ENERGY KINETICS Ascent Combi Service manual

Ascent Combi and Ascent Plus Combi Gas – January 2024
MH27877
ANSI Z21.13-2014
Low-Press Boiler
Ascent™ Combi and
Ascent™ Plus Combi
Boilers
Model EK1T & EK1T+ Gas Fired
OWNER AND INSTALLATION MANUAL
Manufactured By:
Energy Kinetics, Inc.
51 Molasses Hill Road
Lebanon, NJ 08833
[phone]
www.energykinetics.com
INSTALLER: HANG THIS INSTRUCTION MANUAL AND ACCESSORY INSTRUCTIONS VISIBLY NEXT
TO THE BOILER USING THE SUPPLIED POUCH.
HOMEOWNER/USER: READ AND SAVE THIS INSTRUCTION MANUAL AND ACCESSORY INSTRUCTIONS FOR
FUTURE REFERENCE.
ASME certified by EKI.
Certificate plate is under
the jacket on the steel
vessel.
National Board
Listed
For Polypropylene Venting For Conventional Venting

Ascent Combi and Ascent Plus Combi Gas – January 2024 1
PLEASE READ THIS FIRST
Special Attention Flags
Please pay particular attention to the following flags when you see them throughout this manual.
DANGER: Notifies you of hazards that WILL cause severe personal injury, death or substantial property damage.
WARNING: Notifies you of hazards that CAN cause severe personal injury, death or substantial property damage.
CAUTION: Notifies you of hazards that WILL or CAN cause minor personal injury or property damage.
NOTICE: Notifies you of special instructions on installation, operation, or maintenance that are important, but not
normally related to injury or property damage hazards.
Best Practice: Suggestions of best practices developed over many years of experience by professionals.
WARNING: Installation and service must be performed by a qualified installer, service agency, or gas supplier.
Retain this manual for use by your qualified service technician only. Should you observe unusual or
abnormal operation of the burner or boiler, contact your qualified service technician immediately. Do not
attempt to service or repair this product yourself.
WARNING: If the information in this manual is not followed exactly, a fire or explosion may result, causing property
damage, personal injury or loss of life.
WARNING: Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other gas
appliance.
Provide unobstructed combustion air openings sized and located per boiler manual and applicable
codes.
WHAT TO DO IF YOU SMELL GAS
 Do not try to light any appliance.
 Do not touch any electrical switch; do not use any phone in your building.
 Immediately call your gas supplier from an outside phone.
 Follow the gas supplier’s instructions.
 If you cannot reach your gas supplier, call the fire department.

Ascent Combi and Ascent Plus Combi Gas – January 2024 2
WARNING:
Have the burner/boiler started up and serviced at least once annually by a qualified service technician.
Professional care is necessary to properly service your equipment and verify it is operating reliably.
Failure to properly maintain the equipment could result in severe personal injury, death or substantial
property damage.
WARNING: You must keep the area around the burner/boiler free from the following. Failure to comply could result in
severe personal injury, death or substantial property damage due to potential fire, explosion or equipment
damage from corrosive flue products.
 Do not store or use gasoline or other flammable vapors or liquids near or in the same room as the
burner.
 Do not use or store laundry products, paint, varnish, thinner or other such chemicals near or in the
same room as the burner/boiler. These chemicals cause creation of acids in the burner, heat
exchanger and vent system that can cause severe damage.
 Do not store combustible materials near or in the same room as the boiler or any other combustion
appliance.
CAUTION: DO NOT TAMPER WITH THE UNIT OR CONTROLS – CALL YOUR SERVICE PERSONNEL.
WARNING: Improper installation, adjustment, alteration, service or maintenance can cause property damage,
personal injury (exposure to hazardous materials) or loss of life. Refer to the user’s information manual
provided with this boiler. Installation and service must be performed by a qualified installer, service
agency or the gas supplier (who must read and follow the supplied instructions before installing, servicing,
or removing this boiler. This boiler contains materials that have been identified as carcinogenic, or
possibly carcinogenic, to humans).
Homeowner/User: General care and maintenance of your boiler:
 Please read through the information provided for you in this manual. Ask your qualified service technician to explain
normal operation of your equipment.
 Daily inspect the space around the burner/boiler to verify the area is clean and free of the materials listed above.
 Monthly watch the operation of your burner/boiler through an operating cycle to verify normal operation. If you notice
unusual conditions or equipment behavior, contact your qualified service technician. Follow the instructions on the
next page to shut down the burner/boiler while waiting for the technician.

Ascent Combi and Ascent Plus Combi Gas – January 2024 3
FOR YOUR SAFETY READ BEFORE OPERATING
A. This burner does not have a pilot. It is
equipped with an ignition device which
automatically lights the burner. Do not try
to light the burner by hand.
C. Use only your hand to turn the gas control
knob. Never use tools. If the knob will not
turn by hand, don’t try to repair it, call a
qualified service technician. Force or
attempted repair may result in a fire or
explosion.
B. Before OPERATING, smell all around the
boiler area for gas. Be sure to smell next to
the floor because some gas is heavier than
air and will settle on the floor. See below.
WHAT TO DO IF YOU SMELL GAS
 Do not try to light any appliance.
 Do not touch any electric switch; do not
use any phone in your building
 Immediately call your gas supplier from a
neighbor’s phone. Follow the gas
supplier’s instructions.
 If you cannot reach your gas supplier, call
the fire department.
D. Do not use this boiler if any part has been
under water. Immediately call a qualified
service technician to inspect the boiler and
to replace any part of the control system
and any gas control, which has been under
water.
OPERATING INSTRUCTIONS
1. STOP! Read the safety information above.
2. Set the thermostat(s) to their lowest setting.
3. Turn off all electrical power to the burner/boiler.
4. This burner is equipped with an ignition device which automatically lights the burner.
5. Do not try to light the burner by hand.
6. Turn Gas control knob clockwise to OFF.
7. Wait five (5) minutes to clear out any gas. Then smell for gas, including near the floor. If you
smell gas, STOP! Follow the safety information above. If you don’t smell gas, go to the next
step.
8. Turn Gas control knob counterclockwise to ON.
9. Set thermostat(s) to desired setting.
10. Turn on all electric power to the burner and boiler.
11. If the burner/boiler will not operate, follow the instructions “TO TURN OFF GAS TO THE
BURNER” below and call your service technician or gas supplier.
TO TURN OFF GAS TO THE BURNER
1. Set thermostat(s) to their lowest setting.
2. Turn off all electric power to the burner and boiler if service is to be performed.
3. Turn Gas control knob clockwise to OFF. Do not force.
WARNING: If you do not follow these instructions exactly, a fire or explosion may result
causing property damage, personal injury or loss of life.

Ascent Combi and Ascent Plus Combi Gas – January 2024 4
TABLE of CONTENTS
HOMEOWNER/USER NOTE: ................................................................................................................................................... 5
RECORD OF INSTALLATION ................................................................................................................................................... 6
SCOPE ...................................................................................................................................................................................... 6
INSTALLER NOTE: ................................................................................................................................................................... 6
ASCENT AND ASCENT PLUS COMBI BOILERS .................................................................................................................... 7
PRINCIPLE OF OPERATION .................................................................................................................................................... 7
RECEIVING and UNPACKING .................................................................................................................................................. 8
LOCATION and CLEARANCE .................................................................................................................................................. 8
COMBUSTION AIR ................................................................................................................................................................... 9
CONVENTIONAL CHIMNEY VENTING – EK1T ASCENT COMBI ONLY ............................................................................. 10
L-VENT CHIMNEY – EK1T ASCENT COMBI ONLY .............................................................................................................. 11
B-VENT CHIMNEY – EK1T ASCENT COMBI ONLY .............................................................................................................. 11
POLYPROPYLENE VENTING – EK1T+ ASCENT PLUS COMBI ONLY ............................................................................... 11
GAS BURNER SETTINGS ...................................................................................................................................................... 12
GENERAL ASSEMBLY ........................................................................................................................................................... 13
PIPING ..................................................................................................................................................................................... 14
ZONE CONTROL .................................................................................................................................................................... 16
BOILER BYPASS CIRCULATOR ............................................................................................................................................ 17
FILLING WITH WATER, VENTING, and PURGING ............................................................................................................... 17
BOILER WATER TREATMENT ............................................................................................................................................... 18
ANTI-FREEZE ......................................................................................................................................................................... 18
WINTERIZING ......................................................................................................................................................................... 18
LINE VOLTAGE WIRING DIAGRAMS .................................................................................................................................... 19
WIRING and CONTROLS ....................................................................................................................................................... 21
ELECTRICAL CONNECTION - LINE VOLTAGE .................................................................................................................... 21
LOW VOLTAGE WIRING ........................................................................................................................................................ 21
HYDROSTAT CONTROL SETTINGS ..................................................................................................................................... 21
ADVANCED SETTINGS .......................................................................................................................................................... 22
SELECTING ADVANCED SETTINGS .................................................................................................................................... 22
EMERGENCY WIRING ........................................................................................................................................................... 23
HOT WATER DIAGNOSTICS ................................................................................................................................................. 25
PREPARE FOR START UP .................................................................................................................................................... 27
START UP PROCEDURE ....................................................................................................................................................... 27
BOILER OPERATION AND SAFETY CHECKS ...................................................................................................................... 27
GAS BURNER OPERATION ................................................................................................................................................... 28
The AIR-FREE METHOD of MEASURING CO ....................................................................................................................... 29
ANNUAL TUNE UP & INSPECTION ....................................................................................................................................... 30
HOT WATER MAINTENANCE ................................................................................................................................................ 33
RATINGS ................................................................................................................................................................................. 34
REPLACEMENT PARTS ......................................................................................................................................................... 35

Ascent Combi and Ascent Plus Combi Gas – January 2024 5
HOMEOWNER/USER NOTE:
EMERGENCY SHUT DOWN INSTRUCTIONS:
Turn power off to boiler by switching the “Burner Emergency Switch” (typically located at the top of basement stairway
or at boiler room entrance) to the OFF position. Shut off gas supply valve.
NOTICE
Do not use this boiler if any part has been under water. Immediately call a qualified service technician to inspect the
boiler and to replace any part of the control system which has been under water and replace any other parts that may pose
a safety or health risk.
IN CASE OF NO HEAT
In case of no heat coming from the boiler, perform the following actions or call a qualified service agency for help.
 Look at the LEDs on the burner control. If the screen shows “LOCKOUT” or the red LED is on (constantly on
legacy controls), then press and hold in the reset button for one second. The burner will then try to relight. If the
burner relights successfully, then no further action is needed.
 If the burner goes into lock out again, contact a qualified service agency for help.
ANNUAL MAINTENANCE
The Ascent Combi and Ascent Plus Combi boilers require an annual tune-up by a qualified service agency to maintain
top efficiency and peak performance and to verify proper performance of all safety devices.
PERIODIC MAINTENANCE
The Ascent Combi and Ascent Plus Combi boilers require minimal attention from the user.
- Daily inspect the space around the burner/boiler to verify the area is clean and free of any flammable or combustible
materials.
- Once a month it is recommended that the owner/user inspect the boiler and to watch the operation of the boiler. The
owner/user should:
 Inspect flue connections.
o Look for evidence of deterioration from corrosion or other sources. Watch the flue and vent pipes during a
startup of the boiler and look and smell for evidence of escaping flue products.
o For a chimney installation, particularly examine the joint between the boiler outlet and the flue pipe. Also
examine the joint between the flue pipe and the base of the chimney.
 Inspect for evidence of water, such as leakage from the safety pressure relief valve.
 Watch the Ascent Hydrostat control during one heating cycle of the boiler.
 Verify the pressure gauge on the boiler is reading between 5 psi and 30 psi.
 Verify the temperature gauge on the boiler reads no more than 220F at the end of a heating call.
If any of the above items seem unusual or out of the ordinary, then immediately call your qualified service agency.

Ascent Combi and Ascent Plus Combi Gas – January 2024 6
RECORD OF INSTALLATION
INSTALLER NAME:
INSTALLER ADDRESS:
INSTALLER CITY, STATE:
DATE INSTALLED:
NOTES:
SCOPE
This manual covers the Energy Kinetics Ascent Combi Boiler and Ascent Plus Combi boilers. These boilers are
designed and equipped and have been tested to generate hot water in a low pressure closed loop system. The boiler is a
major component of a closed loop system that can be used as a heat source for hydronic, radiant, domestic hot water, spa,
and/or pool heating systems. Call Energy Kinetics to obtain piping and wiring instructions for applications, such as hydronic
heating, radiant heating, domestic hot water, swimming pool heating, multiple boilers, primary/secondary injection loops,
etc. The installer of the system is responsible for the final design of the system and for adding the balance of the needed
parts to complete the system.
COMMONWEALTH OF MASSACHUSETTS
When the boiler is installed within the Commonwealth of Massachusetts:
 This product must be installed by a licensed plumber
 If antifreeze is used, a reduced pressure backflow preventer device shall be used.
INSTALLER NOTE:
ALL INSTALLATIONS MUST BE MADE IN ACCORDANCE WITH ALL NATIONAL, STATE AND LOCAL,
PLUMBING, HEATING AND ELECTRICAL CODES THAT MAY DIFFER FROM THIS MANUAL AND IN
ACCORDANCE WITH THE FOLLOWING CODES, AS APPLICABLE:
N.F.P.A. No. 70: National Electrical Code A.N.S.I. / N.F.P.A. No. 211: Chimneys, Fireplaces, Vents and Solid Fuel
Burning Appliances A.N.S.I. Z223.1/N.F.P.A. No. 54: National Fuel Gas Code If this gas-fired boiler is converted
to oil-fired by field mounting a listed oil conversion burner, then install in accordance with A.N.S.I./N.F.P.A. No.
31: Installation of Oil Burning Equipment.
These codes are available from:
National Fire Protection Association
1 Batterymarch Park
Quincy, MA 02269-9101.
A hot water boiler installed above radiation level or as required by the Authority having jurisdiction, must be
provided with a low water cutoff device.
A boiler should be installed in such a manner that, if the pressure vessel or any connection thereto should leak,
the resulting flow of water will not cause damage to the area in which it is installed.
A hot water storage tank should be installed in such a manner that, if the storage tank or any connection thereto
should leak, the resulting flow of water will not cause damage to the area in which it is installed.
A boiler’s pressure relief valve, hot water storage tank T&P relief valve, backflow preventer, and all other
devices must be piped to the nearest drain to avoid damage in the event the valve is actuated.
Make sure relief discharge pipes from all reliefs are properly placed to safely contain discharge. Make sure
relief discharge pipes, such as from a boiler or a hot water storage tank, will safely contain hot water and/or
boiling water. Make sure relief discharge pipes, such as from a boiler or a radiant heating system, will safely
contain water treated with boiler chemicals and/or antifreeze. Reliefs include the boiler pressure relief valve, the
back flow preventer discharge port, and the domestic hot water tank temperature and pressure relief valve. Any
other reliefs, such as from radiant heating systems, must also follow these guidelines.

Ascent Combi and Ascent Plus Combi Gas – January 2024 7
ASCENT AND ASCENT PLUS COMBI BOILERS
IMPORTANT MESSAGE TO HOMEOWNER/USER: These instructions should be carefully read and kept for future
reference to gain the best performance from your Ascent boiler.
CONGRATULATIONS ON YOUR PURCHASE OF THE ASCENT BOILER with its highly efficient low mass hydronic
heat exchanger, the Energy Converter. It is the product of years of engineering and advanced design, which brings
together in a single system all elements needed to provide efficient home heat and hot water. This operation and
maintenance information has been prepared so that you may better understand and use your Energy Kinetics Ascent
Combi Boiler and Heating System.
PRINCIPLE OF OPERATION
The Ascent Combi Boiler comprises a heat source, the energy converter, circulating water, and an on demand
domestic hot water plate heat exchanger. The Ascent Plus Combi Boiler additionally includes an expanded heat transfer
surface and extended flue pass with a power venter that uses dilution air to allow polypropylene venting.
The Boiler maintains a minimum temperature (in stock configuration, see “advanced settings”) until a heating zone or
zone controller (supplied by Energy Kinetics or sourced locally) signals a call for heat, or the domestic water flow switch
signals hot water flow in excess of about ½ GPM. The Ascent Hydrostat control receives the call for heat or hot water and
turns on the heat and/or hot water/bypass circulators, and turns on the burner if the boiler is not hot enough to satisfy the
demand.
The Ascent Converter is the product of advanced thermal engineering. It is designed with two separate passageways,
coiled around each other. Water travels along one passageway from your home toward the center of the unit and heated
gases travel from the unit center toward the vent. This is a “forced circulation counter-flow” design and it provides very
efficient transfer of heat from the burning fuel to the circulating water. The superior insulation of the boiler minimizes heat
losses to the surroundings, resulting in directing heat to your home in an efficient and quiet manner.
The Ascent Combi and Ascent Plus Combi have high annual efficiency because they are very well insulated low
mass designs with a moderate amount of water so excess heat is not wasted as is commonly found in cast iron and steel
boilers. They are also designed to produce domestic hot water at much lower temperatures than those required in tankless
coil boilers, allowing significantly lower idle temperatures and lower heat loss in standby mode.
Your Ascent boiler begins to supply heat and hot water almost instantly. This rapid response means that your rooms
can be heated quickly to temperature. The Ascent can heat water with up to 175,000 BTU/hr (150,000 BTU/hr for the
Ascent Plus Combi) input, enough for two simultaneous showers in a typical house with standard flow fixtures. With the
factory installed backflush and cleaning ports, the boiler and plate heat exchanger may be easily serviced to keep peak hot
water production for the life of the system.
The Ascent Boiler is designed with a hinged front cover that allows full access to the inside of the boiler for inspection
and cleaning. All access for pressure vessel service is from the front, so the boiler can be placed near a wall or into a
closet.

Ascent Combi and Ascent Plus Combi Gas – January 2024 8
TIP:
RECEIVING and UNPACKING
Inspect shipment upon receipt for external damage. Walk
around the freight and identify and address any unusual signs of
handling with the shipper before signing for the delivery. This is
a fast and easy way to resolve all transportation damage claims.
When unpacking and uncrating, inspect each item for internal
damage. Any damage found should immediately be reported to the freight
carrier before installation. The receiver is responsible for following the claims
procedure of the freight carrier. The freight carrier is responsible for taking
prompt action on all claims. Replacements for parts damaged in shipment are
available upon receipt of a signed copy of a claim report (concealed damage
claims should be filed immediately against the freight carrier by the consignee).
After unpacking, check each item against the packing list. Inspect it
thoroughly for loose parts, instruction sheets and packing lists. Immediately
report any missing items. It is wise to complete the installation before discarding
packing material. Store all parts where they will not be damaged or lost prior to
installation.
LOCATION and CLEARANCE
DANGER: Provide clearance to combustible surfaces in accordance with all local and national codes. Follow National
Fire Protection Association Bulletin NFPA No. 54: National Fuel Gas Code and all applicable codes.
Installation Clearances from Boiler Surfaces, Inches Clearance to
Combustibles
RECOMMENDED
Clearance for Service
Front of boiler (not including burner)* 10” 20”
Left side of boiler body 0 5”
Right side of boiler body 0 12”
Back of boiler body 4” 4”
Top of boiler body 10” 16”
Bottom of boiler legs to floor 0 0
Ascent Combi B-Vent/L-Vent: from flue pipe “A” 1” / 3” 1” / 3”
Ascent Combi Standard Flue: from flue pipe “B” 9” 9”
Ascent Plus Combi Polypropylene “C”
0” 0”
* Minimum recommended clearance to allow door to fully open.
Ascent Combi Ascent Plus
Combi
Weight 377 lbs 405 lbs
Water Content 3 gallons 3 gallons
Air Inlet Pipe Size 2" PVC 3" PVC
Boiler Flue Outlet 5" Flue Pipe 3"
Polypropylene
A = L-Vent/ B-Vent
B = Standard Vent
C = Polypropylene Vent
(Ascent Plus Combi only)
Ascent Combi Ascent Plus Combi
Figure 1A, Top View of Boiler
Flue Connection Clearance to Combustibles
7/8”
B
7
”
A
C

Ascent Combi and Ascent Plus Combi Gas – January 2024 9
Installations should utilize the Energy Kinetics boiler stand or a suitable solid, stable, level, and smooth foundation for the
boiler. If not using an Energy Kinetics supplied stand, provide a solid, level, and smooth foundation with clearance for door
opening and service. Place the unit as near to the chimney or vent as possible allowing clearance for front cleaning and
service as shown in Figure 1A and 1B. Installing the boiler with the burner parallel to a wall is sometimes advisable to allow
access to front and rear components in spaces with limited depth.
NOTICE: The Ascent Combi is manufactured with the BACK of the boiler higher than the front to assist in air removal. A
spirit level placed front to back on the lower side of the base near the floor will read level. The stand design compensates
and properly pitches the boiler ¼ to ½ a bubble off level, with the back of the boiler higher. Adjust the levelling feet or by
shimming the base at the floor as necessary.
Figure 1B - Boiler Clearance for Cleaning and Service
Burner
Dim “A” Open Door
Leg Bottom to Floor
Clearance “B” (minimum)
W/O Silent
Burner Cover
With Silent
Burner Cover
Carlin
EZ-Gas 11 5/8” 12 ¾” 12”
COMBUSTION AIR
The Ascent Combi Boiler must be installed in an area where adequate fresh air is available to support combustion. An
optional sealed air box (Silent Burner Cover), included in the Ascent Plus Combi model allows combustion air to be piped
from outside the building. Piping of outside air directly to the boiler is highly recommended because it isolates the boiler
from the home environment, it greatly reduces operating noise from the boiler, and it can lower idle loss in some cases.
Boiler with outside air piping: Combustion air must be supplied for the Ascent Plus Combi, although it is optional for
the Ascent Combi. In modern houses with tight construction, the connection of the Silent Burner Cover to an outside air
source to provide combustion air is highly recommended on the Ascent Combi. The outside air source should be located
high enough above grade to be at least 12” above expected snow accumulation.
WARNING: Combustion air must be supplied for the Ascent Plus Combi, although it is optional for the Ascent Combi. It
may be supplied with up to 50 feet in equivalent length through polypropylene or PVC pipe. For the EK1T
Ascent Combi use 2" pipe, and for the EK1T+ Ascent Plus Combi use 3” pipe. Each 90 degree elbow is the
equivalent of 5 feet of straight pipe. For example, if three 90 degree elbows are used, then the length of pipe
run may be up to 35 feet. For longer runs up to 65 equivalent feet increase pipe size by 1","(to 3” for the
Ascent Combi and to 4” for the Ascent Plus Combi). A Tek-screwed or un-cemented joint allows the air inlet
pipe to be disconnected so the swing down door may open.
Level bottom of stand,
or slightly higher in back
20" 49-1/ 2"
30-1/2"
"A"
48"
52 1
4"
"B"

Ascent Combi and Ascent Plus Combi Gas – January 2024 10
WARNING: Modern buildings of tight construction, as well as the operation of attic and exhaust fans, kitchen ventilation
systems, clothes dryers or fireplaces may create conditions of unsatisfactory combustion or venting.
Provisions must be made to use combustion air that communicates with a well-ventilated attic or with the
outdoors (such as using a louver or grate). The opening should have a free area of not less than one (1)
square inch per 4,000 BTU per hour of the total input rating.
Boiler without outside air piping:
WARNING: The confined space shall be provided with two permanent openings, one near the top of the
enclosure and one near the bottom. Each opening shall have a free area of not less than one square
inch per 1,000 BTU per hour of the total input rating of all appliances in the enclosure, freely
communicating with interior areas having adequate infiltration from the outside.
CONVENTIONAL CHIMNEY VENTING – EK1T ASCENT COMBI ONLY
DANGER: Improper chimney installation or operation may cause flue gas leakage and/or carbon monoxide leakage,
which may lead to severe injury or death.
When connecting an Energy Kinetics EK1T Ascent Combi boiler to an existing chimney, be sure to follow all applicable
local, state, and national codes that may differ from this manual, and in accordance with the following codes, as applicable:
ANSI Z223.1/NFPA No. 54: National Fuel Gas Code
In retrofit installations, have the chimney thoroughly cleaned. Carefully inspect the chimney, base of chimney, and liner
prior to installation of the Ascent Combi Boiler.
WARNING: Masonry chimneys must have a tile or metal liner. The liner must:
1) Extend above the masonry.
2) Have an insulating air gap, isolating the liner from the chimney, allowing for rapid heat-up and draft
establishment.
3) Be sealed at each joint to prevent air infiltration and damage from condensation.
NOTICE: Inspect Chimney and Chimney base after initial three months of heating season.
The installation of a chimney cap is recommended. The base of the chimney must always have a drop leg below the
flue connector to allow scale and condensation to accumulate without blocking the flue pipe. Do not block the flue opening
by inserting the flue connecter too deeply into the chimney.
Best Practice: If drop leg is in excess of 12 inches deep, backfill with loose gravel or sand to obtain a maximum of 12-inch
depth. Use of fiberglass insulation to backfill the drop leg is also a practical method. All clean out doors should be closed,
and if practical also sealed with silicone, to prevent cold air entry into chimney. Clean out doors that are sealed with
silicone can still be opened every tune up to inspect and clean the drop leg, and then resealed with silicone for another
year. Pay particular attention to cleanout doors that are located out of doors.
CAUTION: If chimney liner is not sound or if existing tile liner fails to contain intermittent condensation, or if excessive
debris is found at the base of the chimney, then it is recommended to install a properly sized metal liner approved for use
with gas heat appliances.
The metal liner diameter and length should be as recommended by the metal liner manufacturer. Corrugated metal
liners should be at least 5”diameter for EK1T Ascent Combi (a 6” diameter chimney liner may be required at 1.25 GPH firing
rate). Energy Kinetics has 5” flexible metal chimney connectors available to be used between the boiler flue collar and the
chimney. Call Energy Kinetics for details on metal liners.
Chimney connectors should be positioned to create the shortest possible run of flue pipe to the chimney. If a 6”
diameter chimney liner is used, it is recommended that the chimney connector be 6” diameter too by using a short piece of
5” to 6” adapter at the flue outlet. The overall horizontal length of flue piping should not exceed 15 feet. Long runs or low
firing rates may require insulated flue pipe such as B-Vent, L-Vent or All-Fuels to keep the temperature at base of chimney
adequate for draft and to prevent corrosion of piping and connectors.
Because the Ascent Combi boiler uses a power burner, the flue pipe may experience some positive pressure on start
up. Energy Kinetics recommends that all pipe joints be sealed with high temperature silicone sealant to ensure passage of
all combustion products to the chimney.
Normally, pitch horizontal flue pipe up toward chimney approximately ¼” per foot. For existing installations, it is
permissible for the flue connection of the boiler to be higher than the chimney thimble, provided adequate draft is
established.
If a minimum of -0.02” w.c. draft at the breech is not present after sufficient burner run time to heat up the chimney,
there is a problem that will need to be corrected. Call Energy Kinetics for help resolving draft problems. Under normal
circumstances, there is NO need for a DRAFT REGULATOR and one should not be installed. Call Energy Kinetics with
questions about flue pipe sizing.
WARNING: No solid fuel appliance or fireplace should be installed in a flue common with this heating appliance. The flue
gas exit of the venting system must be at least three (3) feet above the point at which it passes through the roof and at least
two (2) feet higher than any portion of a building within 10 feet horizontally of its location.

Ascent Combi and Ascent Plus Combi Gas – January 2024 11
L-VENT CHIMNEY – EK1T ASCENT COMBI ONLY
Ascent Combi Boilers typically have flue gas temperatures between 350°F and 450°F during normal operation. Due to
the low flue gas temperatures, L-Vent chimney pipe is suitable for use with Ascent Combi Boilers. L-Vent chimney pipe
may allow smaller chase dimensions than other chimney pipe materials and should be considered for new installations with
Ascent Combi Boilers.
1. L-Vent must be U.L. Listed to U.L. 641.
2. L-Vent to be installed in accordance with the vent manufacturer’s instructions.
3. Ascent Combi and L-Vent must be installed in strict compliance with all State and Local Codes and with the regulations
of the authorities having jurisdiction, which may differ from and which take precedence over these instructions or the
vent manufacturer’s instructions.
4. The maximum temperature rating for L-Vent is 570°F.
B-VENT CHIMNEY – EK1T ASCENT COMBI ONLY
Ascent Combi Boilers typically have flue gas temperatures between 350°F and 450°F during normal operation, but may
have higher stack temperatures when fired over 150,000 BTU/hr input; when fired over 150,000 BTU/hr input, Ascent
Combi Boilers must use Class A venting clearance to combustibles (9”). B-Vent chimney pipe may allow smaller chase
dimensions than other chimney pipe materials and should be considered for new installations with Ascent Combi Boilers.
1. B-Vent must be U.L. Listed to U.L. 441.
2. B-Vent to be installed in accordance with the vent manufacturer’s instructions.
3. Ascent Combi and B-Vent must be installed in strict compliance with all State and Local Codes and with the regulations
of the authorities having jurisdiction, which may differ from and which take precedence over these instructions or the
vent manufacturer’s instructions.
4. B-Vent is rated for gas-fired boilers ONLY and cannot be converted to oil-fired.
5. The maximum temperature rating for B-Vent is 480°F.
WARNING: Ascent Combi Boilers are rated for B-Vent to a maximum firing rate of 150,000 BTU/hr input. Higher
firing rates shall utilize Class A clearance to combustibles (9”).
POLYPROPYLENE VENTING – EK1T+ ASCENT PLUS COMBI ONLY
See supplemental “Smart Vent” installation manual for Ascent Plus Combi Only.
The Ascent Plus Combi ships with an integrated dilution-air power venter which results in positive pressure, near-
condensing flue gas. It must only be vented with Class IV venting products as outlined in the supplemental manual and
must not be vented with conventional chimney products. A total equivalent length of 50 feet of 3” polypropylene is allowed.
Subtract 5 feet from the maximum length for each elbow added. Snorkel assemblies must be included in the total
allowance for venting and intake lengths and elbows allowance calculation.
WARNING: Sidewall venting and combustion air piping from outside the building is required. The Energy Kinetics
Smart Vent kit contains specific instructions for installation that must be followed. For length of run for intake air and for the
vent connection, refer to the Smart Vent with Dilution Air installation manual. Combustion air may be supplied through PVC
pipe. An unglued or Tek-screw joint allows the door to swing down when the air inlet pipe is disconnected.

Ascent Combi and Ascent Plus Combi Gas – January 2024 12
GAS BURNER SETTINGS
Ascent Boilers are shipped from the factory preset for 150,000 Btu/hr firing rate. The Ascent Boiler can be fired over a
range of firing rates to suit the needs of the application. The following table lists approximate settings for Carlin EZ-Gas
burners based on extensive testing.
CAUTION: Final settings for each burner and firing rate for a particular installation must be determined by using
combustion test equipment and following the instructions given under "Start Up Procedure".
CAUTION: Because the energy converter removes heat from the combustion flue gas so efficiently, low firing rates may
not provide high enough flue gas temperature for proper draft in a chimney with the Ascent Combi. The Columns labeled
'Chimney' and 'Sidewall' show the suitability of the firing rate for a particular combination.
Input
Btu/Hr
Burner Orifice
Drill size
Ascent
Approximate air
band setting
Ascent Plus
Approximate air
band setting
UTL - air tube
insertion length
Diffuser
Natural Gas Propane Gas 1 Slot 2 Slot 1 Slot inches
100,000 #1 (0.228) #16 (0.177) 35 40 2-3/8” B
120,000 C (0.242) #13 (0.189) 45 55 2-3/8" B
150,000* J (0.277) 7/32 (0.219) 60 87 2-3/8" B
(175,000) N (0.302) C (0.0242) 100 40 N/A 2-3/8” B
* Factory Setting for Ascent and Ascent Plus Boilers
( ) 175,000 Btu/Hr input for Ascent only, not allowed for the Ascent Plus
GAS PIPING SYSTEMS
The boiler and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure
testing of the gas supply piping system at test pressures in excess of 1/2 psi (3.5 kPa, 14 in wc).
The boiler must be isolated from the gas supply piping system by closing its individual manual shutoff valve during any
pressure testing of the gas piping system at test pressures equal to or less than 1/2 psi (3.5 kPa, 14 in wc).
A manual shut off valve and a sediment trap must be provided in the gas piping upstream of the electric combination
gas valve at the boiler. The boiler and its gas connection must be tested for gas leakage before placing the boiler in
operation.
Gas piping must be properly sized in accordance with the National Fuel Gas Code, ANSI Z223.1/NFPA 54, or
according to state and local codes as applicable. Gas piping must be sized to provide the maximum firing rate gas flow for
all appliances in the building. For Natural Gas installations, be sure to verify that the gas meter is properly sized for all
appliances. Do not use any service 90o elbows. Use only full port shutoff valves. If in doubt, oversize the piping.
The following tables provide suggested sizing for Black Iron Pipe. Be sure to add the appropriate equivalent
length for every fitting and elbow used. For other types of pipe or tubing, consult NFPA 54 or the manufacturer
of the pipe or tubing or your gas supplier for pipe sizing information.
For Propane Gas, drawing up to 175,000 Btu/hr (70 Cubic Feet per Hour).
For Natural Gas, drawing up to 175,000 Btu/hr (175 Cubic Feet per Hour).
Natural Gas Propane Gas
Iron Pipe Size Maximum Equivalent
Length
Iron Pipe Size Maximum
Equivalent Length
3/4 inches 20 feet 3/4 inches 90 feet
1 inch 70 feet 1 inch 200 feet
1-1/4 inches 200 feet 1-1/4 inches 200 feet
Inlet & Outlet on Valve
Manual Shutoff Valve
Height of Shutoff Valve above ground
level to conform to any local codes.
Union
Sediment Trap/Drip Leg
3" Min
Check for gas leaks, using a gas
detector or applying a leak detection
solution to any connections.
Direction of flow
Gas
Valve
Test Gauge Port -Inlet 1/8"NPT
Inlet Pressure 5" W.C. Min.
Test Gauge Port -Outlet 1/8" NPT

Ascent Combi and Ascent Plus Combi Gas – January 2024 13
GENERAL ASSEMBLY
Assembly of various packaged units is illustrated in figure 2A and 2B as well as throughout this manual. The use of non-
Energy Kinetics supplied pump, controls and accessories should follow good practices. The diagrams and locations
presented in the manual are recommended.
Ascent Combi EK1T
For Conventional Venting
Ascent Plus Combi EK1T+
For Polypropylene Venting
Air Vent and T&P Gauge
(behind inducer on the Plus)
Inducer, Outlet accepts 3” Polypropylene
Vent Pipe. Vent pipe installs without the
need for a se
p
arate a
pp
liance ada
p
tor
Ascent Hydrostat
#18 Plate Heat Exchan
g
er
Mix Valve
ASSE 1017 Compliant
Boiler B
yp
ass Strainer/Drain
Domestic Clean-in-place
Fittings. (Optional)
Domestic/Boiler Bypass
Circulator
Figure 2A
Domestic Flow Switch

Ascent Combi and Ascent Plus Combi Gas – January 2024 14
FIGURE 2B – BOILER FEED and EXPANSION TANK LOCATION
PIPING
All piping and accessory connections should follow good practice using approved joint sealants.
Figure 2C indicates a typical flow schematic for boiler water feeding multiple zones. Each system will vary according to job
location.
Supply and return connections are 1”NPT on Ascent boilers.
Call Energy Kinetics to obtain piping and wiring instructions for alternate applications, such as hydronic heating, radiant
heating, domestic hot water, swimming pool heating, multiple boilers, injection loops, etc.
Figures 2C and 2D indicate general system piping arrangement and options. Piping of individual systems may vary from
figures.
Some site specific heating zone piping configurations may allow heat migration, in which case a flow check(s) may be
installed to prevent the gravity flow of heat.
FEEDWATER
CONNECTION
EXPANSION TANK TO
BE LOCATED IN
RETURN PIPING
ITEMS INSIDE PHANTOM BOX
NOT INCLUDED WITH SYSTEM
OPTIONAL TRIM KIT INCLUDES:
EXP TANK & FEEDER/PREVENTER
OPTIONAL PREMIER KIT INCLUDES:
FEEDER/PREVENTER
FIGURE 2B

Ascent Combi and Ascent Plus Combi Gas – January 2024 15
Figure 2C
Zoning with Zone Valves
Use Energy Kinetics
Smart Thread Sealant
P/N 10-0620
Figure 2D
Zoning with Circulators

Ascent Combi and Ascent Plus Combi Gas – January 2024 16
ZONE CONTROL
ZONE CONTROL BY VALVE: Heating zones controlled by zone valves will require a separate power supply for the
valve(s) with end switch(s) to complete the call for heat to the Ascent Hydrostat control. A multi zone valve panel (EK P/N:
10-1216, ZVC404 or equivalent) may also be used; follow the instruction manual found with the control. The control will
need an end switch to connect to TT on the Ascent Hydrostat control to complete the call for heat.
R W C
ZONE 4
ZONE 4
1 2 3 4
ZONE 4
PRIORITY
OFF
ON
ZVC 404-4
Four Zone
Zone Valve Control
24
VAC
N/O COM N/C
ZON E 4 PUMP
MOTOR EN D
SWITC H
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
T STAT 4 VALVE 4
POWER
Fac tory
Installed
Trans former
Black (Hot)
Whi te (Neutr al )
2 Wire Zone Valve
(Power Open, Self Closing,
No End Switch)
Must Use Jumper
PRIORTY
R W C
ZONE 3
R W C
ZONE 2
R W C
ZONE 1
THERMOSTAT S ( 24VAC)
X X
ISOLATED
END SWITCH
END SWITCH
ZONE 3
1 2 3 4
ZONE 2
1 2 3 4
ZONE 1
1 2 3 4
PRIORTY
24 VAC ZONE VALVES
XX
PU MP EN D
SWIT C H
LED
INDICATORS
JUMPER
3 & 4
4 Wire Zone Valve
( Power Open, Sel f Closing)
HYDROSTAT CONTROL
LWCO/LIMIT
TT
M
MOTOR END
SWI TC H
M
MOTOR
M
JUMPER
3 & 4
MOTOR
M
2 Wire Zone Valve
( Power Open, Sel f Cl osing,
No End Switch)
Must Use Jumper
4 Wire Zone Valve
(Power Open, Self Closing)
Using a Taco Zone Valve Control
Using Zone Valves w/Endswitches

Ascent Combi and Ascent Plus Combi Gas – January 2024 17
ZONE CONTROL BY CIRCULATOR: Zone control by circulators requires a circulator relay with end switch (EK P/N: 10-
0464-4, SR504 or equivalent) or individual relays (EK P/N: 10-0464, SR501 or equivalent) for each zone. The boiler
bypass circulator is still used in this case. NOTICE: An additional tee must be installed into the supply for each additional
circulator. The tee is the supply connection for any zone circulators with the returns for these zones connected to the boiler
return. See Figure 2D “Zoning with Circulators” diagram found in this manual.
ZONE PURGING: Valves to isolate and purge individual zones should be installed according to good piping practices.
EXPANSION TANK SIZING: The type and size of expansion tank depends on the total system water volume. The EK1T
Ascent Combi and the EK1T+ Ascent Plus Combi contain 3 gallons of water. NOTICE: Sizing must consider cold start
and hot operation due to system cold start and rapid heat up. Note: Optional trim package, EK P/N:10-1702 includes a
#30 Amtrol expansion tank.
BOILER BYPASS CIRCULATOR
NOTICE: Systems are piped at the factory with the plate heat exchanger mounting installed with a boiler
bypass circulator. This zone must have all valves open for the boiler to operate properly.
The boiler bypass circulator is required for proper operation in both the space heating and domestic hot water
production cycles. In a space heating cycle, the bypass circulator provides integrated condensing protection. In a domestic
hot water production cycle, the bypass circulator provides forced circulation to the plate heat exchanger to allow rapid and
efficient heat transfer to the domestic water. NOTICE: Heat Only systems come from the factory with “bypass” piping
installed in place of the plate heat exchanger to provide the required flow through the bypass circuit.
FILLING WITH WATER, VENTING, and PURGING
When piping is completed and all accessories are installed on the Converter, the system should be filled with water.
The Converter purges itself of air when properly installed. Purge all zones and heating circulators. NOTICE: CALEFFI AIR
VENT CAP CORRECT POSITION IS CLOSED; REMOVE CAP FOR PURGING AND REINSTALL IN THE FULLY
CLOSED POSITION WHEN PUT INTO SERVICE (other air vent caps must be in the OPEN position when put into
service). Each zone should be purged until a steady stream of water without air passes out of the purge hose. Vent all
radiation.

Ascent Combi and Ascent Plus Combi Gas – January 2024 18
NOTICE: DO NOT START BURNER UNTIL CONVERTER AND SYSTEM ARE FULL OF WATER. Fill to normal cold
system pressure, 10 to 12 psi on pressure gauge. Before placing system in operation, carefully check for leaks throughout
system. Tighten pipe joints, circulator flanges; check gaskets, etc., as needed.
BOILER WATER TREATMENT
Addition of boiler water treatment is recommended to reduce lime and mineral buildup inside the boiler. Energy Kinetics
recommends addition of one quart of 8-Way Boiler Treatment per 30 gallons system water. 8-Way Boiler Treatment is
recommended to treat water up to medium hardness. 8-Way Boiler Treatment contains pH buffering agents that are color
activated. Treated water will appear blue-purple with the color fading as the buffering/neutralizing capabilities of the
treatment are depleted. Adding additional 8-Way Boiler Treatment as required as part of scheduled maintenance will
ensure the boiler and heating system is continually protected from scale and corrosion. Call Energy Kinetics for more
details about boiler water treatment and about hard water conditions.
ANTI-FREEZE
Only non-toxic antifreeze (such as Propylene Glycol) should be used if adding anti-freeze to a system that produces
domestic hot water. Hard water should not be used in combination with generic antifreeze. Energy Kinetics supplies a
quality inhibited Propylene Glycol anti-freeze with orange dye and an antifoam agent. 8-Way Boiler Treatment can be
added to Energy Kinetics anti-freeze and is recommended in areas of medium water hardness. NOTICE: Thoroughly
clean system prior to adding antifreeze. TSP (Tri-Sodium Phosphate) is recommended for removing flux and other oil
based compounds (where allowed by local regulations). Once system has been cleaned and flushed, then add antifreeze
to obtain approximately a 30% by volume mixture of antifreeze in water. Call Energy Kinetics for assistance in calculating
how much anti-freeze to add to system.
WINTERIZING
NOTICE: If the Ascent Combi and Ascent Plus Combi Boilers may be exposed to freezing temperatures, such as a
vacation home shut down for the winter, then anti-freeze should be added. When a home is winterized by draining all
domestic water piping, then the Ascent Combi and Ascent Plus Combi Boilers must be protected. It is not recommended to
drain the boiler, because introducing air into the boiler can cause rusting inside the boiler shell and also because the
Energy Converter has a spiral water passage that cannot be completely drained of water. When draining the domestic
water piping system, be sure to drain the domestic side of the plate heat exchanger. If the hydronic system will not be
drained, then add enough anti-freeze to protect the entire hydronic system including the boiler, piping, radiation, circulators,
etc. If the hydronic system will be drained, then add shut off valves to isolate the boiler and add anti-freeze to the boiler
only, as follows. Drain water from the boiler and then add anti-freeze to the boiler. Refill boiler with water and run boiler
circulator through the bypass to distribute antifreeze within boiler. Propylene Glycol in water will provide the following
freeze protection: 30% down to +8F, 40% to -8F, 50% to -27F. Energy Kinetics recommends using 30% anti-freeze to
obtain the best boiler performance. Use over 30% anti-freeze only if lower temperature freeze protection is mandatory.
Caution: Always keep the fuel supply valve shutoff if the burner is shut down for an extended period of time.

Ascent Combi and Ascent Plus Combi Gas – January 2024 19
LINE VOLTAGE WIRING DIAGRAMS
Figure 3A – Ascent Combi
All wiring installations in the United States
must comply with the NEC, and any local
codes.
C2 C1
HYDROSTAT CONTROL
LWCO/LIMIT
L1 L2 ZC ZRB1 B2
TT
Heat Cal l
Flow Switch
L1 L2
(24VAC)
WHITE
BLACK
I
Z
HW Circ
Heat Circ
GND
Fi el d Wi red Power
GREEN
Li mi t ( Black)
Neutral (White)
Power ( Red)
Door Swi tch
System Emergency
Switch/Junction Box
To Bur ner
Heat Circ
ZR Relay
HW Circ
(Neutr al )
White
Black
(Hot)
B1 Relay
Burner
C1 Relay
Heat Circ
HW Circ
HydroStat
Voltag e
Line
C1
L1 L2
B1
ZC
ZR
Switch
HW Flow
System
Emergency
Switch
Green
(Ground)
Transformer
M
Igniter
Burner
Mo t o r
Ga s
Val v e
24 V
Y
W
EK1T ASCENT
GAS FIRED
Y
Carl i n Ai r
Prover
Gn
Burner Door
Switch
Burner Relay
R/W
Bk W
Bl
V
Or
BV
Blocked Vent
Puff Switch