Specifications, Maintenance, Safety information – Fieldpiece DDSM1 - Draft Simulator User Manual

Page 2: Limited warranty, Obtaining service, Calibrate an adjustable pressure switch, Test a pressure transducer, Warnings

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.

www.fieldpiece.com