Rail Mounting/Layout; Duct Connections - Greenheck ERCH-20 Installation, Operation And Maintenance Manual

Rail Mounting / Layout
1. Rails designed to handle the weight of the unit
should be positioned as shown on the diagram (rails
by others).
2. Make sure that rail positioning does not interfere with
the supply air discharge opening or the exhaust air
intake opening on the unit. Avoid area dimensioned
"B" below.
3. Rails should run the width of the unit and extend
beyond the unit a minimum of 12 inches on each
side.
4. Set unit on rails.
B
Rail Mounting
Unit Size
ERCH-20
ERCH-45
ERCH-55
ERCH-90
All dimensions are in inches.
Ductwork Connections
Examples of poor and good fan-to-duct connections
are shown. Airflow out of the fan should
be directed straight or curve the
same direction as the
fan wheel rotates. Poor
duct installation will result
in low airflow and other
system effects.
Length of Straight Duct
GOOD
Inlet/Outlet Descriptions
Code Description
OIE Outdoor Air Intake End
OIT Outdoor Air Intake Top
RIE Return Air Intake End
RIS Return Air Intake Side
RIB Return Air Intake Bottom
RIT Return Air Intake Top
SDE Supply Discharge End
®
A
A B
5.0 41.0
7.0 41.9
5.5 53.0
6.0 59.0
POOR
Code Description
SDT Supply Discharge Top
SDT/IG Supply Discharge Top w/IG
SDS Supply Discharge Side
SDB Supply Discharge Bottom
EDE Exhaust Discharge End
EDT Exhaust Discharge Top
EDS Exhaust Out Side
ERCH-20
Intake Duct Size Discharge
OIE 22 x 26 SDE
OIT 24 x 20 SDS
RIE 16 x 32 SDT
RIS 18 x 30 SDT/IG
RIB 16 x 32 SDB
RIT 16 x 32 EDE
EDT
EDS
ERCH-45
Intake Duct Size Discharge
OIE 28 x 36 SDE
OIT 34 x 24 SDS
RIE 24 x 40 SDT
RIS 26 x 32 SDT/IG
RIB 20 x 48 SDB
RIT 28 x 30 EDE
EDT
EDS
ERCH-55
Intake Duct Size Discharge 12-12 Blower 15-15 Blower
OIE 32 x 52 SDE
OIT 40 x 28 SDS
RIE 30 x 40 SDT
RIS 30 x 38 SDT/IG
RIB 20 x 54 SDB
RIT 30 x 40 EDE
EDT
EDS
ERCH-90
Intake Duct Size Discharge 15-15 Blower 18-18 Blower
OIE 34 x 64 SDE
OIT 34 x 50 SDS
RIE 32 x 60 SDT
RIS 40 x 40 SDT/IG
RIB 22 x 74 SDB
RIT 40 x 40 EDE
EDT
EDS
All dimensions shown in inches.
• Recommended duct sizes are based on velocities across the cfm
range of each model at approximately 800 feet per minute (FPM) at
minimum airflow and up to 1600 fpm at maximum airflow.
• Recommended duct sizes are only intended to be a guide and
may not satisfy the requirements of the project. Refer to plans for
appropriate job specific duct size and/or velocity limitations.
Energy Recovery Ventilator with Heating and Cooling General Description - NOT model specific
Recommended Duct Size
9-9 Blower 10-6 Blower
16 x 16 16 x 16
16 x 16 16 x 16
16 x 16 16 x 16
28 x 24 28 x 24
12 x 14 12 x 14
16 x 16 16 x 16
16 x 16 16 x 16
16 x 16 16 x 16
Recommended Duct Size
12-8 Blower
9-9 Blower
12-12 Blower
20 x 20 16 x 16
20 x 20 16 x 16
20 x 20 16 x 16
28 x 28 28 x 28
16 x 18 16 x 18
20 x 20 16 x 16
20 x 20 16 x 16
20 x 20 16 x 16
Recommended Duct Size
20 x 20 28 x 28
20 x 20 28 x 28
20 x 20 28 x 28
38 x 30 38 x 30
16 x 18 18 x 20
20 x 20 28 x 28
20 x 20 28 x 28
20 x 20 28 x 28
Recommended Duct Size
28 x 28 32 x 32
28 x 28 32 x 32
28 x 28 32 x 32
34 x 34 34 x 33
18 x 20 20 x 24
28 x 28 32 x 32
28 x 28 32 x 32
28 x 28 32 x 32
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