Lifebreath AH-U-S4A-24-P16, AH-U-L2B-48-P16, AH-U-L4A-36-P16, AH-U-S2A-30-P16, AH-U-L2A-36-P16 Operation, Sizing And Installation Manual
Operation, Sizing and Installation Manual
AIR HANDLER
MANUFACTURED WITH
AIRCOM ELECTRONICS
Models
AH-U-S4A-24-P16 (E16)
AH-U-L4A-36-P16 (E16)
AH-U-S2A-30-P16 (E16)
AH-U-L2A-36-P16 (E16)
AH-U-L2B-48-P16 (E16)
* LEAVE FOR HOMEOWNER
NOTE: Due to ongoing research and product development, specifications,
ratings and dimensions are subject to change without notice.
69-AH
091517
Table of Contents
Air Condition coil freezing can damage the
hydronic coil of the Air Handler.
Install a Freeze Thermostat Kit to your air
conditioning coil to prevent coil freeze up. Check
with your air conditioner distributor to obtain a
Freeze Thermostat Kit.
ATTENTION
The Air Handler hydronic coil is not to be used for
chilled water applications where condensation is
expected.
ATTENTION
Introduction.......................................................................3
Overview of the AH..........................................................3
Description and Purpose ..................................................4
Operation Heating/Cooling...............................................4
Combo System Basic Principles .......................................5
Plumbing......................................................................6-11
Installation ......................................................................12
Function and Controls ...............................................13-14
Aircom Relays ................................................................15
Start-Up Procedure .........................................................15
Troubleshooting ..............................................................16
Model Number Nomenclature Breakdown .....................17
Specifications ............................................................18-22
Work Sheets...............................................................23-28
Wiring Diagrams .......................................................29-30
2
Introduction
Hydronic Coil
and Pump
Compartment
Aircom
Electronics
and Fan
Compartment
You will notice that the heated air in your home feels more
comfortable than air heated by a conventional furnace. One
reason for this is that LIFEBREATH's hydronically heated
air is uniform and temperate... no short blasts of hot air or
hot and cold temperature spikes. In this regard, the air flowing from your hot air vents will not feel as hot to the touch
as air from a conventional furnace.
With a high efficiency, adequately sized natural gas,
propane or oil hot water heater/boiler, you will always have
plenty of hot water for showers and baths, washing dishes
and clothes, and all other normal domestic hot water needs.
If there is an unusually high demand for hot water, such as
filling a large hot tub, than all you need to do is allow more
time for the task so the water heater/boiler can keep up to
its job of providing hot water for the heating system as well
as other household uses.
Overview of the Air Handler
Once it is correctly installed, safety will never be an issue
with your LIFEBREATH air handler. No flames, fumes or
flue gases to be concerned about. Your domestic hot water
heater/boiler now provides the heat source for your furnace.
This Operating and Installation Guide will help you learn
about your LIFEBREATH Air Handler quickly and easily.
The table of contents will show you where to find informati on on ev ery feature of this un it along with e asy t o
understand operating instructions. If, however, you do
encounter a question that is not covered in this Guide you
should call the LIFEBREATH dealer who installed your
furnace. Chances are that he will be able to give you a satisfactory answer but if he is unable to do so then we invite
you to contact us directly.
Airia Brands Inc.
3
Description and Purpose
IMPORTANT NOTE
The purpose of this manual is to act as an installation guide
only for the LIFEBREATH Air Handler. Manufacturers'
instructions f or other components, such as the waterheater/boiler, must be followed.
All national and local code requirements must be met when
installing a LIFEBREATH Air Handler. Be sure to consult
the proper authorities.
Note: Temperatures greater than 130°F (54°C) pose a seri-
ous risk of scalding individuals running domestic
hot water for potable use.
This appliance complies with IAS Canada Inc. Requirement
CR95-003, Additional Requirements for Fan Coil Units for
use with Potable Water Heaters.
All piping and components connected to this appliance shall
be suitable for use with potable water.
Toxic chemicals, such as used for boiler treatment, shall not
be introduced into the potable water heater system.
When using this system, and water for space heating is
Operation Heating/Cooling
required to be at a higher temperature than for other uses, an
anti-scald valve shall be used to ensure water for other uses
is reduced in temperature to minimize a scald hazard potential.
Combining two or more end uses such as space heating and
the heating of domestic hot water in a single system has the
potential to increase efficiency and reduce overall capital
costs. However, the proper design, installation, and commissioning of these systems are critical if these advantages
are to be realized.
This manual provides a guideline of good engineering practice i n the design, i nstallation a nd commissioning of
Integrated Combo Systems. The guidelines in the manual
are designed for residential forced warm air Integrated
Combo Systems which utilize domestic water heaters or
boilers and the LIFEBREATH furnace. Heating and cooling
loads shall be calculated in accordance with recognized
Residential Heat Loss and Heat Gain Calculation methods.
Duct design shall comply with recognized Residential Air
System Design methods.
When the room thermostat calls for heat, it activates a circulation pump located inside the Air Handler. This pump
delivers hot water from the water heater, through the furnace coil and back to the water tank. Simultaneously, the
furnace blower switches on to high speed and will start circulating air across the coil, which picks up heat and delivers
it to the rest of your home.
Once the thermostat's temperature is reached the pump will
shut off, and the blower will return to its pre-set speed or
off.
Note: When the furnace blower is left running on low
speed the air in the home circulates continuously. When
the heat is called for the blower will automatically switch
to a higher speed. After the required hot air has been
delivered the blower will switch back to low speed.
When the thermostat calls for cooling (evaporator coil and
condensing unit required), the furnace blower activates to
high speed and the outdoor condenser unit is energized.
After the thermostat temperature is reached, the condensing
unit will shut off and the blower will return to its preset
speed or off.
Off Season Circulation Timer
All models are equipped with a circulation timer. It is normal operation for these models to automatically run the
circulation pump for a short period of time intermittently.
4
WATER HEATER
DOMESTIC HOT WATER
SUPPLY AIR
BLOWER
HEATING COIL
RETURN AIR
COLD WATER INLET
ANTI-SCALD VALVE
(WHEN REQUIRED)
VALVE
(shut off)
VALVE
(shut off)
VALVE
(shut off)
VALVE
(balancing)
COOLING COIL
(OPTIONAL)
DRAIN
VALVE
EXPANSION TANK
OR OTHER MEANS
(WHEN REQUIRED)
CHECK
VALVE
Combo System Basic Principles
ATTENTION
Check valves should always be installed in a
vertical rise with the flow of water shown.
Open and Closed Systems
Open and Closed systems both deliver hot water and space
heating.
Water systems that incorporate a pressure tank (i.e. well
systems) are normally Open Systems and most municipal
water systems are Closed Systems.
Closed Loop System
A system becomes closed when a Check Valve or a backflow prevention valve is installed in the cold water piping
upstream of the water heater.
A check valve will prevent water being relieved into the
cold water system due to pressure created when
water is heated in the water heater.
Drain Valve
A drain valve is required to allow the heating loop to be
drained for service or repair and to remove air from the
heating loop when commissioning a system. The drain
valve should be near the low point of the return piping system to be near the water heater. Ball, Globe or Gate Valves
are suitable for drain valves.
IMPORTANT
Refer to local codes, local bylaws and installation
manuals supplied with water heater before starting
any installation work.
This Check Valve
minimizes ThermoSiphoning. Thermo
Siphoning is the cold
water backflowing
through the heating
loop when domestic
hot water is called
for.
5
Conventional
Cooling Coil
(Not available
through Airia)
Plumbing
Water
Heater
To
House
CAF
or
AH
Min. 12" (305 mm)
above top of
CAF / AH
12"
Water
Heater
CAF
or
AH
Min. 12" (305 mm)
above top of
CAF / AH
To
House
12"
There is an integrated check valve in the coil assembly of
the CAF / AH unit.
Figure 1
Note: Take care during soldering to avoid debris or
solder from lodging in the check valve.
Note: It is critical to follow the piping configuration
shown. Maintain a minimum distance of 12” above
the CAF/AH. This will minimize thermal siphoning in
the combo system.
Figure 2
* It should be noted that problems have been observed when using the side
tappings on certain water heaters; therefore, it is strongly recommended to use the top
water tappings as indicated in Figure 1 to minimize thermal siphoning and related
issues.
6
Plumbing
WATER HEATER
DOMESTIC HOT WATER
SUPPLY AIR
BLOWER
HEATING COIL
RETURN AIR
COLD WATER INLET
ANTI-SCALD VALVE
(WHEN REQUIRED)
VALVE
(shut off)
VALVE
(shut off)
VALVE
(shut off)
VALVE
(balancing)
COOLING COIL
(OPTIONAL)
DRAIN
VALVE
EXPANSION TANK
OR OTHER MEANS
(WHEN REQUIRED)
CHECK
VALVE
Expansion Tanks
Expansion tanks are required in addition to a Check Valve
for Closed Systems because pressure is created when water
is heated in the water heater.
The expansion tank has an air bladder which will contract to
relieve pressure in the system. The tank should always be
connected to the cold water piping between the water heater
shut off valve and the cold water inlet to the water heater.
Anti-Scald Valve
An anti-scald valve is required when the water heater thermostat is set above 140°F (60°C). Also, an anti-scald valve
may be required for all installations by the “authority having jurisdiction”. The valve is placed in the hot water supply
piping from the water heater downstream of the heating
loop connection and upstream of any domestic hot water
connection.
The purpose of the valve is to limit the maximum temperature available for domestic hot water by mixing hot water
from the water heater with cold water from the municipal
supply.
The Anti-Scald valve must be thermostatically controlled
and approved to the ASSE standard No. 1016 and 1017 for
use as an anti-scald device.
Time to Scald
(1st degree burns)
Temperature Time
120°F (49°C) 8 min.
130°F (54°C) 20 sec.
140°F (60°C) 3 sec.
160°F (71°C) <1 sec.
Closed Loop System
Conventional
Cooling Coil
(Not available
through Airia)
7
(a)
H
C
(b)
(c)
Supply
Return
Plumbing
Valves
(a) Located on the cold water side of the Heater.
This valve has the ability to isolate the hot water
(domestic and space heating) from the household cold
water supply. Every water heater requires this valve
regardless of space heating use.
(b) Located on the hot water supply side of the heating
loop, downstream of its connection to the domestic
water.
(c) Located on the return side of the heating loop upstream
of its connection to the domestic cold water.
These two
valves isolate
the heating
loop for
service or
repair.
Ball Valve
The Ball Valve can be used as a shut off or drain valve.
When in the open position, a full bore ball valve has very
little resistance to flow, and these valves tend to be both the
least expensive and the least susceptible to seizing over
time. Do not use reduced bore ball valves as they are very
restrictive to water flow.
Gate Valve
Globe Valve
The Globe valve can be used as a shut off, drain or throttling valve. Even in the open position, the valve is fairly
restrictive to flow. It has a much greater equivalent length
(resistance.) than the other types of valves.
Balancing (Throttling) Valve
The Gate Valve can be used as a shut off or drain valve.
When in the open position, there is very little resistance to
flow. Gate valves tend to be less expensive than other types
of valves but are susceptible to chatter (noise) and malfunction with age.
The Balancing (Throttling) Valve is used to reduce the
water flow rate and thereby increase the water temperature
drop. This is done to ensure proper activation of the water
heater thermostat.
A Globe Valve could also be used for Balancing (Throttling)
but has more resistance than the Balancing Valve.
8
Plumbing
WATER HEATER
DOMESTIC HOT WATER
S
UPPLY AIR
BLOWER
CHECK
VALVE
R
ETURN AIR
COLD WATER INLET
ANTI-SCALD VALVE
(WHEN REQUIRED)
VALVE
(shut off)
VALVE
(shut off)
V
ALVE
(shut off)
VALVE
(balancing)
COOLING COIL
(
OPTIONAL)
DRAIN
VALVE
HEATING COIL
Plumbing components and system
configuration may vary from diagrams
portrayed.
ATTENTION
Chemicals (such as boiler system additives)
cannot be added to a domestic hot water system.
ATTENTION
Call for Space Heating
There are two thermostats controlling every combo system,
the water heater thermostat (controlling the hot water temperature) and the room thermostat (controlling the room air
temperature).
Open Loop System
When the room thermostat calls for heat, the circulation
pump is activated. Hot water is then drawn from the top of
the water heater through the air handler, and then returned
to the water heater.
Hot Water Temperature Drop
The water heater thermostat will initiate the water heater as
required as long as there is a 20°F (11°C) temperature drop
between the hot water supplied to the air handler and the
returning water.
A temperature drop less than 20°F (11°C) can cause the
water heater thermostat not to initiate. This will result in a
lower hot water supply temperature or poor space heating
performance with fluctuating domestic water temperatures.
Call for Domestic Hot Water and Space Heating
When both return water from the space heating loop and
new cold water (replacing domestic water being used)
enters the water heater, the mixed entering water is cool
enough to activate the thermostat quickly. In this situation,
the water heater must be capable of satisfying the combined
need for domestic hot water and space heating at the same
time.
9
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