Lennox HP21 Series Installation Instructions Manual
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Lennox HP21 Series Installation Instructions Manual

Lennox HP21 Series Installation Instructions Manual

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E 2001 Lennox Industries Inc.
Dallas, Texas, USA

HP21 Outdoor Unit

Lennox HP21 two−speed outdoor units are approved and
warranted only for installation with specially matched indoor
coils, line sets and thermal expansion valves (TXV) as des-
ignated by Lennox. Refer to the Lennox Engineering Hand-
book for approved systems.

Shipping and Packing List

1 − Assembled HP21 outdoor unit unit
Check equipment for shipping damage. If you find any
damage, immediately contact the last carrier.

General Information

These instructions are intended as a general guide and do
not supersede national or local codes in any way. Consult
authorities having jurisdiction before installation. Only quali-
fied technicians should install and service the unit.
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person-
al injury or loss of life. Installation and service must
be performed by a qualified installer or service
agency.
IMPORTANT
The Clean Air Act of 1990 bans the intentional vent-
ing of refrigerant (CFC's and HCFC's) as of July 1,
1992. Approved methods of recovery, recycling or
reclaiming must be followed. Fines and/or incarcera-
tion may be levied for noncompliance.
02/04
*2P0204*
INSTALLATION
INSTRUCTIONS
HP21 SERIES UNITS
HEAT PUMP UNITS
504,437M
02/04
Supersedes 12/02

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RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
This product and/or the indoor unit it is matched with
may contain fiberglass wool
Disturbing the insulation during installation, mainte-
nance, or repair will expose you to fiberglass wool
dust. Breathing this may cause lung cancer. (Fiber-
glass wool is known to the State of California to
cause cancer.)
Fiberglass wool may also cause respiratory, skin,
and eye irritation.
To reduce exposure to this substance or for further
information, consult material safety data sheets
available from address shown below, or contact your
supervisor.
Lennox Industries Inc.
P.O. Box 799900
Dallas, TX 75379−9900
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WARNING
504,437M
*P504437M*
Litho U.S.A.
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Summary of Contents for Lennox HP21 Series

  • Page 1: Table Of Contents

    Two−Speed Control (TSC6) ..... ignated by Lennox. Refer to the Lennox Engineering Hand- System Operation ......

  • Page 2: Unit Dimensions

    Unit Dimensions − inches (mm) INLET AIR INLET Model Model HP21-36 34-7/8 16-3/4 HP21-48 40-7/8 1038 19-3/4 COMPRESSOR HP21-60 44-7/8 1140 19-3/4 COIL DRAIN INLET AIR OUTLETS TOP VIEW (Around perimeter of base) 34-1/16 32-1/8 (865) (816) ELECTRICAL INLETS DISCHARGE VAPOR LINE INLET 2-7/8...

  • Page 3: Parts Arrangement

    Parts Arrangement HP21 Parts Arrangement OUTDOOR UNIT CONTROL TRANSFORMER FILTER/DRIER VAPOR LINE SERVICE VALVE MUFFLER LIQUID LINE REVERSING SERVICE VALVE VALVE COMPRESSOR TERMINAL BOX HIGH PRESSURE COMPRESSOR SWITCH DISCHARGE LINE Figure 1 Setting the Unit Installation Clearances CAUTION *36" (914 mm) NOTE −...

  • Page 4: Electrical

    1 − Place a sound−absorbing material, such as Isomode, Rooftop Application under the unit if you plan to install it in a location or posi- Wind Barrier Construction PREVAILING WINTER WINDS tion that will transmit sound or vibration to the living area or adjacent buildings.
  • Page 5 HP21 Single Phase Typical Wiring Field Wiring Diagram Figure 5 HP21 Three Phase Typical Wiring Field Wiring Diagram Figure 6 Page 5...
  • Page 6 FIELD WIRING DIAGRAM HP21 WITH CB 24VAC 18GA. MIN. FIELD INSTALLED JUMPERS REQUIRED FOR TERMINAL STRIP TB1 Humidity Outdoor Unit Jumpers Control Required With CCB1 Single-Speed Outdoor Unit Y1 to Y2 Humidity Two-Speed Outdoor Unit none Control Without CCB1 Single-Speed Outdoor Unit DS to Y1 Humidity Two-Speed Outdoor Unit...

  • Page 7: Refrigerant Piping

    (sweat connections) to the indoor During the installation of any heat pump or a/c system, it is evaporator coil (typically flare connections). Use Lennox important to properly isolate the refrigerant lines to prevent L15 line sets as shown in table 1 or use field−fabricated re- unnecessary vibration.
  • Page 8 Refrigerant Line Sets How To Install Vertical Runs (new construction shown) NOTE - Similar installation practices should be used if line set is to be installed on exterior of outside wall. IMPORTANT - Refrigerant Outside Wall Vapor Line Liquid Line lines must not contact wall.
  • Page 9 Refrigerant Line Sets: Installing Horizontal Runs To hang line set from joist or rafter, use either metal strapping material Wire Tie or anchored heavy nylon wire ties. (around vapor line only) 8 feet Floor Joist or Roof Rafter Tape or Wire Tie 8 feet Strapping Material (around vapor line only) Metal Sleeve...
  • Page 10 Refrigerant Line Sets: Transition From Vertical To Horizontal Automotive Anchored Heavy Muffler-Type Nylon Wire Tie Hanger Wall Wall Stud Stud Strap Liquid Line Strap Liquid Line To Vapor Line To Vapor Line Liquid Line Vapor Line Metal Vapor Line Wrapped in Metal Sleeve Liquid Line...

  • Page 11: Refrigerant Metering Device

    Refrigerant Metering Device These units are used in check expansion valve systems Manifold Gauge Set only. See the Lennox Engineering Handbook for approved Use a manifold gauge set equipped with low loss" hoses TXV match-ups and application information. when checking the charge of the unit. Do not use A man- Check expansion valves equipped with Chatleff fittings ifold gauge set with anything other than low loss"...

  • Page 12: Service Valves

    HP21 Cooling Cycle (Shows Gauge Manifold Connections) HIGH REVERSING CHARGE PRESSURE PRESSURE VALVE COMPENSATOR ACCUMULATOR HIGH PRESSURE SWITCH DISCHARGE MUFFLER PRESSURE VAPOR LINE CONNECTION VALVE HEATING CYCLE PRESSURE CONNECTION COOLING LIQUID LINE COMPRESSOR CYCLE VALVE CHECK AND CHECK AND FILTER/DRIER EXPANSION EXPANSION (BI−FLOW)

  • Page 13: Leak Testing

    Closing the Liquid or Vapor Line Service Valve: WARNING 1 − Remove the stem cap with an adjustable wrench. 2 − Use a service wrench with a hex head extension to turn Danger of fire. Bleeding the refrigerant the stem clockwise to seat the valve. Tighten firmly. charge from only the high side may NOTE −...

  • Page 14: Evacuation

    3 − Open the high pressure side of the manifold to allow NOTE − The term absolute pressure means the total actual pressure within a given volume or system, the R22 into the line set and indoor unit. Weigh in a above the absolute zero of pressure.

  • Page 15: Charging

    3 − After evacuation is complete, open the liquid line and Weighing in the Charge Fixed Orifice or vapor line service valves (counterclockwise) to release TXV Systems – Outdoor Temp. < 65_F (18_C) refrigerant charge (contained in outdoor unit) into the If the system is void of refrigerant, or if the outdoor ambient system.

  • Page 16: Two−Speed Control (Tsc6)

    Table 5 sor based on demands from the indoor thermostat. See fig- ure 15 for TSC6 control component identification. The con- Normal Operating Pressures trol features diagnostic lights and the capability of storing Out. Coil −36 −48 −60 diagnostic codes. Mode Entering Entering...
  • Page 17 TSC6 Two-speed Control Components Option 1 Enable Diagnostic LEDs OPtion 2 Enable Jumper D8, D4, D2, D1 Mode Selection Jumper (see table 6 for diagnostic codes) Jumpers Heartbeat Manual Override Button Compressor Sensor Connectors Y1 LED Low Speed Lockout Y2 LED Temperature Adjust Outdoor Temp.
  • Page 18 Options 1 and 2 Jumper Selections will operate the compressor in low speed for ten seconds, turn off for ten seconds, then operate in high speed for ten These two jumper settings are used with optional safety seconds. If the test detects a problem condition, the code is devices (with a normally closed switch) such as a low displayed.

  • Page 19: System Operation

    Table 6 Code 7 − Hot Compressor > Five Minutes Code 7 indicates the compressor temperature exceeded TSC6 Diagnostics Codes its limit after running more than five minutes. Code 7 is Display Lights stored. Code # Code # Condition Condition Code 8 −...

  • Page 20: Defrost System

    High Pressure Switch Emergency heat is usually used during a outdoor unit shutdown. It should also be used following a power HP21 units are equipped with a high pressure switch that is located in the discharge line of the compressor. The switch outage if power has been off for over an hour and the (SPST, manual reset, which is normally closed) removes outdoor temperature is below 50°F (10°C).

  • Page 21: Maintenance

    Test Mode DEFROST CONTROL When Y1 is energized and 24V power is being applied to the board, a test cycle (approximately 12 seconds) can be TEST initiated by placing the termination temperature jumper PINS Yout across the Test" pins. If the jumper is applied to the test pins before power is applied, or if the jumper is left across the Test"...

  • Page 22: Optional Accessories

    Indoor Unit Optional Accessories 1 − Clean or change filters. Refer to the Engineering Handbook for optional accesso- 2 − Adjust blower speed for cooling. Measure the pressure ries that may apply to this unit. The following may or may drop over the coil to determine the correct blower CFM.

This manual is also suitable for:

Hp21-36Hp21-48Hp21-60

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