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Calibrate an Adjustable Pressure
Switch
1. IMPORTANT: Be sure to use an adjustable
pressure switch that will calibrate to the
pressure rating of the pressure switch that
is being changed out. Connect leads to the
front jacks of the DRAFT SIMULATOR. Connect
the leads to the normally open and common
terminals on the pressure switch. It does not
matter which lead goes to which terminal.
2. Connect both hoses to the ports on the top
of DRAFT SIMULATOR. Connect one hose to
the negative side of the adjustable pressure
switch and connect the other hose to the
manometer. It does not matter which hose
is connected to which port.
3. IMPORTANT: Before starting the DRAFT
SIMULATOR ensure the pressure dial is
completely open by turning the dial
counter-clockwise as far as it will go.
Turn on and "zero" your manometer.
Note the DRAFT SIMULATOR has two major
speeds to accommodate different pressure
switch ratings – a low speed and a high
speed. The speeds are accessed alternately
by pressing the switch multiple times:
OFF – HIGH – OFF – LOW
4. Turn on the DRAFT SIMULATOR. It is a good
idea to start the DRAFT SIMULATOR in high
speed to warm-up the motor for 10 seconds.
5. Set the DRAFT SIMULATOR to the speed
needed to calibrate the adjustable pres-
sure switch. Use low speed to calibrate an
adjustable pressure switch rated between
-0.10inWC and -1.50inWC. Use high speed to
calibrate an adjustable pressure switch rated
between 1.50inWC to 12.00inWC.
6. IMPORTANT: An adjustable pressure switch
must open at the desired pressure. Adjust the
pressure dial on the DRAFT SIMULATOR until
the desired pressure is reached as indicated
on the manometer.
If LED is OFF (switch is closed)– Slowly loosen the
adjustment screw on the adjustable pressure
switch until the LED light turns ON.
If LED is ON (switch is closed) – Slowly tighten
the adjustment screw on the adjustable pres-
sure switch until the LED light turns OFF. The
adjustable pressure switch is now calibrated
within manufacturer’s specifications.
Note: Pressures may slightly fluctuate during
adjustments. You can fine tune an adjustable
pressure switch by “closing the gap”. Slightly
increase or decrease the pressure on the
DRAFT SIMULATOR and tighten or loosen
the adjustment screw on the switch until the
switch is opening exactly at the desired rating.
Note: When testing a "Dual Pressure Switch"
it is only necessary to test the negative side
as this switch only has one spring and one
diaphragm similar to any negative pressure
switch.
Test a Pressure Transducer
1. Connect one hose to the low side of the trans-
ducer the other hose to a manometer.
2. Connect a voltage meter to the transducer's
terminals.
3. As you increase the vacuum, the voltage
across the terminals will change based on
the transducer's rating. Compare observed
voltage to rated voltage to determine the
health of the switch.
Specifications
Operating environment:
32°F to 118°F (0°C to 48°C) at <80% RH
Storage temperature:
-4°F to 140°F (-20°C to 60°C), 0 to 80% RH
(with battery removed)
Power:
4 x AA batteries
Battery life:
approx 15 hours typical alkaline (7 hrs on high speed)
Maintenance
Clean the exterior with a dry cloth. Do not
use liquid.
Safety Information
The Pressure Switch is a safety device that
prevents the furnace from running in an unsafe
condition. An unsafe condition can result in
injury, loss of property or even loss of life.
1. Before every use, check the DRAFT SIMULA-
TOR and the tubing for breaks or blockage.
Check the tubing for any moisture as well.
2. Check for the presence of water in the pres-
sure switch before using the draft simulator.
Do not use the draft simulator on a pressure
switch that has water in it. Water can damage
the DRAFT SIMULATOR and VOID the war-
ranty. Check the tubing for moisture build-up
as well.
3. The DRAFT SIMULATOR is designed to pro-
duce a precise amount of negative pressure.
Always use a manometer that is properly
calibrated. Using a manometer that is out of
calibration will give you incorrect readings.
4. Fieldpiece is not responsible for incorrect
readings by faulty test equipment or un-
trained personnel.
5. In the interest of Safety, the DRAFT SIMULA-
TOR should only be used by trained, com-
petent professionals who understand the
hazards and consider the risks of working on
and with tools and equipment.
6. The pressure rating for the pressure switch is
either stamped on the pressure switch or on
a sticker attached to the pressure switch. Oth-
erwise, contact the vendor or manufacturer
of the furnace to get that information.
7. Fieldpiece is not liable for any damages in-
curred by the misuse of the DRAFT SIMULA-
TOR.
Note: Pressure switches have a rating of “(pres-
sure) WC PF”. This means that it is a (pressure)
in inches of Water Column on Pressure Fall.
Example: A -0.40 WC PF rating would mean
that it should open at a negative 0.40 inches
of water column. The pressure switch should
close and more importantly “open” within
10% of the manufacturer’s rating.
!
WARNINGS
!
Turn off power to furnace prior to testing
to avoid low voltage shorting.
If the pump stops while adjusting the
pressure dial, immediately turn CCW to allow
more airflow. The bleed port on the pressure
switch may be blocked or you may need to
use a different speed.
Limited Warranty
In the USA, this instrument is warranted
against defects in material or workmanship for
one year from date of purchase. Fieldpiece will
replace or repair the defective unit, at its option,
subject to verification of the defect.
This warranty does not apply to defects
resulting from abuse, neglect, accident,
unauthorized repair, alteration, or unreasonable
use of the instrument.
Any implied warranties arising from the sale of
a Fieldpiece product, including but not limited
to implied warranties of merchantability and
fitness for a particular purpose, are limited to
the above. Fieldpiece shall not be liable for loss
of use of the instrument or other incidental or
consequential damages, expenses, or economic
loss, or for any claim of such damage, expenses,
or economic loss.
State laws vary. The above limitations or
exclusions may not apply to you.
Obtaining Service
In the USA, call Fieldpiece Instruments for
one-price-fix-all out of warranty service pricing.
Send check or money order for the amount
quoted. Send the meter freight prepaid to
Fieldpiece Instruments. Send proof of date and
location of purchase for in-warranty service.
The meter will be repaired or replaced, at the
option of Fieldpiece, and returned via least
cost transportation. Outside of the USA, please
visit www.fieldpiece.com for service contact
information.
