Carrier SINGLE PACKAGE ROOFTOP UNITS ELECTRIC COOLING/GAS- Manuals

Step 3 — Field Fabricate Ductwork — Secure all ducts to building structure. Use flexible duct connectors be-tween unit and ducts as required. Insulate and weatherproofall external ductwork, joints, and roof openings with counterflashing and mastic in accordance with applicable codes. Ducts passing t...

Step 6 — Trap Condensate Drain — See Fig. 11 for drain location. One 3 ⁄ 4 -in. half coupling is provided inside unit evaporator section for condensate drain connec-tion. An 8 1 ⁄ 2 in. x 3 ⁄ 4 -in. diameter and 2-in. x 3 ⁄ 4 -in. diameter pipe nipple, coupled to standard 3 ⁄ 4 -in. diameter elbows,...

Step 8 — Make Electrical Connections FIELD POWER SUPPLY — Unit is factory wired for volt-age shown on unit nameplate. When installing units, provide a disconnect per NEC (National Electrical Code) of adequate size (Table 2). All field wiring must comply with NEC and local requirements. Route power a...

Use the following formula to determine the percent volt- age imbalance. % Voltage Imbalance: = 100 x max voltage deviation from average voltage average voltage EXAMPLE: Supply voltage is 460-3-60. AB =452 vBC =464 vAC =455 v Average Voltage = 452 +464 +455 3 = 1371 3 = 457 Determine maximum deviatio...

START-UP Use the following information and Start-Up Checklist on page CL-1 to check out unit PRIOR to start-up. Unit Preparation — Check that unit has been installed in accordance with these installation instructions and appli-cable codes. Compressor Mounting — Loosen the compressor hold- down bolts...

Table 4 — Fan Performance Data, 48HJ017 Units AIRFLOW (CFM) EXTERNAL STATIC PRESSURE (in. wg) 0.2 0.4 0.6 0.8 1.0 Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp 4500 630 805 0.9 741 1059 1.2 846 1341 1.5 945 1653 1.9 1039 1993 2.2 4800 659 943 1.1 765 1208 1.4 865 1497 1.7 961...

Table 5 — Fan Performance Data, 48HJ025 Units AIRFLOW (CFM) EXTERNAL STATIC PRESSURE (in. wg) 0.2 0.4 0.6 0.8 1.0 Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp 6000 800 1732 1.88 891 2047 2.22 975 2376 2.58 1055 2728 2.96 1133 3104 3.37 6500 853 2134 2.32 939 2471 2.68 1018 2...

Table 7 — Accessory/FIOP Economizer Static Pressure (in. wg) UNIT 480HJ UNIT VOLTAGE CFM ECONOMIZER PRESSURE DROP 015, 017 All 3,750 .03 4,000 .03 5,000 .05 6,000 .07 7,500 .10 025 All 6,000 .07 7,200 .09 9,000 .11 10,000 .12 LEGEND BHP — Brake Horsepower FIOP — Factory-Installed OptionNOTES:1. The ...

SERVICE Before performing service or maintenance operations onunit, turn off main power switch to unit. Electrical shockcould cause personal injury. Cleaning — Inspect unit interior at beginning of each heat- ing and cooling season and as operating conditions require.Remove unit top panel and/or sid...

FAN SHAFT BEARINGS — For 015 units, the bearings arepermanently lubricated. No field lubrication is required. For017 and 025 units, the bearings are of the pillow block typeand have grease fittings. The bearing opposite the motor endhas an extended tube line so it can be lubricated from themotor sid...

SERVICE AND REPLACEMENT (See Fig. 30) — The48HJ017,025 units use a fan motor mounting system thatfeatures a slide-out motor mounting plate. To replace or serv-ice the motor, slide out the bracket. 1. Remove the evaporator-fan access panel and the heat- ing control access panel. 2. Remove the center ...

5. Set the outdoor-air thermostat (OAT), located in the econo- mizer section of the unit to 75 F. 6. If the outdoor temperature is below 75 F, the econo- mizer will control the mixed air with the mixed-air sen-sor. If the outdoor air is above 75 F, place a jumper aroundthe contacts of the OAT. 7. Ju...

Pilot Adjustment 1. Set system selector switch at OFF position to shut off unit. Turn off power to unit. 2. Remove screw cap cover on pilot gas valve to expose adjusting screw (See Fig. 36). 3. Turn valve knobs to pilot position.4. Turn on power to unit. Set system selector switch to HEAT position a...

PACKAGED SERVICE TRAINING Our packaged service training programs provide an excellent way to increase your knowledge of theequipment discussed in this manual. Product programs cover: • Unit Familiarization• Installation Overview • Maintenance• Operating Sequence A large selection of product, theory,...