Rinnai 37AHA Series Guida all'installazione
37AHA SERIES
HYDRONIC AIR HANDLER
SIZES 045 THRU 090
TrainingManual
The Rinnai Tankless Heating System................... 2
Installation Codes and Standards ......................... 2
Model Number Nomenclature................................ 3
Features............................................................. 4, 5
Performance Specification Summary.................... 6
Inside the Hydronic Air Handler............................. 6
Basic Sequence of Operation...........................7-10
Specifications ...................................................... 11
Installation Configurations.............................12, 13
Multi-Position Orientation .............................. 14, 15
Suspended Cabinet Installation........................... 16
Duct Connections / Air Distribution Ductwork...... 17
Plumbing.............................................................. 18
Accessories ....................................................19-25
Electrical Connections......................................... 26
Dip Switch Options .............................................. 27
Purging and Priming the System......................... 28
Maintenance........................................................ 29
Troubleshooting................................................... 30
Warranty.............................................................. 31
Sample Installation .............................................. 32
Rinnai Tankless Water Heater Sizing............33, 34
Sizing Example.................................................... 35
Parts List........................................................ 36, 37
Product Knowledge Test ..................................... 38
The Rinnai Hydronic Air Handler
(A key component of the Rinnai
Tankless Heating System)
2 Rinnai Corporation Hydronic Air Handler 101 Training Manual
Installation Codes and Standards
The Rinnai Tankless Heating System
The Hot Way to Heat Your Home –
The Tankless Heating System combines the Rinnai tankless water heater and a new
hydronic air handler to provide comfortable residential heat. Now the energy savings
and endless hot water of a Rinnai tankless water heater can be applied to heating both
residential air and water.
How it Works –
The hydronic air handler connects to a Rinnai tankless water heater through normal
plumbing lines. When there is a call for heat, the air handler pump activates and begins
to circulate water between the air handler and the water heater. The hot water runs
through a copper tube/aluminum fin coil mounted above a blower, which drives air
through the coil and into the ductwork, providing comfortable, warm, hydronic heat that
can’t be matched by gas furnaces or heat pumps.
Product Codes and Standards
All national codes, standards and local ordinances must be adhered to in addition to the
instructions accompanying each product. The installation must comply with regulations
of the local building, heating, plumbing and other codes. Where local codes are not
applicable, the installation must comply with national codes and any and all authorities
having jurisdiction.
Suggested Codes and Standards for the United States and Canada:
General Installation –
Installation of Air Conditioning and Ventilating Systems NPFP 91
Duct Systems –
Sizing of duct system to be performed prior to product installation
Sheet Metal and Air Conditioning Contractors National Association (SMACNA)
American Society of Heating, Refrigeration, and Air Conditioning Engineers (ASHRAE)
Fundamentals Handbook Chapter 34 or HVAC Systems and Equipment Handbook
Chapters 9 and 16
US and CANADA; Air Conditioning Contractors Association (ACCA) Manual D
Acoustical Lining and Fibrous Glass Duct
US and CANADA; current edition of SMACNA; NFPA 90B as tested by UL Standards
181 for Class I Rigid Air Ducts
Electrical Connections
US: National Electrical Code (NEC) ANSI/NFPA 70.
CANADA: Canadian Electrical Code CSA C22.1
Plumbing Systems
US and CANADA: ICC International Plumbing Code (IPC); Uniform Mechanical Code
(UMC); Uniform Plumbing Code (UPC)
Rinnai Corporation Hydronic Air Handler 101 Training Manual 3
Model Number Nomenclature
37AH A 045 08 K A 5 Multi-position
5 = Yes
2 = No
Engineering Digit
Denotes minor change
(not present in sales or service
literature)
Voltage Code (V-Ph-HZ)
K = 115 - 1 - 60
L = 240 - 1 - 50 (export models)
Model
37AH - Multi-speed Hydronic Air Handler
Series
Denotes a major design change in the
product line (i.e. capacity)
Nominal Heating Capacity (BTU/h)
045 = 45,000
060 = 60,000
075 = 75,000
090 = 90,000
Cooling / Heating Air Flow Range (CFM)
08 = 800 (650-800)
12 = 1200 (650-1200)
14 = 1400 (1000-1600)
16 = 1600 (1200-1750)
4 Rinnai Corporation Hydronic Air Handler 101 Training Manual
Domestic Hot Water Priority
The Rinnai Hydronic Air Handler includes* a domestic hot water priority flow sensor that
will determine when to shut down and re-direct all the water heater’s output to whichever
fixture and or appliances that are calling for hot water. This feature will turn off the pump
to prevent cold air from blowing into the structure and excessive wear on the internal
pump components.
* The flow sensor is to be installed at the site
–Four models covering nominal heating sizes from 45,000 to 90,000 BTU/hour
–Multi-position (upflow, downflow, horizontal left, horizontal right)
• Modifiable for side-entry return air
• NOTE: the unit is not designed to be installed on its back.
–Low-flow, high-head pump designed to work with Rinnai’s tankless water heaters
–No combustion air infiltration losses when used with a Rinnai tankless water heater
–Four selectable heat blower-off delay times – adjustable fan speeds provide
operational efficiency of heat distribution with 30, 60, 90 and 120 second blower
off settings
–Multi-speed motor
•800 – 1600 Nominal Heating Airflow (CFM)
•Adjustable to meet the needs of the heating and cooling CFM blower
requirements
–Strong steel cabinet
•Pre-painted galvanized steel
Features
AH45 AH60 AH75 AH90
Rinnai Corporation Hydronic Air Handler 101 Training Manual 5
Features •Fully insulated with foil lining
•Low 34-inch profile on all models
–Multi-position electrical junction box. The junction box will mount on either side of
cabinet to adapt to the installation requirements
–Designed for serviceability with removable front panel to obtain access to pump,
blower and control board
–Schrader valve integrated into air handler coil to manually purge air from the system
–Side filter rack (option)
–Control board connections for:
• Electronic Air Cleaner (EAC)
• Humidifier (HUM)
• UV Lamp (UV & N4)
–Intelligent Microprocessor Control
• The Hydronic Air Handler units are equipped with an intelligent microprocessor
control that allows for domestic hot water priority and adapts to available hot water
flow for space heating by automatically regulating the pump and fan sequence to
maximize comfort.
• During the non-heating season, the microprocessor will cycle the pump every six
hours (for two minutes) to prevent the water in the system from becoming stagnant.
The microprocessor will adapt to the domestic hot water usage schedule to ensure
this maintenance cycle will not come on when there is a call for domestic hot water.
During the maintenance cycle, the microprocessor prevents the blower from
operating to prevent dispersing hot air. This process will also cycle during the
cooling season.
–Fine-Tuned to Work with Rinnai Tankless Water Heaters
• The unique hydronic air handlers are designed to work in combination with Rinnai
tankless water heaters to deliver a wide variety of heating capacities that cover a
broad range of residential and light commercial heating spectrums. Because of the
matched system, Rinnai Hydronic Air Handlers are not designed to be installed with
any other tank, tankless or boiler product.
• The resulting Tankless Heating System is the only matched tankless hydronic
solution within the industry!
6 Rinnai Corporation Hydronic Air Handler 101 Training Manual
Performance Specification Summary
*All heating outputs based on 68°return air
External Static Pressure based on 0.5” W.C. without Evaporator Coil
Foil-Faced Insulated Cabinet
Coil Assembly
Hydronic Pump
Blower Assembly (multi-speed motor)
Control Box and Control Board
Filter
Inside the Rinnai Hydronic Air Handler
Model Heating
CFM
Water Temperature
Nominal Heating Outputs (BTU/h) CFM
RANGE
Tons (A/C
or Heat
Pump)
Weight
120°130°140°150°160°
AH45 800 28,000 33,750 39,500 45,000 51,000 650-800 1.5 - 2.0 92 107
AH60 1200 37,500 45,000 52,500 60,000 68,000 650-1200 1.5 - 3.0 109 127
AH75 1400 46,000 55,500 65,000 75,000 84,500 1000-1600 2.5 – 4.0 118 138
AH90 1600 55,000 65,250 77,500 90,000 101,000 1200-1750 3.0 – 5.0 136 159
Shipping
Installed
Rinnai Corporation Hydronic Air Handler 101 Training Manual 7
Basic Sequence of Operation
• The thermostat calls for heat and engages air handler pump creating water flow
• The Rinnai tankless water heater fires and begins heating
• The air separator ensures the circulation loop is purged
• Hot water passes through the hydronic heating coil
• After 25 seconds of pump operation, the blower moves heated air into the structure
• Water continues to circulate through the tankless water heater and hydronic heating coil as
long as there is a call for heat
• Water also flows to domestic hot water fixtures if there is demand. An installed tempering
valve reduces the potential of scalding
Typical Open-Loop Air Handler Operation
8 Rinnai Corporation Hydronic Air Handler 101 Training Manual
Basic Sequence of Operation
• The thermostat calls for heat and engages air handler pump creating water flow
• The Rinnai tankless water heater fires and begins heating
• The air separator ensures the circulation loop is purged
• Hot water passes through the hydronic heating coil
• After 25 seconds of pump operation, the blower moves heated air into the structure
• Water continues to circulate through the tankless water heater and hydronic heating coil as
long as there is a call for heat
• Water also flows to domestic hot water fixtures if there is demand. An installed tempering
valve reduces the potential of scalding
• If domestic demand increases to effect heating capability, the air handler flow sensor sends
signal to turn pump and blower off until domestic flow has decreased
• When the air handler pump stops (either due to domestic demand or a satisfied thermostat),
the blower will continue for 30, 60, 90, or 120 seconds depending on preferred settings
Typical Open-Loop Air Handler Operation
Rinnai Corporation Hydronic Air Handler 101 Training Manual 9
Basic Sequence of Operation
Typical Open Loop-Case coil operation for A/C or Heat Pump
• When the thermostat calls for cooling from the A/C, circulation occurs from the condenser
through the evaporator coil
• Air is blown across the evaporator coil moving cool air into structure (no time delay)
• Similarly, when the thermostat calls for heating from the heat pump, circulation occurs from
the evaporator-coil through the condenser
• Air is blown across the evaporator-coil moving warm air into structure (no time delay)
10 Rinnai Corporation Hydronic Air Handler 101 Training Manual
Basic Sequence of Operation
Typical Open-Loop Air Handler Operation
• When the thermostat calls for cooling from the A/C, circulation occurs from the condenser
through the evaporator coil
• Air is blown across the evaporator coil moving cool air into structure (no time delay)
• Similarly, when the thermostat calls for heating from the heat pump, circulation occurs from
the evaporator coil through the condenser
• Air is blown across the evaporator coil moving warm air into structure (no time delay)
• If the heat pump cannot adequately heat the structure, the thermostat will call for
emergency heating and initiate flow from the water heater, engaging the air handler
• While the hydronic system is in use, the flow sensor again monitors water usage to ensure
adequate heat is delivered
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