S&P TRC1200 Installation, Operation & Maintenance Manual page 15

OBSERVE THESE LIMITS TO WIRE LENGTH AND GAUGE
in order to ensure reliable operation of the control system.
Wire Gauge #22
Circuit Length
100'
"Circuit Length" is distance from ERV to control device.
CONTROL WIRING SCHEMATICS
CONTROL WIRING EXAMPLES BY TYPE OF APPLICATION
A. Single 2-wire Control, Unpowered:
Use schematic below if the control requires no power from the unit to operate and acts like a simple
on/off switch. The control must not supply any power to the ERV unit. Install jumper (provided)
between terminals 2 and 3. Connect the control's contacts to terminals 1 and 4 to operate the ERV's
Isolation Relay for OA/SA Blower. Install jumper between terminals 4 and 5 to operate the ERV's
Isolation Relay for the RA/EA Blower.
Single 2-wire Control on Separate Power Supply, No Power Present at Control Output:
Wire as shown for the Single 2-wire control (A. above).
A SWITCH OR NON-POWERED
CONTROL USING UNIT'S 24VAC POWER
SUPPLY
Connect Blue & First Yellow Leads
Connect Switch between Red &
Second Yellow Leads
Image 1 from filename Control Connections EV450-HE1XIN_DEC14
KMC 12/11/14
FIGURE A SWITCH OR NON-POWERED CONTROL USING UNIT'S 24VAC POWER SUPPLY
B. Control Sending 24VAC "On" Signal (from an external power source) to ERV: Make sure the blue
and red leads are separately capped and not connected to any other wires. Now you safely can
apply 24VAC to the two yellow leads to operate the ERV's isolation relay.
24VAC FROM AN EXTERNAL SOURCE
Cap Blue and Red Leads when using
24VAC from external source.
Image 3 from filename Control Connections EV450-HE1XIN_DEC14
KMC 12/11/14
FIGURE B 24VAC FROM AN EXTERNAL SOURCE
®
#20 #18 #16
150' 250' 400'
UNIT INTERNAL CONTROL WIRING
(SIMPLIFIED)
BLUE
Isolation
YEL
C
Relay Coil
YEL
RED
UNIT INTERNAL CONTROL WIRING
(SIMPLIFIED)
BLUE
Isolation Unit 24VAC
YEL
C
Relay Coil Power Supply
YEL
RED
SOLERPALAU-USA.COM INSTALLATION, OPERATION AND MAINTENANCE MANUAL
TRC1200
#14 #12
700' 1000'
Unit 24VAC
Power Supply
INSTALLATION
ERV
NOTE: The simplified
schematics below
show only the relevant
portions of the low-voltage
control circuit in the ERV
unit and representational
external control approaches.
See the complete unit wiring
schematics elsewhere in
this manual.
CAUTION
External control system should
not draw more than 8VA.
15