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Related Manuals for Lennox HS21 Series
Summary of Contents for Lennox HS21 Series
- Page 1 Service Literature Page 1...
- Page 2 Nominal Tonnage Liquid line in. (mm) o.d. connection (sweat) 3/8 (9.5) Suction line in. (mm) o.d. connection (sweat) 7/8 (22.2) 1 1/8 (28.5) Outer coil 21.77 (2.02) 24.06 (2.24) Net face area Net face area sq ft (m sq. ft. (m Inner coil 21.11 (1.96) 23.33 (2.17)
- Page 3 Page 3...
- Page 4 POTENTIAL HIGH SPEED LOW SPEED RELAY (K31) CONTACTOR CONTACTOR (K69) (K1) TWO SPEED CONTROL (A14) DUAL COMPRESSOR DISCONNECT CAPACITOR START CAPACITOR (C7) (C12) TRANSFORMER (T19) LOW SPEED HIGH SPEED OUTDOOR FAN CONTACTOR CONTACTOR RELAY (K10) (K1) (K69) TWO SPEED CONTROL (A14) FAN CAPACITOR DISCONNECT...
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Page 5: Electrostatic Discharge (Esd)
All major components (indoor blower/coils) must be All units are equipped with a line voltage to 24VAC matched according to Lennox recommendations for the transformer which supplies power to unit controls as compressor to be covered under warranty. Refer to Engi shown in table 1. - Page 6 K31 contacts and assists the compressor in starting. When K1 energizes, the compressor immediately The TSC (A14) two speed control (figure 7) is a Lennox built begins start up. K31 remains de energized during compres control designed for use with two speed condensing units.
- Page 7 All units are equipped with a SPST N.C. low pressure switch mounted on the compressor suction line. The switch All compressors are rated at 208/230 VAC and may be single opens, shutting off the compressor, when suction line pres phase or three phase. All compressors are equipped with sure drops below 25+5 psig.
- Page 8 The TSC (A14) two speed control contains relays which energize compressor operation in response to thermostat demand. High speed operation can be energized and de energized without passing through low speed. The control also contains safety timed off delays and compressor over temperature sensing which protect the compressor.
- Page 9 JP44 1 24VAC POWER (INPUT) JP44 2 24VAC COMMON JP44 3 24VAC (SPARE, NOT USED) JP44 4 2nd STAGE THERMOSTAT DEMAND JP44 5 THERMOSTAT COMMON (C) JP44 6 1st STAGE THERMOSTAT DEMAND JP44 7 24VAC FROM SAFETY SWITCHES TO INTERNAL CONTACTOR COIL (INPUT) JP44 8 HIGH SPEED (24VAC OUTPUT) JP44 9...
- Page 10 Latch 3: After the unit operates in low speed for 30 minutes consecutively, it switches to high speed until low speed demand is satisfied. Recall: Used in conjunction with the bypass button to recall the stored problem codes. Test: Used in conjunction with the control button to start test mode.
- Page 11 push will display additional codes until the last one, which will stay on with additional button pushes. Hold the button down until the lights go off (approximately five seconds) to erase the DISPLAY LIGHTS CODE CODE CONDITION CONDITION memory. The control has a nonvolatile memory that stores the NUMBER 63 most recent diagnostic codes.
- Page 12 (sweat connections). Use Lennox L10 series line sets as shown in table 6 or field fabri Code 15 is displayed when the mode jumper is not in place. cated refrigerant lines. Install filter drier, provided with unit, in Make sure jumper is placed securely across the selected set the liquid line as close as possible to the expansion device.
- Page 13 Replace stem cap, finger tighten then tighten an addi tional 1/6 turn. A full service non backseating suction line service valve is used on all HS21 series units. Different manufacturers of valves may be used. All suction line service valves function the same way, differences are in construction.
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Page 14: Service Port
DANGER 1- Remove stem cap with an adjustable wrench. 2- Use service wrench and 5/16" hex head extension turn stem clockwise to seat the valve. Tighten firmly. Replace stem cap. Tighten finger tight, then tighten an additional 1/6 turn. The unit is factory charged with the amount of HCFC 22 refrigerant indicated on the unit rating plate. - Page 15 After evacuation has been completed, close gauge manifold service valves. Disconnect vacuum pump Evacuating the system of non condensables is critical for from manifold center port and connect refrigerant proper operation of the unit. Non condensables are de drum. Pressurize system slightly with refrigerant to fined as any gas that will not condense under break vacuum.
- Page 16 F (TXV) foam rubber weatherstrip installed along the top edge (be tween the control box and the cabinet). Factory oil charge in all HS21 series units is 70 fl. oz. Suniso 3GS. SCREWS WITH RUBBER WASH ERS. WASHERS PREVENT WATER...
- Page 17 Figure 14 shows single phase compressor windings. This compressor has a two speed capacitor start, capac itor run motor. For starting, the start and run capacitors are in parallel to provide the proper starting torque. The start capacitor is disconnected by the start relay when the compressor comes up to speed.
- Page 18 Page 18...
- Page 20 14-Outdoor fan B4 is energized when contactor K1 contacts L1 T1 and L2 T2 close. 1- Line voltage feeds through L1 and L2 to energize outdoor transformer T19 and outdoor 15-As the compressor nears full speed, potential relay K31 energizes and K31 con unit.
- Page 21 Page 21...
- Page 23 1- Line voltage feeds through L1, L2, and L3 to energize outdoor transformer T19 and 14-1st stage cooling demand energizes TB15 Y1. TB15 Y1 energizes TSC terminal outdoor unit. Crankcase heater is energized through relay K10 1 outdoor fan contacts. JP44 6 and relay K10.
- Page 24 SINGLE PHASE LINE VOLTAGE FIELD WIRING THREE PHASE LINE VOLTAGE FIELD WIRING (Black) (Orange) CIRCUIT BREAKER Page 24...