Greenheck TSU Base Unit Manual (464441) - Manual (Page 11)

Make-Up Air Unit 11
®
Installation of Building Pressure
Control (optional)
1. Mount Pressure Tap
Using the factory-provided bracket, mount the pressure
tap to the outside of
the unit. Choose a
location out of the
prevailing winds and
away from supply
or exhaust fans to
assure accurate
readings.
2. Run Pressure Tap Lines
Run a pressure tap line from the pressure tap on the
outside of the unit to the low pressure tap on the back
of the photohelic gauge. Run a second pressure tap line
from the high pressure tap on the back of the photohelic
gauge to the space. Fifty feet of tubing is supplied with
the unit.
3. Set the Building Pressure
The pressure gauge is used to set the desired building
pressure.
The pressure is set by adjusting the knobs for the upper
and lower pressure limits.
Connections for Photohelic Gauge
Factory
Wiring
High Pressure
Tap
to space
Low Pressure
Tap
to outside
Typical Photohelic Gauge
Pressure Indicating Needle Pressure Setting Needles
Pressure Setting Knobs
Installation of Dirty Filter Switch
(optional)
To adjust the switch, the unit must be running with all of
the access doors in place, except for the compartment
where the switch is located. The adjusting screw is
located on the top of the switch.
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 pressure on the
blower side of filters)
Positive pressure connection is toward the 'back or bottom'
of the switch. (Senses pressure at the inlet side of filters)
1. Open the filter compartment and place a sheet of
plastic or cardboard over 50% of the filter media.
2. Replace the filter compartment door.
3. Check to see if there is power at the alert signal
leads (refer to electrical diagram).
4. Whether there is power or not, turn the adjustment
screw on the dirty filter gauge - clockwise if you did
not have power, counterclockwise if you did have
power - until the power comes on or just before the
power goes off.
5. Open the filter compartment and remove the
obstructing material.
6. Replace the door and check to make sure that you
do not have power at the alert signal leads. The
unit is now ready for operation.