RenewAire HE-Series Energy Recovery Ventilator ERV Instruction Manual
- June 15, 2024
- RenewAire
Table of Contents
RenewAire HE-Series Energy Recovery Ventilator ERV
Specifications
- Product Name: Filter Alarm
- Compatible Options: HE-Series, LE-Series, RD-Series
- Switch Type: Single-pole double throw
- Adjustment Range of Pressure Differential Switch: Not specified
Product Usage Instructions
Overview
The Filter Alarm is designed to monitor the pressure differential in the
ERV (Energy Recovery Ventilator) unit. It features a switch that changes its
position based on the pressure differential. When the pressure differential is
below the setpoint, the switch is in the normally closed (NC) position, and
when the pressure differential exceeds the setpoint, the switch moves to the
normally open (NO) position.
Installation
Connecting to the Alarm System
To connect the Filter Alarm to an alarm system, follow these steps:
- Ensure that the wiring is done by qualified personnel by the requirements of the authority having jurisdiction.
- Seal any wiring penetrations into the unit to maintain air-tightness and thermal integrity.
- Re-install the cover for wiring connections after adjusting the pressure differential.
- Take care not to contact electrical terminals while adjusting the pressure differential.
Adjustment Range of Pressure Differential Switch
The adjustment range of the pressure differential switch is not specified
in the user manual. Please refer to the product specifications or contact
RenewAire Customer Service for more information.
Adjustment of Pressure Setting
- Follow these steps to adjust the pressure setting:
- Ensure that the ERV is operational with clean filters and all other components in place.
- If the alarm sounds, increase the pressure differential setting. If the alarm does not sound, decrease the pressure differential setting.
- Turn off the ERV and adjust the differential setting.
- Operate the ERV again and repeat the adjustment procedure until you find the highest pressure setting that does not trigger the alarm.
- To achieve the desired loading of the filter, adjust the pressure differential switch as follows:
- For pleated filters, it is typically recommended to add a pressure drop of 0.25.
- Turn the adjustment knob clockwise to increase the pressure setting.
- Each complete revolution of the adjustment knob changes the pressure setting by 0.2. For a 0.25 setting, turn the knob 1-1/4 times.
- Always remember to reinstall the cover plate after making adjustments.
Factory Assistance
- If you require assistance from the factory regarding any specific issues with the ERV or its Filter Alarm Option, please contact RenewAire Customer Service using the following details:
- Call : 800-627-4499
- Email: RenewAireSupport@RenewAire.com
- Please have the unit configuration code or serial number ready when contacting Customer Service for faster assistance. Please note that RenewAire Customer Service can only assist with the ERV and its options and cannot resolve engineering issues related to air handling system design by others.
FAQ
- What is the adjustment range of the pressure differential switch?
The user manual does not specify the adjustment range of the pressure differential switch. Please refer to the product specifications or contact RenewAire Customer Service for more information.
WARNING
RISK OF FIRE, ELECTRIC SHOCK, OR INJURY. OBSERVE ALL CODES AND THE FOLLOWING:
- Wiring must be done by qualified personnel by requirements of the authority having jurisdiction.
- Wiring penetrations into the unit must be sealed to be air-tight and maintain the thermal integrity of the unit insulation.
- The unit must be installed so that the diaphragm of the pressure switch is in the vertical plane.
- The differential pressure switch is suitable for use with Class 2 low-voltage power.
- The differential pressure switch is rated for use at a 300 VA pilot duty at 115–277 VAC.
- Size wires according to loads switched by the differential pressure switch.
- The differential pressure switch is pre-set at RenewAire, but we recommend an adjustment to suit each installation.
- A 7/8″ diameter opening is provided in the differential pressure switch case for installation of conduit connector or wire clamp (by others).
- Cover for wiring connections must be re-installed after adjustment of pressure differential.
- When adjusting pressure differential take care not to contact electrical terminals.
OVERVIEW
- To provide a remote indication that a filter in the Energy Recovery Ventilator (ERV) needs replacement, RenewAire offers a filter alarm as an option. The filter alarm is an adjustable differential pressure switch that measures static pressure upstream and downstream of the filter.
- The differential pressure switch is in most cases located inside the ERV unit. Electrical connections from the switch to an alarm or indicator system are made by a qualified control contractor. The installer must make provisions for routing wire into the unit case by local codes.
INSTALLATION
CONNECTING TO THE ALARM SYSTEM
The switch in the filter alarm is a single-pole double throw. When the
differential pressure is less than the setpoint, the switch contacts will be
in the normally closed (NC) position, making a circuit between the common
(“C”) terminal and the “NC” terminal. When the pressure differential becomes
greater than the setting of the switch (adjustable), the switch throws and
makes contact between the “C” and the normally open (NO) contacts.
ADJUSTMENT RANGE OF PRESSURE DIFFERENTIAL SWITCH
The adjustment range of the differential pressure switch is 0.05″–2.0″. The
adjusting knob can be turned approximately 9-3/4 revolutions. To increase the
differential setting, turn the knob clockwise. From a starting position (knob
fully backed out counter-clockwise), the first 4 turns only engage the
tensioning spring and do not change the differential setting. After the first
4 turns, each complete revolution of the adjustment knob changes the pressure
setting by 0.2″.
ADJUSTMENT OF PRESSURE SETTING
The filter alarm is set at RenewAire to 0.5″ differential pressure. This is
appropriate for installations at relatively high airflows, in which the clean
filters have a pressure drop of 0.25″ and the recommended filter loading
imposes another 0.25″ of pressure drop.
Because each system operates at different airflows, we recommend that the
pressure differential be adjusted for each filter alarm AFTER the ERV unit has
been balanced for airflow, using the following procedure:
- Adjust the pressure differential switch to throw at a pressure differential just higher than that of the clean filter.
- With clean filters and all other components in place, operate the ERV.
- If the alarm sounds, the pressure differential setting will need to be increased.
- If the alarm does not sound, the pressure differential setting will need to be decreased.
- Turn off ERV and adjust the differential setting.
- Operate the ERV again, repeating the adjustment procedure until you have determined the highest pressure setting that does not sound the alarm.
- Adjust the pressure differential switch for an additional pressure drop equal to the desired loading of the filter.
- Typical recommended loading for pleated filters is an additional 0.25″.
- Turn the adjustment knob clockwise to increase the pressure setting. Each complete revolution of the adjustment knob changes the pressure setting by 0.2″, so for a 0.25″ setting, turn the knob 1-1/4 times revolutions.
FACTORY ASSISTANCE
- In the unlikely event that you need assistance from the factory for a specific issue with the ERV or its Filter Alarm Option, please call the Customer Service line at the telephone number below. Please have the unit configuration code or serial number on hand to ensure faster service.
- To contact RenewAire Customer Service:
- Call 800-627-4499
- Email: RenewAireSupport@RenewAire.com
- Remember that RenewAire Customer Service can only assist with the ERV and its options, it cannot resolve engineering issues that result from air handling system design by others.