Duct Connections; Electrical Connections; Unit Wiring Sequence; Frost Control - Greenheck MiniCore 5 Installation, Operation And Maintenance Manual

Duct Connections

Examples of good and poor fan-to-duct connections are
shown below. 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,
loud noise and excessive vibrations.
POOR
Length of Straight Duct
GOOD
Recommended Discharge Duct Size and Length
ERV
MiniCore
Blower Size
5
10
10
10
All dimensions are in inches.

Electrical Connections

Before connecting power to the unit, read and
understand the following instructions and wiring
diagrams. Complete wiring diagrams are attached inside
the energy core and filter access panel of the unit.
All wiring should be done in accordance with the
National Electrical Code ANSI/NFPA 70 latest edition
and any local codes that may apply. In Canada, wiring
should be done in accordance with the Canadian
Electrical Code. The equipment must be properly
grounded.
Electrical connections are located below the energy
core and filter access panel . A knock out location is
provided with the unit.
CAUTION
If any of the original wire must be replaced, the
replacement wire must have a temperature rating of at
least 105ºC.
DANGER
High voltage electrical input is required for this
equipment. This work should be performed by a
qualified electrician.
6 MiniCore
Duct Straight Duct
Size Length
9.75 43
9.75 43

Unit Wiring Sequence

1. The unit's nameplate contains the voltage and total
amperage required. The wire supplying power to the
unit should be sized accordingly.
2. The main power line should be connected to the
appropriate terminal blocks.
Power may be routed to the MiniCore through the
knock out under the control center.
3. Refer to the wiring diagrams in this manual or in the
unit for controlling the MiniCore.
Timed Exhaust Frost Control
Extremely cold outdoor air temperatures can cause
moisture condensation and frosting on the energy
recovery core. Timed exhaust frost control is an optional
feature that will prevent/control core frosting.
Timed exhaust frost control includes a timer as well as
a thermodisc that is field-installed in the outdoor air
duct. When timed exhaust frost control is initiated, the
timer will turn the supply blower off. Time exhaust using
default timer setting will shut down the supply fan for
5 minutes every 30 minutes to allow exhaust to defrost
energy core.
Use the Frost Control Test Procedure outlined below for
troubleshooting.
Frost Control Test Procedure
1. Remove power from unit.
2. Jumper the temperature indicating thermodisc in
the unit control center. Thermodisc has a pre-set
temperature of 5ºF.
3. Set the frost control timer scale for T1 and T2 to 1m.
Set the timer settings for T1 and T2 to 10.
4. Add power to the unit. Blower should cycle on for one
minute, then turn off for one minute.
5. Remove power from unit
and remove jumpers that
were placed. Reset timer
settings.
• T1 timer setting set to
5 and timer scale set
to 10m for 5 minutes
of wheel off time.
• T2 timer setting set to
5 and timer scale set
to 1h for 30 minutes of
wheel on time.
Timer
Scale
T1
Timer
Settings
T2
Timer
Scale
®