SystemAir fantech SHR 150R

Questions and Answers

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jeremy06Aug 3, 2025
Why does the supply air feel cold from my SystemAir fantech SHR 150R Heating System?
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  Angela VasquezAug 3, 2025
  If the air from your SystemAir Heating System feels cold, it might be because of the location of the supply grilles, which can irritate occupants. Try locating the grilles high on the walls or under the baseboards, or install ceiling-mounted diffusers or grilles to avoid direct airflow onto occupants. Reducing the HRV supply speed can also help. In very cold weather, if the supply air is ducted into the furnace return, run the furnace fan continuously to distribute ventilation air more comfortably. Also check if furniture placement or closed doors are restricting airflow in the home.
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Heather HannaAug 7, 2025
How to improve poor air flows in SystemAir fantech SHR 150R Heating System?
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  Ronald LyonsAug 7, 2025
  Poor air flows in your SystemAir Heating System can occur if the 1/4" (6mm) mesh on the outside hoods is plugged. In this case you should clean exterior hoods or vents. Also, check if the filters or core are plugged and remove and clean them. Ensure that indoor grilles are open and not blocked. If the power supply is inadequate, have an electrician check the supply voltage. Check the duct installation for restrictions. Increase the speed of the HRV (i.e. change unit control from REDUCED to NORMAL speed). If the HRV airflow is improperly balanced or ducting has fallen down or been disconnected from HRV, have a contractor address these issues.
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Jason McleanAug 11, 2025
What to do if there is persistent condensation on the window with SystemAir fantech SHR 150R Heating System?
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  Christopher GregoryAug 11, 2025
  To address persistent condensation on windows with your SystemAir Heating System, reduce the desired level of humidity and use continuous exchange mode. If the HRV is out of balance, have a contractor balance it. Also, ensure good air circulation by opening curtains or blinds.
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agarrisonAug 16, 2025
Why is the air too humid with SystemAir fantech SHR 150R Heating System?
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  Emily GordonAug 16, 2025
  If the air is too humid with your SystemAir Heating System, reduce the desired level of humidity and combine this with the use of continuous exchange mode. If there is a sudden change in temperature, wait until the outside temperature stabilizes, especially in winter. Heating will also improve the situation. Ensure you are not storing too much wood inside; store most of it outside. Make sure the dryer vent exhausts outside. Improve air circulation near windows by opening curtains or blinds. If you have a well-sealed basement door, open it or install a grill on the door. Finally, check the defrost damper; if it's stuck blocking fresh air, have a contractor verify the damper system.
P
pgibsonAug 19, 2025
How to fix condensation or ice build up in insulated duct to the outside of SystemAir fantech SHR 150R?
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  Jessica SanchezAug 20, 2025
  If you notice condensation or ice build-up in the insulated duct to the outside of your SystemAir Heating System, tape and seal all joints to ensure a complete vapor barrier around the insulated duct. Also, tape any holes or tears in the outer duct covering and ensure the vapor barrier is completely sealed.
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Kathleen MarshallAug 25, 2025
What to do if HRV and/or ducts are frosting up in SystemAir fantech SHR 150R?
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  Daniel HobbsAug 25, 2025
  If your SystemAir Heating System's HRV and/or ducts are frosting up, have an HVAC contractor balance the HRV airflows. Note that minimal frost build-up is expected on the core before the unit initiates defrost cycle functions.
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John HolmesAug 28, 2025
How to fix if air is too dry with SystemAir fantech SHR 150R Heating System?
- D
  David HayesAug 28, 2025
  If the air is too dry with your SystemAir Heating System, increase the desired level of humidity by adjusting the dehumidistat control. You can also change the ventilation mode from continuous mode to standby.

Summary

DETERMINING YOUR AIRFLOW REQUIREMENT

Room Count Method

Method for calculating ventilation needs based on room count and type.

ASHRAE method

Ventilation calculation based on floor area and number of bedrooms.

INSTALLATION EXAMPLES

FULLY DEDICATED SYSTEM

System drawing stale air from exhaust areas and supplying fresh air to living areas.

HRV ducting for fully Dedicated System

Illustrates ducting configuration for a fully dedicated system installation.

INSTALLATION EXAMPLES (CONTD)

PARTIALLY DEDICATED SYSTEM (BETTER)

Connects HRV fresh air to furnace return plenum, stale air from key areas.

HRV;Furnace ducting for Partially Dedicated System

Shows ducting for connecting HRV to a furnace's return air plenum.

INSTALLATION EXAMPLES (CONTD)

SIMPLIFIED INSTALLATION (GOOD) (RETURN;RETURN METHOD)

Connects HRV supply and exhaust streams to furnace cold air return.

HRV;Furnace ducting for Simplified Installation - Option 1

Illustrates ducting for simplified installation connecting to furnace cold air return.

EXTERIOR DUCTING INSTALLATION

WEATHERHOOD LOCATION

Guidelines for positioning intake and exhaust weatherhoods on exterior walls.

INSTALLING THE DUCTING TO THE WEATHERHOODS

Instructions for connecting flexible insulated duct to weatherhoods.

STEPS FOR HOOD INSTALLATION

Step-by-step guide for physically installing exterior hoods.

INTERIOR DUCTING INSTALLATION

Installing ducting to HRV

Method for connecting flexible or solid ducting to the HRV unit.

Supply air grilles location

Recommendations for locating supply air grilles in different home types.

Exhaust air grilles location

Recommendations for locating exhaust air grilles in areas with poor air quality.

HRV INSTALLATION

LOCATION

Criteria for selecting an appropriate installation location for the HRV unit.

Mounting- Chain mount

Detailed steps for mounting the HRV unit using a chain system.

INSTALLING DRAIN LINE

Start up procedure

Steps to follow for initiating the HRV unit after installation.

Airflow balancing

Procedure to ensure equal supply and return airflow for optimal operation.

Airflow balancing (Contd)

Adjusting airflows

How to adjust the integrated damper for desired airflow.

Measuring the airflow using station (grid) method

Method and tools for measuring airflow velocity using a measuring station.

Low Voltage Control Systems

CENTRAL CONTROLS

Overview of primary control systems for the HRV unit.

AUXILIARY CONTROL

Description of secondary or supplemental control devices for the HRV.

WIRING DIAGRAM - SHR150 R

LEGEND

Key to understanding symbols and abbreviations used in the wiring diagram.

NOTES

Crucial notes regarding wiring, fuses, and polarity for installation.

WIRING DIAGRAM (CONTD)

WIRING DIAGRAM TO FURNACE

Wiring connections between the HRV and a furnace system.

FOR A FURNACE CONNECTION TO A COOLING SYSTEM:

Details for wiring the HRV when connecting to a furnace with cooling capabilities.

TROUBLESHOOTING

Air is too dry

Identifies causes and solutions for excessively dry indoor air.

Air is too humid

Identifies causes and solutions for excessively humid indoor air.

Persistent condensation on window

Addresses causes and solutions for condensation forming on windows.

Poor Air Flows

Discusses issues related to insufficient or restricted airflow within the system.

Supply air feels cold

Explains why supply air might feel cold and how to resolve it.

HRV and;or Ducts frosting up

Addresses the causes and solutions for frost accumulation on the HRV or ducts.

Condensation or Ice Build Up in Insulated Duct to the Outside

Solutions for ice or condensation forming in the outdoor insulated ductwork.

LED is flashing

Troubleshooting steps when the unit's LED indicator is flashing.

LED is not flashing

Troubleshooting steps when the unit's LED indicator is not illuminated.

HRV MAINTENANCE CHART

Limited Warranty

Details the warranty coverage, limitations, and responsibilities for the HRV unit.