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Service Literature
The HP27 is a high efficiency residential split−system heat
pump which features a scroll compressor. It operates
much like a standard heat pump, but the scroll compressor
is unique in the way that it compresses refrigerant. 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.
This manual is divided into sections which discuss the ma-
jor components, refrigerant system and charging proce-
dures, maintenance and operation sequences. All specifi-
cations in this manual are subject to change.
Model No.
Net face area
Net face area
2
sq. ft. (m
)
Condenser
Tube diameter
Coil
Coil
No. of rows
Fins per inch (m)
Diameter in. (mm)
Motor hp (W)
Condenser
C d
Cfm (L/s)
Fan
Fan
Rpm
Watts
sRefrigerant furnished (HCFC-22)
Liquid line conn. o.d.
in. (mm) (sweat)
Vapor line conn. o.d.
in. (mm) (sweat)
Shipping wt.
lbs. (kg) 1 package
sRefrigerant charge sufficient for 15 ft. (4.5 m) length of refrigerant lines.
Model No.
Line voltage data
Rated load amps
Power factor
Compressor
p
Locked rotor amps
Full load amps
Outdoor Coil
Outdoor Coil
Fan Motor
Locked rotor amps
Rec. max. fuse or circuit breaker size (amps)
{Minimum circuit ampacity
{Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.
NOTE
Extremes of operating range are plus 10% and minus 5% of line voltage.
Corp. 9621−L10
Revised 08−2004
HP27 SERIES UNITS
SPECIFICATIONS
HP27−024
Outer Coil
21.77 (2.02)
Inner Coil
21.11 (1.96)
in. (mm)
5/16 (7.9)
22 (866)
No. of blades
24( 610) − 3
1/10 (75)
2800 (1320)
12 lbs. 5 oz. (5.6 kg)
3/8 (9.5)
3/4 (19)
268 (122)
ELECTRICAL DATA
HP27−024
10.26
0.96
13.8
HP27−030
21.77 (2.02)
21.11 (1.96)
5/16 (7.9)
2
2
22 (866)
24( 610) − 3
1/10 (75)
2800 (1320)
825
825
165
165
11 lbs. 5 oz. (5.1 kg)
3/8 (9.5)
3/4 (19)
271 (123)
HP27−030
208/230v 60hz−1ph
12.18
0.96
56
61
0.9
0.9
1.6
1.6
20
25
16.2
Page 1
HP27
HP27−036
HP27−042
24.06 (2.24)
24.06 (2.24)
23.33 (2.17)
23.33 (2.17)
5/16 (7.9)
5/16 (7.9)
2
22 (866)
22 (866)
24( 610) − 3
24( 610) − 3
1/10 (75)
1/10 (75)
2800 (1320)
2800 (1320)
825
170
11 lbs. 13 oz. (5.3 kg)
12 lbs. 12 oz. (5.8 kg)
3/8 (9.5)
3/8 (9.5)
7/8 (22.2)
7/8 (22.2)
328 (149)
328 (149)
HP27−036
HP27−042
13.46
0.96
73
0.9
1.6
30
17.8
© 1997 Lennox Industries Inc.
Litho U.S.A.
2
825
170
18.0
0.97
104
0.9
1.6
40
23.4
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Table of Contents
Related Manuals for Lennox HP27?024
Summary of Contents for Lennox HP27?024
- Page 1 23.4 {Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements. NOTE Extremes of operating range are plus 10% and minus 5% of line voltage. Page 1 © 1997 Lennox Industries Inc. Litho U.S.A.
-
Page 2: Scroll Compressor
DISCHARGE PRESSURE All major components (indoor blower/coils) must be FIGURE 3 matched according to Lennox recommendations for the compressor to be covered under warranty. Refer to the The counterclockwise orbiting scroll draws gas into the out- Engineering Handbook for approved system matchups. A... -
Page 3: Unit Components
HOW A SCROLL WORKS SUCTION SUCTION INTERMEDIATE PRESSURE MOVEMENT OF ORBIT CRESCENT SHAPED GAS POCKET ORBITING SCROLL SUCTION POCKET FLANKS SEALED BY STATIONARY SCROLL CENTRIFUGAL FORCE SUCTION SUCTION HIGH DISCHARGE PRESSURE POCKET FIGURE 4 III−UNIT COMPONENTS COMPRESSOR TERMINAL BOX A−Transformer The contactor, reversing valve, time delay, and defrost tim- er are all powered by 24VAC supplied by the indoor unit. - Page 4 HP27 UNIT COMPONENTS DEFROST CONTROL/TIMED−OFF CONTROL DUAL CAPACITOR CONTACTOR SENSING BULB −036, −042 ONLY GROUND LUG SENSING BULB −024, −030 ONLY TERMINAL STRIP HIGH PRESSURE THERMOMETER WELL SWITCH BIFLOW FILTER/DRIER SUCTION GAUGE PORT EXPANSION VALVE WITH INTERNAL CHECK VALVE VAPOR LINE SERVICE VALVE AND GAUGE PORT...
- Page 5 TABLE 3 H−Service Light Thermostat HP27 HP27−1 through −7 units are equipped with a service light HP27 DUAL CAPACITOR RATING thermostat (S54) located on the compressor discharge UNITS FAN MFD HERM MFD line. The switch is electrically connected to the service HP27−024 light in the indoor thermostat.
-
Page 6: Defrost Control Board
Defrost Control Timing Pins Time-Delay Each timing pin selection provides a different accumu- A 5-minute timed-off delay protects the compressor from lated compressor run period during one thermostat run short-cycling when there is an interruption in power to the cycle. This time period must occur before a defrost cycle unit or when a pressure switch resets. -
Page 7: Temperature Sensors
M−Defrost System HP27−4 and −6 ONLY Timed−Off Control The control board includes a 5−minute timed−off delay HP27−4 and −6 units are equipped with a demand defrost which protects the compressor from short cycling. The system. The self−calibrating defrost control board includes 5−minute delay is initiated at the end of a compressor defrost relays, sensors (two) which monitor coil and out- cycle, any time a system protection switch is reset, or if the... - Page 8 Normal Operation 3−Strike Lockout The demand defrost system control board includes a During normal operation, the control board continuously 3−strike lockout feature. This internal feature registers monitors the system operation mode (heating / cooling), protection circuit interruptions while Y1" (input) is ener- the outdoor ambient temperature, the outdoor coil temper- gized.
- Page 9 Diagnostic LEDs (Table 5) The defrost board includes two LEDs used for diagnostics. The LED flashes indicate a specific diagnostic code as detailed in the table below. TABLE 5 LED 1 LED 2 Condition Possible Cause(s) Solution No power (24V) to board terminals R & Check control transformer power (24V).
-
Page 10: Test Mode Operation
Test Mode Operation To Engage Test Mode − Place the temperature select shunt (jumper) across the test pins. Y1 Active Apply jumper to test pins for longer than Apply jumper to test pins for more than 0.5 seconds, but less than 2 seconds. 2 seconds. - Page 11 Time Delay N−Defrost System HP27−7 and later The timed−off delay is five minutes long. The delay helps The defrost system includes two components: protect the compressor from short−cycling in case the pow- a defrost thermostat er to the unit is interrupted or a pressure switch opens. The a defrost control delay is bypassed by placing the timer select jumper across the TEST pins for 0.5 seconds.
-
Page 12: Refrigerant System
7 or field fabricated refrigerant lines. Refer to the piping (9.1 m − 15.2 m) (4.5 m−15.2 m) section of the Lennox Unit Information Service Manual for proper size, type and application of field-fabricated lines. Separate discharge and suction service ports are pro-... - Page 13 HP27 COOLING CYCLE (WITH GAUGE MANIFOLD CONNECTIONS) OUTDOOR UNIT DEFROST NOTE − ARROWS INDICATE THERMOSTAT OUTDOOR COIL DIRECTION OF REFRIGERANT FLOW REVERSING EXPANSION/CHECK VALVE VALVE DISTRIBUTOR INDOOR UNIT BIFLOW FILTER/DRIER MUFFLER HIGH PRESSURE PRESSURE HIGH PRESSURE LIMIT VAPOR THERMOME- LINE VALVE WELL SUCTION...
- Page 14 B−Liquid and Vapor Line Service Valves To Access Schrader Port: 1 − Remove access panel. The liquid line and vapor line service valves and gauge 2 − Remove service port cap with an adjustable wrench. ports are accessible from outside of the unit. Full service liquid and vapor line valves are used.
- Page 15 1− Attach gauge manifold. Connect vacuum pump (with V−CHARGING vacuum gauge) to center port of gauge manifold. With Unit charge is based on a matching indoor coil and outdoor both manifold service valves open, start pump and evac- coil with a 15 foot (4.5m) line set. For varying lengths of line uate indoor coil and refrigerant lines.
- Page 16 1 − Expansion Valve Systems BLOCKING OUTDOOR COIL Block outdoor coil one side at a time The following procedures are intended as a general guide for with cardboard or plastic sheets until use with expansion valve systems only. For best results, in- proper testing pressures are reached.
-
Page 17: Maintenance
2 − Visually inspect all connecting lines, joints and coils over coil should be checked to determine correct for evidence of oil leaks. blower CFM. Refer to Lennox Engineering Hand- book. IMPORTANT 3 − Belt Drive Blowers - Check condition and tension. - Page 18 VII− WIRING DIAGRAM/OPERATING SEQUENCE A−Field Wiring, Thermostat Connections HP27 and TYPICAL BLOWER UNIT THERMOSTAT TERMINAL DESIGNATIONS Indoor HP27 Thermostat Blower Unit AMBIENT SENSOR SERVICE LIGHT REVERSING VALVE COMPRESSOR EMERGENCY HEAT COMMON COMMON 2ND STAGE AUX. HEAT POWER POWER 1ST STAGE AUX. HEAT DEFROST SENSING INDOOR BLOWER B−Field Wiring, Thermostat Connections...
- Page 19 C−Diagram HP27−1−208/230 Volt Page 19...
- Page 20 D−Diagram HP27−6−208/230 Volt Page 20...
- Page 21 E−Diagram HP27−7−208/230 Volt Page 21...
- Page 22 F−Diagram HP27−7−208/230 Volt Page 22...
- Page 23 Operating Sequence HP27 NOTE− Transformer in indoor unit supplies power DEFROST MODE (24VAC) to the thermostat and outdoor unit controls. 9− During heating operation when outdoor coil tempera- ture drops below 35_F (2_C) or 42_(5.5_C) see de- COOLING frost system description for specific unit dash number 1 −...