Lennox HS26 Series Manual Download Page 16

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Page 16

B−Unit Diagram HS26−018/060−2P (Late Models)

Operation Sequence

1−

Cooling demand energizes thermostat terminal Y. Voltage from terminal Y passes through low pressure
switch and the timed off control (TOC), which energizes K1 compressor contactor coil (provided 5 minute
delay is satisfied).

2−

K1−1 and K1−2 contacts close energizing B1 compressor and B4 outdoor fan.

3−

When cooling demand is satisfied, K1−1 and K1−2 contacts open de−energizing compressor and outdoor fan.
Timed off control begins 5 minute off time.

Summary of Contents for HS26 Series

Page 1: ... 311 HS26 411 HS26 461 Outdoor Coil Condenser Fan HCFC 22 charge furnished Face area sq ft Tube diameter in No of Rows Fins per inch Diameter in No of Blades Motor hp Cfm RPM Watts Liquid line connection Suction line connection HS26 261 HS26 311 HS26 411 HS26 461 Model No Line voltage data 60hz 1 phase Compressor Rated load amps Power factor Locked rotor amps Condenser Fan Motor Full load amps Loc...

Page 2: ...ft 7 6 m length of refrigerant lines ELECTRICAL DATA Late Model Model No HS26 018 HS26 024 HS26 030 HS26 036 HS26 042 Line voltage data 60hz 208 230v 1ph 208 230v 1ph 208 230v 1ph 208 230v 1ph 208 230v 3ph 208 230v 1ph 208 230v 3ph Rated load amps 8 4 10 3 13 5 16 0 10 3 18 0 12 5 Compressor Power factor 0 97 0 96 0 96 0 96 0 82 0 94 0 82 Locked rotor amps 47 56 72 5 88 77 104 88 Condenser Coil Fu...

Page 3: ... into the out er crescent shaped gas pocket created by the two scrolls figure 4 1 The centrifugal action of the orbiting scroll seals off the flanks of the scrolls figure 4 2 As the orbiting motion continues the gas is forced toward the center of the scroll and the gas pocket becomes compressed figure 4 3 When the compressed gas reaches the center it is dis charged vertically into a chamber and di...

Page 4: ...actors See wiring diagrams for specific unit Late model three phase units use three pole contactors The contactor is energized by indoor thermostat terminal Y when thermostat demand is present CAUTION Some HS26 units use single pole contactors One leg of the compressor capacitor and condenser fan are connected to line voltage at all times Po tential exists for electrical shock resulting in inju ry...

Page 5: ...ated in the control box figure 6 The time delay is electrically connected be tween thermostat terminal Y and the compressor contactor Between cycles the compressor contactor is delayed for 5 minutes 2 minutes At the end of the delay the compres sor is allowed to energize When thermostat demand is sat isfied the time delay opens the circuit to the compressor contactor coil and the compressor is de ...

Page 6: ...e drops below 130_F 14_F 54_C 8_C The sensor can be accessed by prying off the snap plug on top of the compressor see figure 7 Make sure to securely seal the limit after replacement The limit pigtails are lo cated inside the unit control box Figure 8 shows the ar rangement of compressor line voltage terminals and dis charge sensor pigtails Table 1 Early Models HS 26 Unit Vac Phase LRA RLA Oil fl o...

Page 7: ...is nor mally closed and is permanently adjusted to trip open at 410 10 psi See figure 5 or 6 for switch location COMPRESSOR TERMINAL BOX C S R COMPRESSOR TERMINALS FIGURE 8 WARNING COMPRESSOR MUST BE GROUNDED DO NOT OPERATE WITHOUT PROTECTIVE COV ER OVER TERMINALS DISCONNECT ALL POWER BEFORE REMOVING PROTECTIVE COVER DISCHARGE CAPACITORS BEFORE SERVICING UNIT COMPRESSOR WIRING DIA GRAM IS FURNISHE...

Page 8: ...1 1 8 in 29 m Field Fabricated Field Fabricated 511 3 8 in 10 MM 7 8 in 22 m L10 65 30 ft 50 ft 9 m 15m L15 65 30 ft 50 ft 9 m 15m 651 3 8 in 10 MM 1 1 8 in 29 m Field Fabricated Field Fabricated TABLE 7 Late Models HS26 UNIT LIQUID LINE SUCTION LINE L10 LINE SET L15 LINE SET 018 3 8 in 10 mm 5 8 in 16 mm L10 26 20ft 50 ft 6m 15 m L15 26 20 ft 50 ft 6 m 15 m 024 030 036 3 8 in 10 mm 3 4 in 19 mm L...

Page 9: ...To Close Liquid Line Service Valve 1 Remove the stem cap with an adjustable wrench 2 Turn the stem in clockwise with a service wrench to front seat the valve Tighten firmly 3 Replace stem cap finger tighten then tighten an addi tional 1 6 turn 2 Suction Line Seating Type Service Valve A full service non backseating suction line service valve is used on all early HS26 series units except 461 Differ...

Page 10: ...PORT SERVICE PORT CAP STEM CAP INLET FROM INDOOR COIL OUTLET TO COMPRESSOR STEM USE ADJUSTABLE WRENCH ROTATE STEM CLOCKWISE 90_ TO CLOSE ROTATE STEM COUNTER CLOCKWISE 90_ TO OPEN BALL SHOWN OPEN C Service Valves Late Models The liquid line and suction line service valves and gauge ports are accessible by removing the compressor access cover Full service liquid and suction line valves are used See ...

Page 11: ...rating plate to list actual field charge TABLE 8 LIQUID LINE SET DIAMETER Ounce per 5 ft ml per mm adjust from 25 ft 7 6m line set 5 16 in 8mm 2 ounce per 5 ft 60 ml per 1524 mm 3 8 in 10 mm 3 ounce per 5 ft 90 ml per 1524 mm If line set is greater than 25 ft 7 6m add this amount If line set is less than 25 ft 7 6m subtract this amount Units are designed for line sets up to 50 ft 15m Consult Len n...

Page 12: ...tem 6 Reconnect vacuum pump to manifold center port hose Evacuate the system to an absolute pressure less than 197 inches of mercury 5 mm of mercury or 5000 microns then turn off vacuum pump If the abso lute pressure rises above 197 inches of mercury 5 mm of mercury or 5000 microns within a 20 minute period after stopping vacuum pump repeat step 6 If not evacuation is complete This evacuation proc...

Page 13: ... need for further servicing APPROACH METHOD TXV SYSTEMS Ambient Temperature of 60_F 16_C or Above 1 Connect gauge manifold Connect an upright HCFC 22 drum to center port of gauge manifold IMPORTANT The following procedure requires accurate read ings of ambient outdoor temperature liquid tem perature and liquid pressure for proper charging Use a thermometer with accuracy of 2 F and a pressure gauge...

Page 14: ...joints and coils for evidence of oil leaks IMPORTANT If insufficient heating or cooling occurs the unit should be gauged and refrigerant charge checked B Indoor Coil 1 Clean coil if necessary 2 Check connecting lines and coil for oil leaks 3 Check condensate line and clean if necessary C Indoor Unit 1 Clean or change filters 2 Adjust blower cooling speed Check static pressure drop over coil to det...

Page 15: ...minal Y Voltage from terminal Y passes through discharge temperature sensor compressor thermostat and low pressure switch to energize time delay terminal 2 3 Time delay action is at the beginning of a thermostat demand When energized time delay TD1 1 delays 8 5 seconds before en ergizing TD1 1 terminal 3 When TD1 1 ter minal 3 is energized the contactor coil is en ergized 4 When compressor contact...

Page 16: ...gh low pressure switch and the timed off control TOC which energizes K1 compressor contactor coil provided 5 minute delay is satisfied 2 K1 1 and K1 2 contacts close energizing B1 compressor and B4 outdoor fan 3 When cooling demand is satisfied K1 1 and K1 2 contacts open de energizing compressor and outdoor fan Timed off control begins 5 minute off time ...

Page 17: ...ough low pressure switch and the timed off control TOC which energizes K1 compressor contactor coil provided 5 minute delay is satisfied 2 K1 1 and K1 2 contacts close energizing B1 compressor and B4 outdoor fan 3 When cooling demand is satisfied K1 1 and K1 2 contacts open de energizing compressor and outdoor fan Timed off control begins 5 minute off time ...

Page 18: ...ied 2 K1 1 K1 2 and K1 3 contacts close energizing B1 compressor and B4 outdoor fan 3 When cooling demand is satisfied K1 1 K1 2 and K1 3 contacts open de energizing compressor and out door fan Timed off control begins 5 minute off time NOTE Three phase compressors must be phased correctly Compressor noise will be significantly higher if phasing is incorrect Compressor will operate backwards so un...

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