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Service Literature
The 12HPB is a residential split-system heat pump. The
series is designed for use with expansion valves (TXV). All
12HPB units utilize scroll compressors.
Information contained in this manual is intended for use by
qualified service technicians only. All specifications are subject
to change.
This manual is divided into sections which discuss the
major components, refrigerant system, charging proce-
dure, maintenance and operation sequence.
12HPB series units are available in 2, 2 -1/2, 3, 3 -1/2, 4
and 5 ton capacities. All major components (indoor blower
and coil) must be matched according to Lennox recom-
mendations for the compressor to be covered under war-
ranty. Refer to the Engineering Handbook for approved
system matchups.
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
CAUTION
Electrostatic discharge can affect electronic
components. Take precautions during unit instal-
lation and service to protect the unit's electronic
controls. Precautions will help to avoid control
exposure to electrostatic discharge by putting
the unit, the control and the technician at the
same electrostatic potential. Neutralize electro-
static charge by touching hand and all tools on an
unpainted unit surface before performing any
service procedure.
Model No.
Net face area - sq. ft. (m
Net face area sq ft (m
Outdoor
Outdoor
Coil
Tube diameter
Fins per inch (m)
Diameter
in. (mm) & no. of blades
Motor hp (W)
Outdoor
Outdoor
Cfm (L/s)
Coil
F
Fan
Rpm
Watts
*Refrigerant charge furnished (HCFC-22)
Liquid line
in. (mm) o.d. connection (sweat)
Vapor line
in. (mm) o.d. connection (sweat)
Shipping weight
lbs. (kg) 1 package
*Refrigerant charge sufficient for 15 ft. (4.5 m) length of refrigerant lines.
Corp.9504-L1
Revised 10-2004
12HPB SERIES UNITS
SPECIFICATIONS
Outer coil
2
2
)
)
Inner coil
in. (mm) & no. of rows
Refrigerant can be harmful if it is inhaled. Refriger-
ant must be used and recovered responsibly.
Failure to follow this warning may result in person-
al injury or death.
12HPB24
15.21 (1.41)
5.44 (0.51)
5/16 (8)
1.37
18 (709)
18 (457)
3
1/6 (124)
2500 (1180)
1100
200
6 lbs. 14 oz. (3.11 kg)
3/8 (9.5)
3/4 (19.1)
162 (73)
Page 1
12HPB
WARNING
12HPB30
12HPB36
15.21 (1.41)
15.21 (1.41)
14.50 (1.35)
14.50 (1.35)
5/16 (8)
2
5/16 (8)
22 (866)
18 (457)
4
18 (457)
1/6 (124)
2450 (1155)
2450 (1155)
1100
200
7 lbs. 14 oz. (3.56 kg)
8 lbs. 1 oz. (3.64 kg)
3/8 (9.5)
3/4 (19.1)
7/8 (22.2)
181 (82)
©1997 Lennox Industries Inc.
2
22 (866)
4
1/6 (124)
1100
200
3/8 (9.5)
187 (85)
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Related Manuals for Lennox 12HPB Series
Summary of Contents for Lennox 12HPB Series
- Page 1 12HPB series units are available in 2, 2 -1/2, 3, 3 -1/2, 4 and 5 ton capacities. All major components (indoor blower and coil) must be matched according to Lennox recom- mendations for the compressor to be covered under war- ranty.
- Page 2 SPECIFICATIONS (continued) Model No. 12HPB42 12HPB48 12HPB60 Outer coil 15.21 (1.41) 21.11 (1.96) 21.11 (1.96) Net face area sq ft (m Net face area - sq. ft. (m Inner coil 14.50 (1.35) 20.31 (1.89) 20.31 (1.89) Outdoor Outdoor Coil Tube diameter in.
-
Page 3: Table 1
The compressor is energized by a contactor located in the SUCTION MUFFLER control box. See figure 2. Single−pole and two-pole con- tactors are used in 12HPB series units. See wiring dia- DEFROST grams for specific unit. K1 is energized through the con- THERMOSTAT trol board by the indoor thermostat terminal Y1 (24V) when thermostat demand is present. -
Page 4: Defrost Control Board Diagnostic Led Mode Led
− Defrost Control open pressure switch occurrence. See table 2. The unit will re- The defrost control board in the 12HPB series units has the main locked out until 24 volt power is broken to terminal R" on combined functions of a time/temperature defrost control, de- the defrost board and then remade. - Page 5 12HPB DEFROST CONTROL BOARD NOTE − COMPONENT LOCATIONS WILL VARY WITH BOARD MANUFACTURER PRESSURE SWITCH SAFETY CIRCUIT CONNECTION FOR CONNECTIONS ONE OPTIONAL SWITCH High Pressure Switch DEFROST INTERVAL TIMING PINS CONNECTIONS FOR TWO OPTIONAL SWITCHES AMBIENT THERMISTOR CONNECTION SERVICE LIGHT Optional CONNECTION switch...
-
Page 6: Table Of Contents
Defrost Control Timing Pins B − Compressor All 12HPB units utilize a scroll compressor. The scroll com- Each timing pin selection provides a different accumu- pressor design is simple, efficient and requires few moving lated compressor run time period during one thermostat parts. -
Page 7: Figure 9
2 for compressor specifications. rate from the stationary scroll. The liquid is worked toward the center of the scroll and is discharged. If the compressor is re- placed, conventional Lennox cleanup practices must be used. SUCTION SUCTION... -
Page 8: Figure 10
C − Outdoor Fan Motor CONDENSER FAN MOTOR All units use single−phase PSC fan motors which require a run AND COMPRESSOR ACCESS capacitor. In all units, the condenser fan is controlled by the compressor contactor. FAN GUARD ELECTRICAL DATA tables in this manual show specifi- Remove (7) screws cations for condenser fans used in 12HPBs. - Page 9 12HPB COOLING CYCLE (SHOWING MANIFOLD GAUGE CONNECTIONS) OUTDOOR UNIT DEFROST THERMOSTAT DISTRIBUTOR REVERSING VALVE EXPANSION/CHECK VALVE BIFLOW OUTDOOR FILTER / DRIER COIL HIGH INDOOR UNIT PRESSURE PRESSURE MUFFLER GAUGE MANIFOLD SUCTION SERVICE VAPOR PORT LINE LIQUID LINE VALVE R−22 SERVICE COMPRESSOR DRUM PORT...
- Page 10 Field refrigerant piping consists of liquid and vapor lines Do not attempt to backseat this valve. Attempts to from the outdoor unit (sweat connections). Use Lennox backseat this valve will cause snap ring to explode L10 (flare) or L15 (sweat) series line sets as shown in from valve body under pressure of refrigerant.
- Page 11 (U−tube), or thermocouple gauge should be used. Units are designed for line sets up to 50 feet (15.2 m). The usual Bourdon tube gauges are not accurate Consult Lennox Refrigerant Piping Manual for line sets enough in the vacuum range. over 50 feet (15.2 m).
- Page 12 IMPORTANT IMPORTANT The compressor should never be used to evacu- The following procedures require accurate ate a refrigeration or air conditioning system. readings of ambient (outdoor) temperature, liquid temperature and liquid pressure for proper charging. Use a thermometer with accuracy of +2°F( + 1.1°C) and a pressure gauge with accuracy 2−...
- Page 13 TABLE 7 12HPB24 12HPB30 12HPB36 12HPB42 12HPB48 12HPB60 Outdoor Coil Outdoor Coil Air Entering liq. vap. liq. vap. liq. vap. liq. vap. liq. vap. liq. vap. Temp. _F (_C) PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG 65 (183.) 75 (23.9)
- Page 14 LOW VOLTAGE FIELD WIRING FOR 12HPB SERIES UNITS WITH CB19/CBH19/ECB19, CB29M/ CB30M/ ECB29 COIL & TYPICAL ROOM THERMOSTAT "T" & "L" connections used only if field provided & installed ambient Common terminal "C" compensating thermistor & service or "X" used only on light thermostat are installed in the some thermostats.
- Page 15 V − WIRING DIAGRAM AND SEQUENCE OF OPERATION 12HPB 2 THROUGH 5 TON UNIT WIRING Page 15...
- Page 16 12HPB 2 THROUGH 5 TON UNIT WIRING Page 16...
- Page 17 12HPB 2 THROUGH 5 TON UNIT WIRING Page 17...
- Page 18 12HPB 1-1/2 THROUGH 5 TON OPERATING SEQUENCE This is the sequence of operation for 12HPB series units. END OF FIRST STAGE HEAT: The sequence is outlined by numbered steps which corre- 13 − Heating demand is satisfied. Terminal Y1 is de- spond to circled numbers on the adjacent diagram.