MODEL 8635 SUREFLOW™
This product is classified by Underwriters Laboratories, Inc.® for use in through-penetration
firestop systems. See UL fire resistance directory.
Figure 1: Typical Installation
Component List
Part Number Qty Description
800326 1 Pressure sensor
800248 1 Sensor cable
800222 1 Room pressure monitor
800420 1 Transformer
800414 1 Transformer cable
1901057 2 Intumescent ring
2923020 1 Fire sealant
ROOM PRESSURE MONITOR
INSTALLATION INSTRUCTIONS
WARNING: The Model 8635 Room Pressure Monitor must be wired to 24 VAC only. Wiring the unit to
110 VAC will cause serious damage to the unit and void the warranty.
The pressure sensor must be mounted through the wall between the controlled space
(laboratory) and referenced space (hallway).
These installation instructions guide the installer through the installation of the TSI Model 8635 SureFlow™
Room Pressure Monitor. Please read these instructions thoroughly before beginning installation.
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TSI and TSI logo are registered trademarks of TSI Incorporated.
SureFlow is a trademark of TSI Incorporated.
Pressure Sensor Installation
Figure 2: Pressure Sensor Orientation and Mounting Template
WARNING: 800326 pressure sensor must
be mounted through the wall between the
controlled space (laboratory) and
referenced space (hallway), exactly as
shown in Figure 2 and 3.
1. Determine pressure sensor location
(Figures 1, 2 and 3). Pressure sensor
typically mounts in the reference space, and
the dummy housing mounts in the
laboratory.
NOTE: Pressure sensor is not symmetrical.
If sensor is to be centered over hallway
door, measure one inch to the left of center
for 2¼-inch hole. Dummy sensor will be 2”
off center on other side of wall.
2. The pressure sensor must be orientated on
the wall as shown in Figure 2. Looking at
the mounted sensor, sensor hole is on the
left (2¼”) and wire hole is on the right.
3. Drill a 2¼-inch hole through each side of
the wall to accept the sensor tube.
4. Drill a 7/8 inch hole on the side of the wall
that the pressure sensor will be mounted.
This hole is for the six-conductor sensor
cable. Refer to Figure 2 for a hole mounting
pattern.
5. Slide sensor cover to right and remove
screw that holds the sensor base to the
pressure sensor (Figure 2). Remove
pressure sensor and store in a safe place.
6. From the side of the wall the sensor will be
mounted, slide the sensor tube through the
wall. Mark the tube where it is flush with
wall. Remove sensor tube and cut tube
1/8-inch shorter than flush marking.
NOTE: If 12” sensor tube is not long
enough add a 1” to 2” adapter and extend
with 2" OD tube. The base of the dummy
housing will need to be drilled out to
accommodate 2” tube. DO NOT extend
sensor tube with 1” tubing.
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7. From the side of the wall the sensor will be
mounted, slide the sensor tube through the
wall. Slide the dummy base over the end of
the tube. Screw the pressure sensor base
and dummy base to the wall (Figure 3).
10. Install and screw the pressure sensor and
dummy cover onto the bases. Slide covers
to the left to hide the sensor. Finished
installation should look as shown in
Figure 4.
8. Wire the pressure sensor per Figure 7. Run
sensor cable to the room pressure monitor
4” x 4” electrical rough-in box.
9. Insert fire protection sealant (provided)
into 7/8” wire hole to seal.
WARNING: DO NOT touch the sensor
element in the pressure sensor. DO NOT run
wires through the air passage. Doing so will
damage the sensing element.
Figure 3: Cutaway View of Mounted Pressure Sensor
Figure 4: Pressure Sensor Mounting
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Transformer Installation
Figure 5: Transformer Installation
WARNING
Make sure no power is applied
until all wiring is complete.
Follow all applicable electrical
codes, and have qualified
personnel install the
transformer.
NOTE: 115 Volt, single phase,
60 Hertz power source is
required to power the 800420
transformer. If TSI
Transformer is not installed, a
regulated 24 volt, single phase,
60 Hertz power source is
required to power the
controller.
1. Mount a standard 4” 4” 1½” electrical box at a convenient location within 20 feet of
pressure monitor.
2. Run 115 Volt, single phase, 60-Hertz line voltage (115 VAC) to electrical box. Follow all
applicable electrical codes.
3. Connect 115 VAC line voltage HOT wire to BLACK wire on transformer and NEUTRAL wire to
WHITE wire on transformer (Figure 5).
4. Connect the RED wire on 800414 transformer cable to either of the YELLOW wires on the
transformer and the BLACK wire to the remaining YELLOW wire.
5. Screw the transformer to the electrical box.
6. Run transformer cable from the transformer electrical box to the pressure monitor. Have at
least 8 inches of cable coming out of the pressure monitor rough in electrical box before
trimming cable to length.
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Figure 6: Pressure Monitor Mounting
NOTE: Two screws are hidden behind the cover when
full open. The cover will slide to the right approximately
2 inches until a stop is hit. Pull cover to completely
remove from electronics and expose the screws.
Pressure Monitor Installation
Pressure Monitor Rough-in
1. Select the mounting location of the pressure monitor. The construction plans normally show the
mounting location. If no location is specified, then the unit is typically installed as shown in
Figure 1, either in the laboratory or in the hallway.
2. Install a standard double gang electrical box (4” 4”).
3. Slide the pressure monitor cover to the right and remove three screws holding the electronics
to the base (Figure 6). Remove base.
4. Install the base to the 4” 4” electrical box. The base’s “THIS SIDE UP” arrow must be pointing
towards the ceiling.
Pressure Monitor Wiring
WARNING: DO NOT connect more than 24 VAC to any terminal.
DO NOT apply voltage to the RS-485 output or analog output. Severe damage may
occur to the unit if voltage is applied.
1. Remove the connectors from the back of the pressure monitor.
2. Refer to the wiring diagram (Figure 7) for proper wiring installation.
3. If additional options need to be wired, refer to building prints for proper wiring diagram.
4. Plug the connectors back into the pressure monitor.
5. Carefully push the wires into the electrical box and mount the pressure monitor. Install three
screws to hold pressure monitor firmly to base. Install cover and slide left to hide display.
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USA Tel: +1 800 874 2811
UK Tel: +44 149 4 459200
France Tel: +33 1 41 19 21 99
Germany Tel: +49 241 523030
India Tel: +91 80 67877200
China Tel: +86 10 8219 7688
Singapore Tel: +65 6595 6388
WARNING: Monitor must be wired exactly as diagram shows. Making modifications to the wiring
may severely damage the unit.
Figure 7: Wiring Diagram
If you need assistance installing the system, call TSI Customer Service at 651-490-2811 or
800-874-2811.
TSI Incorporated – Visit our website www.tsi.com for more information.
P/N 1980273 Rev. D ©2017 TSI Incorporated Printed in U.S.A.
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