When ordering, specify quantity, product number and description.

Transcription

1 Technical l InstructionI ons AQF61.1 Transducer for Absolute Des escription icroprocessor-based converter to calculate absolute humidity, enthalpy and enthalpy differential. App ppli lication For use in ventilating and air conditioning applications. Produ duct Numbers easures, regulates, controls and displays absolute humidity, enthalpy or enthalpy differential. Can be linked to building management systems. AQF61.1 Ord rdering Techn hnical Design When ordering, specify quantity, product number and description. Using a temperature detector and a relative humidity detector, the AQF61.1 transducer calculates absolute humidity (x) in gr/lb and enthalpy (h) in btu/lb The respective signals (0 10 Vdc) are continually present at two different outputs. When using an additional temperature detector and relative humidity detector, the AQF61.1 is able to calculate a second enthalpy value, which is made available as a separate output signal (0 10 Vdc). ln this case, the AQF61.1 determines the enthalpy differential, which is provided at another terminal in the form of a 0 10 Vdc signal. The temperature detectors used may be either passive (Pt1000 Ω or L-Ni1000 Ω) or active (0 10 Vdc) having a measuring range F ( 35 C - 35 C) and/or F (0-50 C. The humidity detectors required for the AQF61.1 are active detectors (0 10 Vdc) with a measuring range of 0-100% rh. A switch with four positions is provided to permit adaptation of the unit to the required elevation above sea level. This allows precise calculation of both absolute humidity and enthalpy.

2 Technical Instructions Des esign Featur ures The AQF61.1 is snapped onto standard mounting rails or screwed onto a flat surface. The plastic casing cannot be opened. It accommodates the electronic circuit in the form of a printed circuit board. The connecting terminals are located on the base and are easily accessible. Terminal covers are available as accessory items, if required. Printed on the front cover are: the terminal diagram the setting choices for the characteristics and the temperature ranges (L-Ni1000 Ω / Pt1000 Ω and F ( 35 C - 35 C)/ F (0 50 C) the adaptation to elevations above sea level The associated switches are located on the outer part of the printed circuit board at bottom left. Specifications Operating voltage 24 Vac ± 20% Frequency 50/60 Hz Power consumption 4.5 VA Input signals Temperature, passive L-Ni1000 Ω or Pt1000 Ω} Temperature, active 0 10 Vdc Relative humidity, active 0 10 Vdc Current Range Output signals Enthalpy <0.1 ma F ( C), F ( C), F (0-50 C / % rh the range btu/lb Enthalpy differential the range (btu/lb) Absolute humidity the range gr/lb Current max. ± ma Conversion error max.2.5% of absolute humidity or enthalpy range typically approx. 1%) Dead bme 1s Adaptation to elevation P1: 0-1,300 ft above sea level P2: 1,300 2,600 ft above sea level P3: 2,600 3,900 ft above sea level P4: >3,900 ft above sea level Permissible ambient temperature Operation F (0-50 C) Transport and storage F ( C) Permissible cable lengths Detector-computing unit See the respective data sheets Computing unit-controller by Cu-cable 18 AW. 82 ft using humidity detector QF64 Cu-cable 16 AW, 295 ft Cu-cable 14 AW, 426 ft Cu-cable 12 AW, 722 ft 2

3 AQF61.1 Transducer for Absolute Specifications, cont d. Screw type connecting terminals for Weight 2 x 14 AW or 1 x 12 AW 0.44 lb. Technical Instructions Eng nginee eering To generate the operating voltage of 24Vac, a transformer is required. When sizing the transformer, the power consumption of the AQF61.1 must be taken into consideration. The transducer, the active temperature and humidity detectors as well as the associated controllers must all be connected to the same 0 or (system neutral). This is important when using separate transformers. For the terminal designations and their meaning, see Internal diagram. Only one temperature detector may be connected to terminals and B2 or B4 and B5. The other terminals are not used. When using enthalpy differential control between the recirculated air and the outside air (maximum economy changeover) the recirculated air detectors must be connected to terminals or B2 and B3, the outside detectors to terminals B4 or B5 and B6. The duct humidity detector type QF64 is suitable for temperatures as low as -31 F ( 35 C). The transducer is protected against false wiring. Install llation oun ounting loca cation on: Usually in a control panel together with the associated controllers. When installing the AQF61.1 on site (e.g. near the detectors), it is recommended to use the terminal covers (risk of contamination). The permissible ambient temperature and humidity must always be observed (see Specifications). Comm mmissioning ng oun ounting mode: On standard mounting rails (AQF61.1 snaps on), or on a flat surface (with screws). oun ounting orien o entation on: Optional, if it is not possible to use the standard horizontal fixtures. Installation instructions are included in the packaging. ng When commissioning the equipment, the wiring and function of the unit must be checked. The electronic circuitry is not accessible. The only settings to be made are those described under Specifications and Design Features. The other settings required are made at the controllers to which the transducer is linked. 3

4 Technical Instructions Wiring F(passive) LNi1K /Pt1K F(active) F(active) 0-100%rH(active) F(passive) LNi1KW/Pt1KW F(active) 0 (T1a) B2 (T1b) B3 (rh1) (h1) (x1) U1 U BTU/LB R/LB 0-100%rH(active) B4 (T2a) B5 (T2b) B6 (rh2) 2 DIP Switch on off 1 on off 3 4 h1 = h(rh1, T1) x1 = x(rh1, T1) h2 = h(rh2, T2) (h2) (h1-h2) U3 U4 SPEC0043R BTU/LB BTU/LB Figure 1. Internal Diagram. 1 on: L-Ni1000 Ω 1 off: Pt1000 Ω 2 on: T1b = F ( C) 2 off: T1b = F (0-50 C) 3 off and 4 off: 0 1,300 ft above sea level 3 off and 4 on: 1,300 2,600 ft above sea level 3 on and 4 off: 2,600 3,900 ft above sea level 3 on and 4 on: >3,900 ft above sea level The switch positions shown are the factory-set positions. Connection diagrams Return air Outside air SP B B rh at50 B B rh at35 B2 B3 B2 B6 B5 0 B3 U1 B5 B4 U3 B6 U1 0 Y3 N1 Y R U SPEC0044R1 SN 0 Figure 2. Conn nnection Diagram for h Control. 4

5 AQF61.1 Transducer for Absolute Technical Instructions Connection diagrams, cont d. SP B B B rh at35 at50 0 B3 B2 (rh) (T) 0 U2 U1 N1 SPEC0045R1 SN Y R Figure 3. Conn nnecting Diagram for x Control., B2 Combined humidity and temperature detector QF64 U1 Transducer AQF61.1 for h, h and x N1 Universal controller RWF61... Actuator Dimensions U SPEC0046R EN x 0.30 Figure 4. Dimensions in Inches. Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as design improvements are introduced Siemen ens Buil ilding Techn hnolog ogies, Inc. Landis & Staefa Division 1000 Deerfield Parkway Buffalo rove, IL U.S.A. Printed in the U.S.A. 5