HVAC Supplies Blog

Posted by Adem Erturk on

HVAC Unit Conversion Factors (incl. Pipe Capacities, Fan Laws and Electrical Units)

Conversion Factors

Electrical units Volts

(E or V) = Amperes (I) x Resistance (R or Ω)

Conductance = Amperes ÷ Volts

Parallel Ω = Rt = 1 ÷ ( 1/R1 + 1/R2 + 1/R3…)

Frequency (hertz) = 1 ÷ Time (seconds)

Power (P) = Volts x Amperes = Watts (W)

Volts x Amperes ÷ 1000 = Kilowatts (KW)

Volts x Amperes ÷ 746 = Horsepower (HP)

Horsepower = .746KW = torque x RPM ÷ 5250

KW Hours = HP x .746 x run hours ÷ efficiency

Cost for time = KW Hours consumed x KW hr. rate

Pipe capacities

Area of a circle = diameter squared x .7854

Circumference = diameter x 3.1416

2 x pipe diameter increases capacity four times

Line capacity (gal.) = area (sq. ) x L ( ) ÷ 231

Velocity

Feet/sec. = 0.408 x GPM ÷ pipe dia. ( ) squared

Area pipe = GPM x 19.2 = cu. ft. H2O x 144 ÷ (ft/min)

Velocity (ft./min.) = 4004 P Velocity pres. (” H2O)

Velocity pressure (” H2O) = (Total-Static) pressure (”H2O)

Fan Laws

CFM varies in direct proportion to RPM

CFM2 ÷ CFM1 = RPM2 ÷ RPM1

Static pressure varies as square root of RPM

SP2 ÷ SP1 = (RPM2 ÷ RPM1)²

Horsepower varies as the cube of the RPM

HP2 ÷ HP1 = (RPM2 ÷ RPM1)³

Fan Static Pressure = SP (outlet) + TP (inlet)

(SP = Static pressure) (TP = Total pressure)

Fan Total pressure = TP (outlet) - TP (inlet)

Conversion Factors

Multiply
By
 To Obtain
Atmospheres
29.92
Inches of Mercury
Atmospheres
14.70 
Lb./sq. in. Absolute
B. T. U. 
778.3
Foot Pounds
B.T.U./min. 
0.02356
Horsepower
B.T.U./min. 
17.57 
Watts
Centimeters 
0.3937 
Inches
Centimeters 
0.01 
Meters
Centimeters
10
Millimeters
Cubic feet 
1728 
Cubic inches
Cubic feet 
0.02832 
Cubic meters
Cubic feet water 
7.4805 
Gallons
Cubic inches 
16.39 
Cubic centimeters
Cubic meters 
35.31 
Cubic feet
Cubic meters 
264.2 
Gallons 
Feet 
30.48 
Centimeters
Feet 
0.3048 
Meters 
Feet/min. 
0.01667 
Feet/sec
Feet/min. 
0.3048 
Meters/sec. 
Feet/sec. 
18.29 
Meters/min.
Gallons 
3785  
Cubic centimeters
Gallons 
231 
Cubic inches
Gallons/min. 
8.0208 
Cubic feet/hr. 
Horsepower 
745.7 
Watts
Inches  
2.54 
Centimeters
Inches of Hg 
0.4912 
Pounds / sq. Inch 
Inches of water 
0.03613
Pounds/sq. Inch
Kilograms 
2.205  
Pounds
Kilometers 
3281 
Feet
Kilometers/hr. 
0.6214  
Miles/hr.
Kilowatt-hours 
3415 
B. T. U.
Liters 
61.02 
Cubic inches 
Liters 
1.057 
Quarts (U.S. liquid)
Meters 
3.281 
Feet 
Meters 
39.37
Inches
Meters/min. 
3.281 
Feet/min. 
Miles 
5280 
Feet
Miles/hr. 
1.609 
Kilometers/hr. 
Ounces
28.35 
Grams
Pounds 
453.6  
Grams
Pounds 
16 
Ounces
Pounds/sq. ft. 
0.01602 
Feet of water 
Pounds/sq. in. 
27.71 
Inches of water
Pounds/sq. in. 
2.036 
Inches of Hg 
Pounds/sq. in.
0.0689 
Bar
Pounds/sq. in.
6.895  
Kilopascals
Pounds/sq. in. 
70.31
Centimeter of water
Pounds/sq. in.
5.771 
Centimeter of Hg 
Square feet 
44 
Square inches
Square inches  
6.452 
Square centimeters
Temp.(OC)+17.8 
1.8 
Temp. ( OF) 
Temp.( OF) -32 
5/9 
Temp. (OC)
HVAC Unit Conversion Factors (incl. Pipe Capacities, Fan Laws and Electrical Units)

Electrical units Volts (E or V) = Amperes (I) x Resistance (R or Ω) Conductance = Amperes ÷ Volts Parallel Ω = Rt = 1 ÷ ( 1/R1 + 1/R2 + 1/R3…) Frequency (hertz) = 1 ÷ Time (seconds) Power (P) = Volts x Amperes = Watts (W) Volts x Amperes ÷ 1000 = Kilowatts (KW) Volts x Amperes ÷ 746 = Horsepower (HP) Horsepower = .746KW = torque x RPM ÷ 5250 KW Hours = HP x .746 x run hours ÷ efficiency Cost for time = KW Hours consumed x KW hr. rate Pipe capacities Area of a...

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Posted by Adem Erturk on

What is the Difference Between Single and Double Valve Versions of Analog to Pneumatic Interfaces?

Analog to pneumatic interfaces can be ordered in single valve or dual valve versions.

Single valve

A single valve interface is used when the requirement calls for zero branch line pressure on a loss in power. The branch circuit of this interface utilizes a bleed orifice. This provides a “fail safe” condition for a heating or cooling application (depending on the action of the actuator).

Orifice Color
Device
Orifice Size
 Air Consumption
Chrome
PXP1.3
.010"
73 scim
Copper
PXP5.3
.005"
14 scim
Brass
PXP7.3
.007"
41 scim

 

The exception is the single valve PXP0.3. It consumes no air (has no bleed orifice) but depends on a downstream control device or actuator to bleed the branch line. An application for the PXP0.3 would be in a system with pilot positioners on actuators, or receiver controllers.

Dual valve

The dual valvePXP2.3 interface does not consume air at set point. One valve is the supply to the branch line, and the other valve is for exhausting air on the branch line. An exhaust valve, rather than an orifice, provides a quicker response time in reducing branch line air pressure. The PXP2.3 is used in applications controlling large pneumatic actuators, systems with large branch line air volumes, as for prompt control of outside air damper actuators. When power is lost to the PXP2.3, the branch line is maintained at the last commanded pressure. If you prefer the quick response of the valved branch line, but require fail-safe operation, the PXP2.3FS (FAIL-SAFE) has a normally open (N.O.) exhaust valve and will fail to zero branch line pressure on a power loss.

Volume capacity

ACI’s line of pneumatic interfaces depend on a branch line volume of two inches to operate properly and without oscillation. Use the following formula to calculate line volume for 1/4" O.D. poly tubing:

(tubing length in feet) x .147” = Tubing volume

Total volume can be found by adding the tubing volume to the actuator volume. A common actuator has a volume of approximately three inches, which changes with the amount of pressure applied to the actuator.

Note

The PXP family of pneumatic interfaces have a selectable MANUAL OVERRIDE adjustment and can be factory ordered with a 0-30 psi back-ported gauge (i.e. order PXP2.3G, etc.) mounted on an aluminum manifold. Filtering is integral in the main air brass barb fitting. 

See All PXP Interface Devices

What is the Difference Between Single and Double Valve Versions of Analog to Pneumatic Interfaces?

Analog to pneumatic interfaces can be ordered in single valve or dual valve versions. Single valve A single valve interface is used when the requirement calls for zero branch line pressure on a loss in power. The branch circuit of this interface utilizes a bleed orifice. This provides a “fail safe” condition for a heating or cooling application (depending on the action of the actuator). Orifice Color Device Orifice Size  Air Consumption Chrome PXP1.3 .010" 73 scim Copper PXP5.3 .005" 14 scim Brass PXP7.3 .007" 41 scim   The exception is the single valve PXP0.3. It consumes no air (has no bleed...

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Posted by Adem Erturk on

What is AFP (Analog to Floating Point) Interface?

The AFP is the interface designed to convert an analog signal to a floating point signal, however use of the AAR has some advantages also.

A common use for the AAR interface is to convert an analog signal (voltage or current) into a tri-State or floating point control signal.

The following example illustrates a 0-10 VDC signal from a Building Automation System to the AAR interface, which would in turn modulate a floating Point actuator in a Unit Ventilator.

Use of the AAR provides an adjustable dead band between the two output signals and a choice of normally open or normally closed contacts.

What is AFP (Analog to Floating Point) Interface?

How it works...

0-4 VDC signal range:

When the analog input signal falls below 4 volts, relay 1 (wired NC) is made. This relay is the “decrease" signal output. As the condition is satisfied and the signal increases beyond 4 volts, the relay energizes, and the output is open.

4-6 VDC signal range:

Between these voltage ranges a “null or floating point” control can be obtained and no relay action takes place. Relay 1 & 2 output are open.

6-10 VDC signal range:

As the analog input signal increases above 6 volts, relay 2 (wired NO) energizes. This relay is the “increase” signal output. As the condition is satisfied and the signal falls below 6 volts, the relay de-energizes and contacts open

See All AFP Products

What is AFP (Analog to Floating Point) Interface?

The AFP is the interface designed to convert an analog signal to a floating point signal, however use of the AAR has some advantages also. A common use for the AAR interface is to convert an analog signal (voltage or current) into a tri-State or floating point control signal. The following example illustrates a 0-10 VDC signal from a Building Automation System to the AAR interface, which would in turn modulate a floating Point actuator in a Unit Ventilator. Use of the AAR provides an adjustable dead band between the two output signals and a choice of normally open or...

Read more →


Posted by Adem Erturk on

ACI's EPC and PXP Signal Conversion Interface Devices

ACI's EPC and PXP Signal Conversion Interface Devices

ACI's Interface Devices convert one signal type to another. While many of the devices share similar functions, knowing their differences will help you know the best device for your application:

  1. The Difference Between ACI's EPC and PXP Interface Devices
  2. PXP Product Specifications
  3. EPC Product Specifications
  4. Interface Device Selection Matrix

ACI Interface Devices: The Difference Between EPC and PXP

ACI manufactures an extensive line of Interface Devices designed to solve problems. Many of ACI interface products are used to convert one signal type to another saving you time and money on retrofit projects.

Two such devices are ACI’s EPC and PXP which convert analog signals to pressure outputs. They are perfect for retrofit jobs with dampers or other parts controlled with pneumatic signals.

Watch Tech-Tip Videos on ACI A/PXP and A/EPC products below.

How to Tell the Difference Between ACI's EPC and PXP Interface Devices

2 Valve vs Fail Safe vs Bleed Differences on EPC/PXP

PXP Analog to Pneumatic Output

PXP Analog to Pneumatic Output
The PXP*.3 is an electric to pneumatic transducer which converts an analog electrical input signal to a proportional pneumatic output. The PXP*.3 will automatically modulate its control valve(s) to regulate the branch line pressure to the selected set point as determined by the input signal. The PXP*.3 offers four selectable input ranges which convert to a 0 to 15 psig modulating output (See EPC product for 0 to 20 psig outputs). A 0-5 VDC feedback signal indicating the resultant branch line pressure is also provided. This signal varies linearly with branch pressure (0 volts= 0 psig, 5 volts = 15 psig). The PXP0.3 is a single valve version that does not bleed or exhaust air. Its operation depends on the pneumatic circuit where it is installed to consume between 14 and 73 scim. The PXP1.3, 5.3, and response time determined by the bleed ori ce size and pressure di erentials (see ordering grid on the tinue to bleed through the bleed ori ce until branch pressure is zero psig. A three-way solenoid valve assembly may be used with the bleed type PXP1.3, 5.3, or 7.3 to allow control to fall back to the original local controller if power fails. The PXP2.3 incorporates two valves and does not use air at set point. It’s branch exhaust ow and response time are not limited by an internal restrictor and are similar to its load rate. If power fails to the PXP2.3, branch line pressure remains constant if the branch line does not leak air. The PXP2.3FS is equipped with a N.O. branch exhaust valve which allows exhaust of branch air on power failure. A manual override (jumper selectable), which controls the output pressure, is provided for setup and troubleshooting. Custom calibration is available upon request for an additional charge. This will speed up installation time for the end user.
Applications: Three-Way Mixing Valve Control, Pilot Positioner Control, Pneumatic Valve & Damper Actuator Control, Fan Vane Control, DDC Control, Above Ceiling Applications (mixing and VAV boxes)
The PXP is covered by ACI's Two (2) Year Limited Warranty. The warranty can be found in the front of ACI's Sensors & Transmitters catalog, as well as on ACI's website, www.workaci.com.
PRODUCT SPECIFICATIONS
Supply Voltage:
24 VAC (+/-10%), 50 or 60Hz, 24 VDC (+10%/- 5%)
Supply Current:
160 mA maximum, 200 mA on fail safe models
Input Signal Source (@ Impedance):
0-5 VDC @ 10,000 0-10 VDC @ 10,000 0-15 VDC @ 10,000 0-20 mA @ 250
Feedback Signal Output Range:
0-5 VDC = Output Span
Output Pressure Range:
Field Calibration Possible: 0 to 15 psig (0-103.421 kPa) maximum
Air Supply Pressure:
Maximum: 25 psig (172.369 kPa) | Minimum: 18 psig (124.106 kPa)
Air Consumption:
See Ordering Grid
Output Pressure Accuracy:
1% full scale @ room temperature | 2% full scale across operating temperature range
Manual / Auto Override:
MAN function = output can be varied | AUTO function = output is controlled from input signal
Air Flow:
Supply valves @ 20 psig (138 kPa) main/15 psig (103 kPa) out, 750 scim (1400 on LG model)
Branch Line requires 2 in or 33.78 cm (min.). Branch line min. of 25 feet of 1/4” O.D. poly tubing
Filtering:
Furnished with integral-in-barb 80-100 micron lter (Part # PN004) except for PXP2LG which is
furnished with external 5 micron in-line lter (PN021)
Connections:
90° Pluggable Screw Terminal Blocks
Wire Size:
16 (1.31 mm ) to 26 AWG (0.129 mm )
Terminal Block Torque Rating:
0.5 Nm (Minimum); 0.6 Nm (Maximum)
Connections | Pneumatic Tubing Size-Type:
1/4" O.D. nominal (1/8” I.D.) polyethylene
Pneumatic Fitting:
Removeable brass barbed fittings for Main and Branch in machined aluminum manifold
Plugged 1/8-27-FNPT gauge port | Gauge installed at additional cost
Gauge Pressure Range (Gauge Models):
0-30 psig (0-200 kPa)
Gauge Pressure Accuracy (Gauge Models):
± 2.5% Midscale (± 3.5% Full Scale)
Operating Temperature Range:
35 to 120°F (1.7 to 48.9°C)
Operating Humidity Rage:
10 to 95% non-condensing
Storage Temperature:
-20 to 150°F (-28.9 to 65.5°C)
Snaptrack Material:
Polyvinyl Chloride (PVC)
Snaptrack Flammability Rating:
UL94 V-0
Product Dimensions:
No Gauge: (L) 3.25” (W) 2.18” (H) 1.87” (82.55 x 55.37 x 47.49 mm)
With Gauge: (L) 3.25” (W) 2.18” (H) 2.95” (82.55 x 55.37 x 74.9 mm)
Product Weight:
PXP1.3: 0.40 lbs. (0.1814 Kg) | PXP2.3: 0.47 lbs. (0.2126 Kg) | PXP1.3G: 0.49 lbs. (0.2211 Kg)
PXP2.3G & PXP2.3GFS: 0.59 lbs. (0.2693 Kg)
Agency Approvals:
RoHS2, WEEE

 

PXP Analog to Pneumatic Output

STANDARD 
ORDERING
 
Model #
Item #
Supply
Exhaust
Gauge
Additional Information
PXP0.3
127205
No Air Consumption
-
No Bleed Ori ce, Requires Downstream Bleed
PXP0.3G
127206
No Air Consumption
- +
No Bleed Ori ce, Requires Downstream Bleed
PXP1.3
127207
750 SCIM (12.29 Liters)
73 SCIM (1.196 Liters)
0.010” Bleed Orifice
PXP1.3G
127208
750 SCIM (12.29 Liters)
73 SCIM (1.196 Liters)
+
0.010” Bleed Orifice
PXP2.3
127209
750 SCIM (12.29 Liters)
750 SCIM (12.29 Liters)
Maintains Branch Pressure
PXP2.3G
127213
750 SCIM (12.29 Liters)
750 SCIM (12.29 Liters)
+
Maintains Branch Pressure
PXP5.3
127215
750 SCIM (12.29 Liters)
14 SCIM (0.229 Liters)
0.005” Bleed Orifice
PXP5.3G
127216
750 SCIM (12.29 Liters)
14 SCIM (0.229 Liters)
+
0.005” Bleed Orifice
PXP7.3
127217
750 SCIM (12.29 Liters)
41 SCIM (0.671 Liters)
0.007” Bleed Orifice
PXP7.3G
133044
750 SCIM (12.29 Liters)
41 SCIM (0.671 Liters)
+
0.007” Bleed Orifice
PXP2.3FS
127210
750 SCIM (12.29 Liters)
750 SCIM (12.29 Liters)
Exhausts on Power Failure
PXP2.3GFS
127211
750 SCIM (12.29 Liters)
750 SCIM (12.29 Liters)
+
Exhausts on Power Failure
PXP2.3LG
127214
1400 SCIM (22.94 Liters)
1400 SCIM (22.94 Liters)
+
Maintains Branch Pressure, High Flow

  

ACCESSORIES
 
Model #
Item #
Description
A/DO008
142583
Transient Voltage Suppressor, Bi-directional, 56 VAC/DC, 1500W
A/DRC 2.7 X 2.18
142626
DIN Rail Adapter Kit
A/PN002
136499
10-32 X 1/8" ID, Barb Fitting
A/PN004
110831
80-100 Micron Filter Media in Barb Fitting
A/PN021
112219
In Line 10 Micron Filter, Installs in-between air supply and main barb connection
A/PN023
129675
0.005" Replacement Copper Orifice
A/PN024
128100
0.007" Replacement Brass Orifice
A/PN025
128102
0.010" Replacement Brass Orifice
A/PN028
128307
Replacement Gauge
ENC1
102472
20 Gauge Metal Enclosure, Designed to Hold Interfaces Products

 

EPC Analog to Pneumatic Output

EPC Analog to Pneumatic Output

The EPC Series are electric to pneumatic transducers which convert an analog input signal to a proportional pneumatic output, modulating its control valve(s) to regulate the branch line pressure to the set point determined by the input signal. The EPC series oers four selectable input ranges. Output pressure ranges are jumper shunt selectable and adjustable in all ranges. A feedback signal indicating the resultant branch line pressure is also provided. EPC Series is designed with electrical terminals on one end and pneumatic connections on the other, allowing for maximum convenience in wiring and tubing installation when panel mounted. The EPC is a constant bleed interface with branch exhaust response time determined by the bleed orice size and pressure dierentials. If power fails to the EPC, it will continue to bleed through the bleed orice until branch pressure is zero psig. The EPC2 incorporates two valves (one controls exhaust), does not bleed air at set point, and has a 750 scim supply and exhaust. Its branch exhaust ow and response time are not limited by an internal restrictor and are similar to its load rate. EPC2LG operates as the EPC2, but has a higher air ow rate (1400 scim) using an external 5 micron lter, and includes a 0-30 psi gauge. If power fails to the EPC2 or EPC2LG, branch line pressure remains constant if the branch line does not leak air. The EPC2FS shares the same specications as the EPC2 except its 3-way branch valve will exhaust branch line air upon power failure. Custom calibration is available upon request for an additional charge. This will speed up installation time for the end user.

 

Applications: 3 Way Mixing Valve Control, Chiller Loading, Pilot Positioner Control, Pneumatic Valve & Damper Actuator Control, Fan Vane Control, DDC Control, Above Ceiling Applications (Mixing & VAV Boxes)

 

The EPC is covered by ACI's Two (2) Year Limited Warranty. The warranty can be found in the front of ACI's Sensors & Transmitters catalog, as well as on ACI's website, www.workaci.com.

PRODUCT SPECIFICATIONS
Supply Voltage:
24 VAC (+/-10%), 50 or 60Hz, 24 VDC (+10%/- 5%)
Supply Current:
180 mA maximum, 200 mA on fail safe models
Input Signal Source (@ Impedance):
0-5 VDC @ innite Ω | 0-10 VDC @ innite Ω | 0-15 VDC @ innite Ω | 0-20 mA / 250Ω
Feedback Signal Output Range:
0-5 VDC = Output Span
Output Pressure Range:
Field Calibration Possible: 0 to 20 psig (0-138 kPa) maximum
Output Pressure Range-Jumper Selectable:
0-10 psig (0-68.95 kPa), 0-15 psig (0-103.43 kPa) or 0-20 psig (137.9 kPa)
Air Supply Pressure:
Maximum: 28 psig (193.06 kPa), minimum 22 psig (151.69 kPa)
Air Consumption:
See Ordering Grid
Output Pressure Accuracy:
1% room temperature | 2% full scale across operating temperature range
Manual / Auto Override:
MAN function = output can be varied | AUTO function = output is controlled from input signal
Manual / Auto Override Switch:
Dry Contacts: 24 VDC/VAC @ 1A maximum, N.O. in AUTO operation (Optional: N.O. in MAN operation)
Air Flow:
Supply valves @ 25 psig (172.38 kPa) main/20 psig (137.9 kPa) out, 750 scim (1400, LG model) Branch Line requires 2 in3 / 33.78 cm3 (min.) | Min. 25 ft of 1/4” O.D. poly branch tubing
Filtering:
Furnished with integral-in-barb 80-100 micron lter (Part # PN004) except for PXP2LG which is
furnished with external 5 micron in-line lter (PN021)
Connections:
90° Pluggable Screw Terminal Blocks 
Wire Size:
16 (1.31 mm ) to 26 AWG (0.129 mm )
Terminal Block Torque Rating:
0.5 Nm (Minimum); 0.6 Nm (Maximum)
Connections | Pneumatic Tubing Size-Type:
1/4" O.D. nominal (1/8” I.D.) polyethylene
Pneumatic Fitting:
Removeable brass barbed fittings for Main and Branch in machined aluminum manifold
Plugged 1/8-27-FNPT gauge port 
Gauge Pressure Range (Gauge Models):
0-30 psig (0-200 kPa)
Gauge Pressure Accuracy (Gauge Models):
± 2.5% Midscale (± 3.5% Full Scale)
Operating Temperature Range:
35 to 120°F (1.7 to 48.9°C)
Operating Humidity Rage:
10 to 95% non-condensing
Storage Temperature:
-20 to 150°F (-28.9 to 65.5°C)
Snaptrack Material:
Polyvinyl Chloride (PVC)
Snaptrack Flammability Rating:
UL94 V-0
Enclosure Option (Box Option):
Painted steel housing has mounting ange with four holes for sheet metal screws
Product Dimensions:
See table on back of product data sheet
Product Weight:
EPCG: 0.46 lbs. (0.2069 Kg) | EPC2G: 0.70 lbs. (0.3175 Kg) | EPC2GFS: 0.68 lbs. (0.309 Kg) EPC2GB: 1 lbs 1 oz. (0.482 Kg) | EPC2GFSB: 0.96 lbs. (0.436 Kg)
Agency Approvals:
RoHS2, WEEE

 

EPC Analog to Pneumatic Output

STANDARD 
ORDERING
 
Model #
Item #
Supply
Exhaust
Gauge
Additional Information
EPC
102475
750 SCIM (12.29 Liters)
41 SCIM (0.6719 Liters)
0.007” Bleed Orifice
EPCG
102480
750 SCIM (12.29 Liters)
41 SCIM (0.6719 Liters)
+
0.007” Bleed Orifice
EPC2
102476
750 SCIM (12.29 Liters)
750 SCIM (12.29 Liters)
Maintains Branch Pressure
EPC2G
102478
750 SCIM (12.29 Liters)
750 SCIM (12.29 Liters)
+
Maintains Branch Pressure
EPC2FS
102477
750 SCIM (12.29 Liters)
750 SCIM (12.29 Liters)
Exhausts on Power Failure
EPC2GFS
102479
750 SCIM (12.29 Liters)
750 SCIM (12.29 Liters)
+
Exhausts on Power Failure
EPC2LG
106325
1400 SCIM (22.94 Liters)
1400 SCIM (22.94 Liters)
+
Maintains Branch Pressure, High Flow
EPC2GB
106326
750 SCIM (12.29 Liters)
750 SCIM (12.29 Liters)
+
Enclosed in Steel Housing, Maintains Branch Pressure
EPC2GFSB
106327
750 SCIM (12.29 Liters)
750 SCIM (12.29 Liters)
+
Enclosed in Steel Housing, Exhausts on Power Failure

 

ACCESSORIES
 
Model #
Item #
Description
A/DO008
142583
Transient Voltage Suppressor, Bi-directional, 56 VAC/DC, 1500W
A/DRC 2.7 X 3.25
142624
DIN Rail Adapter Kit
A/PN002
136499
10-32 X 1/8" ID, Barb Fitting
A/PN004
110831
80-100 Micron Filter Media in Barb Fitting
A/PN021
112219
In Line 10 Micron Filter, Installs in-between air supply and main barb connection
A/PN028
128307
Replacement Gauge

 

Interface Device Selection Matrix

Select your controller’s signal output in the column on the left (Your Signal). Then, select the output required by the actuator or other device, in the row across the top of the matrix (Signal Required). Some scenarios require two devices to reach the desired output and include a “+” between them. Refer to the detailed product speci cations in the Interface Device section of the ACI Binder Catalog or visit www.workaci.com.

Interface Device Selection Matrix

ACI's EPC and PXP Signal Conversion Interface Devices
ACI's Interface Devices convert one signal type to another. While many of the devices share similar functions, knowing their differences will help you know the best device for your application.

Read more →


Posted by Adem Erturk on

How to Test a Home Thermostat

How to Test a Home Thermostat

Thermostats are devices that control both the heating and cooling system and hold a lot of importance in millions of homes because they provide relief from the coldness or hotness of extreme weather conditions and comfort during the hot and cold seasons. They detect the temperature of the room to check if it is within the desired temperature setting. If it’s too warm or too cold, you can use your thermostat to turn on the heat or the AC to adjust it to the preferred temperature – or your thermostat can do it for you.

When you think about it, a thermostat is really just a switch that turns your heating and cooling systems on and off. The thermostat constantly runs in the background, continuously providing comfort to the members of the household. Most of the time, it is overlooked or sometimes even forgotten as it quietly does its job – until it stops working properly.

Types of Thermostats

There are a lot of different types of thermostats available in the market but generally, all of them can be classified into two categories: electromechanical and electronic.

Electromechanical thermostats are the old-fashioned mechanical thermostats that have two strips of metal that form a single bimetal strip.  On the other hand, electronic thermostats are the modern models which have more sophisticated temperature controls and timers. Since they are more sophisticated, their inside workings are a bit more complicated which means replacements and repairs are also pricier. However, with electronic thermostats (also referred to as programmable thermostats) you can program the temperature of your home ahead of time even while you are away, something you can't do with their electromechanical counterparts. Programming in advance will also decrease your energy bill making electronic or programmable thermostats the more price efficient option.

Check the cost of electronic thermostats.

How to See If the Thermostat Works

Before you declare your thermostat as having malfunctioned, you have to check first if it has really failed. Here are some things you can do prior to testing your home thermostat.

  1. Check the batteries - Oftentimes, the problem just lies in drained batteries. Try to replace your thermostat's old batteries first to ensure that your device has enough power.
  2. Clean the device’s interior - Remove the face of the thermostat and check if its interior has become dusty. Dirt can actually impede the device's functionality so it's important to dust it off with a small brush regularly.
  3. Note where the device is located - The location of your thermostat has a lot of impact on its performance. It shouldn't be placed in direct sunlight because it will give out higher temperature readings. It also shouldn't be placed near doors and windows because these areas are generally cooler; if your thermostat is placed in these areas, the device will register temperature readings that are cooler than how the room actually feels. Ideally, your thermostat should be placed on the interior wall near the center of your home.

If you have done the following and your device is still not working, then that must mean that there is an issue with its wiring inside. Here's how to test a thermostat in seven easy steps:

Step #1:

First of all, make sure to turn off your furnace before removing the thermostat's cover. This is to ensure that you will be safe from potential burns while working with the device.

Step #2:

Carefully remove the thermostat cover and after doing so, examine the wires. You will find a number of wires inside but don't be overwhelmed. You will only need to find the red and white wires. These are the ones that are standard colors for power and heat.

Step #3:

Unscrew and remove the wires from their terminals. Make sure to not let them fall into the hole in the wall.

Step #4:

Twist the bare ends of the red and white wires together.

Step #5:

Turn the furnace back on. If the blower is working but the furnace burner ignites, the device was connected improperly to the wires. This can also mean that the thermostat is defective and that you will need to have it replaced as soon as possible.

Step #6:

If the burner does not turn on, this means that the wires are not properly connected from the thermostat to the furnace.

Step #7:

Tighten the terminal screws at all wire connections before putting the cover back on.

But what if the thermostat, STILL doesn’t work after this?

Don’t mess with your thermostat too much because you might risk inflicting further damage to your device. Instead, contact an expert technician to look into the matter.

Energy Saving Tips

Energy Saving Tips

No one wants to receive a large energy bill but luckily, there are a lot of ways that you can lower your energy consumption especially during this winter season.

Did you know that almost 50% of home energy consumption in the U.S. comes from heating and cooling systems? If you want to save energy to lower your bills, start with your thermostat. Even slight adjustments can have a huge impact on your home's energy usage.

Here are some maintenance tips to optimize your thermostat's performance and efficiency.

  • Dial back - You can save up to 10% per year on your energy bills if you adjust your thermostat by dialing your heat or air conditioning back to 10 to 15 degrees when your home is unoccupied or when you and your family are all asleep. These few degrees are not enough to make a noticeable difference when it comes to comfort but go a long way in helping you lower your bills.
  • Choose to go modern - Programmable thermostats help saving energy because you won't have to adjust it daily. With a programmable thermostat, you can set it for seven days and then forget about. See the best programmable thermostats.
  • Regular tune-up - Your thermostat needs regular maintenance to keep them working properly and efficiently. As stated above, you should keep your thermostat dust-free by brushing it off regularly. However, it is also recommended to call a qualified technician for a yearly tune-up.



How to Test a Home Thermostat

Thermostats are devices that control both the heating and cooling system and hold a lot of importance in millions of homes because they provide relief from the coldness or hotness of extreme weather conditions and comfort during the hot and cold seasons. They detect the temperature of the room to check if it is within the desired temperature setting. If it’s too warm or too cold, you can use your thermostat to turn on the heat or the AC to adjust it to the preferred temperature – or your thermostat can do it for you. When you think about it,...

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