Product Overview; Optional Subassemblies - Greenheck ERCH-20 Installation, Operation And Maintenance Manual

Product Overview

The model ERCH combines the benefits of energy
recovery and many combinations of supplemental
heating and cooling. Heating sources include indirect
gas, electric, hot water, and water-source heat pump.
Cooling sources include, packaged direct expansion,
split direct expansion, chilled water, and water-source
heat pump. Indirect evaporative and indirect/direct
evaporative cooling is also available in this platform.
This product is specifically designed to process 100%
outdoor air to desired supply conditions. Four housing
sizes provide air flow capacities from 1,000 CFM to
10,000 CFM with external static pressures up to
1.75 in. wg.
Model
Water-Source
Heat Pump
ERCH-20 4, 5, 6, single stage
ERCH-45 8, 10, 12.5, 15
ERCH-55 15, 17.5, 20
ERCH-90 20, 25, 30

Optional Subassemblies

Dampers
There are four locations where dampers can be
installed. Low leakage or insulated low leakage
motorized dampers can be added in the outdoor
airstream and/or return airstream. An unoccupied
recirculating air damper is also available. A backdraft
damper is standard in the exhaust hood.
Filters
There is the option of either two-inch thick MERV 8
or MERV 8 and 13 pre-filters in the outdoor airstream
and MERV 8 filters in the exhaust airstream. There are
also permanent washable aluminum mesh filters in the
optional weatherhood.
Backdraft
Exhaust Damper
Two-inch thick MERV 8
Exhaust
Weatherhood
Permanent
Aluminum
Mesh Filters
Motorized Outdoor
Air Damper
Two-inch thick MERV 8 or MERV
8 and 13 pleated filters
4 General Description - NOT model specific Energy Recovery Ventilator with Heating and Cooling
Tons
Packaged Direct
Expansion
4, 5, 6, 7 single stage
8, 10, 11, 12.5, 14
15, 16, 19
20, 22, 24, 27, 30
pleated filters
Motorized Return Air
Damper
Electrical Box
Return Air
Intake
Motorized Recirculating Air Damper
Hot Water / Chilled Water Coils
Water coils can be used for a single purpose such
as heating or cooling, or their function can be
alternated between heating and cooling by changing
the temperature of the water flowing through the coil.
Depending on the application, it may be necessary to
use a glycol mixture to prevent the liquid from freezing.
The water coils are engineered to operate at pressures
up to 250 PSIG and temperatures up to 300°F, but
ancillary equipment such as valves and pumps will often
dictate lower operating temperatures. All water coils
are pressure tested at the factory with 450 PSIG of dry
nitrogen.
Steam Coils
Steam coils are used for heating applications and are
built to operate at pressures of up to 125 PSIG with
a maximum temperature of 353°F. They are pressure
tested with 600 PSIG of dry nitrogen. The most frequent
use of steam coils is for retrofitting or modifying existing
steam heat systems.
Evaporative Cooler
Evaporative cooling modules
include Munters® CELdek®
media (GLASdek® optional)
and a stainless steel frame.
Evaporative cooling media is
12 inches in depth and capable
of 90% cooling effectiveness.
A cooling module in the
exhaust airstream for indirect
evaporative cooling is
standard. For combination
indirect and direct evaporative cooling, an evaporative
section may also be added to the outdoor air stream.
Optional features include an automatic drain and fill with
freeze protection.
Packaged Direct Expansion (PDX)
The DX system comes fully charged from the factory
with refrigerant and is ready for installation upon arrival.
The smaller tonnage units (4-7 tons) contain a single
compressor, allowing for one stage of cooling. Larger
units (8-30 tons) come standard with two compressors
This allows for staging of compressors to meet a wider
range of outdoor air loads with reducing the amount of
cycles per compressor.
Integral Components
All units are provided with an expansion valve, hermetic
scroll compressor(s), liquid line filter drier, high pressure
manual reset cutout, low pressure auto-reset cutout,
time delays for compressor protection, service/charging
valves, moisture indicating sight glass, and optional hot
gas bypass. The compressors also come standard with
a crankcase heater for additional protection.
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