The Signature Series is NOT designed for amateur installation. Installation SHOULD be performed by an authorized technician. Please read this manual carefully before installation and keep it for future reference. Installation Manual Signature Series MHP15*A HEAT PUMP SPLIT SYSTEM The Signature Series is NOT designed for amateur installation. Installation SHOULD be performed by an authorized technician. Please read this manual carefully before installation and keep it for future reference.
INSTALLATION INSTRUCTIONS MHP15*A HEAT PUMP SPLIT SYSTEM (R410A REFRIGERANT) This manual must be left with the homeowner for future reference. This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in manuals, be alert to the potential for personal injury or death. Table of Contents Safety Precautions ......................................................2 Installation ...................................................................2 Electrical Connections ...
These units are designed for use in residential and light commercial type buildings. Heat Pumps may only be installed with indoor combinations listed in the Air Conditioning, Heating and Refrigeration Institute (AHRI) Inspect the unit for any damage before installation. If damage is found, notify the transportation company Safety Precautions Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for brazing operations.
Liquid Vapor Capacity Connections Dia. Tube Dia. Connections Dia. Tube Dia. -018 3/8” 3/8” 3/4” 3/4” -024 3/8” 3/8” 3/4” 3/4” -030 3/8” 3/8” 3/4” 3/4” -036 3/8” 3/8” 7/8” 7/8” -042 3/8” 3/8” 7/8” 7/8” -048 3/8” 3/8” 7/8” 7/8” -060 3/8” 3/8” 7/8” *1-1/8” * Field supplied 7/8 x 1-1/8 connector required on both ends of vapor tubing. Table 1. Recommended Liquid & Vapor Tube Diameters (in.) Figure 1.
Before making braze connections, be sure all joints are clean. Before heat is applied for brazing, dry nitrogen and scale formation on the inside of the tubing. 1. Connect the vacuum pump to the center hose of the manifold gauge set, the low-pressure manifold gauge to the vapor service valve and the high pressure manifold gauge to the liquid service valve.
Control Wiring Electrical Connections The control voltage is 24 VAC. NEC Class I insulated 18 AWG is required for control wiring. For lengths longer than 150 feet, contact your local distributor for technical service. WARNING Ensure the room thermostat is properly installed per instructions shipped with room thermostat. Generally the thermostat should not be exposed to sunlight, drafts or vibration and should not be mounted on exterior walls.
Start-Up Procedure 1. Blower charts are calculated with a dry or wet coil basis. Check to ensure: • Service valve and gage port caps are installed and tightened. • Voltage supply at unit agrees with nameplate rating. • Field wiring connections are tight and factory wiring has not been disturbed and are tight. • Indoor fan motor is on correct speed tap. Btuh) through a wet coil. Refer to indoor unit instructions for The optimum method for checking the charge is by weight.
Operation The outdoor unit and indoor blower cycle on demand from the room thermostat. When the thermostat blower switch is in the ON position, the indoor blower operates continuously. Emergency Heat Function (Room Thermostat) An emergency heat function is designed into some room thermostats. This feature is applicable when isolation of outdoor unit is required or when auxiliary electric heat is staged by outdoor thermostats.
During a single demand cycle, the defrost control will lock by any pressure switch wired to the control board. In addition, the diagnostic LEDs will indicate a locked-out pressure switch. The unit will remain locked out until power to the board is interrupted, then re-established or until the jumper is applied to the TEST pins for 0.5 seconds.
Figure 4. SEER Wiring Diagram 506318-03C mrcool.
Homeowner’s Information different manufacturers. The information below is typical for WARNING regarding the model of thermostat installed. ELECTRICAL SHOCK HAZARD! Turn OFF electric power to unit before performing any maintenance or removing panels or doors. FAILURE TO DO SO COULD RESULT IN BODILY INJURY OR DEATH.
Important System Information • Your system should never be operated without a clean of your unit and could cause damage to the condenser. • Return air and supply air registers should be free from Periodically, debris should be brushed from the condenser coils. WARNING Regular Maintenance Requirements SHARP OBJECT HAZARD! service technician. These regular visits may include (among other things) checks for: Condenser coils have sharp edges. Wear adequate body protection on body extremities (e.g.
Signature Series MHP15*A HEAT PUMP SPLIT SYSTEM ELECTRICIAN and/or HVAC TECHNICIAN: LICENSE #: INSTALLATION DATE: INSTALLATION LOCATION: SERIAL NUMBER: The design and specifications of this product and/or manual are subject to change without prior notice. Consult with the sales agency or manufacturer for details.
