Electrical Connections; Vdc Wiring; Accessories; Interlock Relay - Carrier HRVCCLHU Installation, Start-Up, And Operating Instructions Manual

WALL CONTROL
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CONTROL
Fig. 12---Control Connections
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All electrical connections must comply with National and Local
Electrical Codes, or other ordinances that might apply.
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Do not use an extension cord as a power source for operating
the HRV.
Step 2--12-vdc Wiring
The HRV circuit board, wall control, and accessories operate on
12vdc. See Wall Control section, item Wiring and Fig. l I and 12
for more information.
ACCESSORIES
Step l_nterlock Relay
The interlock relay kit, Part No. KVAAC0101FIR is required
when installing HRV into a forced-air heating and cooling system.
(See Fig. 13.) For additional information, refer to Installation
Iustructions supplied with interlock relay kit.
The purpose of interlock relay kit is to energize indoor system
equipment (furnace or fan coil) blower whenever HRV is calling.
If HRV is energized, and indoor system equipment is not, interlock
relay will energize and make R and G at indoor equipment. This
will insure fresh air distribution throughout the building via the
central duct system.
Step 2--20 Minute Timer
A push button timer can be used to override the wall control and
put the HRV into high speed for 20 minutes. Connect switches in
parallel and connect leads to HRV terminals 1, OC, and OL. (gee
Fig. 14.) Push button locations are ideal in special activity areas,
such as, bathrooms or kitchen, where high-speed exhaust operation
is needed for a short period of time.
NOTE: The 20 minute timer will not function properly unless
HRV wall control is applied and working correctly. Timing
function is internal to electronic circuit board, it is activated by a
momentary contact between OC and OL. The 1 connection is to
illuminate the push button. The maximum number of push button
timers that can be applied is 5.
Step 3--60 Minute Adjustable Timer
A 60 minute adjustable timer can also be used to override wall
control and put HRV into high-speed operation for a select amount
of time. Connect timer in parallel with push button timers, or to
HRV terminals OC and OL. (See Fig. 14.)
The 60 minute timer will provide a minimum of 30 minutes, and
a maximum of 80 minutes of ventilation at high speed. When
adjustable timer expires, an additional 20 minutes will remain as a
result of the internal timer of HRV electronic circuit board.
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