INSTALLATION AND MAINTENANCE INSTRUCTIONS 4HP18LT Series Split System Heat Pump Save these instructions for future reference WARNING The equipment covered in this manual is to be installed by trained and experienced service and installation technicians. Improper installation, modification, service, or use can cause electrical shock, fire, explosion, or other conditions which may cause personal injury, death, or property damage.
INSTALLATION General Read this entire instruction manual, as well as the instructions supplied in separate equipment, before starting the installation. Observe and follow all warnings, cautions, instructional labels, and tags. Failure to comply with these instructions could result in an unsafe condition and/or premature component failure. These instructions are intended as a general guide only for use by qualified personnel and do not supersede any national or local codes in any way.
• Install the unit high enough above the ground or roof to allow adequate drainage of defrost water and prevent ice buildup. • In heavy snow areas, do not locate the unit where drifting snow will occur. The unit base should be elevated above the depth of average snows. If unit coil cannot be mounted away from prevailing winter winds, a wind barrier should be constructed (See Figure 3). Size the barrier at least the same height and width as the outdoor unit.
Refrigerant Piping If the 4HP18LT unit is being installed with a new indoor coil and line set, the refrigerant connections should be made as outlined in this section. If an existing line set and/or indoor coil will be used to complete the system, refer to this section as well as the section that follows entitled - Flushing Existing Line Set and Indoor Coil.
Placement Be aware that some localities are adopting sound ordinances based on how noisy the unit is at the neighbor’s home, not at the original installation. Install the unit as far as possible from the property line. When possible, do not install the unit directly outside a bedroom window. Glass has a verry high level of sound transmission. Figure 5 shows how to place the outdoor unit and line set to reduce line set vibration. Brazing Connection Procedure 1.
. Braze the line set to the service valve. Quench the joints with water or a wet cloth to prevent heat damage to the valve core and opening port. The tube end must stay bottomed in the fitting during final assembly to ensure proper seating, sealing, and rigidity. 7. Install the thermal expansion valve which is sold separately and which is approved for use with R410A refrigerant in the liquid line at the indoor coil (see Refrigerant Metering Device on page 9).
Refrigerant Line Sets: Transition from Vertical to Horizontal Automotive Muffler-Type Hanger Anchored Heavy Nylon Wire Tie Strap Liquid Line to Vapor Line Wall Stud Strap Liquid Line to Vapor Line Wall Stud Liquid Line Metal Sleeve Liquid Line Vapor Line – Wrapped in Armaflex Metal Sleeve Vapor Line – Wrapped in Armaflex Figure 7 Refrigeraant Line Sets: Installing Vertical Runs (new construction shown) IMPORTANT: Refrigerant lines must not contact wall.
Flushing Existing Line Set and Indoor Coil This procedure should not be performed on systems which contain contaminants, such as compressor burn out. Required Euipment The following equipment is needed to flush the existing line set and indoor coil (See Figure 9). Two clean R-22 recovery bottles, an oil-less recovery machine with a “pump down” feature, and two sets of gauges (one for use with R-22 and one for use with R410A). from the existing system.
4. Remover the existing R-22 refrigerant flow control orifice or thermal expansion valve before continuing with flushing procedures. R-22 flow control devices are not approved for use with R410A refrigerant and may prevent proper flushing. Use a field-provided fitting to reconnect the lines. An R410A system will not operate properly with an R-22 metering device. Install the refrigerant metering device as shown in Figure 11. Do not twist cap tubes when loosening the seal nut from the orifice housing.
3. Connect the external equalizer line to the equalizer port on the suction line and tighten to 8 ft.lbs. 4. Strap the superheat sensing bulb to the suction header. If installing an expansion valve on an indoor coil that previously used a fixed orifice, be sure to remove the existing fixed orifice. Failure to remove a fixed orifice when installing an expansion valve to the indoor coil will result in improper operation and damage to the system.
3. Open the high pressure side of the manifold to allow R410A into the line set and indoor unit. Weigh in a trace amount of R410A. (A trace amount is a maximum of 2 oz. of refrigerant or 3 lbs. pressure.) Close the valve on the R410A cylinder and the valve on the high pressure side of the manifold gauge set. Disconnect the R410A cylinder. 4. Connect a cylinder of nitrogen with a pressure regulating valve to the center port of the manifold gauge set.
4. Open both manifold valves and start vacuum pump. 5. Evacuate the line set and indoor unit to a minimum of 500 microns or lower. During the early stages of evacuation, it is desirable to close the manifold gauge valve at least once to determine if there is a rapid rise in pressure. A rapid rise in pressure indicates a relatively large leak. If this occurs, the leak testing procedure must be repeated. 6.
Units are factory charged with the amount of R410A refrigerant indicated on the unit rating plate. This charge is based on a matching indoor coil and outdoor coil with 15’ line set. For varying lengths of line set, refer to Table 4 for refrigerant charge adjustment. A blank space is provided on the unit rating plate to list the actual field charge.
Figure 13 1. Connect the manifold gauge set to the service valve ports as follows (See Figure 13 above): 2. Conduct a leak check, then evacuate as previously outlined. 3. Weigh in the charge according to the total amount shown on the unit nameplate. • Low pressure gauge to suction line service valve • High pressure gauge to liquid line service valve 2. Close manifold gauge set valves. Connect the center manifold hose to an upright cylinder of R410A. 3.
R410A Temperature/Pressure Chart Temp. (F P re s s u re P s ig Temp. (F P re s s u re P s ig Temp. (F P re s s u re P s ig 32 1 0 0 .8 74 2 1 4 .0 116 3 9 6 .0 33 1 0 2 .9 75 2 1 7 .4 117 4 0 1 .3 34 1 0 5 .0 76 2 2 0 .9 118 4 0 6 .7 35 1 0 7 .1 77 2 2 4 .4 119 4 1 2 .2 36 1 0 9 .2 78 2 2 8 .0 120 4 1 7 .7 37 1 1 1 .4 79 2 3 1 .6 121 4 2 3 .2 38 1 1 3 .6 80 2 3 5 .3 122 4 2 8 .8 39 1 1 5 .8 81 2 3 9 .0 123 4 3 4 .5 40 1 1 8 .0 82 2 4 2 .
_ = ° Liquid Line Temperature °F ° Outdoor Ambient Temperature °F ° Approach Temperature °F 6. Compare the approach value with those shown in Table 9. If the values do not agree with those provided in Table 8, add refrigerant to lower the approach temperature or recover refrigerant from the system to increase the approach temperature. Check Charge Using Normal Operating Pressures Use Table 7 to perform maintenance checks. Table 7 is not a procedure for charging the system.
L - Liquid S- Suction Values provided above are typical pressures. Indoor unit matchup, indoor air quality equipment, and indoor load will case pressures to vary.
Emergency heat is usually used during an outdoor shutdown, but it should also be used following a power outage if power has been off for over an hour and the outdoor temperature is below 50°F. System should be left in the emergency heat mode at least 6 hours to allow the crankcase heater sufficient time to prevent compressor slugging. OPERATION Outdoor unit and indoor blower cycle on demand from the room thermostat.
Defrost Control Timing Pins Each timing pin selection provides a different accumulated compressor run time period during one thermostat run cycle. This time period must occur before a defrost cycle is initiated. The defrost interval can be adjusted to 30 (T1), 60 (T2), or 90 (T3) minutes. The defrost timing jumper is factory installed to provide a 60 minute defrost interval. If the timing selector jumper is not in place, the control defaults to a 90 minute defrost interval.
System Diagnostic Module 4HP18LT units contain a diagnostic module for troubleshouting heat pump system failures. By monitoring and analyzing data from the compressor and thermostat demand, the module can accurately detect the cause of electrical and system related failure without any sensors. If a system problem occurs, a flashing LED indicator communicates the failure code. LED Description POWER LED (Green) indicates voltage is present at the power connection of the module.
Every time the module powers up, the last ALERT LED flash code that occurred prior to shutdown is displayed for 60 seconds. The module will continue to display the previous flash code until the condition returns to normal or 21VAC is removed from the module. TRIP and ALERT LEDs flashing at the same time means control circuit voltage is too low for operation. 24VAC Power Wiring The diagnostic module requires a constant nominal 24VAC power supply.
Thermostat Demand Wiring The diagnostic module requires a thermostat demand signal to operate properly. The thermostat demand signal input, labeled Y on the module, should always be connected to the compressor contactor coil so that when the coil is energized, the demand signal input is 24VAC. When the coil is not energized, the demand signal input should be less than 0.5VAC. Miswired Module Codes Depending on the system configuration, some ALERT flash codes may not be active.
MAINTENANCE WARNING Before performing maintenance operations on system, turn the electric power to unit OFF at disconnect switch(es). Unit may have multiple power supplies. Electrical shock could cause personal injury or death. Before the start of each heating and cooling season, the following service checks should be performed by a qualified service technician. Inspect and clean outdoor and indoor coils. The outdoor coil may be flushed with a water hose.
HOMEOWNER INFORMATION In order to ensure peak performance, your system must be properly maintained. Clogged filters and blocked airflow prevent your unit from operating at its most efficient level. more frequently if it is exposed to substances which are corrosive or which block airflow across the coil (such as pet urine, cottonwood seeds, etc...).
Fan Switch In AUTO or INT (intermittent) mode, the blower operates only when the thermostat calls for heating or cooling. This mode is generally preferred when humidity control is a priority. The ON or CONT mode provides continuous indoor blower operation, regardless of whether the compressor or auxiliary heat are operating. This mode is required when constant air circulation or filtering is desired.
Start-Up and Performance Checklist Job Name _____________________________ Job No. ____________ Date ___________ Job Location ___________________________ City _______________ State ___________ Installer _______________________________ City _______________ State ___________ Unit Model No. _________________________ Serial No.
Wire Diagram OUTDOOR FAN LT BLUE RED BLUE YELLOW BLACK GREEN DUAL CAPACITOR F RED C H THERMOSTAT C FAN RED O-OUT W1 O Y1 Y2 RED Y2 L R O Y1 OUT Y1 R O Y1 C SOLE BLACK C C 24V L DF BLUE W1 L C HI-PS Y1 COMPRESSOR CONTACTOR L S W1 LO-PS COMMON R RED YELLOW R R BLACK RED COMPRESSOR A132 DEFROST CONTROL YELLOW CRANKCASE HEATER L2 1 L1 GROUND LUG 208-230/60/1 GROUND L1 DEFROST THERMOSTAT B1 BLACK 1 R A132 208-230/60/1 L Y2 Y1 R C 24V W1 O Y1 Y2
NOTES 506470-01 Issue 1007 Page 28
