Acutherm Acu-Zone I Manuel utilisateur

Form # 70.0 IOM-001 REV 0603

Acu-Zone

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

Form # 70.0 IOM-001 REV 0603

Acu-Zone™ Heater Models

Zone™ I Heating Uni

(Round)

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. The

-Zone™ I units should be used on individual diffusers and

on multiple diffusers up to a total of four. Discharge temperature

control is built-in to this unit.

Zone™ II Heating Uni

(Round)

The Acu-Zone™ II is designed for larger zones that require

primary or supplementary heating. These units are to be used

with the diffuser models indicated above. Discharge temperature

control is accomplished by a remotely mounted discharge

thermostat downstream from the heater.

The Round sizes that are available for this model are 14”Ø and

16”Ø.

Zon

™ II Heating Uni

The Acu-Zone™ II is designed for larger zones that

require primary or supplementary heating. These units are

to be used with the diffuser models indicated above.

Discharge temperature control is accomplished by a

remotely mounted discharge thermostat downstream from

the heater. Units are configured for “slip-in” installation with

flanges OPTIONAL (Consult Factory).

The Acu-Zone™ II heating units can be made in virtually

any rectangular or square size and in any KW and voltage

available.

Form # 70.0 IOM-001 REV 0603

Application Drawing:

SCR Controlled Electric Heater

Acu-Zone™ I

Zon

Trunk Duct

Manual Damper

Acutherm Therma-Fuser 

Diffuser

VAV Cooling and Heating or VAV

Cooling with Constant Volume

Heating

Acu-Zone

Electric Heater for

Supplementary or Primary Heat

Unit will have wall mounting sensor and SCR heater

control. Internal airflow/temperature sensors (

Acu-

Sensors™)

will modulate the heater capacity (KW) to

match the available airflow and limit the discharge

temperature to 90°F.

8” Min.8” Min.

Acu-ZoneI

Wall

Thermostat

Application:Single or

Multiple Diffusers (up to 4)

Single Units: Application

shown to the right with a

single

Acu-Zone

space

temperature sensor.

Multiple Units: Application

similar to that shown;

however, the discharge of the

heater will be split among

four up to four diffusers.

(More than four diffusers, use

the

Acu-Zone II

system).

Note: Maximum Flexible Duct

to each diffuser should not

exceed 7’-0”

Form # 70.0 IOM-001 REV 0603

D 12-24”

D12-24”

Application Drawing:

SCR Controlled Electric Heater

-Zone™ II

R-PIM

–

Round Pressure

Independence Module

Acu-Zone

II Electric Heater

with SCR Control

Main

Duct

Acutherm Therma-Fuser

Diffusers with VAV cooling and Heating

or VAV Cooling with Constant Volume

Heating

Acutherm Square or Rectangular

Pressure Independence Module

Main

Duct

Acu-Zone

II Electric

Heater with SCR Control

“D” = 1 Duct Diameter

Exam

le: 6”Ø Duct

–

“D” = 6”

Acutherm Therma-Fuser

Diffusers with VAV cooling and

Heating or VAV Cooling with

Constant Volume Heating

“D” = = Duct Width

Exam

le: 24” Width Duct

–

“D” = 24”

Form # 70.0 IOM-001 REV 0603

Selection of the Acu-Zone™ Heater using

the following three steps:

1. Determine the heater capacity, voltage, and electrical

components desired

2. Determine the duct dimensions, air requirements, and

mechanical options

3. Determine the method of control and then select the

control components

Step 1: Determine the heater capacity, voltage, and

electrical components . . .

Heater Selection

Useful Formulas

BTU Formulas:

(#) BTU’s x 0.29307 = Watts

1 KW = 3413 BTU’s

Using the chart on the following page you can select the correct KW capacity if you know

the CFM and the temperature rise desired. Follow the instructions on the page to easily

select the properly sized heater.

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

Acu-Zone

I & II

Electric Zone Heater

Application, Selection, &

Specification Manual

Heating Calculation:

BTU = CFM x 1.08(∆T

KW = (CFM x ∆T)

3150

∆T = (KW x 3150)

CFM

Form # 70.0 IOM-001 REV 0603

Streamlined KW Selection

Graph

(Step 1)

Form # 70.0 IOM-001 REV 0603

Model AZON I

Size

CFM ∆T °F BTUH KW(Nominal)

6”Ø 100 35°F 3780 1.11

6”Ø 140 35°F 5292 1.58

6”Ø 175 35°F 6615 1.94

6”Ø 200 35°F 7560 2.22

6”Ø 225 35°F 8505 2.50

8”Ø 160 35°F 6048 1.77

8”Ø 225 35°F 8505 2.49

8”Ø 275 35°F 10,395 3.04

8”Ø 320 35°F 12,096 3.54

8”Ø 355 35°F 13,419 3.94

10”Ø 260 35°F 9828 2.88

10”Ø 370 35°F 13,986 4.10

10”Ø 450 35°F 17,010 4.98

10”Ø 520 35°F 19,656 5.76

10”Ø 580 35°F 21,924 6.43

12”Ø 350 35°F 13,230 3.87

12”Ø 470 35°F 17,766 5.20

12”Ø 560 35°F 21,168 6.20

12”Ø 640 35°F 24,192 7.08

12”Ø 720 35°F 27,216 7.97

Select the appropriate Acu-Zone™ I Heating Unit based on the CFM and KW noted that

corresponds to the capacity that you need. Please note that the capacities shown are for

reference only and are based on the 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.

Acu-Zone

I & II

Electric Zone Heater

Application, Selection, &

ecification Manual

Acu-Zone™ I - Heating Performance Data:

Selection by Diffuser Capacity (Model TF-HC)

Form # 70.0 IOM-001 REV 0603

Using the following capacity table, select the appropriate model number based on the KW

capacity, voltage, and diameter. Please note that the models shown reflect multiple voltages in

the model number. Pick only one voltage only (i.e. 120/1/60).

Model Collar

Size

KW *Voltage Nominal

CFM Range

**Minimum

CFM

AZONI-6-1120/208/240/277 6”Ø 1 120/208/240/277/1/60 100 60

AZONI-6-1.5120/208/240/277 6”Ø 1.5 120/208/240/1/60 101-140 60

AZONI-6-2120/208/240/277 6”Ø 2 120/208/240/277/1/60 155-199 120

AZONI-6-3208/240/277 6”Ø 3 208/240/277/1/60 200-225 180

AZONI-8-2120/208/240/277 8”Ø 2 120/208/240/277/1/60 160 120

AZONI-8-3208/240/277 8”Ø 3 208/240/277/1/60 225-275 180

AZONI-8-4208/240/277 8”Ø 4 208/240/277/1/60 276-355 240

AZONI-10-3208/240/277 10”Ø 3 208/240/277/1/60 260 180

AZONI-10-4208/240/277 10”Ø 4 208/240/277/1/60 261-370 240

AZONI-10-5208/240/277 10”Ø 5 208/240/277/1/60 371-450 300

AZONI-10-6208/240/277 10”Ø 6 208/240/277/1/60 451-520 360

AZONI-10-7208/240/277 10”Ø 7 208/240/277/1/60 521-580 420

AZONI-12-4208/240/277 12”Ø 4 208/240/277/1/60 350 240

AZONI-12-5208/240/277 12”Ø 5 208/240/277/1/60 351-470 300

AZONI-12-6208/240/277 12”Ø 6 208/240/277/1/60 471-560 360

AZONI-12-7208/240/277 12”Ø 7 208/240/277/1/60 561-640 420

AZONI-12-8208/240/244 12”Ø 8 208/240/277/1/60 641-720 480

* 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.

Zone™ I Standard Model

–

Capacities & Voltages

Acu-Zone

I & II

Electric Zone Heater

Application, Selection, &

ecification Manual

Form # 70.0 IOM-001 REV 0603

R-PIM Size CFM ∆T °F BTUH KW

6”Ø 510 45°F 24,786 7.27

425 45°F 20,655 6.05

350 45°F 17,010 4.98

275 45°F 13,365 3.92

150 45°F 7290 2.14

83 45°F 4034 1.19

8”Ø 905 45°F 43,983 12.89

750 45°F 36,450 10.68

625 45°F 30,375 8.90

790 45°F 23,814 6.98

300 45°F 14,580 4.28

136 45°F 6610 1.94

10”Ø 1415 45°F 68,769 20.10

1200 45°F 58,320 17.08

1000 45°F 48,600 14.23

765 45°F 37,179 10.89

500 45°F 24,300 7.12

215 45°F 10,449 3.062

12”Ø 2040 45°F 99,144 29.04

1700 45°F 82,620 24.20

1400 45°F 68,040 19.92

1100 45°F 53,460 15.66

700 45°F 34,020 9.96

295 45°F 14,337 4.20

14”Ø 2780 45°F 135,108 39.57

2400 45°F 116,640 34.16

2000 45°F 97,200 28.47

1600 45°F 77,760 22.78

1000 45°F 48,600 14.23

413 45°F 20,072 5.88

16”Ø 3615 45°F 175,689 51.47

3050 45°F 148,230 43.42

2500 45°F 121,500 35.59

1950 45°F 94,770 27.76

1200 45°F 58,320 17.09

541 45°F 26,293 7.70

Indicates Nominal Performance Data – Unit will operate throughout the entire range shown. Consult

the Sound Data before using selections above the Nominal Values.

** 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.

Acu-Zone

I & II

Electric Zone Heater

Application, Selection, &

ecification Manual

Performance Data

–

Usin

with the R-PIM (Acu-Zone™ II)

Acu-Zone™ I **

Acu-Zone II

Form # 70.0 IOM-001 REV 0603

Power and Voltage Requirements: (Step 1)

Electric utilities refer to the voltage they supply with a nominal figure. The actual voltage

that the electric heater sees may vary over a very wide range. For example, a nominal

voltage of 575V / 3PH / 60 HZ may be called 550, 575, or 600V depending upon the

normally accepted convention at your location.

Designing a heater for 550V when 600V is supplied will result in a current draw increase

of over 10%, and there will be a 20% jump in the KW capacity. This is because the

current is proportional to the voltage, and the KW is proportional to the square of the

voltage. The application of a lower voltage will result in the underperformance of the

heater because of “de-rating” caused by the lower voltage.

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.

This voltage standardization reduces the risk of overheating due to the heater being

supplied with over-voltage. This overcapacity could result in the nuisance tripping of the

high temperature cut-outs.

Acu-Zone

I & II

Electric Zone Heater

Application, Selection, &

Specification Manual

Common

Nominal

Voltages

110

115

120

208 220 230

240

277 318

332

347

380 416 440

460

480

550

575

600

Acutherm

Standard

Voltages

120

208

220

240

277

347

380

416

480

600

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