Advertisement
Quick Links
Application, Selection
and Specification
Acu-Zone™ II
Heating Unit
Square and
Rectangular
Copyright Acutherm 2006
Form # 70.0 IOM-001 REV 0603
Acu-Zone
Electric Zone Heaters
Manual
6"Ø, 8"Ø, 10"Ø, 12"Ø
1
I & II
Acu-Zone™ I
Heating Unit
Round Sizes:
Acu-Zone™ II
Heating Unit
Round Sizes:
14"Ø & 16"Ø
Advertisement
Summary of Contents for acutherm Acu-Zone I
- Page 1 I & II Electric Zone Heaters Application, Selection and Specification Manual Acu-Zone™ I Heating Unit Round Sizes: 6”Ø, 8”Ø, 10”Ø, 12”Ø Acu-Zone™ II Heating Unit Round Sizes: 14”Ø & 16”Ø Acu-Zone™ II Heating Unit Square and Rectangular Copyright Acutherm 2006...
- Page 2 The Acu-Zone™ I is a specially designed unit that is available in smaller-sizes like 6”Ø, 8”Ø, 10”Ø, and 12”Ø that will match the Acutherm Therma-Fuser diffuser neck sizes. The units should be applied to Therma-Fuser diffusers that are VAV cooling and heating and VAV cooling with constant volume heating (warm-up) - model numbers that have the HC or CW suffix respectively.
-
Page 3: Application Drawing
Cooling with Constant Volume four up to four diffusers. Acu-Zone I Wall Heating (More than four diffusers, use Thermostat Acu-Zone II system). Note : Maximum Flexible Duct to each diffuser should not exceed 7’-0” Copyright Acutherm 2006... - Page 4 Acu-Zone II Electric Heater with SCR Control Main Duct 12-24” Acutherm Square or Rectangular Pressure Independence Module Acutherm Therma-Fuser “D” = = Duct Width Diffusers with VAV cooling and Example: 24” Width Duct – “D” = 24” Heating or VAV Cooling with Constant Volume Heating Copyright ...
- Page 5 Follow the instructions on the remaining pages to make sure that the KW you select is supported by the voltage and phase that you have available. Large KW units (over 20) are seldom available in single phase. Continued Copyright Acutherm 2006...
- Page 6 Form # 70.0 IOM-001 REV 0603 Streamlined KW Selection Graph (Step 1) Copyright Acutherm 2006...
- Page 7 Acu-Zone™ I use with the TF-HC. Performance data is the same for the model TF-CW (constant heating). For other models, use the desired diffuser’s flow rate in the chart and apply the formula(s) shown on the previous pages. Copyright Acutherm 2006...
- Page 8 641-720 * See Page 34 for complete voltages available. Units will accept 50HZ or 60HZ power. ** Minimum CFM through the heater to have the full capacity shown. Unit automatically adjusts capacity as the airflow decreases. Copyright Acutherm 2006...
- Page 9 ** Indicates Special Order Units – Allow extra fabrication time (Standard capacities for Acu-Zone™ I units with 6”Ø, 8”Ø, 10”Ø, and 12”Ø - see table page 8). This unit uses the Acu-Zone™ II wall sensor with the internal Acu-Sensor™ for discharge temperature control. Copyright Acutherm 2006...
- Page 10 Therefore, it is imperative that the correct voltage is chosen and specified. To insure the utmost safety, Acutherm has chosen the highest voltages for each range and the voltages are shown in the table below. Heaters designed for lower voltages in each range are available and will be supplied when the customer specifically requests the lower voltage.
- Page 11 Single Phase Power Supply – 347 & 277V (Step 1) When capacities are below 7 KW at 277 V and 8KW at 347 V, Acutherm recommends the use of the following arrangements to obtain the most economical cost for heaters and electrical distribution Copyright ...
- Page 12 Form # 70.0 IOM-001 REV 0603 Acu-Zone I & II Electric Zone Heater Application, Selection, & Specification Manual Selection Chart for the most economical design for Acu-Zone™ Heaters – KW / Voltage Combination (Step 1) Copyright Acutherm 2006...
- Page 13 A single stage, three phase heater rated at 40 amps will use one set (3 fuses of 60 amps). Stage Fuses: Mostly optional, one or more sets of fuses per stage. (Option U-2). Acutherm’s standard fuses are 30 amps for circuits up to 24 amps, and 60 amps for circuits up to 48 amps.
- Page 14 It is standard on heaters of 30 KW and less and those not in excess of 300 volts. It is optional on all other heaters. This switch must be manually reset to return the heater to its operating condition. Copyright Acutherm 2006...
- Page 15 Magnetic contactors are used for stage switching as back-up for safety devices. Approved for 250,000 cycles, magnetic contactors are cost effective and safe. Partial break contactors are standard on the Acu-Zone I & II units. Transformer: A built-in control transformer is required on most heaters (standard on Acu-Zone™...
- Page 16 12 to 20 Low cost per KW proportional Over 20 Medium cost per KW control 400-2000 Most economical range Table 1- KW per Square Foot Over 2000 Specify special coil supports Table 2 – Design Velocity Table Copyright Acutherm 2006...
- Page 17 6”Ø through 12”Ø – 6” x 6” through 24” x 18” Up to 8KW @ 347/1/60 6”Ø through 12”Ø – 6” x 6” through 24” x 18” Other dimensions, capacities and voltages up to 40 KW and 600V/3PH are available upon request Copyright Acutherm 2006...
- Page 18 Heaters installed near (within 4 feet) a fan outlet, elbows, baffle plates or other obstruction in duct work may require turning vanes, [ressure plates or other devices in the inlet side of the duct heater to assure an even distribution of air over the face of the heater.” Copyright Acutherm 2006...
- Page 19 Determine the duct dimensions, air requirements, continued and mechanical options . . . Size Limitations Although there are virtually no limitations to the maximum size of Acutherm custom built heaters, all CSA Listed heaters must comply with the following dimensions: Slip-in Type Flanged Type...
- Page 20 Care must be taken to install the heater such that clearance room is allowed for removal and servicing of the heater. The diagram below shows the recommended installation clearances/ OPTIONAL Flange Slip-in Type AZON II Type AZON II Copyright Acutherm 2006...
-
Page 21: Temperature Control Mode
90°F supply air because of sufficient airflow. If the airflow to the heater is lost, then the Acu-Sensor™ shuts the heater down. Copyright Acutherm 2006... - Page 22 The shaded areas correspond to wasted energy. A proportional control can maintain an accurate discharge temperature without the typical variations of the ON/OFF method. The energy savings of the proportional control is at least 15%. 90°F Discharge Temperature Copyright Acutherm 2006...
- Page 23 . . . Temperature Control Mode – Full SCR Control General Note: All controllers supplied are equipped with a zero-cross thyrister switching system that virtually eliminates electro-magnetic interference (EMI) and radio frequency interference (RFI). Copyright Acutherm 2006...
- Page 24 Step 3: Determine the method of control and select the control components . . . Temperature Control Mode – Wall Sensors and Duct Thermostats Acu-Zone I HEAT Standard Control Acu-Zone I - LED for On/Off # AZONT-25346 The Acu-Zone ...
- Page 25 Electronic SCR Controller – D21T Inputs: Thermistor thermostat – ADT-1040 Proportional Air Flow Sensor that allows: Full power with normal minimum air flow Reduced power with air flow below the minimum No heat with no airflow Outputs: One SCR Load Copyright Acutherm 2006...
- Page 26 . . . Specifications Acu-Zone™ I – Acu-Zone™ I - Guide Specifications: The model AZON I, Acutherm’s Acu-Zone I electric zone heater shall be as supplied by Acutherm, LP, Hayward, California. The Acu-Zone I electric zone heater shall be an open coil duct heater, packaged in a heavy ...
- Page 27 I electric zone heater shall have a Two Year Warranty and shall be CSA [C & US] labeled for safety and reliability. Acu-Zone™ II - Guide Specifications: The model AZON, Acutherm’s Acu-Zone II electric zone heater shall be as supplied by Acutherm, LP, Hayward, California. The Acu-Zone ...
- Page 28 The Acu-Zone II electric zone heater shall have a Two Year Warranty and shall be CSA (C & US) labeled for safety and reliability. Copyright Acutherm 2006...
- Page 29 (Standard on Acu-Zone Unit Size AZON I -06 6.5” 10” 6” 10” 14” AZON I -08 6.5” 10” 8” 14” 11” AZON I -10 6.5” 5” 10” 14” 14” AZON I -12 6.5” 5” 12” 16” 14” Copyright Acutherm 2006...
- Page 30 14” 11” AZON II -10* 6.5” 5” 10” 14” 14” AZON II-12* 6.5” 5” 12” 16” 14” AZON-14 6.5” 5” 14” 18” 14” * Indicates Special Order Units for use with R-PIM Round Static Pressure Dampers Copyright Acutherm 2006...
- Page 31 Built –In Air Flow Sensor • SCR. Control • Proportional Duct Thermostat – ADT 1040 (Standard) • UL Standard Protection • Interlock Terminal Strip • Disconnect Switch • Manual Cut- Unit Size AZON-16 6.5” 16” 16” 18” 16” Copyright Acutherm 2006...
- Page 32 Automatic Cut-out • Transformer – Fused • Built-in Air Flow Sensor • SCR Control • Proportional Duct Thermostat – ADT 1040 (Standard) • UL Standard Protection • Interlock Terminal Strip • Disconnect Switch • Manual Cut-out Copyright Acutherm 2006...
- Page 33 Magnetic Contactor – Partial Break • Automatic Cut-out • Transformer – Fused • Built-in Air Flow Sensor • SCR Control • Proportional Duct Thermostat – ADT 1040 (Standard) • UL Standard Protection • Interlock Terminal Strip • Disconnect Switch Copyright Acutherm 2006...
- Page 34 (8) Thermostat – “S” – Standard Wall Sensor (AZONT-25346) ; “WSDT” – Wall Sensor and Discharge Thermostat (AZONIITSDT-25347) ,“WSDTDWA” - Wall Sensor, Discharge Thermostat, & Digital Wall Adjuster (AZONT-25346-WA or AZONIITSDT-25347-WA or WANS) (9) Options: DS (Disconnect is Standard Equipment) (10) Accessories: Copyright Acutherm 2006...
-
Page 35: Two Year Warranty
Acutherm and found defective and provided the units have been given normal and proper usage and all parts and controls remain unaltered. Acutherm makes no WARRANTY...
Need help?
Do you have a question about the Acu-Zone I and is the answer not in the manual?
Questions and answers