H2O HC Series User manual

D-VAC Sales Inc.
MASSAPEQUA, NY
EMAIL: [email protected] TEL: [phone]
HC Series
Gas-Fired Stainless Steel Boilers and Water Heaters
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
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 a neighbor’s phone. Follow
the gas supplier’s instruction.
If you cannot reach your gas
supplier, call the fire department.
Installation and service must be
performed by a qualified installer, service
agency or the gas supplier.
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.
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HC SERIES GENERAL SPECIFICATIONS
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H2O BOILER HC SERIES IOM Manual
WARNING: Fire or Explosion Hazard
Improper configuration can cause fuel buildup and
explosion. Improper user operation may result in
property loss, severe physical injury, or death.
Any changes to safety-related configuration
parameters must only be done by experienced
and/or licensed burner/boiler operators and
mechanics. If any odor of gas is detected, or if the
gas burner does not appear to be functioning in a
normal manner, close the main gas shutoff valve
.
Do not shut off the power switch. Contact your
heating contractor, gas company, or factory
representative.
WARNING: Carbon Monoxide Hazard
Improper adjustment of the burners may lead to
poor combustion quality, increasing the amount of
carbon monoxide produced. Excessive carbon
monoxide levels may lead to personal injury or
death.
WARNING: Electrical Shock Hazard
Electrical shock can cause severe injury, death or
property damage. Disconnect the power supply
before beginning installation or changing the
wiring to prevent electrical shock or damage to
the equipment. It may be necessary to turn off
more than one power supply disconnect. All
electrical wiring is to be done in accordance with
local codes, or in the absence of local codes, with:
1) The National Electrical Code ANSI/NFPA No.
70 - latest Edition, or 2) CSA STD. C22.1
“Canadian Electrical Code - Part 1.” This
appliance must be electrically grounded in
accordance with these codes.
Note: This product must be installed and serviced by a professional service technician,
qualified in hot water boiler and heater installation and maintenance. Improper installation
and/or operation could create carbon monoxide gas in flue gases which could cause serious
injury, property damage, or death. Improper installation and/or operation will void the
warranty.
Warning: For proper operation of a spa or hot tub the following safety rules should be observed:

Spa or hot tub water temperature should never exceed 104º F (40º C). A temperature of
100º F (38º C) is considered safe for an adult. Special caution is suggested for young
children.

Drinking alcoholic beverages before or during hot tub or spa use can cause drowsiness,
which could lead to unconsciousness and subsequently resulting in drowning.

Pregnant women should be cautious. Soaking in water above 102º F (39º C) can cause
fetal damage during the first three months of pregnancy. Pregnant women should respect
the 100º F (38º C) maximum rule.

Before entering the spa or hot tub, the water temperature should be checked with an
accurate thermometer. Spa or hot tub thermostats may have an inaccuracy, as high as 4º
F in regulating the water temperature.

Persons with medical history of heart disease, circulatory problems, diabetes or blood
pressure should obtain their physician’s advice before using spas or hot tubs.
Persons taking medications, which induce drowsiness, should not use spas or hot tubs.
Note: The installation must conform with one or more of the following, as applicable:
1) Local codes or, in the absence of local codes,
2)
The National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or CSA B149.1, Natural
Gas and Propane Installation Code.
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HC SERIES GENERAL SPECIFICATIONS
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H2O BOILER SERIES IOM Manual
Warning:
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.
Warning:
Do not bypass any of the instruments in the safety loop. Doing so may cause
serious damage to the unit and its surroundings.
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HC SERIES GENERAL SPECIFICATIONS
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H2O BOILER HC SERIES IOM Manual
Table of Contents
HC SERIES GENERAL SPECIFICATIONS................................................................................................................vii
HC SERIES GENERAL LAYOUT & DIMENSIONS.................................................................................................viii
SECTION 1: INTRODUCTION...................................................................................................................................... 1
1.1 Boiler/Water Heater Heat Exchanger.............................................................................................................. 2
1.2 Control System................................................................................................................................................ 3
1.3 Safety Features................................................................................................................................................ 3
1.4 Gas Lines ........................................................................................................................................................ 5
1.4.1 Pilot Gas Line............................................................................................................................................. 5
1.4.2 Main Gas Line ............................................................................................................................................ 5
1.4.3 Gas Manifold and Control Assembly Tests................................................................................................ 6
1.4.4 Code Compliance ....................................................................................................................................... 6
1.5 Freeze Protection and Storage......................................................................................................................... 7
1.6 Water Treatment ............................................................................................................................................. 7
SECTION 2: INSTALLATION....................................................................................................................................... 8
2.1 Water Heater/ Boiler Package......................................................................................................................... 9
2.2 Removal of Existing Boiler........................................................................................................................... 10
2.3 Clearance from Combustible Material.......................................................................................................... 11
2.4 Location ........................................................................................................................................................ 12
2.5 Relief Valve piping....................................................................................................................................... 13
2.6 Water Connection ......................................................................................................................................... 13
2.6.1 Potable water heater connection ............................................................................................................... 14
2.6.2 Piping Arrangement............................................................................................................................... 14
2.7 Condensate Line............................................................................................................................................ 17
2.8 Gas Line Connections................................................................................................................................... 17
2.9 Electrical connection..................................................................................................................................... 18
2.10 Vent Connection ........................................................................................................................................... 18
2.10.1 Suggested Single wall Vent system...................................................................................................... 19
2.10.2 Vent Sizing........................................................................................................................................... 22
2.11 General Instructions...................................................................................................................................... 23
SECTION 3: OPERATION ........................................................................................................................................... 25
3.1 Sequence of Operation.................................................................................................................................. 26
3.1.1 Safety Loop .............................................................................................................................................. 26
3.1.2 Pre-Purge.................................................................................................................................................. 26
3.1.3 Pilot Flame................................................................................................................................................ 27
3.1.4 Main Flame............................................................................................................................................... 27
3.1.5 Continuous Operation............................................................................................................................... 28
3.2 PRE-COMMISSIONING ............................................................................................................................. 29
3.3 Commissioning ............................................................................................................................................. 30
3.4 Boiler Capacity and recovery rate................................................................................................................. 31
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HC SERIES GENERAL SPECIFICATIONS
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H2O BOILER HC SERIES IOM Manual
SECTION 4: MAINTENANCE..................................................................................................................................... 33
4.1 Maintenance Schedule .................................................................................................................................. 34
4.2 General Procedure......................................................................................................................................... 34
4.3 Service Notes ................................................................................................................................................ 36
4.2 Troubleshooting............................................................................................................................................ 37
Technical Data................................................................................................................................................................ 39
Control System Schematic.......................................................................................................................................... 39
Reports........................................................................................................................................................................ 41
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H2O BOILER HC SERIES IOM Manual
HC SERIES GENERAL SPECIFICATIONS
Table 1: HC Series General Specifications
HC 600
HC 1000
HC 1500
HC 2000
HC 2500
Input
BTU/hr
kW
BHP
600,000
176
236
1,000,000
293
393
1,500,000
440
590
2,000,000
586
785
2,500,000
733
983
Output
BTU/hr
kW
BHP
570,000
167
224
950,000
278
373
1,425,000
418
560
1,900,000
557
747
2,375,000
696
933
Boiler Eff. Full load
%
95
95
95
95
95
Electrical Rating
V/Ph/Hz
115/1/60
115/1/60
115/1/60
115/1/60
115/1/60
Heating Surface
Ft2
67
105
172
200
229
Shipping Weight1(approx.)
lbs
550
750
950
1,350
1,500
Water Content
USG
12
17
26
30
34
Minimum Water Flow Rate
USGPM
12
19
24
24
32
Inlet Gas Pressure2
Inches WC
7 - 14
Flue Duct Material
Stainless Steel (air tight, corrosion resistant)
Max Working Pressure
PSIG
160
Max Working Temp.
°F
210
Min Inlet Water Temp.
°F
Any temperature above freezing point
Min Service Clearance
Inches (cm)
Front 24” (61), Top (40), Side 0
1. Dry weight of the unit.
2. Inlet gas pressures are standard values. Refer to submittal drawings for minimum requirements for different configuration.
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HC SERIES GENERAL LAYOUT & DIMENSIONS
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H2O BOILER HC SERIES IOM Manual
HC SERIES GENERAL LAYOUT & DIMENSIONS
Figure 1: General layout of the HC series boilers
Table 2: HC series dimensions
Model
“A” in.
(mm)
“B” in.
(mm)
“C” in.
(mm)
“D” in.
(mm)
“E” in.
(mm)
HC 600
35(890)
40.5(1,030)
20.5(521)
60(1,524)
40.5(1029)
HC 1000
35(890)
40.5(1,030)
26(661)
66(1,676)
40.5(1029)
HC 1500
35(890)
45(1,150)
35.6(905)
75.6(1,920)
40.5(1029)
HC 2000
35(890)
45(1,143)
37.75(959)
81.75(2,076)
40.5(1029)
HC 2500
35(890)
45(1,143)
44(1,118)
86(2,184)
40.5(1029)
Model
ØGas
Inlet “G”
in.
ØWater
Inlet “H”
in.
ØWater
Outlet “I”
in.
ØFlue
Vent “J”
in.
ØWater
Drain “K”
in.
ØCond.
Drain “L”
in.
HC 600
1
2
2
7
¾
¾
HC 1000
1
2
2
9
¾
¾
HC 1500
2
2
2
10
¾
¾
HC 2000
2
3
3
10
¾
¾
HC 2500
2
3
3
12
¾
¾
Note: Depth of the unit may vary
depending on the burner selected.
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SECTION 1: INTRODUCTION
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H2O BOILER HC SERIES IOM Manual
SECTION 1: INTRODUCTION
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SECTION 1: INTRODUCTION
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H2O BOILER SERIES IOM Manual
1.1 Boiler/Water Heater Heat Exchanger
The H2O HC series is a gas-fired water tube boiler and water heater with nominal input
rating ranging from 600,000 to 2,500,000 Btu/hr. Each unit consists of several stainless
steel coiled tubes (SA-249 Type 316L), 1” diameter and 0.049” wall thickness. The coils are
held parallel vertically by means of stainless steel ready rods and adjustment nut assemblies. The
inlets and outlets of the coils are welded to the manifolds pipes of the boiler.
Figure 2: HC Series Boiler
The heat exchanger assembly consists of a ceramic refractory, insulation plate and support ring
prevent hot gas escaping through the rear coil. The front hub and the front coil are connected and
support a high performance gas burner. The weight of the burner is counter balanced by the heat
exchanger.
The exact mechanism of heat exchange is an engineering phenomenon, involving combination of
counter flow, condensation heat recovery, fouling factors, and two-phase conditions. The working
of heat exchanger is a simple process. The gas burner ignites the gas and air mixture inside the
combustion chamber (the central space of the four coils). The hot gas particles cool and condense
as they pass through the gaps of the coils. The flue particles are gathered in the boiler chamber
(space outside the coils and within the liners) and exit through the chimney. The water flows in
the opposite direction of gas. Feed water enters the each coil at the perimeter of the heat
exchanger. The water picks up heat gradually as it circulates through the coil tubes and exits at the
center (near the central hubs). The counter flow design reduces the impact of thermal shock and
increases the heat exchanger life. The flue condensate is drained through a fitting at the bottom
right of the boiler.
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SECTION 1: INTRODUCTION
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H2O BOILER HC SERIES IOM Manual
Figure 3: Patented radial pulse heat exchanger
Boiler’s heat exchanger is designed for flue gas condensation, for ahigher thermal efficiency.
Flue condensation will occur if the temperature of the inlet water is below dew point, usually 120
degrees Fahrenheit. Because the flue condensate is a corrosive element, the internal structure of
the boiler is constructed out of stainless steel 304/316L or better to offer the highest service life.
Corrosion related failures are the typical problems which can be managed through ascheduled
progressive inspection and maintenance program.
1.2 Control System
The boiler/water heater control module consists of an “Individual Boiler/Water Heater Control
Module”, or the “BMS” (Building Management System) signal input module as an option.
With the “Individual Boiler/Water Heater Control Module”, the unit’s operation is governed by the
desired outlet (hot water) temperature. Using adigital, high precision temperature controller, the
owner will identify the required hot water temperature. A temperature sensor installed on the
boiler/water heater outlet manifold continuously measures the outlet water temperature. A
servomotor controlling the gas butterfly valve and the air damper allows for throttling of the
air/gas mixture flowing into the burner. For as long as the set temperature is above that of the
outlet water, the boiler/water heater operates at maximum output capacity.
1.3 Safety Features
Each H2O BOILER HC series boiler and water heater is equipped with a number of safety features.
Low Water Cut Off Switch: One “McDonnell & Miller” low water cut off switch is
installed on the outlet manifold. It prevents the burner from firing when water level drops.
When water reaches the LWCO position, the burner will fire.
Flame Sensor: Every Burner type is equipped with an Ultraviolet flame detector or a
flame probe sensor. This is connected to the burner controller, and is installed inside the
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SECTION 1: INTRODUCTION
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H2O BOILER HC SERIES IOM Manual
burner head. At any time after the main gas valve is opened, if flame is not detected for a
period longer than 4 seconds, the burner controller will be deactivated and the main gas
valve will immediately close.
High Temperature Limit: Each unit is equipped with a “Honeywell” high temperature
limit switch. If outlet water temperature exceeds the temperature set on this switch, switch
will open and the burner controller will be deactivated and the gas valve will immediately
close.
Air Pressure Switches: Every Burner type is equipped with a low air pressure switch is
installed on the air inlet of the blower and measures air pressure entering the burner. If the
combustion air pressure drops by more than 20% below the nominal air pressure (minimum
pressure of 0.4” wc) for any reason such as air inlet obstruction or exhaust obstruction, the
burner controller will be deactivated and the main gas valve will immediately close.
Relief Valve: A safety relief valve with prescribed nominal pipe size of 3/4" to 1 1/4”
valve inlet/outlet, at 150 psig relief pressure, is installed on the water outlet manifold and
supplied as standard equipment. When the boiler or water heater is used in heating
applications having working pressures in the range 40–160 psig, an appropriate pressure
relief valve should be installed.
Gas Pressure Switch: One manual reset low gas pressure switch is installed on the gas
train in between the gas pressure regulator and the first safety shut off valve. If the line
pressure drops below 7” wc, the switch will open and the unit will immediately shut down.
One high gas pressure switch is also installed. If the gas manifold pressure increases above
the pressure on the boiler label, the switch will open and the unit will immediately shut
down. High and Low pressure switches can be also installed directly on the available ports
of the safety shut-off gas valve. Refer to figure 6 for a typical gas train configuration.
Flow Switch: One Flow switch is installed on the outlet manifold. Flow switch has a very
important role. Flow switch is a part of the safety loop, and during normal operation of the
boiler, it will be in close position. When flow rate of the water drops below the minimum
required flow rate, Flow switch will open and stop the burner immediately. When water
flow rate reaches the minimum flow rate for the specific boiler, Flow switch will close up
and burner will automatically restart.
Notes:
Flow switch installation
Additional flow switch is to be installed on the inlet piping of the boiler (by
user).
Flow switch’s paddle length is sized according to the manufacturer’s instruction
for the intended pipe size.
Contact H2O BOILER for installation instruction of the Flow switch.
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SECTION 1: INTRODUCTION
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H2O BOILER HC SERIES IOM Manual
1.4 Gas Lines
1.4.1 Pilot Gas Line
Referring to Figure 5, gas from the main supply line flows at the maximum pressure of 14” wc,
through the manual valve into the pilot line. From the pressure regulator it will then flow through
the safety shut off valves into the burner. The pilot pressure regulator is adjusted such that gas
flows within 2” – 5” wc pressure into the first safety shut off valve. If pilot flame is not
established within 5 seconds of the ignition trial time, the flame safeguard will shut off the pilot
safety gas valve(s).
The pilot flame will ignite the air/gas mixture flowing through the burner within 5 seconds of the
mixture flowing into the burner. In some burner models, a direct ignition system is being used
which eliminates the need for pilot gas train.
Figure 4: Pilot gas train
1.4.2 Main Gas Line
Referring to Figure 6, gas from the main supply line flows at a maximum pressure of 14” wc,
through the manual gas valve into the main gas line. From the pressure regulator it will then flow
through the two safety shut off valves, into the second manual shut off valve. Finally gas flows
through the gas adjustment butterfly valve into the burner where it is ignited by the pilot flame.
The pressure regulator is adjusted such that the manifold gas pressure remains within 0.2 –3.0”
wc. Signals from the temperature controller are sent to the servomotor, which controls the opening
of the butterfly valve and the air damper. Subsequently, the valve and damper are proportionately
closed or opened in order to decrease or increase the air/gas mixture flow into the burner.
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SECTION 1: INTRODUCTION
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H2O BOILER HC SERIES IOM Manual
Figure 5: Main burner gas train
1.4.3 Gas Manifold and Control Assembly Tests
Safe operation and all performance criteria of all H2O BOILER products, incorporating the
installed gas manifold and control assembly, are proven before delivery when the products are
factory tested in accordance with the ANSI Z21.13- CSA 4.9- 2017 standards for Gas-fired hot
water boilers and ANSI Z21.10.3-2015-CSA 4.3-2015 for Gas-fired water heaters, circulating or
instantaneous.
1.4.4 Code Compliance
In Canada, boiler installation must conform to the requirements identified in the CGA Codes
CAN1-B149-1 or CAN1-B149-2 for gas burning appliances, CSA Codes B51 for boiler, pressure
vessel, and pressure piping, and/or all applicable local codes. All electrical connections are to be
made in accordance with the requirements of CSA C22.1, Canadian Electrical Code, Pat 1, and/or
all applicable local codes.
In the United States of America, the installation must conform to the requirements of the authority
having jurisdiction or, in the absence of such requirements, to the National Fuel Gas Code, ANSI
Z223.1-latest edition. All electrical wiring must be carried out in accordance with the National
Electrical Code ANSI/NFPA No.70-latest edition, and any additional state or local
code requirements. If an external power source is used, the unit must be electrically
grounded in accordance with the requirements of the authority having jurisdiction. In the
absence of such authority, the boiler must be electrically grounded in accordance with the
National Electrical Code ANSI/NFPA No. 70-latest edition.
The plumbing and condensate disposal must be carried out in accordance with the local plumbing
codes.
« Cet appareil doit être installé selon les
règlements locaux, ou en l’absence de tells règlements, selon le
National Fuel Gas
Code, ANSI Z223.1/NFPA 54, ou les,
Code d’installation du gaz natural et du
propane, CSA B149.1. »
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H2O BOILER HC SERIES IOM Manual
1.5 Freeze Protection and Storage
In either an open or a closed loop configuration, the boiler must be isolated before draining. Due
to the radial geometry of the unit, it can only be drained by forced air method. The operator can
connect the forced air through the 3/8” air vent on the manifold and the drain connection on the
3/8” connection on the other manifold.
For short term storage, the operator can add antifreeze to protect the boiler against freezing
condition. In this case, the boiler or water heater does not need to be drained. The antifreeze must
be compatible with hydronic heating systems.
1.6 Water Treatment
All heat exchanger coils are constructed from high grade stainless steel. Therefore, high oxygen
content in the feed water should not result in any corrosion inside the coils. Since water flow
through coils is in turbulent mode, and they are continuously expanding and contracting; the
operation of the unit is to a large extent self-cleaning. Therefore, other potential minerals that may
exist in water should not have any adverse effect (on the tubes). However, if it is wished to supply
soft water to the boiler or water heater, then a sodium-based ion-exchanger may be used. Note that
“soft water” is defined as one having less than 0.12British, or 0.17US hardness level. Consult a
local water treatment consultant to determine if water treatment is required.
WARNING:
Exceeding the maximum allowable gas manifold pressure could result
in over-firing of the unit and may cause permanent damage to the unit.
NOTES:
Air and gas flow rates are factory adjusted for optimum combustion
quality. Note that these settings may vary slightly at different site
conditions (calorific value of gas, duct length, elevation, etc.)
After installation is completed, using a gas analyzer, the CO and O2
contents of the exhaust gases should be re-checked to ensure their
compliance with those achieved at the factory and reflected in the test
report provided to your local H2O BOILER representative.
IF adjustments to the factory settings of air and gas flows are made,
ensure that the manifold gas pressure does not exceed the pressure
specified on the boiler label.
NOTES:

Boiler/water heater can be used in both closed loop and open loop (one
pass) operations.

In the commonwealth of Massachusetts the installation shall be carried out
by a licensed gas fitter/plumber and comply with 48CMR
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SECTION 2: INSTALLATION
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H2O BOILER HC SERIES IOM Manual
SECTION 2: INSTALLATION
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SECTION 2: INSTALLATION
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H2O BOILER HC SERIES IOM Manual
2.1 Water Heater/ Boiler Package
Upon the receiving and unpacking of the equipment, check for any sign of damages, hit or dents.
Pay special attention to the gas train parts and safety devices installed. Verify total number of
pieces being shipped with the packing slip. All safety devices will be installed at the factory.
Each unit is supplied with:
Burner/ Blower.
Inlet and outlet manifolds.
High temperature cut off switch with manual reset.
Operating temperature controller.
Pressure relief valve.
Fully assembled gas train.
One Temperature sensor installed on the outlet manifold
Condensates drain kit.
Flame sensor (inside burner).
Flue gas connection.
Pressure-Pressure/temperature gauge.
All Safety features as described in Section 1.3.
Please contact H2O BOILER if items listed above are missing. Please be familiar with major
parts of the boiler before operating. Always exercise caution when transporting.
Instructions provided are only general guides, and are not substitute for common sense and sound
safe practices.
Warning:
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.
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SECTION 2: INSTALLATION
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H2O BOILER HC SERIES IOM Manual
2.2 Removal of Existing Boiler
At the time of removal of an existing boiler, the following steps shall be followed with each
appliance remaining connected to the common venting system placed in operation, while the other
appliances remaining connected to the common venting system are not in operation.
Seal any unused openings in the common venting system.
Visually inspect the venting system for proper size and horizontal pitch and determine
there is no blockage or restriction, leakage, corrosion and other deficiencies which could
cause an unsafe condition.
Insofar as is practical, close all building doors and windows and all doors between the
space in which the appliances remaining connected to the common venting system are
located and other spaces of the building. Turn on clothes dryers and any appliance not
connected to the common venting system. Turn on any exhaust fans, such as range hoods
and bathroom exhausts, so they will operate at maximum speed. Do not operate a
summer exhaust fan. Close fireplace dampers.
Place in operation the appliance being inspected. Follow the lighting instructions. Adjust
thermostat so appliance will operate continuously.
Test for spillage at the draft hood relief opening after 5 minutes of main burner operation.
Use the flame of a match or candle, or smoke from a cigarette, cigar, or pipe.
After it has been determined that each appliance remaining connected to the common
venting system properly vents when tested as outlined above, return doors, windows,
exhaust fans, fireplace dampers, and any other gas-burning appliance to their previous
condition of use.”
Any improper operation of the common venting system should be corrected so the
installation conforms to the National Fuel Gas Code, ANSI Z223.1/NFPA 54, and/or the
Natural Gas and Propane Installation Code, CAN/CSA B149.1. When resizing any
portion of the common venting system, the common venting system should be resized to
approach the minimum size as determined using the appropriate tables in Chapter 13 of
the National Fuel Gas Code, ANSI Z223.1/NFPA 54, and/or the Natural Gas and
Propane Installation Code, CAN/CSA B149.1.
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SECTION 2: INSTALLATION
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H2O BOILER HC SERIES IOM Manual
2.3 Clearance from Combustible Material
Table 3: Clearances from combustible material
MODELS
TOP
FRONT
FLUE
BACK
L, SIDE
R, SIDE
FLOOR
ALL
40”
40”
1”
24”
24”
24”
Non-
Combustible
Note:
Refer to appliance rating plate for specified clearances for
combustible material.
Note:
Indicated clearances are minimum values; leave enough space
for burner removal and cleaning of the heat exchanger.
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H2O BOILER HC SERIES IOM Manual
2.4 Location
This boiler/water heater is for indoor installation only.
For service access to the Burner control box, condensate drain “U” trap, and gas train, refer
to the clearances indicated on the boiler/water heater rating plate. Note that some
jurisdictions may have their own clearance requirements. In such cases refer to all
applicable local codes.
The boiler/water heater can be placed in a basement or utility room. It should not be placed
in an unconditioned area where the unit and condensation could be subject to freezing
temperatures.
For reduced installation cost, locate the boiler/water heater as close to an outside wall as
possible.
Flue gases can be vented out directly through a wall, or in case of retrofit installation, the
flue gas duct can be extended into the existing chimney.
Keep boiler/water heater area clear and free from combustible materials, gasoline,
flammable vapors and liquids.
Ensure that inlet to the blower is kept clear of any obstruction so that combustion air can
flow freely through to the air intake blower.
A resilient pad to separate the boiler/water heater from floor when the appliance is installed
directly on carpeting, the appliance shall be installed on a metal or wood panel extending
beyond the full width and depth of the appliance by at least 3 in (76.2 mm) in any direction
or, if the appliance is installed in an alcove or closet, the entire floor shall be covered by the
panel. The panel must be strong enough to carry the weight of the heater when full of
water.
Notes:
Never install directly on carpet.

For other than a direct vent appliance, the appliance must be located
as close as practicable to a chimney or gas vent.

The appliance should be located in an area where leakage of the tank
or connections will not result in damage to the area adjacent to the
appliance or to lower floors of the structure. When such locations
cannot be avoided, it is recommended that a suitable drain pan,
adequately drained, be installed under the appliance. The pan must
not restrict combustion air flow.
D-VAC Sales Inc. Email: [email protected] Tel: [phone] www.dvachvac.com