1.800.627.4499
24
HE-Series Outdoor
ERV
INSTALLATION
5.5.4 Control System Sending two 24 VAC “On” Signals (from an external power source)
Use Figure 5.5.3 only if the ERV has Independent Blower Control:
u
Make sure the jumper is NOT installed between Terminals 2 and 3.
Now you safely can apply one of the 24 VAC signals to Terminals 3 and 4 to operate the ERV’s
isolation relay for the Fresh Air Blower. Apply the second 24 VAC signal to Terminals 3 and 5 to
operate the ERV’s isolation relay for the Exhaust Blower (make sure the polarity of each wire
connected to Terminal 3 is the same).
FIGURE 5.5.3 TWO EXTERNAL RELAY CONTACTS SUPPLYING 24 VAC FROM AN EXTERNAL SOURCE
Supply only 24 VAC (not
VDC) from a Class II Power
Source.
CAUTION
UNIT INTERNAL CONTROL WIRING
C
Isolation Relay Coil (Fresh Air)
(SIMPLIFIED)
TWO EXTERNAL RELAY CONTACTS
SUPPLYING 24VAC FROM AN
EXTERNAL SOURCE
1
2
3
4
5
Unit's 24VAC
Power Supply
C
Isolation Relay Coil (Exhaust Air)
Image D from Filename: Control Connections HE1XRT and larger
5-5-2011.dwg
Friedlander
5/5/2011
5.5.5 Control Operating on Unit's 24 VAC Power Supply
Use the schematic shown in Figure 5.5.4 if controls are operating on unit's 24 VAC power
supply.
u
24 VAC power is available at the Terminals 1 and 2.
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Install jumper (provided) between terminals 2 and 3.
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Connect the switched output of the Control to Terminal 4 to operate the ERV’s isolation relay.
FIGURE 5.5.4 AN EXTERNAL CONTROL USING UNIT'S 24 VAC POWER SUPPLY
External control system
should not draw more than
8 VA.
CAUTION
Unit's 24VAC
Power Supply
Connect Terminals 2 & 3
UNIT INTERNAL CONTROL WIRING
C
Isolation
Relay Coil
(SIMPLIFIED)
AN EXTERNAL CONTROL USING UNIT'S
24VAC POWER SUPPLY
1
2
3
4
5
MPU
24VAC Available at Terminals 1 & 2
image E from Filename: Control Connections HE1XRT and larger
5-5-2011.dwg
Friedlander
5/5/2011
5.5.6 Control on Separate Power Supply
Use this schematic only if no power is present at the controls output terminals.
u
Install jumper at terminals 2 and 3.
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Connect the Control’s Normally Open (N.O.) contacts to terminals 1 and 4.
See Wiring Schematics.
5.5.7 Control System on Separate Power Supply; Independent Blower Control
Use this schematic only if no power is present at the controls output terminals.
u
Install jumper at terminals 2 and 3.
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Connect one of the Control’s (N.O.) contacts to terminals 1 and 4 to operate the ERV’s
isolation relay for the Outside Air (OA) Blower.
u
Connect another of the Control’s (N.O.) contacts to terminals 1 and 5 to operate the isolation
relay for the Exhaust Air (EA) Blower.
See Wiring Schematics.
