LM Series Heat Pump MODEL NOMENCLATURE LM 024 - 1 VT C - F L T - T A Size Revision Level A - Current Fan/Motor Options A - Constant Airflow ECM T - Constant Torque ECM Voltage Discharge Air Configuration...
4 | Standard package LM Series Heat Pump STANDARD PACKAGE LM Series Water-to-Air Heat Pumps are available in Vertical (VT) and Horizontal (HZ) configurations. VT and HZ units Discharge Air Orientation is Field Configurable with the purchase of a separate kit.
LM Series Heat Pump Moving and Storage | 5 For storage If unit stacking is required, stack units as follows: Do not stack 6 ton units! Vertical units: less than 6 tons, no more than two high. Horizontals units: less than 6 tons, no more than three high.
6 | Return and Discharge Duct Flanges LM Series Heat Pump RETURN AND DISCHARGE DUCT FLANGES Return and discharge opening duct flanges are shipped unfolded. Flanges bend lines are perforated allowing easy bending using standard sheet metal pliers or channel locks. (Figure #3)
LM Series Heat Pump Condensate Drain | 7 If the unit is located in a crawl space, the bottom A flexible connector is recommended for supply of the unit must be at least 4” above grade to and return air duct connections on metal duct prevent flooding of the electrical parts during systems.
8 | Piping LM Series Heat Pump PIPING ELECTRICAL Supply and return piping must be as large as the Refer to electrical component box layout. unit connections on the heat pump (larger on long (Figures #6-8) runs). Field wiring must comply with local and Never use flexible hoses of a smaller inside national electric codes.
Page 9
LM Series Heat Pump Electrical | 9 Figure # 6 - Single Phase Unit Figure # 8 Three Phase Unit [1] Compressor contactor [2] Emergency Relay (Option) [3] Second Stage Relay [4] Hot Gas Reheat Relay (Option) [5] Cooling Relay...
10 | Electrical LM Series Heat Pump Safety Devices and the UPM Controller If the thermostat is provided with a malfunction light powered off of the hot (R) side of the transformer, then the thermostat malfunction light connection should be connected directly to the (ALR) contact on the unit’s UPM board.
Page 11
LM Series Heat Pump Electrical | 11 • Evaporator freeze protection sensor, mounted between the thermal expansion device and the UPM Board Factory Default Settings evaporator, monitors refrigerant temperature TEMP 30°F between the evaporator coil and thermal expansion valve. If temperature drops below or...
Page 12
12 | Electrical LM Series Heat Pump • MALFUNCTION OUTPUT: between the thermal expansion valve and Alarm output is If pulse is water coil. If temperature drops below or Normally Open (NO) dry contact. selected the alarm output will be pulsed. The...
LM Series Heat Pump Electrical | 13 ECM INTERFACE BOARD- Constant Airflow Motor (Option) Thermostat Outputs Refer to Figure #9, item [12] for ECM interface First Stage Compressor Operation board location. In addition to providing a connecting point for thermostat wiring, the...
14 | Constant Torque Motors (ECM) LM Series Heat Pump To the left of the red and green status LED’s is a row of 1/4” male quick connects. These are used Do not set the ADJ DIP switch to the (-) to pass thermostat inputs on to the rest of the setting when electric heaters are installed.
Number of factory installed options are available on LM Series of Heat Pumps. The following details the purpose, function and components of each Heat pumps with hot Gas Reheat need to be option.
(Y2) the second stage (or full compressor The DPS water flow proving switch is a factory capacity) is initiated. The fan ramps up to full installed option available for the LM series. The cooling air flow. DPS prevents compressor operation if there is...
Page 17
LM Series Heat Pump Sequence of Operation | 17 UPM Sequence of Operation (SOO) Flow Chart Y1=1 Power/Switchs/Sensor Status Check 18VAC > Lockout Can Be Set To 4 Via Dip Switch Blink Code On Status LED Soft Lockout HPC = 1...
18 | Application Considerations LM Series Heat Pump APPLICATION CONSIDERATIONS No unit should be connected to the supply or return piping until the water system has been Cooling Tower/Boiler Systems completely cleaned and flushed to remove any dirt, piping chips or other foreign material. Supply and...
Page 19
LM Series Heat Pump Application Considerations | 19 Note: Diagram shows typical installation and is for illustration purposes only. Ensure access to Heat Pump is not restricted. Figure # 15 [1] Line voltage disconnect (unit) [2] Low voltage control connection...
20 | Application Considerations LM Series Heat Pump Geothermal Systems installation easy. Anti-freeze solutions are utilized when low evaporating conditions are expected to Closed loop and pond applications require occur. Refer to the GLP installation manuals for specialized design knowledge. No attempt at these more specific instructions.
LM Series Heat Pump System Checkout | 21 SYSTEM CHECKOUT 2. Set the thermostat to the highest setting. 3. Set the thermostat system switch to “COOL”, After completing the installation, and before and the fan switch to the “AUTO” position. The energizing the unit, the following system checks reversing valve solenoid should energize.
22 | Maintenance LM Series Heat Pump 3. Lubrication of the blower motor is not required, however may be performed on some motors to extend motor life. Use SAE-20 non- detergent electric motor oil. 4. The condensate drain should be checked annually by cleaning and flushing to insure proper drainage.
LM Series Heat Pump Unit Check-Out Sheet | 23 UNIT CHECK-OUT SHEET Customer Data Customer Name _____________________________________________ Date ___________________________________ Address ______________________________________________________ _______________________________________________________________ Phone _______________________________________________________ Unit Number ___________________________ Unit Nameplate Data Unit Make _________________________________________ Model Number ____________________________________ Serial Number ____________________________________ Refrigerant Charge (oz) __________________________...
24 | Troubleshooting LM Series Heat Pump TROUBLESHOOTING Troubleshooting Information Solution LM Series Water Source Heat Pump is equipped column may reflect a possible fault that with two (2) externally mounted LEDs (Figure #21) may be one of, or a combination of that blink for unit errors.
Page 25
LM Series Heat Pump Troubleshooting | 25 Unit Troubleshooting Problem Possible Cause Checks and Correction UNIT OFF ON Discharge In “COOLING” mode: Lack of or inadequate water flow. Entering water HIGH PRESSURE pressure too high temperature is too warm. Scaled or plugged condenser. In “HEATING”...
Page 27
LM Series Heat Pump Troubleshooting | 27 UPM Board LED Indications Indication Color Blinks Description GREEN Solid 18-30 VAC Power is present High pressure lockout Low pressure lockout Freeze sensor lockout Condensate overflow Brownout Evaporator Freeze condition Comfort Alert Module -Flash Codes...
Page 28
28 | Troubleshooting LM Series Heat Pump Comfort Alert Module -Flash Codes Status LED Status LED Description Status LED Troubleshooting Information Solution YELLOW "ALERT” Open Circuit 1. Outdoor unit power disconnect is open FLASH CODE 5 2. Compressor circuit breaker or fuse(s) is open 3.
LM Series Heat Pump Electronic Thermostat Installation | 29 ELECTRONIC THERMOSTAT INSTALLATION Packaged heat pumps are equipped with detachable Thermostat connectors. These Position the thermostat subbase against the wall so that it is level and the thermostat wires connectors are located in different locations protrude through the middle of the subbase.
30 | Operating Temperatures and Pressures LM Series Heat Pump OPERATING TEMPERATURES AND PRESSURES Operating Temperatures and Pressures COOLING HEATING Entering Suction Discharge Water Suction Discharge Water Model Water Pressure Pressure Temp Temp Pressure Pressure Temp Temp Temp. F Flow...
LM Series Heat Pump Airflow Tables | 35 AIRFLOW TABLES Constant Torque Motor Airflow Table (LM0**-***-***-T*) ECM Const Torque Motor - X13 Rated Factory External Static Pressure (in of Water) Models Speed Airflow setting 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 1.10 1.20...
Page 36
36 | Airflow Tables LM Series Heat Pump Constant Airflow Motor Airflow Table (LM0**-***-***-A* ECM Const CFM Motor - EON Rated External Static Pressure (in of Water) Models Speed Airflow Adjust Tap 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00...
Page 37
LM Series Heat Pump Airflow Tables | 37 Figure 24: Water side pressure drop in PSIG Water PD @ 77°EWT Series with Water LM024 LM036 10.5 LM048 12.5 LM060 17.5 LM070 Revised 09-13 8 733 905 315 (2013/9)