Carrier 48MPD Installation, Start-up And Service Instructions Manual

Contents

Table 25 — Basic Configuration DataSET POINT SUBFUNCTION DISPLAY DEFAULT RANGEUnit Type TYPE 1 = VAV CV = 0, VAV = 1CV Fan Mode FANM 1 (Continuous) Auto = 0, Cont = 1Economizer MinimumDamper Position MDP 20 percent 0 to 100Heating Occupied* OHSP 68 (F) 55 to 80Cooling Occupied OCSP 78 (F) 55 to 80Cooling Unoccupied UCSP 90 (F) 75 to 95Heating Unoccupied UHSP 55 (F) 40 to 80Static Pressure SPSP 1.5 (in. wg) 0 to 5.0Supply Air Temperature SASP 55 (F) 45 to 70Date and Time TIME dow.hh.mm mm.dd.yy —Override Schedules† OVRD x HR 0 (hrs) 0, 1, 2, 3 or 4Schedule I Periods OCC HH.MM — —LEGENDCV — Constant VolumeVAV — Variable Air Volume*Requires Occupied Heating function enabled.†See text section for discussion and instructions.Gas Pressure Check — Prior to performing the QuickTest, install gas pressure gages and jumper as follows:1. Turn off manual gas stop valve.2. Install a jumper between HR1-NO and HR2-NO.3. Connect pressure gage to gas supply pressure tap. SeeFig. 34.4. Connect pressure gage to manifold pressure tap on eachgas manifold.5. Turn on manual gas stop valve.During the heating portion of the Quick Test, ,both the first and second stage of gas heat will be tested.During the first stage, all of the burner sections will operateat low fire condition (approximately 75% capacity). Duringthe second stage, all of the burner sections will operate at100% capacity.During the Quick Test of stage 2, after the unit has beenoperating for several minutes, verify that the incoming gasline pressure is 5.5 in. wg or greater. Also, verify that themanifold pressure at each burner section is 3.3 in. wg. Ifmanifold pressure must be adjusted, refer to the Gas ValveAdjustment section on page 52.After the unit has been in operation for 5 minutes, checkthe temperature rise across the unit heat exchangers. See theunit informative plate for correct rise range limits. Air quan-tities may need to be adjusted to bring the actual rise withinallowable limits.IMPORTANT: After the Quick Test has been perfor-mend for stage 2, remove the jumper betwen HR1-NOand HR2-NO.Check Supply Fan Rotation — If unit is equippedwith an optional VFD, check for correct fan rotation. Fandirection can be changed by disconnecting power and switch-ing 2 power leads downstream of the VFD output terminalsT1, T2, and T3.START-UPInitial CheckIMPORTANT: Do not attempt to start unit, even mo-mentarily, until all items on the Start-Up Checklist andthe following steps have been completed.1. Verify unit has been installed per the Installation sectionof this literature.2. Certify that all auxiliary components (sensors, controls,etc.) have been installed and wired to the control boxesper these instructions, the Controls and Troubleshootingliterature and the unit wiring label diagrams.3. Verify that pressure hoses (static, duct, etc.) are properlyattached, routed, and free from pinches or crimps that mayaffect proper control operation.4. Set any control configurations that are required (field-installed accessories, etc.). The unit is factory configuredfor all appropriate factory-installed options with theapplicable controls programmed to the default values. Seeunit Controls and Troubleshooting literature for appli-cable configuration values.5. Enter unit set points (if applicable). The unit is shippedwith the set point default values shown in the Con-trols and Troubleshooting literature. If a different set pointis required, change per the example shown under SetPoint Function section in Controls and Troubleshootingliterature.6. Configure schedule subfunctions (if applicable): occu-pied, unoccupied, and holiday periods. See Schedule Func-tion section in Controls and Troubleshooting literature fordetails on setting periods.7. Verify that control time periods programmed meet cur-rent requirements.8. Check all electrical connections to be sure they are tight.38