building codes, the current editions of the National Fuel Gas Code (NFGC) NFPA 54/ANSI Z223.1, and the National Electrical Code (NEC) NFPA 70. In Canada refer to the current editions of the National Standards of Canada CAN/CSA--B149.1 and .2 Natural Gas and Propane Installation codes, and Canadian Electrical Code CSA C22.1 PY4G -- -- B . Recognize safety information.
OPTIONAL RETURN AIR OPENING Training for operators of the lifting equipment should include, but not be limited to, the following: 1. Application of the lifter to the load, and adjustment of the lifts to adapt to various sizes or kinds of loads. 2. Instruction in any special operation or precaution. 3. Condition of the load as it relates to operation of the lifting kit, such as balance, temperature, etc. Follow all applicable safety codes. Wear safety shoes and work gloves.
PY4G -- -- B A150563 Fig.
PY4G -- -- B A150564 Fig.
Dashed lines show cross support location for large basepan units.
CAUTION - NOTICE TO RIGGERS PRUDENCE - AVIS AUX MANIPULATEUR ACCESS PANELS MUST BE IN PLACE WHEN RIGGING. PANNEAUX D'ACCES DOIT ÊTRE EN PLACE POUR MANIPULATION. Use top skid as spreader bar. / Utiliser la palette du haut comme barre de répartition DUCTS MINIMUM HEIGHT: 36" (914.4 mm) HAUTEUR MINIMUM BANDE SCELLANT DOIT ÊTRE EN PLACE AVANT DE PLACER L'UNITÉ SUR LA BASE DE TOIT DETAIL A VOIR DÉTAIL A SEE DETAIL A VOIR DÉTAIL A 50CY502286 2.
PY4G -- -- B Table 1—Physical Data Con’t UNIT SIZE NOMINAL CAPACITY (ton) SHIPPING WEIGHT lb SHIPPING WEIGHT kg COMPRESSOR / QUANTITY REFRIGERANT (R --- 410A) Quantity lb Quantity (kg.) REFRIGERANT METERING DEVICE ORIFICE ID in./mm OUTDOOR COIL Rows...Fins/in. Face Area (sq ft) OUTDOOR FAN Nominal Cfm Diameter in. Diameter (mm) Motor Hp (Rpm) INDOOR COIL Rows...Fins/in. Face Area (sq ft) INDOOR BLOWER Nominal Cooling Airflow (Cfm) Size in. Size (mm) Motor HP (RPM) FURNACE SECTION* Burner Orifice No. (Qty..
! WARNING CARBON MONOXIDE POISONING HAZARD Failure to follow this warning could result in personal injury or death. The venting system is designed to ensure proper venting. The flue hood assembly must be installed as indicted in this section of the unit installation instructions. Install the flue hood as follows: 1. This installation must conform with local building codes and with NFPA 54/ANSI Z223.1 National Fuel Gas Code (NFGC), (in Canada, CAN/CGA B149.1, and B149.2) latest revision.
! WARNING FIRE OR EXPLOSION HAZARD Failure to follow this warning could result in personal injury, death and/or property damage. --Connect gas pipe to unit using a backup wrench to avoid damaging gas controls. --Never purge a gas line into a combustion chamber. Never test for gas leaks with an open flame. Use a commercially available soap solution made specifically for the detection of leaks to check all connections. A fire or explosion may result causing property damage, personal injury or loss of life.
Step 10 — Install Electrical Connections ! WARNING ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death. The unit cabinet must have an uninterrupted, unbroken electrical ground. This ground may consist of an electrical wire connected to the unit ground screw in the control compartment, or conduit approved for electrical ground when installed in accordance with NFPA 70 (NEC) (latest edition) (in Canada, Canadian Electrical Code CSA C22.
PRE--START--UP Standard Connection Run the low--voltage leads from the thermostat, through the inlet hole, and into unit low--voltage splice box. Locate six (seven for 3--phase) 18--gage wires leaving control box. These low--voltage connection leads can be identified by the colors red, green, yellow, brown, blue, and white (See Fig. 10). A gray wire is standard on 3--phase units for connection to an economizer.
4. Verify the following conditions: a. Make sure gas line is free of air. Before lighting the unit for the first time, perform the following with the gas valve in the OFF position: NOTE: If the gas supply pipe was not purged before connecting the unit, it will be full of air. It is recommended that the ground joint union be loosened, and the supply line be allowed to purge until the odor of gas is detected. Never purge gas lines into a combustion chamber.
5. For 3--phase models the evaporator fan will turn on 45 sec. after the flame has been established. The evaporator fan will turn off 45 sec. after the thermostat has been satisfied. For single phase models the evaporator fan will turn on 30 sec. after the flame has been established. The evaporator fan will turn off 90 sec. after the thermostat has been satisfied.
! WARNING FIRE AND UNIT DAMAGE HAZARD Failure to follow this warning could result in personal injury or death and/or property damage. Unsafe operation of the unit may result if manifold pressure is outside this range. 3. Replace regulator cover screw on gas valve (See Fig. 13). 4. Turn off gas supply to unit. Remove manometer from pressure tap and replace pipe plug on gas valve. (See Fig. 11.) Turn on gas to unit and check for leaks.
Table 4 – High Altitude Compensation, Natural Gas -- Single Phase Models Rated Heating Input (Btu/hr), Natural Gas at Installation Altitude Above Sea Level, U.S.A.
PY4G -- -- B A150502 Fig.
PY4G -- -- B A150510 Fig. 14 Cont.
PY4G -- -- B A150508 Fig.
PY4G -- -- B A150511 Fig. 15 Cont.
PY4G -- -- B A150509 Fig.
PY4G -- -- B A150512 Fig. 16 Cont.
Normal Operation Airflow and Temperature Rise The heating section for each size unit is designed and approved for heating operation within the temperature--rise range stamped on the unit rating plate. Table 11 and 12 show the approved temperature rise range for each heating input, and the air delivery cfm at various temperature rises for a given external static pressure. The heating operation airflow must produce a temperature rise that falls within the approved range.
Checking and Adjusting Refrigerant Charge The refrigerant system is fully charged with R--410A refrigerant and is tested and factory sealed. Allow system to operate a minimum of 15 minutes before checking or adjusting charge. ! WARNING EXPLOSION HAZARD Failure to follow this warning could result in death, serious personal injury, and/or property damage. (psig) to determine desired system operating liquid line temperature (See Table 9). 6.
Cooling Fan Speed Set-- up (Dehumidification feature not used) (Single Phase Models): To change cooling speed: 1. Remove existing speed tap wire from the “COOL” terminal on the IGC board. Add the wet coil pressure drop in Table 14 to the system static to determine the correct cooling airflow speed in Table 8 that will deliver the nominal cooling airflow listed in Table 1 for each size. 2. Connect the desired speed tap wire on the “COOL” terminal on the IGC board.
QC6 LOW QC7 QC4 K2 RL3 C8 R1L QCR D2 QC1 C4 JM6 RI2 RI G1JM5 DL 3 AMP D6 DCR C Q1 Q3 OILL C2 QC3 K1 RI0 C9 COM G2 D4 A7 R9 CDM/C HIGH 24VAC/R GAS HEAT AB A15 F1 PY4G -- -- B C0 U1 R4 C3 RL4 D5 D3 C7 JW3 P3 R3 R5 R6 R2 JW7 P2 QCB SDL JW2 Y DH DH DH DH JW4 Y R U JW1 C 24VAC P1 SSTZ-8 Y1/ W2 Y2/ DH G Y C R A09058 Shunt in no dehumidification position Fig. 18 -- Interface Fan Board (IFB) Shunt in dehumidification position A14399 Fig.
PY4G -- -- B Table 9 – Cooling Charging Chart Superheat charging table is derived from optimum performance point. (95_F [35_C] outdoor ambient and (80_F [27_C] dry bulb; 67_F [19_C] wet bulb indoor condition.) Where a dash( --- ---) appears do not attempt to check charge or charge unit under these conditions using the superheat method. (Weigh in method should be used.) A150625 To properly check or adjust charge, conditions must be favorable for subcooling charging.
25 --- 55 (14 --- 31) 25 --- 55 (14 --- 31) 24040 24060 Heating Rise Range oF (oC) Unit Size Table 10 – Dry Coil Air Delivery* -- Horizontal and Downflow Discharge -- Sizes 24--60 208/230VAC -- 1 Phase Motor Wire External Static Pressure (IN. W.C.) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Speed Color CFM 669 580 525 423 303 --- --- ----- --- --BHP 0.09 0.10 0.11 0.11 0.12 --- --- ----- --- --Low1 Blue Heat Rise (oF) 44 51 NA NA NA NA NA Heat Rise (oC) 25 29 NA NA NA NA NA CFM 829 752 680 602 549 455 313 BHP 0.
25 --- 55 (14 --- 31) 25 --- 55 (14 --- 31) 30040 30060 Heating Rise Range oF (oC) Unit Size PY4G Table 10 -- Dry Coil Air Delivery* -- Horizontal and Downflow Discharge -- Sizes 24--60 208/230VAC -- 1 Phase (Cont.) Motor Wire External Static Pressure (IN. W.C.) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Speed Color CFM 669 580 525 423 303 --- --- ----- --- --BHP 0.09 0.10 0.11 0.11 0.
35 --- 65 (19 --- 36) 25 --- 55 (14 --- 31) 36060 36090 Heating Rise Range oF (oC) Unit Size Table 10 -- Dry Coil Air Delivery* -- Horizontal and Downflow Discharge -- Sizes 24--60 208/230VAC -- 1 Phase (Cont.) Motor Wire External Static Pressure (IN. W.C.) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Speed Color CFM 1056 982 911 882 812 740 667 BHP 0.24 0.24 0.24 0.26 0.26 0.27 0.28 Low3 Blue Heat Rise (oF) 42 46 49 51 55 NA NA Heat Rise (oC) 24 25 27 28 31 NA NA CFM 1174 1107 1045 985 914 890 825 BHP 0.32 0.
35 --- 65 (19 --- 36) 25 --- 55 (14 --- 31) 42060 42090 Heating Rise Range oF (oC) Unit Size PY4G Table 10 -- Dry Coil Air Delivery* -- Horizontal and Downflow Discharge -- Sizes 24--60 208/230VAC -- 1 Phase (Cont.) Motor Wire External Static Pressure (IN. W.C.) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Speed Color CFM 1001 902 833 777 717 650 575 BHP 0.13 0.13 0.14 0.14 0.15 0.16 0.17 Low3 Blue Heat Rise (oF) 45 50 54 NA NA NA NA Heat Rise (oC) 25 28 30 NA NA NA NA CFM 1016 950 902 842 783 721 655 BHP 0.13 0.
30 --- 60 (17 --- 33) 35 --- 65 (19 --- 36) 48090 48115 Heating Rise Range oF (oC) Unit Size Table 10 -- Dry Coil Air Delivery* -- Horizontal and Downflow Discharge -- Sizes 24--60 208/230VAC -- 1 Phase (Cont.) Motor Wire External Static Pressure (IN. W.C.) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Speed Color CFM 1378 1344 1295 1260 1216 1179 1135 BHP 0.26 0.27 0.29 0.31 0.31 0.33 0.
35 --- 65 (19 --- 36) 35 --- 65 (19 --- 36) 48130 60090 Heating Rise Range oF (oC) Unit Size PY4G Table 10 -- Dry Coil Air Delivery* -- Horizontal and Downflow Discharge -- Sizes 24--60 208/230VAC -- 1 Phase (Cont.) Motor Wire External Static Pressure (IN. W.C.) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Speed Color CFM 1378 1344 1295 1260 1216 1179 1135 BHP 0.26 0.27 0.29 0.31 0.31 0.33 0.
Heating Rise Range oF (oC) 30 --- 60 (17 --- 33) Unit Size 60115 Table 10 -- Dry Coil Air Delivery* -- Horizontal and Downflow Discharge -- Sizes 24--60 208/230VAC -- 1 Phase (Cont.) Motor Wire External Static Pressure (IN. W.C.) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Speed Color CFM 1330 1277 1232 1191 1147 1103 1060 BHP 0.26 0.27 0.29 0.30 0.31 0.32 0.33 Low3 Blue Heat Rise (oF) NA NA NA NA NA NA NA Heat Rise (oC) NA NA NA NA NA NA NA CFM 1475 1436 1399 1351 1317 1270 1236 BHP 0.35 0.36 0.37 0.38 0.40 0.
35 --- 65 (19 --- 36) 60130 PY4G Table 10 -- Dry Coil Air Delivery* -- Horizontal and Downflow Discharge -- Sizes 24--60 208/230VAC -- 1 Phase (Cont.) Motor Wire External Static Pressure (IN. W.C.) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Speed Color CFM 1330 1277 1232 1191 1147 1103 1060 BHP 0.26 0.27 0.29 0.30 0.31 0.32 0.33 Low3 Blue Heat Rise (oF) NA NA NA NA NA NA NA Heat Rise (oC) NA NA NA NA NA NA NA CFM 1475 1436 1399 1351 1317 1270 1236 BHP 0.35 0.36 0.37 0.38 0.40 0.41 0.
35 --- 65oF (19 --- 36oC) 25 --- 55oF (14 --- 31oC) 36060 36090 Heating Rise Range Unit Orange Black High Pink Med ---Low Med ---High1 Blue Low Red Black High Medium2 Orange Med ---High Pink Med ---Low1 Red Blue Low Medium2 Wire Color Motor Speed CFM Heating Rise (oF) Heating Rise (oC) CFM Heating Rise (oF) Heating Rise (oC) CFM Heating Rise (oF) Heating Rise (oC) CFM Heating Rise (oF) Heating Rise (oC) CFM Heating Rise (oF) Heating Rise (oC) CFM Heating Rise (oF) Heating Rise (
35 --- 65oF (19 --- 36oC) 25 --- 55oF (14 --- 31oC) 42060 42090 Heating Rise Range Unit Orange Black High Pink Med ---Low Med ---High2 Blue Low Red Black High Medium1 Orange Med ---High2 Pink Med ---Low1 Red Blue Low Medium Wire Color Motor Speed CFM Heating Rise (oF) Heating Rise (oC) CFM Heating Rise (oF) Heating Rise (oC) CFM Heating Rise (oF) Heating Rise (oC) CFM Heating Rise (oF) Heating Rise (oC) CFM Heating Rise (oF) Heating Rise (oC) CFM Heating Rise (oF) Heating Rise (
30 --- 60oF (17 --- 33oC) 35 --- 65oF (19 --- 36oC) 48090 48115 Heating Rise Range Unit Orange Black High Pink Med ---Low Med ---High1 Blue Low Red Black High Medium2 Orange Med ---High Pink Med ---Low Red Blue Low1 Medium2 Wire Color Motor Speed CFM Heating Rise (oF) Heating Rise (oC) CFM Heating Rise (oF) Heating Rise (oC) CFM Heating Rise (oF) Heating Rise (oC) CFM Heating Rise (oF) Heating Rise (oC) CFM Heating Rise (oF) Heating Rise (oC) CFM Heating Rise (oF) Heating Rise (
35 --- 65oF (19 --- 36oC) 35 --- 65oF (19 --- 36oC) 48130 60090 Heating Rise Range Unit Orange Black High Pink Med ---Low Med ---High Blue Low1 Red Black High Medium2 Orange Med ---High1 Pink Med ---Low Red Blue Low Medium2 Wire Color Motor Speed CFM Heating Rise (oF) Heating Rise (oC) CFM Heating Rise (oF) Heating Rise (oC) CFM Heating Rise (oF) Heating Rise (oC) CFM Heating Rise (oF) Heating Rise (oC) CFM Heating Rise (oF) Heating Rise (oC) CFM Heating Rise (oF) Heating Rise (
Orange Black High Pink Med ---Low Med ---High1 Blue Low Red Black High Medium2 Orange Med ---High1 Pink Med ---Low Red Blue Low Medium2 Wire Color Motor Speed CFM Heating Rise (oF) Heating Rise (oC) CFM Heating Rise (oF) Heating Rise (oC) CFM Heating Rise (oF) Heating Rise (oC) CFM Heating Rise (oF) Heating Rise (oC) CFM Heating Rise (oF) Heating Rise (oC) CFM Heating Rise (oF) Heating Rise (oC) CFM Heating Rise (oF) Heating Rise (oC) CFM Heating Rise (oF) Heating Rise (oC) CFM Heating
Heating Rise Range 25 --- 55oF (14 --- 31oC) Unit 36060 PY4G Table 12 – Dry Coil Air Delivery -- Downflow Discharge -- Sizes 36--60 3 Phase Models Only (Cont.) Motor Wire External Static Pressure (IN. W.C.) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Speed Color CFM 979 912 859 789 731 654 556 WATTS 202 212 217 221 231 236 245 Low Blue BHP 0.22 0.23 0.23 0.24 0.25 0.25 0.
Heating Rise Range 35 --- 65oF (19 --- 36oC) Unit 36090 Table 13 – Dry Coil Air Delivery -- Downflow Discharge -- Sizes 36--60 3 Phase Models Only (Cont.) Motor Wire External Static Pressure (IN. W.C.) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Speed Color CFM 979 912 859 789 731 654 556 WATTS 202 212 217 221 231 236 245 Low Blue BHP 0.22 0.23 0.23 0.24 0.25 0.25 0.
Heating Rise Range 25 --- 55oF (14 --- 31oC) Unit 42060 PY4G Table 12 -- Dry Coil Air Delivery -- Downflow Discharge -- Sizes 36--60 3 Phase Models Only (Cont.) Motor Wire External Static Pressure (IN. W.C.) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Speed Color CFM 952 882 806 746 671 605 530 WATTS 124 134 140 150 156 166 171 Low Blue BHP 0.13 0.14 0.15 0.16 0.17 0.18 0.
Heating Rise Range 35 --- 65oF (19 --- 36oC) Unit 42090 Table 12 -- Dry Coil Air Delivery -- Downflow Discharge -- Sizes 36--60 3 Phase Models Only (Cont.) Motor Wire External Static Pressure (IN. W.C.) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Speed Color CFM 952 882 806 746 671 605 530 WATTS 124 134 140 150 156 166 171 Low Blue BHP 0.13 0.14 0.15 0.16 0.17 0.18 0.
Heating Rise Range 35 --- 65oF (19 --- 36oC) Unit 48090 PY4G Table 12 -- Dry Coil Air Delivery -- Downflow Discharge -- Sizes 36--60 3 Phase Models Only (Cont.) Motor Wire External Static Pressure (IN. W.C.) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Speed Color CFM 1503 1457 1423 1374 1330 1287 1241 WATTS 225 233 246 254 269 282 292 Low1 Blue BHP 0.24 0.25 0.26 0.27 0.29 0.30 0.
Heating Rise Range 30 --- 60oF (17 --- 33oC) Unit 48115 Table 12 -- Dry Coil Air Delivery -- Downflow Discharge -- Sizes 36--60 3 Phase Models Only (Cont.) Motor Wire External Static Pressure (IN. W.C.) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Speed Color CFM 1503 1457 1423 1374 1330 1287 1241 WATTS 225 233 246 254 269 282 292 Low Blue BHP 0.24 0.25 0.26 0.27 0.29 0.30 0.
Heating Rise Range 35 --- 65oF (19 --- 36oC) Unit 48130 PY4G Table 12 -- Dry Coil Air Delivery -- Downflow Discharge -- Sizes 36--60 3 Phase Models Only (Cont.) Motor Wire External Static Pressure (IN. W.C.) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Speed Color CFM 1503 1457 1423 1374 1330 1287 1241 WATTS 225 233 246 254 269 282 292 Low Blue BHP 0.24 0.25 0.26 0.27 0.29 0.30 0.
Heating Rise Range 35 --- 65oF (19 --- 36oC) Unit 60090 Table 12 -- Dry Coil Air Delivery -- Downflow Discharge -- Sizes 36--60 3 Phase Models Only (Cont.) Motor Wire External Static Pressure (IN. W.C.) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Speed Color CFM 1479 1436 1387 1346 1298 1253 1206 WATTS 224 239 247 262 270 284 300 Low1 Blue BHP 0.24 0.26 0.26 0.28 0.29 0.30 0.
Heating Rise Range 30 --- 60oF (17 --- 33oC) Unit 60115 PY4G Table 12 -- Dry Coil Air Delivery -- Downflow Discharge -- Sizes 36--60 3 Phase Models Only (Cont.) Motor Wire External Static Pressure (IN. W.C.) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Speed Color CFM 1479 1436 1387 1346 1298 1253 1206 WATTS 224 239 247 262 270 284 300 Low Blue BHP 0.24 0.26 0.26 0.28 0.29 0.30 0.
Heating Rise Range Table 12 -- Dry Coil Air Delivery -- Downflow Discharge -- Sizes 36--60 3 Phase Models Only (Cont.) Motor Wire External Static Pressure (IN. W.C.) Unit 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Speed Color CFM 1479 1436 1387 1346 1298 1253 1206 WATTS 224 239 247 262 270 284 300 Low Blue BHP 0.24 0.26 0.26 0.28 0.29 0.30 0.32 Heating Rise (oF) 64 NA NA NA NA NA NA Heating Rise (oC) 36 NA NA NA NA NA NA CFM 1841 1796 1761 1724 1690 1651 1616 WATTS 425 434 453 460 476 485 501 Med ---Low Pink BHP 0.
600 0.03 700 0.04 1500-2200 CFM 16x24x1+18x24x1 (406x610x25+457x610x25) (406x610x25+356x610x25) 600-1400 CFM 12x20x1+12x20x1 (305x508x25+305x508x25) 1200-1800 CFM 16x24x1+14x24x1 FILTER SIZE IN. (MM) 1500-2200 CFM 16x24x1+18x24x1 (406x610x25+457x610x25) (406x610x25+356x610x25) 600-1400 CFM 12x20x1+12x20x1 (305x508x25+305x508x25) 1200-1800 CFM 16x24x1+14x24x1 FILTER SIZE IN. (MM) UNIT SIZE 24 30 36 42 48 60 5.0 3.5, 4.0 COOLING TONS 2.0, 2.5, 3.0 5.0 3.5, 4.0 COOLING TONS 2.0, 2.5, 3.
MAINTENANCE 3. Inspect blower motor and wheel for cleanliness at the beginning of each heating and cooling season. Clean when necessary. For first heating and cooling season, inspect blower wheel bi--monthly to determine proper cleaning frequency. 4. Check electrical connections for tightness and controls for proper operation each heating and cooling season. Service when necessary. 5. Ensure electric wires are not in contact with refrigerant tubing or sharp metal edges. 6.
7. Remove the mounting screw that attaches the burner rack to the unit base (See Fig. 19). 8. Partially slide the burner rack out of the unit (see Fig. 19 and 22). Remove ignitor and sensor wires at the burner assembly. Remove wires to rollout switch. 9. Slide the burner rack out of the unit (See Fig. 19 and 22). 10. To reinstall, reverse the procedure outlined above. 11. Check all connections for leaks. f. Connect 5 pin plug and 4 pin plug to indoor blower motor. g. Reinstall blower access panel (see Fig.
A07680 PY4G Fig. 22 -- Burner Rack Removed Compressor Access Panel Blower Access Panel Control Access Panel Outdoor Fan ! CAUTION UNIT OPERATION HAZARD Failure to follow this caution may result in damage to unit components. A09215 Keep the condenser fan free from all obstructions to ensure proper cooling operation. Never place articles on top of the unit. Fig. 20 -- Unit Access Panels 1. Remove 6 screws holding outdoor grille and motor to top cover. 2.
FAN GRILLE MOTOR A MOTOR SHAFT A08505 MAX DISTANCE BETWEEN TOP OF FAN GRILLE AND BOTTOM OF FAN BLADE IN. 9.0 7.1 8.0 7.6 7.6 7.6 24 30 36 42 48 60 MM 228 180 203 193 193 193 Fig. 23 -- Fan Blade Position Refrigerant Circuit Pressure Switches Annually inspect all refrigerant tubing connections. Pressure switches are protective devices wired into control circuit (low voltage). They shut off compressor if abnormally high or low pressures are present in the refrigeration circuit.
The compressor is an electrical (as well as mechanical) device. Exercise extreme caution when working near compressors. Power should be shut off, if possible, for most troubleshooting techniques. Refrigerants present additional safety hazards. ! WARNING FIRE/EXPLOSION HAZARD Failure to follow this warning could result in personal injury or death and/or property damage. PY4G Wear safety glasses and gloves when handling refrigerants.
R--410A QUICK REFERENCE GUIDE S R--410A refrigerant operates at 50--70 percent higher pressures than R--22. Be sure that servicing equipment and replacement components are designed to operate with R--410A S R--410A refrigerant cylinders are rose colored. S Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400. S R--410A systems should be charged with liquid refrigerant.
Table 17 – Troubleshooting Chart SYMPTOM Compressor and condenser fan will not start.
CAUSE Water in gas line No power to furnace No 24--v power supply to control circuit Burners will not ignite Mis--wired or loose connections Misaligned spark electrodes No gas at main burners Inadequate heating Dirty air filter Gas input to furnace too low Unit undersized for application Restricted airflow Limit switch cycles main burners Poor flame characteristics Incomplete combustion results in: Aldehyde odors, carbon monoxide, sooting flame, floating flame REMEDY Drain. Install drip leg.
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