Carrier 38APS025 Manual
Also see for 38APD115: Installation instructions
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Contents
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1334-20 mA Temperature Reset — The energy managementmodule (EMM) must be used for temperature reset using a 4 to20 mA signal. The signal can be monitored to the control atthe scrolling marquee point 4-20 mA Reset Signal (Inputso4-20oRSET).To use 4-20 mA temperature reset, two variables must beconfigured. In ConfigurationoRSET, set these items:• Cooling Reset Type (CRST): Configure for the type ofreset desired, 4-20 mA Input• MA.DG: Set to the amount of reset desired with a 20 mAsignal. The control will interpolate between 0 degrees resetat 4 mA and the value entered for MA.DG at 20 mA.The 4-20 mA input temperature reset example shown in Ta-ble 61 and Fig. 153 and 154 provides 0° F (0° C) reset to theActive Set Point (Run StatusoVIEWoSETP) if RSET =4mA and 6° F (3.3° C) reset if RSET=20 mA. Using these val-ues, if SETP=55 F (12.8 C) and RSET =4 mA, the ControlPoint (Run StatusoVIEWoCTPT) will reflect 0° F (0.0° C)reset or 55 F (12.8 C). If RSET=20 mA, the Control Point(Run StatusoVIEWoCTPT) will reflect 6° F (3.3° C) resetor 61 F (16.1 C). Between RSET =4 mA and RSET=20 mA aproportional reset amount will be applied to CTPT.Table 61 — Configuring 4 to 20 mA Temperature Reset*Not supported.CAUTIONTo avoid unit damage, care should be taken when interfac-ing with other manufacturer’s control systems due topower supply differences, full wave bridge versus halfwave rectification. The two different power supplies cannotbe mixed. ComfortLink controls use half wave rectifica-tion. A signal isolation device should be utilized if a fullwave bridge signal generating device is used.CONFIGURATIONoOPT2ITEM EXPANSION COMMENTS EXAMPLE VALUEC.TYP Machine Control TypeRange: 1 to 91 (VAV)3 (Tstat Multi)4 (Tstat 2stg)5 (SPT Multi)7 (PCT Cap)8 (Dual Tstat)9 (VAV Setpoint)Default: 4Value must be set to 1, 3, 5 or 91, 3, 5 or 9MODEoSUB-MODE: CONFIGURATIONoRSETCRST Cooling Reset Type0=No Reset (Default)1=4-20 Input2=Out Air Temp3=Return*4=Space Temp1MA.DG 4-20 – Degrees ResetRange: –30.0 to 30.0 'F(–16.7 to 16.7 'C)Default: 0.0 'F (0.0 'C)6.0 'F(3.3 'C) |
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