Carrier 48GH- Manuals

Carrier 48GH– User Manual, Manual in PDF format online.

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User Manual
Manual

User Manual Carrier 48GH

Summary

Page 2 - SAFETY CONSIDERATIONS; Htst; INTRODUCTION; Btuh of rated cooling capacity. See Tables 1 and 4; IMPORTANT —; GENERAL

ge 16 17 20 22 lOX a )36; O SAFETY CONSIDERATIONS Installation, start-up and servicing of this equip ment can be hazardous due to system pressures, electrical components and equipment location (roofs, elevated structures, etc.). Only trained, qualified installers and service mechanics should instal...

Page 3 - to; Table 1 — Installation

Unit must remain in an upright position during all rigging and moving operations. Unit must be level for proper condensate drainage; therefore, ground- level pad or field-supplied mounting curb must be level before setting unit in place. ROOFTOP INSTALLATION CAUllONt When ìnstaHjjig «mt <m a roof...

Page 4 - not undersize the tube. Pitch drain tube downward; Fig. 3 — Condensate Trap; CAUTION: Venting system is designed to en; allation Data

3/4-in. galvanized pipe,“ or 7/€-in. plastic pipe. Do not undersize the tube. Pitch drain tube downward at a slope of at least 1 in. in every 10 ft of horizontal run. Be sure to check drain tube for leaks. Condensate water can be drained directly onto roof in rooftop installations (where permitted) ...

Page 5 - IP; Step 2 — Make Gas Piping Connections; cast-iron or galvanized pipe. Check local utility for; Step 3 — Make Duct Connections

IP NOTE: Screw holes in vent stack extension and unit top are positioned to ensure proper orientation when installed. Refer to Fig. 4 and install vent cap as follows: 1. Place combustion-air duct over combustion-air opening in unit top, and line up screw holes in duct with holes in top. Secure duct ...

Page 6 - Table 2 — Electrical Data; Step 4 — Make Wiring Connections; Do not use gas piping

Table 2 — Electrical Data MODEL 48 SERIES V-PH OPER VOLTAGE RANGE TOTAL AMPS MAX BRANCH CIRCUIT FUSE SIZE (Amps)* MCA MIN WIRE SIZE (AWG)t MAX WIRE LENGTH (ft)t Min Max GL018 320 208-230-1 197 253 11 4 20 13.8 14 67 GL024 320 208-230-1 197 253 160 30 194 12 76 GH024 320 208-230-1 197 253 17 3 30 20 ...

Page 7 - must be affixed

1. Make all electrical connections in accordance with National Electrical Code and local elec trical codes governing such wiring. 2. Use only copper conductor for connections between field-supplied electrical disconnect switch and the unit. Do not use aluminum or copper-clad aluminum wire. 3. Ensur...

Page 8 - Unit Preparation; WARNiNG/DANGER: Failure to observe ifee

SINGLE-STAGE HEAT & COOL-MANUAL CHANGEOVER (p ® I FIELD I SPLICE CONTACTOR TERMINALS (SEE UNIT WIRING LABEL) b ^ ^ V] I] -J 3 O >• GÛ a: LOW-VOLTAGE PIGTAIL LEADS .POWER I SUPPLY CONTROL BOX I / | FIELD-SUPPLIED HIGH-VOLTAGE PIGTAIL LEAD / „"gCONNECT HIT I FIELD-SUPPLIED CONDUIT 3-PHASE U...

Page 9 - Heating Section Start-Up and Adjustments; CAUTION Complete required procedures; Do not redtill orifices under any

3. Make following inspections; a. Inspect for shipping and handling damages such as broken lines, loose parts, disconnected wires, etc. b. Inspect for oil at all refrigerant tubing connec tions and on unit base. Detecting oil generally indicates a refrigerant leak. Leak-test all refrigerant tubing ...

Page 10 - CAUTION WbsD adjusting ihe gas input, do; more than; above or below setting shown in; To decrease input: Turn screw counterclockwise.

Table 3 — Rated Gas Inputs (Btuh) for Various Burner Orifices at Indicated Manifold Pressures* NUMBER OF ORIFICES MANIFOLD NATURAL GAS LP (Propane) GAS MODEL 48 P Nat KfcSSUHt (in. wg) LP (Propane) Orifice Part No. Heating Input (Btuh)t Orifice Part No Heating Input (Btuh)t GL018,024,030 2 3 5 105 L...

Page 11 - clean and free of deposits before adjusting primary; Fig. 8 — Burner Flames

# Proceed as follows to measure and change manifold pressure: a. Turn off gas to unit. b. Remove pipe plug on gas valve outlet identified as PRESS TAP, then connect manometer at this point. c. Turn on gas to unit and start heating section. d. Measure and change manifold pressure with all burners fir...

Page 12 - Cooling Section Start-Up and Adjustments; compressor; pressors. Gages must be calibrated for accuracy.

Refer to Cooling Section Start-Up and Adjust ments — INDOOR AIRFLOW AND AIRFLOW ADJUSTMENTS of these instructions to adjust heating airflow when required. LIMIT AND PRESSURE SWITCHES — Furnaee limit switch (see Fig. 9) closes gas valve if leaving-air temperature exceeds 175 F. Normally closed limit...

Page 13 - Bivtk; ojì; my

Table 5 — Refrigerant (R-22) Charge Check Charts* MODEL 48 EVAPORATOR AIR INLET CONDENSER AIR INLET TEMP (F) WET BULB (F) 65 70 75 80 85 90 95 100 55 138 156 174 192 211 229 247 265 60 143 161 178 196 213 231 249 266 GL018 65 148 165 182 199 216 233 251 268 70 153 169 186 202 219 236 252 269 75 158 ...

Page 15 - Table 6 — Air Delivery (Cfm) at Indicated External

Table 6 — Air Delivery (Cfm) at Indicated External Static Pressure and Voltage* (Cont) M O D E Ì. 4 8 U N IT V O L T S / E X T E R N A L S T A T IC P R E S S U R E ( in w g ) B L O W E R M O T O R S P E E D A P P L IC A - 0 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 SERIES P H A S E (6 0 -H z ) T IO N t 2 0 ...

Page 16 - pilot fails; Cooling

CONTROLS — All compressors have the following internal-protection controls: High-Pressure Relief Valve — This valve opens when pressure differential between low and high side becomes excessive. Compressor Overload — This overload interrupts power to compressor when either current or internal tempera...

Page 17 - SERVICE

FIELD POWER SUPPLY SCHEMATIC DIAGRAM The set of normally open contacts of energized indoor fan relay (cooling) closes and completes circuit thru indoor fan motor. The blower motor starts instantly. The cooling cycle remains on until room tempera ture drops to a point that is slightly below cooling ...

Page 18 - trkal power to the unit before performing; Top Removal; to prevent damage to the seal that isolates heat; Air Filter

Note to Equipment Owner: Consult your local dealer about the availability of a maintenance contract. WARNING; The ability to properly perform maintenance on this equipment require? cer tain expertise, mechanical skills, tools and equipment. If you do not possess these, do not attempt to perform any...

Page 19 - WARNiNG: Turn off gas suppiy»; then; dis; Heating Section

WARNiNG: Turn off gas suppiy» then dis connect electricai power to unit l^fore cieaning and iubncatbg biower motor and wheei. Clean and lubricate blower motor and wheel as follows; 1. Remove and disassemble blower assembly as follows: a. Remove blower and control access panels. b. Refer to unit wir...

Page 21 - CAUSE

TROUBLESHOOTING CHARTS Table 7 — Heating Service Analysis Chart SYMPTOM Pilot Will Not Light Burners Will Not Ignite Inadequate Heating Poor Flame Characteristics CAUSE No spark at electrode Spark shorting out to main burner ____ __ No gas at pilot burner Water in gas line No power to furnaceNo 24-v...