Tjernlund COP2 Constant Operating Pressure Exhaust Control 8504208 - Manual (Page 5)

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PRESSURE SENSING TUBE INSTALLATION
1. Follow sensing tube location recommendations on page 3.
Use a sharp drill bit to reduce burr, drill a 1/4" hole for pressure
sensing tube. Screw sensing tube bracket to duct/chase with
sampling hole centered, (See Diagram C).
2. Insert stainless steel sensing tube through 1/4" hole enough to
just penetrate interior of duct/chase and lock in place with
compression ferrule and nut, (See Diagram C).
PRESSURE TRANSDUCER MOUNTING AND TUBING CONECTION
Using the key hole slots on the back of the Pressure Transducer junction box
as a template, mark (2) holes on the mounting surface, drill 1/4” pilot holes for
wall anchors if necessary, and secure junction box using provided screws.
Using the included flexible tubing connect the sensing tube to the barbed port
on the exterior of the Pressure Transducer junction box. Excessive additional
lengths of tubing will delay the response of the VFD which can lead to control
lag, (See Diagram D).
SYSTEM TEST PROCEDURE
When used in conjunction with oil or gas fired heating equipment follow
the interlock test procedure outlined within the CIC1 installation instruc-
tions.
After wiring is complete with supply power switched on and the COP2
Activation terminals C1 & C2 closed with a switch or jumper start the
Exhaust Fan. The fan should begin to operate and maintain the factory
set point of -0.10” W.C. Disconnect the sensing tube from the barbed fit-
ting on the Transducer electrical box. The fan should ramp to full speed.
Reconnect the tube. The fan should slow down to the original speed.
This change in fan performance can be demonstrated by viewing a draft
gauge that is teed into the tubing from the Pressure Transducer, (See
Diagram E). Draft gauge should be connected as close as possible to
COP2 Transducer to achieve a reading on draft gauge similar to COP2
Transducer.
WIRING
The COP2 must be wired by a qualified installer (an individual properly licensed and/or trained) in accordance with these instructions and
in accordance with all local codes or in their absence, with the current editions of NFPA 70, National Electrical Code in the U.S. or CSA
C22.1-12 Canadian Electrical Code in Canada.
All wiring from the COP2 to the RT-Series Fan junction box must be appropriate Class 1 wiring as follows: installed in rigid metal conduit,
intermediate metal conduit, rigid non-metallic conduit, electrical metallic tubing, Type MI Cable, Type MC Cable, or be otherwise suitably
protected from physical damage. Transducer wiring should be in metal conduit or utilize shielded cable.
COP2 Control supply power may be switched through a building management system, pressure switch or other 115 VAC switch.
The maximum distance VFD output power from the COP2 to RT-Series Motor is 100 feet. Exceeding this distance can result in undesir-
able COP2 and RT fan operation and possible damage to both the fan and the control.
The maximum distance control signal wire can be ran from the COP2 to Pressure Transducer is 250 feet. Exceeding this distance can
result in lower than desired signal strength. Transducer wiring should be in metal conduit or utilize shielded cable. Non-shielded signal
wiring can be influenced by outside conditions resulting in undesirable operation of the COP2 control.
DIAGRAM C
1/4” STAINLESS STEEL
SENSING TUBE BEND MUST
FACE UPWARD
COMPRESSION FERRULE
COMPRESSION NUT
SAMPLING PORT CENTERED
OVER 1/4” HOLE
DIAGRAM E
TO PRESSURE SENSING
TUBE IN VENT COMMON
MANIFOLD
TO DRAFT GAUGE
CONNECT HERE WHEN
USED FOR SETUP OR
IF PERMANENTLY
INSTALLED.
DIAGRAM D
TO PRESSURE SENS-
ING TUBE IN VENT
COMMON MANIFOLD
WARNING
!