Energy Recovery Ventilator Maintenance - Bard I30A1DA Installation Instructions Manual

Temperature and barometric pressure
measurements can be displayed in US
engineering units or SI engineering units. The
factory default is to display US engineering
units.
US units F for temperature and in Hg for
barometeric pressure
SI units C for temperature and hPa for
barometric pressure
COL CO low output range
2
Sets the CO concentration for the lowest
2
output (4 mA or 0 VDC).
Low limit: 0 PPM
Factory setting: 0 PPM
High limit: 2000/5000 PPM (depending on
model)
COH
CO high output range
2
Sets the CO concentration for the highest
2
output (20 mA, 5 VDC or 10 VDC). When
COH is set above COL, the transmitter is direct
acting and the output will increase with an
increase in CO level. When COH is below
2
COL, the transmitter is reverse acting and the
output will increase with a decrease in CO
level.
Low limit: 0 PPM
Factory setting: 2000/5000 PPM (depending
on model)
High limit: 2000/5000 PPM (depending on
model)
TOL Temperature low output range
Sets the temperature for the lowest output
(4 mA or 0 VDC).
Low limit: 32.0°F/0.0°C
Factory setting: 32.0°F/0.0°C
High limit: 122.0°F/50.0°C
TOH
Temperature high output range
Sets the temperature for the highest output
(20 mA, 5 VDC or 10 VDC). When TOH is set
above TOL, the transmitter is direct acting
and the output will increase with an increase
in temperature. When TOH is below TOL, the
transmitter is reverse acting and the output
will increase with a decrease intemperature.
Low limit: 32.0°F/0.0°C
Factory setting: 122.0°F/50.0°C
High limit: 122.0°F/50.0°C
BAR Barometric pressure
Sets the typical barometric pressure for the
location where the transmitter is mounted.
The factory setting is for standard pressure at
sea level. Adjusting the barometric pressure
gives a more accurate measurement, especially
at higher elevations.
Low limit: 20.0 in Hg/600 hPa
Factory setting: 29.9 in Hg/1013 hPa
High limit: 32.0 in Hg/1100 hPa
ENERGY RECOVERY VENTILATOR
MAINTENANCE
General Information
The ability to clean exposed surfaces within air moving
systems is an important design consideration for the
maintenance of system performance and air quality.
The need for periodic cleaning will be a function of
operating schedule, climate and contaminants in the
indoor air being exhausted and in the outdoor air being
supplied to the building. All components exposed to
the airstream, including energy recovery wheels, may
require cleaning in most applications.
2
Rotary counterflow heat exchanges (heat wheels) with
laminar airflow are "self-cleaning" with respect to
dry particles. Smaller particles pass through; larger
particles land on the surface and are blown clear
as the flow direction is reversed. For this reason,
the primary need for cleaning is to remove films of
oil-based aerosols that have condensed on energy
transfer surfaces. Buildup of material over time may
eventually reduce airflow. Most importantly, in the
case of desiccant coated (enthalpy) wheels, such films
can close off micron sized pores at the surface of the
desiccant material, reducing the efficiency with which
the desiccant can absorb and desorb moisture.
Frequency
In a reasonably clean indoor environment such as a
school, office building or home, experience shows that
reductions of airflow or loss of sensible (temperature)
effectiveness may not occur for 10 or more years.
However, experience also shows that measurable
changes in latent energy (water vapor) transfer can
occur in shorter periods of time in commercial,
institutional and residential applications experiencing
moderate occupant smoking or with cooking facilities.
In applications experiencing unusually high levels
of occupant smoking, such as smoking lounges,
nightclubs, bars and restaurants, washing of energy
transfer surfaces as frequently as every 6 months may
be necessary to maintain latent transfer efficiency.
Similar washing cycles may also be appropriate for
industrial applications involving the ventilation of high
Manual 2100-597G
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