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Part #473501
ERCH-HP Energy Recovery Ventilator
®
with Heat Pump
Installation, Operation and Maintenance Manual
Please read and save these instructions. Read carefully before attempting to assemble, install, operate or maintain the
product described. Protect yourself and others by observing all safety information. Failure to comply with instructions could
result in personal injury and/or property damage! Retain instructions for future reference.
Model ERCH-HP
General Safety Information
Only qu
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Receiving Storage Upon receiving the product, check to make sure all Units are protected against damage during shipment. If items are accounted for by referencing the bill of lading the unit cannot be installed and operated immediately, to ensure all items were received. Inspect each crate for precautions need to be taken to prevent deterioration of shipping damage before accepting delivery. Notify the the unit during storage. The user assumes responsibility carrier if any damage is noticed.
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Table of Contents General Safety Information ....................1 Energy Wheel Receiving, Handling and Storage ...............2 Start-Up ..................................22 Product Overview ............................4 Sequence of Operation ......................22 Models and Capacities ........................4 Maintenance ...............................23 Subassemblies Troubleshooting ............................24 Coils ......................................5 Heat Pump Overview Damp
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Product Overview Models and Capacities This unit brings in fresh, outdoor air and removes This unit is manufactured in four different platform sizes; stale exhaust air from the building. The intake and 20, 45, 55 and 90. Each platform has multiple options exhaust airstreams move through the unit in opposite for heating and cooling capacities. directions in separate passages, and each airstream All 4, 5 and 6 ton capacity units have a single scroll passes through an energy wheel. In cooling m
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Subassemblies Coils Energy Wheel The airside coil is connected to the heat pump The energy wheel rotates through both the outdoor air compressor(s) and is the primary vehicle for heating and the exhaust airstreams, removing both sensible and cooling of the building. A reheat coil is optionally (heat) energy and latent moisture from one airstream available and is installed in the supply airstream and transferring it to the other airstream. The energy adjacent to the airside coil. The reheat c
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Heat Pump Module Optional Electric Heaters Every unit has an integral heat pump module that There are two optional electric heaters available. One is contains hermetic scroll-type compressor(s), a coaxial a preheater and is used to prevent frost buildup on the refrigerant-to-water heat exchanger(s), refrigerant flow energy wheel. It is located directly in front of the intake reversing valve(s), expansion valve(s), liquid line filter air filter assembly. The second optional heater is used dri
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Installation Dimensional Data Overall Exterior Dimensions Model Width Overall Width Overall Length (including Lifting Lugs) (with Exhaust Hood) (with Outdoor Air Hood) ERCH-HP 20 59.5 75 116 ERCH-HP 45 69.5 86 122 ERCH-HP 55 79.5 101 134 ERCH-HP 90 99.5 123 147 All dimensions shown are in inches. Unit Weights and Recommended Roof Opening V Exhaust Intake U Supply Discharge 1/2 inch 1/2 inch 1/2 inch Approximate Unit Size U V Weight (pounds) ERCH-HP 20 46 37 2150 ERCH-HP 45 54 39 3500 ERCH-HP 5
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Service Clearances Minimum clearances are required for access on all sides for routine maintenance. Filter replacement, drain pan inspection and cleaning, energy wheel cassette inspection, fan bearing lubrication and belt adjustment are examples of routine maintenance that must be performed. Blower and motor assemblies, energy wheel cassette, coil and filter sections are always provided with a service door or panel for proper component access. Clearances for component removal may be greater
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Handling While this unit was constructed with quality and WARNING dependability in mind, damage still may occur during All factory provided lifting lugs must be used when handling of the unit for installation. Exercise extreme lifting the units. Failure to comply with this safety caution to prevent any damage from occurring to precaution could result in property damage, serious the refrigerant system. This unit contains a system injury, or death. Unit weights assume rooftop pressurized
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Roof Curb Mounting Curb Outside Dimensions and Weights Rooftop units require curbs to be mounted first. The duct connections must be located so they will be clear SIDE OF UNIT of structural members of the building. BASE A Factory Supplied Roof Curbs: Roof curbs are Model GKD, which are shipped in a knockdown kit (includes B duct adapter) and require field assembly (by others). C Assembly instructions are included with the curb. D E 1 INCH INSULATION Install Curb: Locate curb over roof openi
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n n n n o o o o i i i i t t t t a a a a t t t t o o o o R R R R n n n n Turning Vanes Turning Vanes POOR GOOD POOR GOOD Ductwork Connections Rail Mounting / Layout Examples of poor and good fan-to-duct connections • Rails designed to handle the weight of the unit are shown below. Airflow out of the fan should be positioned as shown on the diagram should be directed straight or curve (rails by others). the same direction as the • Make sure that rail positioning does not interfere fan whee
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Start-Up Unit Every installation requires a comprehensive start-up DANGER to ensure proper operation of the unit. As part of that Electric shock hazard. Can cause injury or death. process, the following checklist must be completed and Before attempting to perform any service or information recorded. Starting up the unit in accordance maintenance, turn the electrical power to unit to OFF with this checklist will not only ensure proper operation, at disconnect switch(es). Unit may have mul
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Pre-Start-Up Checklist SPECIAL TOOLS REQUIRED o Disconnect and lock-out all power switches. • Voltage Meter (with wire probes) o Remove any foreign objects that are located in the • Amperage Meter energy recovery unit. • Pressure Gauges – (refrigerant) o Check all fasteners, set-screws, and locking collars • Tachometer on the fans, bearings, drives, motor bases and • Thermometer accessories for tightness. • Incline manometer or equivalent o Rotate the fan wheels and energy recovery wheels by
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Unit Start-Up Checklist Line Voltage. Check at unit disconnect. L1-L2 Volts L2-L3 Volts L1-L3 Volts Motor Amp Draw Supply Motor Amps L1 Amps L2 Amps L3 Amps Exhaust Motor Amps L1 Amps L2 Amps L3 Amps Fan RPM Supply Fan RPM Exhaust Fan RPM Correct fan rotation direction? Supply Fan Yes / No Exhaust Fan Yes / No Energy Wheel Motor L1 Amps L2 Amps L3 Amps Compressors Compressor 1 L1 Amps L2 Amps L3 Amps Crankcase Heater Amps Compressor 2 L1 Amps L2 Amps L3 Amps Crankcase Heater Amps Condensing
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Voltage, Hertz, Phase VOLTS HZ PH EXH HP SUP HP MCA MOP Electrical Information Determine the Size of the Main Power Lines Unit’s Total MCA WARNING The unit’s nameplate states the voltage and the unit’s MCA. The main power lines to the unit should be sized The roof lining contains high voltage wiring. To prevent accordingly. The nameplate is located on the outside of electrocution, do not puncture the interior or exterior the unit on the control panel side. panels of the roof. WARNING Volta
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Most factory-supplied electrical components are Plumbing / Piping Overview prewired. To determine what electrical accessories require additional field-wiring, refer to the unit-specific Condensate Drain Trap wiring diagram located on the inside of the control This unit is equipped with a stainless steel condensate center access door. pan with a stainless steel connection. It is important that the drain connection be fitted with a P trap to The low voltage control circuit is 24 VAC and cont
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Indicator Lights powered by the ER Unit Optional Remote Control Panel and Wiring Schematics R The remote panel is a series of junction boxes ganged C together and includes a stainless steel faceplate. The Unit On/Off G remote panel is available with a number of different Y1 alarm lights and switches to control the unit. The remote Y2 W1 panel ships loose and requires mounting and wiring in Frost Control 6 the field Economizer 7 Rotation Sensor 12 The remote panel is available with the fol
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Typical Control Center Components - individual components and locations will vary 1. Main disconnect (non-fusible, lockable) Optional Control Center Components 2. Motor starter - exhaust air fan 12. DDC controller 3. Motor starter - outdoor air fan 13. Dirty filter pressure switches 4. Motor contactor - energy wheel 14. Economizer module 5. 24 VAC control transformer 15. Thermostats for: 6. 24 VAC terminal strip - Economizer module 7. Fuses for blower motors - Energy recovery wheel
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Electrical Controls • Turn the temperature sensor up as high as Optional Frost Control possible. The supply blower should cycle on for Extremely cold outdoor air temperatures can cause one minute, then turn off for one minute. moisture condensation and frosting on the enthalpy • After testing, set the Timer Scale as follows: wheel. Frost control is an optional feature that will T1 = 10 minutes, T2 = 1 hour prevent/control wheel frosting. Three options are • Set the Timer Settings as f
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Optional Economizer The energy wheel operation can be altered to take Modulating the wheel: In applications in which an advantage of economizer operation (free cooling). Two internal heat gain is present in the space, the rotational modes are available: speed of the energy wheel may be modulated (via 1. De-energizing the wheel. variable frequency drive) to avoid overheating the space 2. Modulating the wheel. during the winter. The speed of the energy wheel will be controlled in respons
