Marvaiv Air to Air Vertical Wall Mounted Heat Pumps Engineering Specification Guide

Specification Guide

 

Marvaiv Air to Air Vertical Wall Mounted Heat Pumps Engineering

 

GENERAL

  • Furnish and install a self-contained wall mount air-to-air heat pump suitable for outdoor use. The unit is to be manufactured by Marvair®, a division of Airxcel®, Inc., Model # MAA1 H* with single stage compressor (See Ventilation Configurations, Section 9). The wall mount unit shall be completely factory assembled and tested, and shall include compressor, indoor and outdoor coils, fans and motors as required, prewired controls, interconnecting refrigerant tubing, wiring, disconnects, and other necessary components mounted in a corrosion resistant cabinet. Unit shall be shipped from the factory with a full operating R-410A refrigerant and oil charge. All field wiring shall be in accordance with the National Electric Code and local codes.

 

APPROVALS

  • The complete package shall be ETL Listed and tested to UL Standard 1995, 2nd Edition and CAN/CSA-C22.2 No. 236-95 2nd Edition for safety. The unit shall be certified to the current version of the Air Conditioning and Refrigeration Institute (ARI) Standard 390. The manufacturer of the heat pump shall be ISO 9001 2015 certified.

 

CERTIFIED PERFORMANCE

  • COOLING. When rated at ARI standard 390 with no outside air, the total net cooling capacity of the unit shall be BTUH or greater, and sensible capacity shall be BTUH or greater at conditions of: CFM of evaporator entering air at 80°F dry bulb, 67°F wet bulb and condenser entering air temperature of 95°F dry bulb. Models H series heat pumps shall have an EER of 11 or higher at this condition.
  • HEATING. When rated at ARI standard 390 with no outside air, 70°F dry bulb air entering the indoor coil and 47°F dry bulb outdoor ambient, the heat pump shall have a minimum heating capacity of BTUH and a minimum COP of . When rated at ARI Standard 390 with no outside air, 70°F dry bulb air entering the indoor coil and 17°F dry bulb outdoor ambient, the heat pump shall have a minimum heating capacity of BTUH and a minimum COP of 3.3 or higher at this condition. Supplemental electric heat of kW shall be provided to satisfy heat loss at winter design conditions.

 

CABINET

  • The exterior cabinet shall be constructed of 20-gauge zinc-coated, galvanized G60 steel with a satin beige polyester finish and shall meet the corrosion protection requirements of ASTM standard A 653/A. The finish shall be highly resistant to abrasion, metal marking, staining, pressure mottling and require minimal maintenance. The cabinet shall include a sloped top and built-in mounting flanges. The conditioned air section shall be insulated with 1/2-inch, 2 pound dual density foil backed fiberglass.

 

FILTER

  • Two inch filament spun glass type filter shall be mounted internally, factory supplied, and accessible through an external panel. Provided Filter shall have a MERV rating of _8__ (Select one 8, 11, 13,)

 

COMPRESSOR & REFRIGERATION CIRCUIT

  • The compressor shall be a hermetic scroll type with vibration isolation. The refrigeration circuit shall contain a filter dryer and a TXV (thermal expansion valve) metering device. The refrigeration circuit shall include a high pressure switch and a loss of charge switch with a lockout relay. The compressor motor shall be protected by an internal line break thermostat. Electrical wiring connections at the compressor shall be protected by molded plug.

 

OUTDOOR SECTION:

  • The outdoor coil shall be constructed of aluminum plate fins mechanically bonded to seamless copper tubes.
  • Outdoor fan shall be ECM type direct driven, propeller type for quiet operation. The outdoor motor shall be equipped with a thermal protector. The condenser shall be horizontal discharge design with a heavy duty vinyl coated wire coil guard. The outdoor motor speed is factory set with an ability to adjust by ECM speed control.

 

INDOOR SECTION

  • The indoor coil shall be constructed of aluminum plate fins mechanically bonded to seamless copper tubes.
  • The indoor blower motor shall be an electronically commutated type motor. The motor’s control shall be encapsulated to prevent water from reaching its electronic components. The motor shall automatically deliver constant airflow over a wide range of external static pressures by changing its torque and speed without external sensors. The motor shall be factory programmed to slowly ramp up the speed to eliminate the abrupt change in sound when the motor starts. The Indoor Motor speed is factory set with an ability to adjust by ECM speed control
  • The evaporator drain pan shall be sloped for proper drainage.

FRESH AIR FOR VENTILATION CONFIGURATIONS (Select one)

  • Fresh air ventilation shall be provided at the rate of 0 to 15% of rated air flow by a manual damper. The damper shall be adjusted after installation of the heat pump for required rate of ventilation. “N” = Fixed Position Manual Damper (Standard).
  • Fresh air ventilation shall be provided at the rate of CFM (0 to 450 CFM of fresh air, up to a maximum of 40% of total rated air flow) by a manual damper. The damper shall be adjusted after installation of the heat pump for required rate of ventilation. To ensure proper operation, the ventilation package shall be non-removable, installed and tested at the factory for optimum performance. “Y” = Fixed Position Manual Damper for up to 450 CFM of Fresh Air “NO PRESSURE RELIEF”
  • Fresh air ventilation shall be provided at the rate of CFM (0 to 450 CFM of fresh air, up to a maximum of 40% of total rated air flow) by a manual damper. The damper shall be adjusted after installation of the heat pump for required rate of ventilation. Internal to the heat pump shall be a method of exhausting classroom air to the outside for pressure relief. “Z” = Fixed Position Manual Damper for up to 450 CFM of Fresh Air with Pressure Relief
  • Fresh air ventilation shall be provided at the rate of CFM (0 to 450 CFM of fresh air, up to a maximum of 40% of total rated air flow). The damper shall be adjusted after installation of the heat pump. The factory installed motorized damper shall operate on (24, 120 or 240V – select one) to regulate fresh air ventilation in response to an energy management system or other type of control, external to the Classic™ heat pump. Internal to the heat pump shall be a method of exhausting classroom air to the outside for pressure relief. To ensure proper operation, the ventilation package shall be non-removable, installed and tested at the factory for optimum performance. “D” = Motorized Damper for 450 CFM of Fresh Air with Pressure Relief
  • Fresh air ventilation shall be provided at the rate of CFM (0 to 450 CFM of fresh air, up to a maximum of 40% of total rated air flow). The damper shall be adjusted after installation of the heat pump. The factory installed motorized damper shall operate on (24, 120 or 240V – select one) to regulate fresh air ventilation in response to an energy management system or other type of control, external to the Classic™ heat pump. Internal to the heat pump shall be a method of exhausting classroom air to the outside for pressure relief. To ensure proper operation, the ventilation package shall be non-removable, installed and tested at the factory for optimum performance. “E” = Motorized Damper for 450 CFM of Fresh Air with Pressure Relief and independent damper control.

 

CONTROL CIRCUIT:

  • An integrated circuit board shall provide control of the indoor blower motor, the compressor, the high refrigerant pressure switch, the low refrigerant pressure switch, compressor short cycle protection, and the defrost cycle. In addition, for heat pumps with electric resistance second stage heat, the circuit board shall control the operation of the electric heat during the defrost cycle and when the compressor is operating. The board will have LED’s to indicate power status and high or low refrigerant pressure lockout. A .03 to 10 minute delay on break timer will provide compressor short cycle protection. The board will monitor the status of the high refrigerant pressure switch and the low refrigerant pressure switch. If either of the inputs recognize a fault, the compressor will turn off and the anti-short cycle delay will be initiated. If any of these faults occur twice on a call for mechanical heating or cooling, the control will prevent the compressor from operating until power is manually reset to the heat pump. The control will also monitor the defrost sensor. If the defrost sensor senses a temperature of 32°F (0°C) or below while in the heating mode, it will initiate a pin selectable 30, 60, or 90 minute time period. At the end of the time period, if the defrost sensor is still 32°F (0°C) or below, the reversing valve will be energized. The defrost cycle will terminate on either time or temperature. The maximum time of the defrost cycle is 10 minutes. However, if at any time during the defrost cycle the defrost sensor registers a temperature of 75F (10°C) or higher, the defrost cycle will be terminated.
  • The board shall have pin type, field selectable jumper “YES / NO” to either allow electric heat and the compressor to operate simultaneously or (“S” circuit”) to prevent the electric heat and the compressor from operating simultaneously.
  • The board shall have pin type, field selectable jumper “YES / NO” to either allow electric heat and the compressor to operate during the defrost cycle or to prevent the electric heat and the compressor from operating during the defrost cycle. If the electric heat is not enabled during compressor operation as described in 10.1, the electric heat will not operate during the defrost mode.
  • The circuit board shall have a pin type, field selectable jumper to control operation of the motorized fresh air damper (Ventilation option “B”).

ELECTRICAL DISCONNECT

  • The heat pump shall have a factory installed disconnect on all models designed for use on 208/230V and or 460 V power supply.

SUPPLY AIR GRILLE (Required for non-ducted applications)

  • The supply grille shall be an adjustable aluminum, double deflection grille, factory provided.

RETURN AIR GRILLE (Select one)

  • The return air grille shall be an aluminum grille, factory provided.
  • The return air filter grille shall be an aluminum grille with integral filter, factory provided.

PAN UNDER OUTDOOR COIL (Optional, select if desired. Prevents condensate and water from defrost cycle from collecting under heat pump. Allows water to be piped away.)

  • Factory installed water pan under outdoor coil.

 

THERMOSTAT (Select one)

  • Heat pump thermostat shall be a digital, 7 day, 5-2 and 5-1-1 day programmable thermostat. Two stage heat/Two stage cool. Manual or auto changeover. Fan: Auto & On. Permanent retention of setting on power loss. Field adjustable temperature calibration. Adjustable max. setpoint for heating and min. adjustable setpoints for cooling. Adjustable temperature differential. Keypad lockout. Status LED. °F or °C selectable.
  • Heat pump thermostat shall be a digital, seven day, two occupied and two unoccupied periods for each day of the week programmable thermostat. Three stage heat/three stage cool. Manual or auto-changeover (selectable). Fan: Auto or On. (selectable). Ten year retention of program settings and 48 hour clock and time settings on power loss. Adjustable maximum set point for heating and minimum set point for cooling. Adjustable temperature differential. Keypad lockout. Status LED’s. °F or °C selectable. Optional remote sensors for outdoor air, supply air and humidity. Title 24 compliant.
  • Heat pump thermostat shall be a digital, non-programmable thermostat. Two stage heat/Two stage cool. Manual or auto changeover. Fan: Auto & On. Permanent retention of setting on power loss. Field adjustable temperature calibration. Adjustable max. setpoint for heating and min. adjustable setpoints for cooling. Adjustable temperature differential. Keypad lockout. Status LED. °F or °C selectable.
  • Heat pump thermostat shall be a MAR7000 people sensing, (Optional CO2 Sensing) automatic setback digital thermostat. Using an occupancy sensor, the thermostat shall have the capability to determine whether the room is occupied or vacant. When people are present, the temperature is automatically maintained. When vacant, the thermostat automatically shall reduce the run time of the heat pump and the ventilation cycle to save energy. The thermostat shall have a dedicated relay to control the ventilation cycle. The relay may receive an input from an occupancy sensor, a light sensor or other external device. The MAR7000 thermostat shall continually update the occupancy pattern to ensure that the set point temperature is achieved within a specific time when an occupant returns to the room. Set points shall be kept in memory for up to 3-1/2 weeks in the event of a power loss. The thermostat shall have an integral, solid state humidity/dew point sensor. This sensor shall activate the heat pump to limit humidity in the classroom. The thermostat shall be capable of recording occupancy and HVAC usage patterns for management reports. The thermostat shall be UL listed, FCC certified, and Energy Star qualified.

 

OPTIONAL CONTROLS

  • Locking thermostat cover.
  • Six hour spring-wound timer.
  • VMR Ventilation motor control relay. Provides a 24 VAC coil to control operation of the ventilation option from an external control system.
  • Outdoor thermostat – Adjustable thermostat to control operation of electric heat. A factory installed thermostat that prevents the electric heaters from being energized unless the outdoor temperature is below the set point.

 

CONTRACTOR INSTALLATION

  • The heat pump shall be installed in accordance with the written instructions provided by Marvair®.
  • Line and control voltage connections shall be made to the appropriate terminals within the heat pump’s control box.
  • All external control devices shall be wired to the appropriate terminals within the heat pump’s control box.

 

Marvaiv Air to Air Vertical Wall Mounted Heat Pumps Engineering Specification Guide – Marvaiv Air to Air Vertical Wall Mounted Heat Pumps Engineering Specification Guide –

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