Internal Filter; External Filter; Coils; Door Seals - Greenheck ERCH-20 Installation, Operation And Maintenance Manual

of grease to be used is to fill 30% to 60% of available
space in the bearing and housing.
A high quality lithium based grease conforming to NLGI
Grade 2 consistency should be used.

Internal Filter

The unit will typically be provided with 2-inch thick
pleated paper filters in the airstream. These filters
should be checked according to a routine maintenance
schedule and replaced as necessary to ensure proper
airflow through the unit. Replacement filters shall be of
same performance and quality as factory-installed filters.
Filters upstream of the coil should be checked regularly.
If the filters are dirty, they should be cleaned or
replaced. It is important the filters stay clean to maintain
desired airflow.
Internal Filter Size and Quantities
Filter Size
Model
(inches)
ERCH-20 20 x 20
ERCH-45 20 x 25
ERCH-55 16 x 20
ERCH-90 20 x 20

External Filter

Aluminum mesh, 2-inch thick filters are located in the
supply weatherhood (if the weatherhood
option was purchased). These filters
should be checked and cleaned
on a regular basis for best
efficiency. The frequency of
cleaning depends upon the
cleanliness of the incoming air.
These filters should be cleaned
by rinsing with a mild detergent
in warm water prior to start-up.
External Filter Size and Quantities
Filter Size
Model
(inches)
ERCH-20 16 x 20
ERCH-45 16 x 20
ERCH-55 16 x 20
ERCH-90 16 x 20
®
Quantity Quantity
Supply Exhaust
2 2
3 3
6 6
8 8
External Filter
Access
Quantity
2
4
6
8

Coils

Coils must be cleaned to maintain maximum
performance. Check coils once per year under normal
operating conditions and if dirty, brush or vacuum clean.
Soiled fins reduce the capacity of the coil, demand
more energy from the fan and create an environment
for odor and bacteria to grow and spread through the
conditioned zone.
For coils with fragile fins or high fin density, foaming
chemical sprays and washes are available. Care must
be taken not to damage the coils, including the fins,
while cleaning. Caution: Fin edges are sharp!
WARNING
Biological hazard. May cause disease. Cleaning
should be performed by qualified personnel only.
Drain pans in any air conditioning unit will have some
moisture in them, therefore, algae and other organisms
will grow due to airborne spores and bacteria. Periodic
cleaning is necessary to prevent this buildup from
plugging the drain and causing the drain pan to
overflow. Inspect twice a year to avoid the possibility
of overflow. Also, drain pans should be kept clean to
prevent the spread of disease.
Winterizing Coils
Coil freeze-up can be caused by such things as air
stratification and failure of outdoor air dampers and/
or preheat coils. Routine draining of water cooling coils
for winter shutdown cannot be depended upon as
insurance against freeze-up. Severe coil damage may
result. It is recommended that all coils be drained as
thoroughly as possible and then treated in the following
manner.
WARNING
Carefully read instructions for mixing antifreeze
solution used. Some products will have a higher
freezing point in their natural state than when mixed
with water.
Fill each coil independently with an antifreeze solution
using a small circulating pump and again thoroughly
drain. Check freezing point of antifreeze before
proceeding to next coil. Due to a small amount of water
always remaining in each coil, there will be diluting
effect. The small amount of antifreeze solution remaining
in the coil must always be concentrated enough to
prevent freeze-up.

Door Seals

An EPDM foam rubber bulb seal backed with a high
strength acrylic adhesive is installed on the door frame
of the unit. This creates and air tight seal between the
rubber seal and the door. Inspect at least annually to
ensure that the seal is damage free and still intact.
Energy Recovery Ventilator with Heating and Cooling General Description - NOT model specific 43