the wheel stopped.
    • 6. If all of the above are operational, the wheel motor is bad. Replace it with new motor.
  • UERV has power, but the exhaust blower does not operate.
    • 1. Check that the blower belt is in place and tight on belt drive models. If it is loose, tighten it. If it is broken replace it.
    • 2. Verify the A130 circuit board terminals Exhaust "A" (hot) and "B" (common) are outputting 24 volts to K163 contactor terminal "A" and "B", and that the contacts are closed.
    • 3. Verify power to B26 exhaust blower motor.
    • 4. On direct drive models, verify B26 wheel motor C25 capacitor is good. Replace if necessary.
    • 5. If all of the above are operational, the exhaust motor is bad. Replace it with new motor.
  • UERV has power, but the fresh air blower does not operate.
    • 1. Check that the blower belt is in place and tight on belt drive models. Tighten it if it is loose. Replace it if it is broken.
    • 2. Verify the A130 circuit board terminals Fresh "A" (hot) and "B" (common) are outputting 24 volts to K164 contactor terminal "A" and "B", and that the contacts are closed.
    • 3. Verify power to B27 fresh air blower motor though J/ P148 plug assembly.
    • 4. On direct drive models, verify B27 wheel motor C26 capacitor is good. Replace if necessary.
    • 5. On units equipped with the optional low ambient control, verify that the circuit on the A130 circuit board terminal "5" and "6" is closed. The low ambient control will stop the fresh air motor operation and close the optional outside air damper if...
    • 6. If all of the above are operational, the fresh air motor is bad. Replace it with new motor.
  • UERV has power, but the optional motorized fresh air damper does not open.
    • 1. Verify 24 volts to the A130 circuit board terminals XFORMER "+" and "-".
    • 2. Verify 24 volts to A130 circuit board terminals TB 37 numbers "1" and "3". Terminal "1" is the hot and "3" is the common side of the power source from activation power source (a/c unit, energy management control, etc.). Typically, "1" would be fro...
    • 3. Verify 24 volts to B30 motorized outdoor air motor through J/P160 plug assembly.
    • 4. If all of the above are operational, replace the outdoor air damper motor.
    • UERV above 600 CFM WITH pivoting WHEEL (used with ECONOMIZER)
  • UERV will not operate.
    • 1. Quick check items.
    • a. Verify S51 door switch is closed. The switch must be in the closed position to power the A130 circuit board.
      • b. Verify 24 volts to A130 circuit board terminals XFORMER "+" and "-". The terminals must be powered to allow any blower relays / contactors to operate.
      • c. Verify 24 volts to A130 circuit board terminals TB 37 numbers "1" and "3". Terminal "1" is the hot and "3" is the common side of the power source from activation power source (a/c unit, energy management control, etc.). Typically, "1" would be fro...
    • 2. Verify high voltage power to UERV.
    • a. Check correct voltage for UERV to L1 and, L2 on 1- phase units.
      • b. Check for correct voltage to L1, L2, and L3 on 3- phase units.
      • c. Verify the F29 fuses are good. Replace any bad fuses.
      • d. Verify that the T27 transformer has the UERV voltage correctly applied to the correct transformer terminals.
  • UERV has power, but the enthalpy wheel does not spin.
    • 1. Check wheel belt is in place and tight.
    • 2. Verify the A130 circuit board terminals Exhaust 1 "A" (hot) and "B" (common) are outputting 24 volts to K163 contactor terminal "A" and "B" and that the contacts are closed.
    • 3. Verify power to B28 wheel motor through J/P150 plug assembly.
    • a. If there is no power on the T1 leg of the motor (pivoting models only) verify that the S110 switch located inside the B29 damper motor is in the closed position.
    • 4. Verify B28 wheel motor C23 capacitor is good. Replace the capacitor if it is bad.
    • 5. If all of the above are operational, the wheel motor is bad. Replace it with new motor.
  • UERV has power, but the exhaust blower does not operate.
    • 1. Check that the blower belt is in place and tight. If it is loose, tighten it. If it is broken replace it.
    • 2. Verify the A130 circuit board terminals Exhaust 1 "A" (hot) and "B" (common) are outputting 24 volts to K163 contactor terminal "A" and "B", and that the contacts are closed.
    • 3. Verify power to B26 exhaust blower motor though J/P151 plug assembly.
    • 4. On direct drive models, verify B26 wheel motor C25 capacitor is good. Replace if necessary.
    • 5. If all of the above are operational, the exhaust motor is bad. Replace it with new motor.
  • UERV has power, but the fresh air blower does not operate.
    • 1. Energy Recovery Mode of operation.
    • a. Check that the blower belt is in place and tight on belt drive models. Tighten it if it is loose. Replace it if it is broken.
      • b. Verify the A130 circuit board terminals Fresh "A" (hot) and "B" (common) are outputting 24 volts to K164 contactor terminal "A" and "B", and that the contacts are closed.
      • c. Verify power to B27 fresh air blower motor though J/ P148 plug assembly.
      • d. On units equipped with the optional low ambient control, verify that the circuit on the A130 circuit board terminal "5" and "6" is made. The low ambient control will stop the fresh air motor operation and close the optional outside air damper if i...
      • e. On direct drive models, verify B27 wheel motor C26 capacitor is good. Replace if necessary.
      • f. If all of the above are operational, the fresh air motor is bad. Replace it with new motor.
    • 2. Economizer Mode of operation.
    • a. The fresh air blower is not operational in the economizer mode.
  • UERV has power, but the wheel does not rotate out of airstream during economizer operation.
    • 1. Check the linkage from the B29 damper motor to the UERV wheel.
    • 2. Verify shipping retainers are removed.
    • 3. Verify the S122 economizer end switch is closed. The switch is located on the damper and closes when the damper moves from minimum position to the economizer position (field adjustable).
    • 4. Verify the B29 damper motor has 24 volts to terminals "B" and "T1" through J/P160 plug assembly
    • 5. If all of the above are operational, replace the damper motor.
  • UERV has power, but the optional motorized fresh air damper does not open.
    • 1. Verify 24 volts to the A130 circuit board terminals XFORMER "+" and "-".
    • 2. Verify 24 volts to A130 circuit board terminals TB 37 numbers "1" and "3". Terminal "1" is the "hot" and "3" is the "common" side of the power source from activation power source (a/c unit, energy management control, etc.). Typically, "1" would be...
    • 3. Verify 24 volts to B30 motorized outdoor air motor through J/P160 plug assembly.
    • 4. If all of the above are operational, replace the outdoor air damper motor.