Carrier aquazone 50RTG Installation, Start-up And Service Instructions Manual

Contents

Carrier aquazone 50RTG Installation, Start-up And Service Instructions Manual Manual pdf 15 page image

1510. System Controls: To ensure that no catastrophic systemfailures occur, verify that system controls are functioningand that the sequencing is correct.11. Freeze Protection for Water System: Verify that freezeprotection is provided for the building loop water systemwhen outdoor design conditions require it. Inadequatefreeze protection can lead to expensive tower and systempiping repairs.12. System Water Loop: Verify that all air is bled from thesystem. Air in the system impedes unit operation andcauses corrosion in the system piping.13. Unit Filters: To avoid system damage, check that the unitfilter is clean.14. Unit Fans: Manually rotate fans to assure free rotation.Ensure that fans are properly secured to the fan shaft. Donot oil fan motors on start-up since they are lubricated atthe factory.15. System Control Center: Examine the system controland alarm panel for proper installation and operation toensure control of the temperature set-points for operationof the system’s heat rejector and boiler (when used).16. Miscellaneous: Note any questionable aspects of theinstallation.17. Air Coil: To obtain maximum performance, the air coilshould be cleaned before starting the unit. A ten percentsolution of dishwasher detergent and water is recom-mended for both sides of the coil. Rinse thoroughly withwater.FIELD SELECTABLE INPUTSJumpers and DIP (dual in-line package) switches on thecontrol board are used to customize unit operation and can beconfigured in the field.C Control Jumper Settings (See Fig. 4)WATER COIL FREEZE PROTECTION (FP1) LIMITSETTING — Select jumper 3, (JW3-FP1 Low Temp) tochoose FP1 limit of 10 F or 30 F. To select 30 F as the limit,DO NOT clip the jumper. To select 10 F as the limit, clip thejumper.AIR COIL FREEZE PROTECTION (FP2) LIMIT SET-TING — Select jumper 2 (JW2-FP2 Low Temp) to chooseFP2 limit of 10 F or 30 F. To select 30 F as the limit, DO NOTclip the jumper. To select 10 F as the limit, clip the jumper.ALARM RELAY SETTING — Select jumper 1 (JW1-AL2Dry) for connecting alarm relay terminal (AL2) to 24 vac (R)or to remain as a dry contact (no connection). To connect AL2to R, do not clip the jumper. To set as dry contact, clip thejumper.C Control DIP Switches — The C Control has 1 DIPswitch block with two switches. See Fig. 4.PERFORMANCE MONITOR (PM) — DIP switch 1 willenable or disable this feature. To enable the PM, set the switchto ON. To disable the PM, set the switch to OFF.STAGE 2 — DIP switch 2 will enable or disable compressordelay. Set DIP switch to OFF for stage 2 in which the compres-sor will have a 3-second delay before energizing.NOTE: The alarm relay will not cycle during Test mode ifswitch is set to OFF, stage 2.D Control Jumper SettingsWATER COIL FREEZE PROTECTION (FP1) LIMITSETTING — Select jumper 3, (JW3-FP1 Low Temp) tochoose FP1 limit of 10 F or 30 F. To select 30 F as the limit, DONOT clip the jumper. To select 10 F as the limit, clip the jumper.AIR COIL FREEZE PROTECTION (FP2) LIMIT SET-TING — Select jumper 2 (JW2-FP2 Low Temp) to chooseFP2 limit of 10 F or 30 F. To select 30 F as the limit, DO NOTclip the jumper. To select 10 F as the limit (for anti-freeze sys-tems), clip the jumper.ALARM RELAY SETTING — Select jumper 4 (JW4-AL2Dry) for connecting alarm relay terminal (AL2) to 24 vac (R)or to remain as a dry contact (no connection). To connect AL2to R, do not clip the jumper. To set as dry contact, clip thejumper.LOW PRESSURE SETTING — The D Control can be con-figured for Low Pressure Setting (LP). Select jumper 1 (JW1-LP Norm Open) for choosing between low pressure inputnormally opened or closed. To configure for normally closedoperation, do not clip the jumper. To configure for normallyopen operation, clip the jumper.D Control DIP Switches — The D Control has 2 DIPswitch blocks. Each DIP switch block has 8 switches and islabeled either S1 or S2 on the circuit board.DIP SWITCH BLOCK 1 (S1) — This set of switches offersthe following options for D Control configuration:Performance Monitor (PM) — Set switch 1 to enable or dis-able performance monitor. To enable the PM, set the switch toON. To disable the PM, set the switch to OFF.Compressor Relay Staging Operation — Switch 2 will en-able or disable compressor relay staging operation. The com-pressor relay can be set to turn on with stage 1 or stage 2 callfrom the thermostat. This setting is used with dual stage units(units with 2 compressors and 2 D controls) or in master/slaveapplications. In master/slave applications, each compressor andfan will stage according to its switch 2 setting. If switch is set tostage 2, the compressor will have a 3-second delay before ener-gizing during stage 2 demand.NOTE: If DIP switch is set for stage 2, the alarm relay will notcycle during Test mode.Heating/Cooling Thermostat Type — Switch 3 provides selec-tion of thermostat type. Heat pump or heat/cool thermostatscan be selected. Select OFF for heat/cool thermostats. When inheat/cool mode, Y1 is used for cooling stage 1, Y2 is used forcooling stage 2, W1 is used for heating stage 1 and O/W2 isused for heating stage 2. Select ON for heat pump applications.In heat pump mode, Y1 used is for compressor stage 1, Y2 isused for compressor stage 2, W1 is used for heating stage 3 oremergency heat, and O/W2 is used for RV (heating or cooling)depending upon switch 4 setting.O/B Thermostat Type — Switch 4 provides selection for heatpump O/B thermostats. O is cooling output. B is heating out-put. Select ON for heat pumps with O output. Select OFF forheat pumps with B output.Dehumidification Fan Mode (Not used on 50RTG) — Switch5 provides selection of normal or dehumidification fan mode.Select OFF for dehumidification mode. The fan speed relaywill remain OFF during cooling stage 2. Select ON for normalmode. The fan speed relay will turn on during cooling stage 2in normal mode.Switch 6 — Not used.Boilerless Operation — Switch 7 provides selection of boiler-less operation and works in conjunction with switch 8. Inboilerless operation mode, only the compressor is used forheating when FP1 is above the boilerless changeover tempera-ture set by switch 8 below. Select ON for normal operation orselect OFF for boilerless operation.IMPORTANT: Jumpers and DIP switches should onlybe clipped when power to control board has been turnedoff.