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• Lennox G43uf Service Manual

. Several models are available in sizes ranging from 2 through 3-1/2 tons. The series uses expansion valves in the outdoor unit and in the indoor unit. SPECIFICATIONS Model No. HP22-261 HP22-311 HP22-411 HP22-461 Face area (sq.ft.) 8.57/ 15.34/.

Service manuals for Lennox Commercial light commercial HVAC equipment. Colt m4 service manual.

SCROLL COMPRESSOR DISCHARGE All major components (indoor blower/coils) must be matched according to Lennox recommendations for the compressor to be covered under warranty. HP22 is pri marily designed for matchup to CB19 series blower coils and ECB19 series electric heat. Refer to the Engineering Handbook for approved system matchups. (figure 4 - 3). When the compressed gas reach If the compressor is replaced, conventional Lennox es the center, it is discharged vertically into a chamber cleanup practices must be used. TERMINAL BOX FIGURE 5 III-UNIT COMPONENTS C-TD1-1 Time Delay Each HP22 is equipped with a Lennox built TD1-1 time A-Transformer delay located in the control box (figure 5). The time delay The contactor, reversing valve, time delay, temperature is electrically connected between thermostat terminal M sensor and defrost timer are all powered by 24VAC sup and the compressor contactor.

DISCHARGE HP22 series units. TEMPERATURE SENSOR TABLE 1 WIRES COMPRESSOR TERMINALS (TO CONTROL BOX) Unit Phase Btuh fl.oz. HP22-261 22,800 62.5 11.6 HP22-311 28,500 13.5 HP22-411 34,000 90.5 HP22-461 39,700 FIGURE 7.Shipped with conventional white oil (Sontex 200LT). 3GS oil may be used if additional oil is required. M-Defrost Timer J-Dual Capacitor The CMC defrost control (figure 9) is a solid state control The compressor and fan in HP22-261,-311,-411 and manufactured by Hamilton Standard. The control pro -461 series units use permanent split capacitor motors.

Vides automatic switching from normal heating operation A single dual'. TABLE 3 SOLID STATE DEFROST TIMER INTERVAL BETWEEN TROUBLESHOOTING DEFROSTS WITH DEFROST PINS DEFROST TIMING JUMPER CONTROL CMC JUMPER CONNECTED TO: TIME CONTROL TIMINGS 30 (T1) 60 (T2) 90 (T3) TIMING PINS TERMINALS NORMAL 30 + 3 60 + 6 90 + 9 14 + 1.4 OPERATION.

4- `COM' Terminal 7- `RST' Terminal Terminal `RST' is not used in this application. Terminal `COM' provides 24VAC Common. 8- `TST' Pins 5- `HLD' Terminal Each board is equipped with a set of test pins for use Terminal `HLD' holds the internal timer in place be in troubleshooting the unit. L10 series line sets as shown in table 4 or field fabricated HP22-411 20 ft. Refrigerant lines. Refer to the piping section of the Lennox L10-65 HP22-461 3/8 in.

Lennox G43uf Service Manual

Service Unit Information Manual (SUI-803-L9) for prop 30 ft. A check valve and expansion valve are used in parallel in VAPOR LINE VALVE the liquid line. The check valve is closed when the unit is in heating mode to force refrigerant through the expan VALVE BODY sion valve. The check valve is open when the unit is in NEW UNIT cooling mode. HEATING CYCLE DEFROST THERMOSTAT FILTER/DRIER WITH INTERNAL CHECK VALVE GAUGE MANIFOLD OPTIONAL EXPANSION VALVE REVERSING VALVE DISCHARGE MUFFLER VAPOR LINE VALVE LIQUID LINE INDOOR UNIT VALVE COMPRESSOR THERMOMETER WELL EXPANSION VALVE NOTE - Arrows indicate direction of refrigerant flow in heating mode.

FIGURE 15 V-CHARGING CAUTION - When using dry nitrogen, a pressure re. HP22-261 weigh the refrigerant into the unit according to the total HP22-311 amount shown on the unit nameplate and in table 6. Re HP22-411 fer to the Lennox Service Unit Information manual SUI for HP22-461 proper procedure. Add refrigerant to increase subcooling and remove FIGURE 16 refrigerant to reduce subcooling.

TABLE 8 SUBCOOLING METHOD - TXV SYSTEMS Model Subcooling (F) D-Oil Charge HP22-261 HP22-311 HP22-411/461 12+2 Table 1 shows the factory oil charge in HP22 series units. TABLE 9 NORMAL OPERATING PRESSURES HP22-261.

5- Check all wiring for loose connections. The correct blower CFM. Refer to Lennox Engineer 6- Check amp-draw on heat pump fan motor. Ing Handbook for Static Pressure and CFM tables. UNIT DIAGRAM LOW VOLTAGE OPERATION SEQUENCE B-Operation Sequence - Low Voltage 6- During heating operation, when outdoor coil drops below 35 + 4 F, the defrost thermostat closes.

1- Transformer in indoor unit supplies 24VAC power to When defrost thermostat closes, defrost timer begins the thermostat and outdoor unit controls. LINE VOLTAGE OPERATION SEQUENCE C-Operation Sequence - Line Voltage 3- Compressor terminal C is energized by L1 through Single Phase Units the contactor contacts. Terminal R is powered by L2 through the contactor (powered at all times). Termi 1- Compressor contactor is energized by indoor ther mostat demand. D-Complete Diagrams Page 16a.