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Frequently Asked Questions
This guide has been established to help the homeowner in getting the most out of his Greentek/Imperial HRV/ERV
General Information
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What is an HRV/ERV?

Heat recovering ventilators (HRV) and energy recovering ventilators (ERV) are air-exchanging systems that reduce energy consumption when heating or cooling. The mechanical devices, equipped with fans (excluding passive units), are designed to improve air quality and help control interior humidity by drawing in fresh air while exhausting stale indoor air. The HRV is a compact unit that conditions the temperature of the outside air, while the ERV is a packaged unit that conditions both the temperature and humidity of the outside air. Because these units condition the air before it enters the home, your energy costs remain stable. This concept offers the air quality only Mother Nature can provide with efficiency levels for the 21st century.

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Should I get an HRV or an ERV?

The choice of an HRV and an ERV depends on the climate. The general rule is ERVs are better suited for warmer climates (Air condition more than heating) and HRVs are for colder climates. Learn more… (link to “Heat Recovery Ventilation (HRV) or Energy Recovery Ventilation (ERV)”).

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What is the difference between an HRV and an ERV?

The HRV and ERV both ventilate, the difference is in the heat-recovering core. The HRV is equipped with a polypropylene core while the ERV has a paper core. Both cores transfer sensible heat while the ERV core also transfers latent heat (humidity transfer).

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What warranty comes with my HRV/ERV?

10-YEAR LIMITED WARRANTY ON VENTILATION MOTORS (PH & PE Series & DH 7.15) – Imperial Air Technologies warrants the ventilation motors against defects in material and workmanship for a period of ten years from the date of original installation. Imperial Air Technologies will provide a new or remanufactured part, at Imperial Air Technologies’ discretion, to authorize replacement of defective part, without charge for the part itself.

5-YEAR LIMITED WARRANTY ON VENTILATION MOTORS (SS 3.12FSD & SS 3.12DD) – Imperial Air Technologies warrants the ventilation motors against defects in material and workmanship for a period of five years from the date of original installation. Imperial Air Technologies will provide a new or remanufactured part, at Imperial Air Technologies’ discretion, to authorize replacement of defective part, without charge for the part itself.

LIFETIME LIMITED WARRANTY ON POLYPROPYLENE HEAT RECOVERY CORE – Imperial Air Technologies warrants the polypropylene heat recovery core against defects in material and workmanship for a lifetime from the date of original installation. Imperial Air Technologies will provide a new or remanufactured part, at Imperial Air Technologies’ discretion, to authorize replacement of defective part, without charge for the part itself.
 
1-YEAR LIMITED WARRANTY – Imperial Air Technologies warrants replacement parts that have been replaced after the standard period of the previous limited warranty, to be free from defects in material and workmanship. If a defect is found within one year from date of original installation of replacement part, (whether or not actual use begins on that date) Imperial Air Technologies will provide a new or remanufactured part, at Imperial Air Technologies discretion, to authorize replacement of defective part, without charge for the part itself.

WARRANTY CONDITIONS – Warranties apply only to Imperial Air Technologies products installed in their original location. Installation, use, care, and maintenance must be normal and in accordance with instructions contained in the Owner’s Manual and service information. Defective parts must be returned to the distributor through a registered servicing dealer for credit. All work shall be performed by a certified technician.

IMPERIAL AIR TECHNOLOGIES WILL NOT BE RESPONSIBLE FOR – Normal maintenance, installation, including filter cleaning and/or replacement, damage or repairs required as a consequence of faulty installation, misapplication, abuse, improper servicing, unauthorized alteration or improper operation. Damage as a result of floods, winds, fires, lightning, accidents, corrosive environments or other conditions beyond the control of Imperial Air Technologies. Parts not supplied or designated by Imperial Air Technologies, or damages resulting from their use

Ventilation
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Why is ventilation important?

Improvements in home building techniques have lead to homes being more and more airtight. Although this dramatically improved energy efficiency, it eliminated natural ventilation that occurred when air freely seeped in and out.

As all humans need fresh air, so does your home. Mechanical ventilation will provide fresh air, while exhausting indoor pollutants varying from dangerous argon gasses to annoying cooking smells. It also provides a great defense against mold and excess humidity.

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How much ventilation is required?

Ventilation requirements are measured in cubic feet per minute (CFMs) of air. There are several ways to determine the right amount needed. Some rely strictly on the size of the home; others rely on the number of rooms.

The Room Count Calculation or the Air Change per Hour (Room_AirCalculators.pdf) method shows you how to determine your ventilation needs.

The American Society of Heating, Refrigeration and Air-Conditioning Engineers (ASHRAE) recommend a 0.35 air exchanges per hour for residential use.

Note: Always consult your local building code for minimum ventilation requirements.

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Can I tie in my HRV with my forced air system?

Yes. This is the simplest method of installation when adding an HVR to an existing HVAC system.

Wiring diagrams and schematics are included in the installation manual. The schematics and wiring diagrams are explained in the installation manual.

Note: When the HRV is tied in to the forced air system, it is important that they run simultaneously.

Humidity Control
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Does an HRV/ERV control humidity?

An HRV/ERV controls humidity to a certain extent. Humidity can be created many ways inside the house. Whether it be cooking, showering or simply exhaling, humidity levels can increase indoors. Ventilation will help lower the humidity by exhausting the air while drawing in the outdoor fresh air.

That said, if the air outside were more humid than the air inside, the HRV would not be able to decrease the amount of moisture contained in the indoor air.

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What causes condensation on my windows during the winter, and what can I do to eliminate the problem?

Condensation happens when air gets cooled below its dew point (Maybe hyperlink to wikipedia or website that explains dew point). The air is no longer capable of holding moisture, so the water condensates. This normally occurs around windows because they are less insulated, therefore cooler in winter months.

Proper ventilation will reduce humidity in winter, along with constant air circulation. This will reduce condensation on the windows.

Operating the HRV/ERV
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Which wall controller is available for my unit?

Greentek/Imperial offers a variety of controllers (link to wall controls page) for added HRV/ERV functions. We also offer a timer designed to be installed in a bathroom. This timer (link) activates high speed for a period of 20, 40 or 60 minutes for added humidity evacuation.

Note: All the units are able to function without a controller.

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Where should I set the humidistat (available for all units on the RD1, RD2, RD3P, RD3D, RD4P and RD4D)?

The humidistat activates high speed on the HRV/ERV. It should be set in the comfort zone during heating periods, and turned off during the summer.

The reason behind this is air tends to be more humid in the summer. If the air outside is more humid than the air inside, the HRV/ERV won’t be able to dehumidify.

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What does the LED light on my wall controller indicate?

Some Wall controllers have an LED light (RD-2 and up). An orange light indicates the unit is powered while a green light indicates the unit is in high speed.

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Should I turn off my HRV/ERV in the summer?

An HRV/ERV is a mechanical ventilation machine required when natural ventilation isn’t available. If windows are left open during the summer, running the HRV/ERV is not necessary.

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What are the advantages of re-circulation mode (available on the Deluxe model and SS 3.12 DD)?

Re-circulation means that the HRV/ERV draws air from inside the house and re-distributes it. No outside air enters the house. This can be activated with the wall controls (RD-3D and RD-4D).

This feature can be useful on extreme cold days when fresh air isn’t needed. The heating load on your house will be reduced and that’s money in your pocket.

Product Information
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What model is right for my house?

When choosing an HRV/ERV, 4 things should be considered: Capacity, efficiency, application and cost.

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How is efficiency measured?

All Greentek/Imperial H/ERVs are tested by the Home Ventilation Institute (www.HVI.org).

All testing procedures have been developed by HVI in order to test all aspects of an H/ERV.

Efficiency terms for HRV/ERV's
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What does ASE mean?

Apparent Sensible Effectiveness (ASE): The measured temperature rise of the supply air stream divided by the difference between the supply temperature (point 1) and exhaust temperature (point 3) and multiplied by the ratio of mass flow rate of the supply divided by the minimum of the mass flow rate of the supply or exhaust streams. This value is useful principally to predict final delivered air temperature at a given flow rate.

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What does SRE mean?

Sensible Recovery Efficiency (SRE): The sensible energy recovered minus the supply fan energy and preheat coil energy, divided by the sensible energy exhausted plus the exhaust fan energy. This calculation corrects for the effects of cross-leakage, purchased energy for fan and controls, as well as defrost systems. This value is used principally to predict and compare energy performance.

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What does TRS mean?

Total Recovery Efficiency (TRE): The total energy (enthalpy) recovered minus the supply fan energy and the preheat coil energy, divided by the total energy (enthalpy) exhausted plus the exhaust fan energy. This calculation corrects for the effects of cross-leakage and external purchased energy for fans and controls. It is used principally to predict and compare energy performance.

HRV/ERV Maintenance
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What type of preventative maintenance should I perform on my HRV/ERV?

Greentek/Imperial HRV/ERV are equipped with sealed motors. No preventative maintenance is required on any mechanical part. The home owner must only assure that the unit is clean.

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How and when do I clean the filters?

Filters can be cleaned with a vacuum or wash. We recommend cleaning them four times a year.

Hint: The filter on the intake side (left side) will accumulate more dirt than the exhaust filter. To extend their lives, they can be swapped after a certain period of time.

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How do I clean the heat-recovering core?

Once a year or as needed, vacuum all 4 sides and soak in warm water for 15 minutes. Then Rinse the core with shower head or hose without scrubbing. Then let it either air dry or use a hair dryer. If you clean your core during the cold season, please make sure that the core is completely dry before reinstalling.

 

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How do I clean the inside of the cabinet?

Inside of the cabinet should be washed using a damp cloth and mild non-abrasive soap. We recommend using an environmentally friendly cleaner.

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