48PG20-28 Single Package Rooftop Units Electric Cooling/Gas Heating with Electromechanical Controls and PURON® (R-410A) Refrigerant Installation, Start-Up and Service Instructions CONTENTS Page SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 1,2 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-17 Step 1 — Provide Unit Support . . . . . . . . . . . . . . . . . . . . . . . . .
Step 3 — Rig and Place Unit — Inspect unit for transportation damage. See Tables 1-3 for physical data. File any claim with transportation agency. Disconnect gas piping from unit when pressure testing at pressure greater than 0.5 psig. Pressures greater than 0.5 psig will cause gas valve damage resulting in hazardous condition. If gas valve is subjected to pressure greater than 0.5 psig, it must be replaced before use. When pressure testing field-supplied gas piping at pressures of 0.
Fig.
SHIPPING RAILS Fig. 2 — Shipping Rail Removal PG20 MAX WEIGHT (LB) * 3825 PG24 4075 PG28 4300 UNIT SIZE CENTER OF GRAVITY ( IN.) X 66.5 Y Z 36.7 31.4 66.5 70.5 37.0 37.0 31.8 35.2 DOES NOT INCLUDE ERV ( ENERGY RECOVERY VENTILATOR) OPTION. NOTES: 1. Add 150 lb (68 kg) for domestic crating. 2. See label for unit location on roof curb. Fig.
Fig.
Table 1 — Physical Data UNIT 48PG VOLTAGE NOMINAL CAPACITY (Tons) OPERATING WEIGHT (lb) 48 Series (Low Heat) Al/Al* COMPRESSOR Quantity Number of Refrigerant Circuits Oil (ounces) Comp A1, A2, B1 REFRIGERANT TYPE Expansion Device Change Type Operating Charge (lb) Circuit A Circuit B REFRIGERANT SUBCOOLER Heat Exchanger Size Expansion Device CONDENSER COIL Rows...Fins/inch Quantity Length of Tube Sheets (in.) Width (in.) Total Face area (sq. ft) CONDENSER FAN Nominal Cfm (Total, all fans) Quantity...
Table 2 — Fan Motor and Drive Data — Vertical Supply/Return 48PG LOW RANGE Motor Hp Motor Nominal Rpm Maximum Continuous Bhp Maximum Continuous Watts Motor Frame Size Motor Shaft Diameter (in.) Fan Rpm Range Motor Pulley Min. Pitch Diameter (in.) Motor Pulley Max. Pitch Diameter (in.) Blower Pulley Pitch Diameter (in.) Blower Pulley Shaft Diameter (in.) Blower Pulley Type Pulley Center Line Distance (in.) Belt, Quantity...Type...Length (in.
Table 3 — Fan Motor and Drive Data — Horizontal Supply/Return 48PG LOW RANGE Motor Hp Motor Nominal Rpm Maximum Continuous Bhp Maximum Continuous Watts Motor Frame Size Motor Shaft Diameter (in.) Fan Rpm Range Motor Pulley Min. Pitch Diameter (in.) Motor Pulley Max. Pitch Diameter (in.) Blower Pulley Pitch Diameter (in.) Blower Pulley Shaft Diameter (in.) Blower Pulley Type Pulley Center Line Distance (in.) Belt, Quantity...Type...Length (in.
ALIGNMENT HOLE (IN BASE RAIL) For vertical supply and return units, tools or parts could drop into ductwork and cause an injury. Install a 90 degree turn in the return ductwork between the unit and the conditioned space. If a 90 degree elbow cannot be installed, then a grille of sufficient strength and density should be installed to prevent objects from falling into the conditioned space.
NOTE: Dimensions A, A′, B, and B′ are obtained from field-supplied ceiling diffuser. Shaded areas indicate block-off pans. Fig. 9 — Concentric Duct Details Step 6 — Install Flue Hood and Inlet Hood — Flue hood (smaller hood), inlet hood (larger hood), and screens are shipped inside the unit in the fan section. To install, remove the heat panel. The flue hood is attached to the heat section panel from the outside using the screws provided. See Fig. 10.
Step 9 — Make Electrical Connections FIELD POWER SUPPLY — Unit is factory wired for voltage shown on unit nameplate. Be sure to check for correct voltage. When installing units, provide disconnect per NEC (National Electrical Code) of adequate size (MOCP [Maximum Overcurrent protection] of unit is on the informative plate). See Tables 4A and 4B. All field wiring must comply with NEC and local codes. Size wire based on MCA (Minimum Circuit Amps) on the unit informative plate. See Fig.
EQUIP GND NEC TB — — — — facing outward from the unit. Install the filter track with 4 screws provided. 5. Apply seal strip (provided) to back flange of both hood sides where hood side connects to the unit back panel. See Fig. 18. 6. Apply seal strip (provided) to top flange of both hood sides where hood sides connect to the hood top panels. See Fig. 18. 7. Install hood sides to the back panels using the screws from Step 2. The sloped flanges point outward.
Table 4A — Electrical Data (Units Without Optional Powered Convenience Outlet) COMPRESSOR UNIT NOMINAL SIZE VOLTAGE 48HG (3 Ph, 60 Hz) VOLTAGE RANGE No. 1 No. 2 OFM No. 3 Min Max RLA LRA RLA LRA RLA LRA Qty Hp IFM FLA Hp (ea) FLA 3.7 10.6/ 9.6 208/230 187 253 28.2 208 28.2 208 — — 4 0.25 20 460 575 414 506 15.4 104 15.4 104 518 633 12.8 83 12.8 83 — — — — 4 4 0.25 0.25 5 16.7/15.2 7.5 24.2/22 10 30.8/28 3.7 4.8 5 7.6 7.5 11 10 14 5 6.1 7.5 9 10 11 1.5 0.
Table 4B — Electrical Data (Units With Optional Powered Convenience Outlet) COMPRESSOR UNIT NOMINAL SIZE VOLTAGE 48HG (3 Ph, 60 Hz) VOLTAGE RANGE No. 1 No. 2 OFM No. 3 Min Max RLA LRA RLA LRA RLA LRA Qty Hp IFM FLA Hp (ea) 3.7 5 208/230 187 253 28.2 208 28.2 208 — — 4 0.25 1.5 7.5 10 3.7 20 5 460 414 506 15.4 104 15.4 104 — — 4 0.25 0.7 7.5 10 5 575 518 633 12.8 83 12.8 83 — — 4 0.25 0.7 7.5 10 Qty Hp FLA (ea) — — — 10.6/ 9.6 2 1 5.9 — — — 16.7/15.2 2 1 5.9 — — — 24.
LEGEND AND NOTES FOR TABLES 4A AND 4B FLA HACR IFM LRA MCA MOCP NEC OFM RLA — — — — — — — — — LEGEND Full Load Amps Heating, Air Conditioning and Refrigeration Indoor (Evaporator) Fan Motor Locked Rotor Amps Minimum Circuit Amps Maximum Overcurrent Protection National Electrical Code Outdoor (Condenser) Fan Motor Rated Load Amps EXAMPLE: Supply voltage is 460-3-60. AB = 452 v BC = 464 v AC = 455 v 452 + 464 + 455 3 1371 = 3 = 457 Determine maximum deviation from average voltage.
2. Pivot the damper assembly outward until top edge of the damper assembly rests against the inside wall of unit. 3. Secure each damper assembly to unit with 6 screws across top (3 screws provided) and bottom (3 screws from Step 1) of damper. 4. With screws saved from Step 1, install brackets on each side of damper assembly. See Fig. 22. 5. Remove tape from damper blades.
Fig. 21 — Power Exhaust or Barometric Relief Damper Mounting Details Fig.
PRE-START-UP START-UP Use the following information and Start-Up Checklist on page CL-1 to check out unit PRIOR to start-up. Failure to observe the following warnings could result in serious personal injury. 1. Follow recognized safety practices and wear protective goggles when checking or the servicing refrigerant system. 2. Do not operate the compressor or provide any electric power to the unit unless the compressor terminal cover is in place and secured. 3.
Condenser Fans and Motors — Condenser fans and 3. Connect pressure gage to manifold pressure tap. 4. Turn on field-supplied manual gas stop. Temporarily install the jumper wire between “R” and “W1” on TB2. Set thermostat to HEAT and raise set point until heat comes on. 5. After the unit has run for several minutes, verify the supply gas pressure is between 5.5 in. wg to 13.0 in. wg, and the manifold pressure is 2.95 in. wg on horizontal discharge applications and 3.00 on vertical discharge applications.
Table 6 — Fan Performance — 48PGE20 — Vertical Supply/Return Units AIRFLOW (Cfm) 5000 5500 6000 6500 7000 7500 8000 8500 9000 0.2 Rpm 607 652 699 746 A 794 842 891 940 C 990 AIRFLOW (Cfm) 5000 5500 6000 6500 7000 7500 8000 8500 9000 Bhp 1.53 1.90 2.32 2.79 3.33 3.93 4.59 5.32 6.12 Rpm 677 719 763 A 807 851 897 943 B 990 C 1037 1.2 A B C D Rpm 900 933 967 1003 1041 1079 1119 1160 1202 AVAILABLE EXTERNAL STATIC PRESSUSRE (in. wg) 0.4 0.6 0.8 Bhp Rpm Bhp Rpm 1.80 740 2.06 797 2.19 779 2.47 833 A 2.
Table 7 — Fan Performance — 48PGF20 — Vertical Supply/Return Units AIRFLOW (Cfm) 5000 5500 6000 6500 7000 7500 8000 8500 9000 0.2 Rpm 607 652 699 746 A 794 842 891 940 C 990 AIRFLOW (Cfm) 5000 5500 6000 6500 7000 7500 8000 8500 9000 0.4 Bhp 1.53 1.90 2.32 2.79 3.33 3.93 4.59 5.32 6.12 Rpm 677 719 763 A 807 851 897 943 990 B C 1037 1.2 Rpm 900 A 933 967 1003 B 1041 1079 1119 C 1160 D 1202 1.4 Bhp 2.82 3.27 3.79 4.35 4.98 5.67 6.42 7.23 8.
Table 8 — Fan Performance — 48PGD24 — Vertical Supply/Return Units AIRFLOW (Cfm) 5,500 6,000 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 0.2 A C Rpm 633 677 722 767 813 859 906 952 999 1047 AIRFLOW (Cfm) 5,500 6,000 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 0.4 Bhp 1.82 2.21 2.67 3.17 3.74 4.36 5.05 5.81 6.63 7.53 A B C Rpm 703 744 786 828 871 915 959 1004 1049 1094 1.2 Rpm A 921 954 988 B 1024 1060 1098 C 1137 1176 1216 D 1256 1.4 Bhp 3.21 3.70 4.25 4.85 5.51 6.23 7.01 7.86 8.77 9.
Table 9 — Fan Performance — 48PGE24 — Vertical Supply/Return Units AIRFLOW (Cfm) 5,500 6,000 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 0.2 A C Rpm 652 699 746 794 842 891 940 990 1039 1089 AIRFLOW (Cfm) 5,500 6,000 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 0.4 Bhp 1.90 2.32 2.79 3.33 3.93 4.59 5.32 6.12 7.00 7.95 A B C Rpm 719 763 807 851 897 943 990 1037 1085 1133 1.2 Rpm 933 A 967 1003 B 1041 1079 1119 C 1160 1202 D 1244 1287 1.4 Bhp 3.27 3.79 4.35 4.98 5.67 6.42 7.23 8.12 9.
Table 10 — Fan Performance — 48PGF24 Vertical Supply/Return Units AIRFLOW (Cfm) 5,500 6,000 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 0.2 A C Rpm 652 699 746 794 842 891 940 990 1039 1089 AIRFLOW (Cfm) 5,500 6,000 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 0.4 Bhp 1.90 2.32 2.79 3.33 3.93 4.59 5.32 6.12 7.00 7.95 Rpm 719 763 A 807 851 897 943 B 990 1037 C 1085 1133 1.2 A B C D Rpm 933 967 1003 1041 1079 1119 1160 1202 1244 1287 1.4 Bhp 3.27 3.79 4.35 4.98 5.67 6.42 7.23 8.12 9.
Table 11 — Fan Performance — 48PGD28 — Vertical Supply/Return Units AIRFLOW (Cfm) 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 10,500 11,000 11,500 12,000 12,500 0.2 Rpm 750 A 797 845 892 B 939 986 1033 C 1079 1126 1172 D 1219 1265 1311 AIRFLOW (Cfm) 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 10,500 11,000 11,500 12,000 12,500 0.4 Bhp 2.28 2.78 3.34 3.97 4.68 5.46 6.32 7.26 8.28 9.40 10.61 11.91 13.32 Rpm 806 A 853 900 948 B 995 1042 C 1090 1137 1184 D 1232 1279 1326 — 1.
Table 12 — Fan Performance — 48PGE28 — Vertical Supply/Return Units AIRFLOW (Cfm) 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 10,500 11,000 11,500 12,000 12,500 0.2 Rpm 775 A 826 878 B 929 981 1033 C 1085 1137 1190 D 1242 1294 1347 — AIRFLOW (Cfm) 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 10,500 11,000 11,500 12,000 12,500 0.4 Bhp 2.43 2.98 3.60 4.31 5.11 6.00 6.98 8.08 9.28 10.60 12.04 13.60 — Rpm A 825 875 B 925 975 1026 C 1076 1128 1179 D 1230 1282 1333 — — 1.
Table 13 — Fan Performance — 48PGF28 — Vertical Supply/Return Units AIRFLOW (Cfm) 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 10,500 11,000 11,500 12,000 12,500 0.2 Rpm 775 A 826 878 B 929 981 1033 C 1085 1137 1190 D 1242 1294 1347 — AIRFLOW (Cfm) 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 10,500 11,000 11,500 12,000 12,500 0.4 Bhp 2.43 2.98 3.60 4.31 5.11 6.00 6.98 8.08 9.28 10.60 12.04 13.60 — Rpm A 825 875 B 925 975 1026 C 1076 1128 1179 D 1230 1282 1333 — — 1.
Table 14 — Fan Performance — 48PGD20 — Horizontal Supply and Return Units AIRFLOW (Cfm) 5000 5500 6000 6500 7000 7500 8000 8500 9000 0.2 Rpm 862 937 F 1013 1089 G 1166 1243 H 1320 1398 — AIRFLOW (Cfm) 5000 5500 6000 6500 7000 7500 8000 8500 9000 0.4 Bhp 2.65 3.26 3.58 4.48 5.52 6.71 8.07 9.60 — Rpm 917 988 F 1060 G 1133 1207 H 1282 1356 — — 1.2 Rpm F 1112 1171 G 1232 H 1295 1360 — — — — 1.4 Bhp 3.88 4.67 5.57 6.61 7.
Table 15 — Fan Performance — 48PGE20 — Horizontal Supply and Return Units AIRFLOW (Cfm) 5000 5500 6000 6500 7000 7500 8000 8500 9000 0.2 F G H Rpm 875 952 1029 1106 1184 1262 1341 ——- AIRFLOW (Cfm) 5000 5500 6000 6500 7000 7500 8000 8500 9000 Bhp — 0.4 Bhp 2.74 3.38 3.74 4.67 5.75 7.00 8.41 — — F G H Rpm 931 1003 1077 1151 1226 1302 1378 — — 1.2 F G H Rpm 1130 1189 1251 1315 1381 — — — — 1.4 Bhp 4.07 4.90 5.85 6.94 8.
Table 16 — Fan Performance — 48PGF20 — Horizontal Supply and Return Units AIRFLOW (Cfm) 0.2 Rpm 875 952 F 1029 1106 G 1184 H 1262 1341 — — 5000 5500 6000 6500 7000 7500 8000 8500 9000 AIRFLOW (Cfm) 5000 5500 6000 6500 7000 7500 8000 8500 9000 Bhp — 0.4 Bhp 2.74 3.38 3.74 4.67 5.75 7.00 8.41 — — Rpm 931 F 1003 1077 G 1151 1226 H 1302 1378 — — 1.2 Rpm F 1130 G 1189 1251 H 1315 1381 — — — — 1.4 Bhp 4.07 4.90 5.85 6.94 8.
Table 17 — Fan Performance — 48PGD24 — Horizontal Supply and Return Units AIRFLOW (Cfm) 0.2 Rpm 937 F 1013 1089 G 1166 1243 H 1320 1398 — — — 5,500 6,000 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 AIRFLOW (Cfm) 5,500 6,000 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 Bhp — 0.4 Bhp 3.26 3.58 4.48 5.52 6.71 8.07 9.60 — — — Rpm 988 F 1060 G 1133 1207 H 1282 1356 — — — — 1.2 Rpm 1171 G 1232 H 1295 1360 — — — — — — 1.4 Bhp 4.67 5.57 6.61 7.
Table 18 — Fan Performance — 48PGE24 — Horizontal Supply and Return Units AIRFLOW (Cfm) 0.2 Rpm 952 F 1029 1106 G 1184 H 1262 1341 — — — — 5,500 6,000 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 AIRFLOW (Cfm) 5,500 6,000 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 Bhp — 0.4 Bhp 3.38 3.74 4.67 5.75 7.00 8.41 — — — — F G H Rpm 1003 1077 1151 1226 1302 1378 — — — — 1.2 Rpm G 1189 1251 H 1315 1381 — — — — — — 1.4 Bhp 4.90 5.85 6.94 8.
Table 19 — Fan Performance — 48PGF24 — Horizontal Supply and Return Units AIRFLOW (Cfm) 5,500 6,000 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 0.2 Rpm 952 F 1029 1106 G 1184 H 1262 1341 — — — — AIRFLOW (Cfm) 5,500 6,000 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 0.4 Bhp 3.38 3.74 4.67 5.75 7.00 8.41 — — — — F G H Rpm 1003 1077 1151 1226 1302 1378 — — — — 1.2 Rpm G 1189 1251 H 1315 1381 — — — — — — 1.4 Bhp 4.90 5.85 6.94 8.
Table 20 — Fan Performance — 48PGD28 — Horizontal Supply and Return Units AIRFLOW (Cfm) 0.2 Rpm 786 E 842 898 F 955 1012 G 1069 1127 1184 H 1242 1299 1357 — — 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 10,500 11,000 11,500 12,000 12,500 AIRFLOW (Cfm) 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 10,500 11,000 11,500 12,000 12,500 Bhp — 0.4 Bhp 2.50 3.09 3.77 4.55 5.42 6.41 7.51 8.74 10.09 11.58 13.20 — — Rpm 819 E 871 925 F 979 1034 G 1090 1146 1202 H 1258 1315 1372 — — 1.
Table 21 — Fan Performance — 48PGE28 — Horizontal Supply and Return Units AIRFLOW (Cfm) 0.2 Rpm 799 E 856 913 F 971 1029 G 1087 1145 1203 H 1261 1320 1378 — — 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 10,500 11,000 11,500 12,000 12,500 AIRFLOW (Cfm) 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 10,500 11,000 11,500 12,000 12,500 Bhp — 0.4 Bhp 2.58 3.19 3.89 4.69 5.60 6.62 7.75 9.01 10.40 11.93 13.61 — — Rpm E 833 887 F 941 996 1052 G 1108 1165 1222 H 1279 1337 — — — 1.
Table 22 — Fan Performance — 48PGF28 — Horizontal Supply and Return Units AIRFLOW (Cfm) 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 10,500 11,000 11,500 12,000 12,500 0.2 E F G H Rpm 799 856 913 971 1029 1087 1145 1203 1261 1320 1378 — — AIRFLOW (Cfm) 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 10,500 11,000 11,500 12,000 12,500 Bhp — 0.4 Bhp 2.58 3.19 3.89 4.69 5.60 6.62 7.75 9.01 10.40 11.93 13.61 — — Rpm 833 E 887 941 F 996 1052 G 1108 1165 1222 H 1279 1337 — — — 1.
Table 23 — Power Exhaust Fan Performance — 48PG20-28 AIRFLOW (Cfm) 3250 3350 3450 3550 3650 3750 3850 3950 4050 4250 4450 4650 4850 5050 5250 5450 5650 5850 208 V Bhp 1.41 1.44 1.46 1.47 1.49 — — — — — — — — — — — — — ESP 0.32 0.23 0.17 0.13 0.09 — — — — — — — — — — — — — LOW SPEED 230,460,575V Watts ESP Bhp Watts 1580 0.70 1.49 1670 1610 0.63 1.52 1700 1635 0.59 1.55 1730 1645 0.56 1.56 1745 1665 0.53 1.58 1765 — 0.51 1.60 1790 — 0.48 1.62 1810 — 0.45 1.64 1835 — 0.40 1.
Table 25 — Evaporator Fan Motor Specifications (cont) 48PG DRIVE ORIENTATION Low Vertical Mid-Low Vertical Mid-High Vertical High Vertical Low Horizontal Mid-Low Horizontal Mid-High Horizontal High Horizontal Low Vertical Mid-Low Vertical Mid-High Vertical High Vertical Low Horizontal Mid-Low Horizontal Mid-High Horizontal High Horizontal 24 28 MOTOR P/N HD60FK651 HD60FK651 HD60FK651 HD60FK575 HD60FK653 HD60FK653 HD60FK653 HD60FK575 HD62FK652 HD62FK652 HD62FK652 HD62FK57
Table 26 — Accessory/FIOP Static Pressure (in. wg)* — 48PG20-28 COMPONENT Economizer COMPONENT Economizer FIOP — 4,000 0.02 4,500 0.03 5,000 0.04 8,500 0.11 9,000 0.12 9,500 0.13 5,500 0.05 CFM 6,000 0.06 6,500 0.07 7,000 0.08 7,500 0.09 8,000 0.10 CFM 10,000 10,500 11,000 11,500 12,000 0.15 0.16 0.17 0.19 0.20 LEGEND Factory-Installed Option *The static pressure must be added to the external static pressure.
DAMPER ASSEMBLY WIRE HARNESS DAMPER ACTUATOR WIRE TIES PL7 PL7 OUTSIDE AIR ENTHALPY ECONOMIZER BLOCK OFF INDOOR AIR ENTHALPY Fig. 23 — EconoMi$er IV Component Locations (Exploded View) 19 LED ON 18 D 17 LED OFF 16 mA 15 14 LED ON C LED OFF LED ON B 13 12 MAT LOCATION LED OFF LED ON A 11 10 OAT LOCATION LED OFF 9 40 Fig. 24 — Sensor Locations (OAT and MAT) 45 50 55 60 65 70 75 80 DEGREES FAHRENHEIT 85 90 95 100 Fig.
Differential Dry Bulb Control — For differential dry bulb control the standard outdoor dry bulb sensor is used in conjunction with an additional accessory dry bulb sensor (part number CRTEMPSN002A00). The accessory sensor must be mounted in the return airstream. Wiring is provided in the EconoMi$er IV wiring harness. See Fig. 26. In this mode of operation, the outdoor-air temperature is compared to the return-air temperature and the lower temperature airstream is used for cooling.
46 85 90 95 100 105 110 (29) (32) (35) (38) (41) (43) 44 CONTROL CONTROL POINT CURVE APPROX.
Demand Control Ventilation — When using the EconoMi$er IV for demand control ventilation, there are some equipment selection criteria which should be considered. When selecting the heat capacity and cool capacity of the equipment, the maximum ventilation rate must be evaluated for design conditions. The maximum damper position must be calculated to provide the desired fresh air.
3. Use the Up/Down button to select the preset number. See Table 29. 4. Press Enter to lock in the selection. 5. Press Mode to exit and resume normal operation. The custom settings of the CO2 sensor can be changed anytime after the sensor is energized. Follow the steps below to change the non-standard settings: 1. Press Clear and Mode buttons. Hold at least 5 seconds until the sensor enters the Edit mode. 2. Press Mode twice. The STDSET Menu will appear. 3.
On the initial power to the EconoMi$er IV control, it will take the damper up to 21/2 minutes before it begins to position itself. Any change in damper position will take up to 30 seconds to initiate. Damper movement from full closed to full open (or vice versa) will take between 11/2 and 21/2 minutes.
SERVICE This will make cleaning efforts more difficult. Surface loaded fibers must be completely removed prior to using low velocity clean water rinse. Periodic Clean Water Rinse — A periodic clean water rinse is very beneficial for coils that are applied in coastal or industrial environments. However, it is very important that the water rinse is made with very low velocity water stream to avoid damaging the fin edges. Monthly cleaning as described below is recommended.
5. Thoroughly apply Totaline® environmentally sound coil cleaner solution to all coil surfaces including finned area, tube sheets and coil headers. 6. Hold garden sprayer nozzle close to finned areas and apply cleaner with a vertical, up-and-down motion. Avoid spraying in horizontal pattern to minimize potential for fin damage. 7. Ensure cleaner thoroughly penetrates deep into finned areas. 8. Interior and exterior finned areas must be thoroughly cleaned. 9.
To align fan and motor pulleys: 1. Loosen fan pulley setscrews. 2. Slide fan pulley along fan shaft. 3. Make angular alignment by loosening motor from mounting plate. Evaporator Fan Belt Tension Adjustment — To adjust belt tension: 1. Turn off unit power. 2. Slide out fan deck to service position as shown in Evaporator Fan Service and Replacement section above. 3. Loosen fan motor bolts. 4. Move motor mounting plate to adjust to proper belt tension. See Table 30.
Table 30 — Belt Tension Adjustment 48PG 20 24 28 VOLTAGE 230 460 575 230 460 575 230 460 575 A,J 4.8 4.8 5.3 4.8 4.8 5.3 4.5 4.5 4.5 B,K 5.1 5.1 5.1 5.1 5.1 5.1 5.4 5.4 5.4 C,L 5.6 5.6 5.6 5.6 5.6 5.6 5.9 5.9 5.9 BELT TENSION (lb) Unit Model Number Position 10 D,M E,N 4.5 NA 4.5 NA 4.5 NA 4.5 NA 4.5 NA 4.5 NA 4.5 4.5 4.5 4.5 4.5 4.5 Condenser-Fan Adjustment (Fig. 35) G,Q 5.0 5.0 5.0 5.0 5.0 5.0 5.9 5.9 5.9 H,R 5.5 5.5 5.5 5.5 5.5 5.5 4.5 4.5 4.
Refrigerant Charge — Amount of refrigerant charge is listed on unit nameplate. Refer to Carrier GTAC II; Module 5; Charging, Recovery, Recycling, and Reclamation section for charging methods and procedures. Unit panels must be in place when unit is operating during charging procedure. Puron® (R-410A) refrigerant cylinders contain a dip tube which allows liquid refrigerant to flow from the cylinder in an upright position.
4. Set main gas valve to ON position. 5. Set thermostat at setting to call for heat. 6. Remove screw cap covering regulator adjustment screw (see Fig. 40). 7. Turn adjustment screw clockwise to increase pressure or counterclockwise to decrease pressure. 8. Once desired pressure is established, set unit setting for no call for heat, turn off main gas valve, remove pressure-measuring device, and replace 1/8-in. pipe plug and screw cap.
Table 32 — Altitude Compensation* NATURAL GAS ELEVATION (ft) 0-1,999 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 Low Heat 29 29 30 30 30 30 31 31 31 32 NATURAL GAS ORIFICE SIZE† Medium Heat High Heat (6 Cell) 30 29 30 29 31 30 31 30 31 30 31 30 32 31 32 31 32 31 33 32 High Heat (8 Cell) 29 29 30 30 30 30 31 31 31 32 *As the height above sea level increases, there is less oxygen per cubic foot of air. Therefore, heat input rate should be reduced at higher altitudes.
Fig.
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THERMOSTAT/IGC MARKINGS BM — Blower Motor C — Common CM — Inducer Motor CS — Centrifugal Switch G — Fan IFO — Indoor Fan On L1 — Line 1 R — Thermostat Power RT — Power Supply SS — Speed Sensor W — Thermostat Heat W1 — 1st Stage of Heating W2 — 2nd Stage of Heating X — Alarm Output Y1 — 1st Stage of Cooling Y2 — 2nd Stage of Cooling — — — — — — — — — — — LPS LS OAS OFC OFM PEC PEM PL PLP QC QT RAS RS SAT TB TRAN TXV W/AT — — — — — — — — — — — — — — — — — — To Indicate FIOP or Accessory To Indicate C
TROUBLESHOOTING Unit Troubleshooting — Refer to Tables 33-35 and Fig. 46. Table 33 — Cooling Service Analysis PROBLEM Compressor and Condenser Fan Will Not Start. Compressor Will Not Start but Condenser Fan Runs. Compressor Cycles (other than normally satisfying thermostat). Compressor Operates continuously. Excessive Head Pressure. Head Pressure Too Low. Excessive Suction Pressure. Suction Pressure Too Low. CAUSE Power failure. Fuse blown or circuit breaker tripped.
Table 34 — Gas Heating Service Analysis PROBLEM Burners Will Not Ignite. CAUSE Misaligned spark electrodes. No gas at main burners. Water in gas line. No power to furnace. No 24 v power supply to control circuit. Inadequate Heating. Miswired or loose connections. Burned-out heat anticipator in thermostat. Broken thermostat wires. Dirty air filter. Gas input to unit too low. Unit undersized for application. Restricted airflow. Blower speed too low. Limit switch cycles main burners. Too much outdoor air.
IDM — IGC — LEGEND Induced-Draft Motor Integrated Gas Unit Controller NOTE: Thermostat Fan Switch in the “AUTO” position. Fig.
Table 35 — IGC Board LED Alarm Codes LED FLASH CODE On Off 1 Flash 2 Flashes 3 Flashes 4 Flashes 5 Flashes 6 Flashes 7 Flashes 8 Flashes 9 Flashes IGC LED DESCRIPTION Normal Operation Hardware Failure ACTION TAKEN BY CONTROL RESET METHOD — No gas heating. PROBABLE CAUSE — — — Loss of power to the IGC. Check 5 amp fuse on IGC, power to unit, 24V circuit breaker, transformer, and wiring to the IGC. Indoor Fan On/Off Delay 5 seconds subtracted from Power reset.
5. Return EconoMi$er IV settings and wiring to normal after completing troubleshooting. ECONOMI$ER IV TROUBLESHOOTING COMPLETION — This procedure is used to return the EconoMi$er IV to operation. No troubleshooting or testing is done by performing the following procedure. 1. Disconnect power at TR and TR1. 2. Set enthalpy potentiometer to previous setting. 3. Set DCV maximum position potentiometer to previous setting. 4. Set minimum position, DCV set point, and exhaust potentiometers to previous settings.
Copyright 2005 Carrier Corporation Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. PC 111 Catalog No. 534-80211 Printed in U.S.A.
MODEL NO.:___________________________________________ SERIAL NO.:______________________________________________ DATE:_________________________________________________ TECHNICIAN: ____________________________________________ I.
