Reznor YDSA Unit Installation Manual - Manual (Page 34)

Form I-Y, P/N 273646R6, Page 34
Pickup Tube
for Duct work,
Option VFC3,
P/N 234821
2. Pickup Tube Locations
Duct Static (Option VFC3) Pickup Tubes - Mount the pickup tube shipped with
the unit approximately 2/3 down the length of the duct work (minimum of 10 duct
lengths). At the selected location, drill a 7/16” hole in the side of the duct. Insert the
pickup tube being sure that it is centered in the hole and attach with two #8 sheet
metal screws. Check to be sure that the hole is sealed. Connect tubing from the
sensor in the duct to the “high” connection on the transducer.
To sense atmospheric pressure, route the tubing from the “low” connection on the
transducer to one of the small holes in the cabinet panel and install a field-supplied
pickup tube designed for outdoors.
Building Pressure Control (Option VFC4) Pickup Tubes - Both pickup tubes
for building pressure control are field supplied. Install a pickup tube in the building.
To sense atmospheric pressure, route the tubing to one of the small holes in the
cabinet panel and install a field-supplied pickup tube designed for outdoors.
As determined by the application, attach the tubing from the positive (high)
pressure pickup to the “high” connection on the transducer and the reference (low)
pressure pickup tube to the “low” connection on the transducer.
3. Verify Installation and Operation - Be sure that tubing connections are correct
and attached securely. On startup, verify that there is a pressure reading displayed
on the unit controller.
Option BD5,
Firestat
(200°F),
P/N 42782
The firestat is for field installation in either the return
air or outlet air duct work. Follow instructions supplied
with the control. Comply with local building codes.
See Paragraph 7.5.3 for wiring requirements and
connections.
Option BD5, Firestat 8.3 Other Optional
Controls
Option BE18 or BE28,
Dirty Filter Switch
If dirty filter indicator Option BE18 was ordered, a dirty filter switch is in the electrical
compartment with tubing sensors placed on either side of the supply filters. If dirty
filter indicator Option BE28 was ordered, two dirty filter switches are in the electrical
compartment with tubing sensors placed on either side of the supply air filters and the
energy recovery wheel filters.
The pressure switch(es) are in the low voltage electrical compartment. Follow the
instructions in FIGURE 20, shown below to set the dirty filter switch.
NOTE: See Tubing Color
Chart on page 26.
FIGURE 20 - Dirty Filter Switch, P/N 105507
Setscrew (on front of
switch) must be manually
adjusted after the system
is in operation.
Negative pressure
connection is toward the
"front or top" of the switch
(senses blower side of filters)
Positive pressure
connection is toward
the "back or bottom"
of the switch (senses
air inlet side of filters)
Instructions for Setting Dirty Filter Switch
With clean filters in place; all doors closed
(except electrical compartment); and the blower
operating, navigate to Digital Input Screen C.9
which shows point DI02 Filter_Sts.
Increase the pressure setting by adjusting the
setscrew on the switch clockwise until the filter
status value is reading OFF. At this point, adjust
the setscrew three full turns counterclockwise.
At this setpoint, the filter light will be activated at
approximately 50% filter blockage.
Option BE15, Space
CO2 Sensor
Field installed in the space, the sensor (P/N 234820) has a range of 0-2000 ppm. Fol-
low the manufacturer’s instructions for installation. Refer to Paragraph 7.5.3 for wiring
requirements and connections.
Option BE17,
Photoelectric Duct
Smoke Detector and
Sampling Tube
The photoelectric smoke detector ( P/N 159553)
used in Option BE17 is field mounted on the
duct work. Follow the manufacturer's installation
instructions. See Paragraph 7.5.3 for sensor
wiring requirements and connections.
NOTE: Tubing is field
supplied.
8.0 Controls (cont'd)
8.2 Supply Fan Control (cont’d)