Carrier PERFORMANCE 50VT-A Installation Instructions Manual

Also see for COMFORT 50VT-A: Owner's information manual Owner's information manual Installation instructions

Contents

Carrier PERFORMANCE 50VT-A Installation Instructions Manual Manual pdf 20 page image

20HIGH LOW COMQC5 QC4 QC3KZ KL07 09 080L0 ALO R13 C8 R11 Q1Q3D2AL2DCR QCRQC1CRL 01G1G2Z1A7 R9 AB A15C4C9C0QIL Z2 06 04U1C3 R4 RL4JWZC7D5 D3R3 R5 R6R2 JW5QCBY R W2 Y C W3 W3 W2 W2 CJW4P2 JW3P4P1 W2W3 Y2 Y1YDH G C RSSTZ-8P3 SDL24VAC/R3AMP CDM/CF1STDDEHUMA09059Fig. 16 -- Interface Fan Board (IFB)COMPRESSORACCUMULATOROUTDOOR COIL INDOOR COILLCSLEGENDHPS – High Pressure SwitchLCS – Loss of Charge SwitchAccurater® Metering De viceArrow indicates direction of flowPositionHP STXV in BypassMeteringPositionC03012Fig. 17 -- Typical Heat Pump Operation, Heating ModeStep 3 — Defrost ControlQuiet ShiftQuiet Shift is a field--selectable defrost mode, which will eliminateoccasional noise that could be heard at the start of defrost cycle andrestarting of heating cycle. It is selected by placing DIP switch 3(on defrost board) in ON position.When Quiet Shift switch is placed in ON position, and a defrost isinitiated, the following sequence of operation will occur. Reversingvalve will energize, outdoor fan will turn off, compressor will turnoff for 30 sec and then turn back on to complete defrost. At thestart of heating after conclusion of defrost reversing valve willde--energize, compressor will turn off for another 30 sec, and theoutdoor fan will stay off for 40 sec, before starting in the Heatingmode.DefrostThe defrost control is a time/temperature control which includes afield--selectable time period (DIP switch 1 and 2 on the board)between defrost cycles of 30, 60, 90, or 120 minutes (factory set at60 minutes). To initiate a forced defrost, two options are availabledepending on the status of the defrost thermostat.If defrost thermostat is closed, speed--up pins (J1) must be shortedby placing a flat head screw driver in between for 5 sec andreleasing, to observe a complete defrost cycle. When the QuietShift switch is selected, compressor will be turned off for two 30sec intervals during this complete defrost cycle, as explainedpreviously. When Quiet Shift switch is in factory default OFFposition, a normal and complete defrost cycle will be observed.If defrost thermostat is in open position, and speedup pins areshorted (with a flat head screw driver) for 5 sec and released, ashort defrost cycle will be observed (actual length is dependentupon the selected Quiet Shift position). When Quiet Shift switch isin ON position, the length of defrost is 1 minute (30 seccompressor off period followed by 30 sec of defrost withcompressor operation). On return to heating operation, compressorwill again turn off for an additional 30 sec and the outdoor fan for40 sec. When the Quiet Shift is in OFF position, only a brief 30sec. cycle will be observed.NOTE: Unit will remain in defrost until defrost thermostatreopens at approximately 65_F (18_C) coil temperature at liquidline or remainder of defrost cycle time.50VT-- A