HydroTherm HVX-70, HVX-105, HVX-140, HVX-165 Installation And Operating Instructions Manual

HydroTherrw

HVX2-810

22-HVX2

m

f

This inanual s intended only fbl use by aqualified beatinginstaller/technician Read and followthis manual, allsupplements and related
instructional infbrmation proxided with tile boiler. Install,start and ser;ice tile boiler only in tile sequence and inethods gixen ill these

instructions. Faihn:eto do so can result in sexere personal injury,death or substantial property damage.
Do not use the boiler during construction. Construction dust and particulate, particularlydrywalldust,willcausecontamination of

the burner, resulting in possible sexere personal injury,death orsubstantial property damage. The boiler can only be operated with adust-
fi'eeair supply.Followthe instruction manual procedures to duct air to the boiler airintake. Ifthe boilerhas been contaminated byoperation

with contaminated air,fbllow the instruction manual guidelines to clean,repair or replace the boiler ifnecessary.

Affixthese instructions near to the boile,,,'water heate, lnst,uct the buikting owner to retain the instructions ibr ihture use by a qualified

servicetechnician, and to fbllowallguidelines in the User's Infbrmation Manual.

INSTALLATION AND OPERATING INSTRUCTIONS

A. INSTALLATION SEQUENCE ....................... 2

B. SPECIAL ATTENTION BOXES ..................... 2

,,

A. ACCESSIBILITY CLEARANCES .................... 3

B. CLEARANCE FROM COMBUSTIBLE

CONSTRUCTION ................................ 3

C. AIR FOR COMBUSTION AND VENTILATION ......... 3

D. PLANNING THE LAYOUT ......................... 6

E. MASSACHUSETTS INSTALLATIONS ............... 6

A. BOILER SUPPLY AND RETURN .................... 8

B. SAFETY RELIEF VALVE .......................... 9

C. PIPING FOR ZONED SYSTEMS ................... 10

D. EXPANSION TANK ............................. 11

E. INDIRECT-FIRED WATER HEATER ................. 11

E FREEZE PROTECTION .......................... 11

A. GENERAL .................................... 12

B. CHIMNEY VENTING ............................ 12

C. DIRECT EXHAUST HORIZONTAL VENTING ......... 12

D. DIRECT EXHAUST VERTICAL VENTING ............ 15

E. BOILER REMOVAL FROM

COMMON VENTING SYSTEM .................... 16

i iiiiiili:i !! i iii:i i i Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii Ii ! ii! 7iii

A. GENERAL .................................... 30

B. DAILY (WITH BOILER IN USE) .................... 30

C. WEEKLY (WITH BOILER IN USE) .................. 31

D. MONTHLY (WITH BOILER IN USE) ................ 31

E. ANNUALLY (BEFORE START OF HEATING

SEASON) ..................................... 31

A. BLOCK/BASE/FLOOR PAN

JACKET/FLUE COLLECTOR ...................... 33

B. BASE/BURNERS/MANIFOLD ..................... 34

f:ll II_!.'tq.'lli!.'l/[o]_l _.'];[o].lJ!_[o,]!

Follow the installation instructions provided in this

manual in the order shown. The order of these
instructions has been set in order to provide the

installer with a logical sequence of steps that will
minimizepotential interferences and maximize safety
during boiler installation.

I:!1 [,-l'.l:l:l]llllfll//!_i/[o]_l I:{o):t_ _7

Throughout this manual you will see special attention
boxes intended to supplement the instructions and
make special notice of potential hazards. These
categories mean, in the judgment of the manufacturer:

A. WIRING ...................................... 19

B. ZONED SYSTEM WIRING ....................... 19

C. CONTROLS ................................... 19

D. SEQUENCE OF OPERATION ..................... 20

A. COMPLETING THE INSTALLATION ................ 23

B. CONTROL DESCRIPTIONS ....................... 25

C. ADJUSTMENT OF GAS PRESSURE REGULATOR .... 25

D. CHECKING BURNER INPUT ...................... 25

E. CHECK-OUT PROCEDURE ....................... 25

A. SHUT-DOWN CAUSED BY PILOT OUTAGE,

PRESSURE SWITCH OR FLAME ROLL-OUT

SAFETY SHUT-OFF SWITCH ..................... 27

B. TROUBLESHOOTING GUIDES .................... 27

C. MEASURING SUCTION PRESSURE ............... 27

Indicates a condition or hazard which will cause
severe personal injury, death or major property

damage.

Indicates a condition or hazard which may cause

severe personal injury, death or major property

damage.

Indicates a condition or hazard which will or can
cause minor personal injury or property damage.

Indicates special attention is needed, but not directly
related to potential personal injury or property
damage.

2

INSTALLATION AND OPERATING INSTRUCTIONS

Read carefully, study these instructions before beginning work.
This boiler must be installed by a qualified contractor.
The boiler warranty can be voided if the boiler is not installed, maintained and serviced correctly.

The equipment must be installed in accordance with those installation requirements of the authority having
jurisdiction or, in the absence of such requirements, to the current edition of the National Fuel Gas Code, ANSI
Z223.1/NFPA 54 and/or CAN/CSA B149.1, Natural Gas and Propane Installation Code.

Where required by the authority having jurisdiction, the installation must conform to American Society of

Mechanical Engineers Safety Code for Controls and Safety Devices for Automatically Fired Boilers,

ANSI/ASME CSD-I.

7._I V.'I_H _'_11:] I! / L'd[_]! =!'.'I:!.'I_[_]_1

Install boiler not less than 24" (610 mm) between the

left side, top, and front of the boiler and adjacent wall or
other appliance, when access is required for servicing.

The design of this boiler is certified for closet installation
with the following clearances:

1. 6" (152 mm) between sides, rear and front and
combustible construction.

2. 24" (610 mm)between top of jacket and
combustible construction.

3. 2" (51 mm) between vent pipe and combustible
construction.

Do not install this boiler on combustible flooring
unless it is installed on a special combustible floor
pan provided by the manufacturer. Boiler installation

on combustible flooring without the special pan is a
fire hazard.

To order combustible floor pan, use the 5-digit stock
codes listed in Section 11 of this manual.

Do not install this boiler on carpeting. Boiler
installation on carpeting is a fire hazard. Install this

boiler on non-combustible flooring or use a

combustible floor pan to install this boiler on other

non-carpeted flooring.

1.

Adequate combustion air and ventilation air must be

provided in accordance with section 5.3, Air for
Combustion and Ventilation, of the National Fuel

Gas Code, ANSI Z223.1/NFPA 54, or Sections 7.2,

7.3 or 7.4 of CAN/CSA B149.1, Natural Gas and
Propane Installation Code or applicable provisions of

the local building code. Subsections 2 through 8 as
follows are based on the National Fuel Gas Code

requirements.

2.

Required Combustion Air Volume: The total required
volume of indoor air is to be the sum of the required
volumes for all appliances located within the space.

Rooms communicating directly with the space in
which the appliances are installed and through
combustion air openings sized as indicated in

Subsection 3 are considered part of the required
volume. The required volume of indoor air is to be
determined by one of two methods.

a. Standard Method: The minimum required

volume of indoor air (room volume) shall be 50
cubic feet per 1000 BTU/Hr (4.8 m3/kW). This

method is to be used if the air infiltration rate is
unknown or if the rate of air infiltration is known

to be greater than 0.6 air changes per hour. As
an option, this method may be used if the air

infiltration rate is known to be between 0.6 and

0.4 air changes per hour. If the air infiltration rate
is known to be below 0.4 then the Known Air

Infiltration Rate Method must be used. If the

building in which this appliance is to be installed
is unusually tight, we recommend that the air

infiltration rate be determined.

b. Known Air Infiltration Rate Method: Where

the air infiltration rate of a structure is known, the
minimum required volume of indoor air for the

boiler and other fan assisted appliances shall be
determined as follows:

Required Volumerar7i 15 ft3 / rat7

AC H 1o00BtU/hr

INSTALLATION AND OPERATING INSTRUCTIONS

where:

It_n = Input of the fan assisted appliances in

ACH = air change per hour (percent of the

For appliances other than fan assisted, calculate
the required volume of air using the following
equation:

Required Volumeother = ACH lO00BtU/hr

Btu/hr

volume of the space exchanged per
hour, expressed as a decimal)

21 ft-s I other

Iother = Input of appliances other than fan

assisted in Btu/hr

Note: These calculations are not to be used for

infiltration rates greater than 0.60 ACH.

3.

Indoor Air Openinq Size and Location: Openings

connecting indoor spaces shall be sized and located
as follows:

a. Combining spaces on the same floor:

Provide two permanent openings communicating
with additional spaces that have a minimum free
area of 1 in 2 per 1000 Btu/hr (22 cm 2 per 1000 W)
of the total input rating of all gas fired equipment

but not less than 100 in 2 (645 cm2). One
opening is to begin within 12 inches (305 mm)
from the top of the space and the other is to

begin within 12 inches (305 mm) from the floor.
The minimum dimension of either of these

openings shall be 3 inches (76 mm). See Figure

1.1 for an illustration of this arrangement.

12" (305mrs')

TWO AIR OPENINGS:

Minimum

Free Area Each

1 in 2 per 1000 Btuh

(22 errF per 1000 W)

at Least 100 in 2

(645 cm 2 )

4

s" (Turin)

min

3" (76ram)

rain

12" 505rr r_')max

m(lx

BUILDING

(SPACES ON

SAME STOU)

Must not be under

negative pressure

Figure 1.2:

4.

Outdoor Combustion Air: Outdoor combustion air is
to be provided through one or two permanent

openings. The minimum dimension of these air
openings is 3 inches (76 mm).

a. Two Permanent Opening Method: Provide

12" (505rr'm)maxi

Air Openings - All Air from Indoors
on Different Floors

two permanent openings. One opening is to

begin within 12 inches (305 mm) of the top of

the space and the other is to begin within 12

inches (305 mm) of the floor. The openings are
to communicate directly or by ducts with the
outdoors or with spaces that freely communicate
with the outdoors. The size of the openings shall

be determined as follows:

Where communicating directly or through
vertical ducts with the outdoors each opening
shall have a minimum free area of 1 in2 per
4000 Btu/hr (22 cm 2 per 4000 W) of total
input rating for all equipment in the space.
See Figure 1.3 for openings directly
communicating with the outdoors or Figure

1.4 for openings connected by ducts to the
outdoors.

\

\,

\ \,

Figure 1.1 :

Air Openings - All Air from Indoors
on the Same Floor

b.

Combining spaces on different floors:

Provide one or more permanent openings
communicating with additional spaces that have
a total minimum free area of 2 in2 per 1000

Btu/hr (44 cm 2 per 1000 W) of total input rating
of all equipment. See Figure 1.2 for an

illustration of this arrangement.

4

3" (76rnm)

12" (305ram)

too×

Figure 1.3:

........iiiiiiii

rain

Air Openings - All Air Directly from
Outdoors

INSTALLATION AND OPERATING INSTRUCTIONS

12" (505r r)rax I

z

(

MINIM JM
CLEARANCES:
" (P r/r ) Fr rY
_ides qrd back
6" (/5( rYr 0

frorr frort

Figure 1.4:

12" (:SO5r r)r_ax I

Figure 1.5:

Air Openings - All Air from Outdoors
through Vertical Ducts

ii,

Where communicating with the outdoors

through horizontal ducts, each opening shall

have a minimum free area of 1 in2 per 2000
Btu/hr (22 cm 2 per 2000 W) of total rated
input for all appliances in the space. See
Figure 1.5.

Air Openings - All Air from Outdoors
through Horizontal Ducts

b.

One Permanent Opening Method: Provide
one permanent opening beginning within 12

inches (305 mm) of the top of the space. The
opening shall communicate directly with the
outdoors, communicate through a vertical or

horizontal duct, or communicate with a space
that freely communicates with the outdoors. The
openings shall have a minimum free area of 1 in 2

per 3000 Btu/hr of total rated input for all
appliances in the space and not less than the

sum of the cross-sectional areas of all vent
connectors in the space. The gas fired equipment

shall have clearances of at least 1 inch (25 mm)
from the sides and back and 6 inches (150 mm)
from the front of the appliance. See Figure 1.6
for this arrangement.

Figure 1.6: Air Openings - All Air from Outdoors

through One Opening

5. Combination Indoor and Outdoor Combustion Air:

If the required volume of indoor air exceeds the
available indoor air volume, outdoor air openings or
ducts may be used to supplement the available

indoor air provided:

a. The size and location of the indoor openings

comply with Subsection 3.

b. The outdoor openings are to be located in

accordance with Subsection 4.

c. The size of the outdoor openings are to be sized

as follows:

Vavail

A,-eq=A_u// x 1- V,eq

where:

Areq = minimum area of outdoor openings.
Atull = full size of outdoor openings calculated

in accordance with Subsection 4,

V_vail = available indoor air volume
Vreq = required indoor air volume

6.

Engineered Installations: Engineered combustion air

installations shall provide an adequate supply of
combustion, ventilation, and dilution air and shall be
approved by the authority having jurisdiction.

7. Mechanical Combustion Air Supply:

a. In installations where all combustion air is

provided by a mechanical air supply system, the
combustion air shall be supplied from the
outdoors at the minimum rate of 0.35 ftS/min per
1000 Btu/hr (0.034 mS/min per 1000 W) of the
total rated input of all appliances in the space.

b. In installations where exhaust fans are installed,

additional air shall be provided to replace the
exhaust air.

INSTALLATION AND OPERATING INSTRUCTIONS

Each of the appliances served shall be
interlocked to the mechanical air supply to
prevent main burner operation where the
mechanical air supply system is not in operation.

d.

In buildings where the combustion air is provided

by the mechanical ventilation system, the system
shall provide the specified combustion air rate in
addition to the required ventilation air.

8.

Louvers & Grills:
a. The required size of openings for combustion,

ventilation, and dilution air shall be based on the

net free area of each opening.

Where the free area through a louver or grille
is known, it shall be used in calculating the
opening size required to provide the free area
specified.

ii.

Where the free area through a louver or grille
is not known, it shall be assumed that wooden

louvers will have 25% free area and metal
louvers and grilles will have 75% free area.

iii. Nonmotorized dampers shall be fixed in the

open position.

b.

Motorized dampers shall be interlocked with the
equipment so that they are proven in the full
open position prior to ignition and during
operation of the main burner.

i. The interlock shall prevent the main burner

from igniting if the damper fails to open
during burner startup.

ii. The interlock shall shut down the burner if

the damper closes during burner operation.

9.

Combustion Air Ducts:

a. Ducts shall be constructed of galvanized steel or

an equivalent corrosion- resistant material.

b.

Ducts shall terminate in an unobstructed space,
allowing free movement of combustion air to the
appliances.

c.

Ducts shall serve a single space.

d.

Ducts shall not serve both upper and lower
combustion air openings where both such
openings are used. The separation between ducts
serving upper and lower combustion air
openings shall be maintained to the source of

combustion air.

Ducts shall not be screened where terminating in
an attic space.

The remaining space surrounding a chimney

g.

liner, gas vent, special gas vent, or plastic piping
installed within a masonry, metal, or factory built
chimney shall not be used to supply combustion

air.

h.

Combustion air intake openings located on the
exterior of buildings shall have the lowest side of
the combustion air intake opening at least 12
inches (305 mm) above grade.

Liquefied Petroleum (LP) is heavier than air and may
collect or "pool" in a low area in the event of a leak
from defective equipment. This gas may then ignite,
resulting in a fire or explosion.

I,]il I',ji_':_l_ll_[_//:l:! I!':VL*IIJd

Prepare sketches and notes of the layout to minimize the
possibility of interferences with new or existing
equipment, piping, venting and wiring.

I_ hv_P';T,."_"]P';[o,]'LU_")_/n_Ih_(,."]iq±_iUlip'±_id[o]_(,."]

Massachusetts requires manufacturers of Side Wall

Vented boilers to provide the following information
from the Massachusetts code:

• A hard wired carbon monoxide detector with an
alarm and battery back-up must be installed on

the floor level where the gas equipment is to be
installed AND on each additional level of the

dwelling, building or structure served by the side
wall horizontal vented gas fueled equipment.

• In the event that the side wall horizontally vented
gas fueled equipment is installed in a crawl space
or an attic, the hard wired carbon monoxide
detector with alarm and battery back-up may be
installed on the next adjacent floor level.

• Detedor(s) must be installed by qualified licensed
professionals.

• APPROVED CARBON MONOXIDE

DETECTORS: Each carbon monoxide detector

shall comply with NFPA 720 and be ANSI/UL
2034 listed and IAS certified.

• SIGNAGE: A metal or plastic identification plate
shall be permanently mounted to the exterior of

the building at a minimum height of eight (8) feet
above grade directly in line with the exhaust vent

terminal for the horizontally vented gas fueled
heating appliance or equipment. The sign shall

read, in print size no less than one-half (1/2) inch
in size, "GAS VENT DIRECTLY BELOW.

KEEP CLEAR OF ALL OBSTRUCTIONS".

Horizontal upper combustion air ducts shall not

slope downward toward the source of the
combustion air.

6

INSTALLATION AND OPERATING INSTRUCTIONS

EXEMPTIONS to the requirements listed above:
o The above requirements do not apply if the

exhaust vent termination is seven (7) feet or
more above finished grade in the area of the

venting, including but not limited to decks
and porches.

o The above requirements do not apply to a

boiler installed in a room or structure separate
from the dwelling, building or structure used
in whole or in part for residential purposes.

See the latest edition of Massachusetts Code
248 CMR for complete verbage and also for

additional (non-vent related) requirements
(248 CMR is available online).

If your installation is NOT in Massachusetts, please
see your authority of jurisdiction for requirements
that may be in effect in your area. In the absence of
such requirements, follow the National Fuel Gas

Code, ANSI Z223.1/NFPA 54 and/or CAN/CSA

B149.1, Natural Gas and Propane Installation Code.

Venting System Installation Instructions - See

boiler manual and instructions provided with the
Venting System components. Additional copies may

be obtained from the Venting System Manufacturer

by visiting the following web addresses:

Heat-Fab - www.selkirkcorp.com/heatfab
Z-Flex - www.NovaFlex.com

Pro-Tech - www.protechinfo.com
MetaI-Fab - www.rntlfab.com

1.

Provide a sound, level foundation. Locate boiler as
near to the chimney or outside wall as possible and

centralized with respect to the heating system.

2.

Locate boiler in front of installation position before

removing crate.

3.

If using combustible floor pan, position pan on

foundation or flooring.

4.

Separate the wood shipping pallet from the boiler

base by removing two (2) hold-down bolts at each
end of the boiler base.

5.

Move boiler into final position. If using combustible
floor pan, install boiler on pan as outlined in the

instructions included with the pan.

INSTALLATION AND OPERATING INSTRUCTIONS

f.'1 I:{=] I I!=1:| [_llJ d d li'AV.'I_I=]I :_=l|lJ :__I

1.

Size the supply and return to suit the system. A
typical piping arrangement is shown in Figure 3.1.

Refer also to the I=B=R Guide to Residential

Hydronic Heating Installation/Design for additional

guidance during water piping installation.

2.

Return Piping:

a. Pipe the outlet connection of the circulator to a

tee, provided with a drain valve, at the 1-1/4

NPT return tapping near the bottom of the left

section. Pipe the return to the inlet connection of
the circulator.

3.

Supply Piping:

Pipe the supply to the 1-1/2 NPT supply tapping at
the top of the boiler.

4.

When system return water temperature will be below

130°F (54°C), pipe the boiler with a bypass
arrangement to blend the system return and hot
supply to obtain at least 130°F (54°C) entering the

boiler.

5.

If desired, install the circulator in the alternate

location shown in Figure 3.1.

SUPPLY

COLD

£R

SHUTOFF

PRESSUREREDUCING

CHECK

SHUTOFFVALVE

ELIMINATOR

_AFETYRELIEFVALVE

EXPANSION TANK

Figure 3.1: Supply and Return Piping

8

INSTALLATION AND OPERATING INSTRUCTIONS

6.

Install this boiler so that the gas ignition system
components are protected from water (dripping,
spraying, etc.) during appliance operation and
service (circulator replacement, condensate trap,
control replacements, etc.).

7.

If this boiler and distribution system is used in
conjunction with a refrigeration system, pipe the
chilled medium in parallel with the boiler and install
the proper valve to prevent the chilled medium from
entering the boiler. A drawing illustrating this hook-
up is provided in Figure 3.2.

8.

When the boiler is connected to heating coils located
in air handling units where they may be exposed to
refrigerated air circulation, install flow control valves
or other automatic means to prevent gravity
circulation of the boiler water during the cooling
cycle.

9.

If this boiler is installed above radiation level,
provide a low water cutoff device, either as a part of

the boiler or at the time of boiler installation.

SL PPLY -,

Figure 3.3:

....... SAFETY

RELIEF
'iALVE

TO DRAII

\

\

/

f_- -

/

/

Safety Relief Valve Hook-Up
Installation with Air Elimination in

System Piping

I:]! [,,._.qgl=il,',dI:_=lltll=lglkV/.qlkVj=l

1. Locate safety relief valve and fittings in bag
assembly.

2. If air elimination is not required at the safety relief
valve tapping, install valve and piping as shown in

Figure 3.3.

3. For air elimination at the safety relief valve tapping,
install valve and piping as shown in Figure 3.4.

Pipe the discharge of safety relief valve to prevent

injury in the event of pressure relief. Pipe the
discharge to a drain. Provide piping that is the same
size as the safety relief valve outlet.

CHECK VAL:VE--. ,\

TO '_,IR

ELI qlX ,_TION

DEVICE

U1:FLY

SAFETY
RELIEF

vALVE --.

/ 3/4" TEE

3,/4" X _"

N I _: LE

/ _/'q" X 2"

NIPPLE

/

/

/

ELB0 ,_v \ ..... .

J

/

Figure 3.4: Safety Relief Valve Hook-Up with

Air Elimination

WAT ER THR_Eo WAY

Figure 3.2: Parallel Hook-up with Water Chiller

LNE

VALVE

INSTALLATION AND OPERATING INSTRUCTIONS

1.

See Figures 3.5 and 3.6 for basic zoned system
layouts.

2.

Run each zone pipe down then up to zone to
prevent air accumulation in piping.

3.

If required, provide means to isolate and drain each

zone separately.

TO SYSTEM

ZONE ZONE

3 2

VALVES

B-_ I CHECK

TO BYPASS VALVE

CITY WATER

SHUTOFF VALVE

PRESSURE REGULATOR

Figure 3.5: Zone Piping with Zone Valves

ZONE

1

SYSTEM
CIRCULATOR

CONNECT

SUPPLY

BALANCING ,

VALVES H, _-

CONNECT TO

TO

EXPANSION TANK

RETURN

FROM SYSTEM

ZONE ZONE ZONE

1 2 5

FROM

BYPASS

FROM SYSTEM

ZONE ZONE ZONE

1 2 5

ZONE

CIRCULATORS

CHECK VALVE

CITY WATER

SHUTOFF VALVE

PRESSURE REGULATOR

Figure 3.6: Zone Piping with Circulators

10

CONNECT

TO

SUPPLY

FLOW

CONTROL

VALVES

CONNECT TO

RETURN

TAPPING

EXPANSION TANK

TO SYSTEM

ZONE ZONE

3 2

!

ZONE

1

t

INSTALLATION AND OPERATING INSTRUCTIONS

1, Consult the tank manufacturer's instructions for

specific information relating to tank installation. Size
the expansion tank for the required system volume
and capacity. See Table 10.2 in Section 10 for boiler
water capacity.

2. Expansion tanks are available with built-in fill valves
and check valves for reducing supply water pressure
and maintaining minimum system pressure. Check
the design features of the tank and provide valves as
necessary.

Refer back to Figure 3.1 for typical expansion tank piping.

:II IhH,] 1:1:(.i ,'li 1:1!,] iviv/.,l/ ! :I I: I:/.,1i ! :1

If the boiler is to be used in conjunction with an indirect-

fired water heater, refer to Figure 3.7 for typical piping.

Follow the instructions provided by the water heater

manufacturer. Pipe the water heater as a separate zone.

II1_1!:I'I ! ".1f(,l i :(,.i i [,] _IOI 1:13".1.'I_q,.'][.] _Ii L'I _H3

For new or existing systems that must be freeze-
protected:

Use only inhibited propylene glycol solutions of up to
50% by volume with water. Ethylene glycol is toxic
and can attack gaskets and seals used in hydronic
systems.

1,

Glycol in hydronic applications is specially
formulated for this purpose. It includes inhibitors
which prevent the glycol from attacking metallic
system components. Make certain that the system
fluid is checked for the correct glycol concentration

and inhibitor level.

2,

The antifreeze solution should be tested at least once
a year and as recommended by the antifreeze

manufacturer.

3,

Antifreeze solutions expand more than water. For
example, a 50% by volume solution expands 4.8%

in volume for a temperature increase from 32°F

(O°C) to 180°F (82°C), while water expands 3% with
the same temperature rise. Allowance must be made
for this expansion in system design.

SYSTEM

CIRCULATOR

SUPPLY TO

SYSTEM

EXPANSION

TANK

RETURN FROM

SYSTEM

HOT DOMES'I'IC

WATER

SUPPLY

COLD

DOMESTIC

WATER SUPPLY

ZONE VALVES

INDIRECT=FIRED

WATER

HEATER

SUPPLY

TO

TANK

BALANCING

VALVE

Figure 3.7: Typical Piping with Indirect-Fired Water Heater

SHUTOFF

VALVE

BALANCING
VALVE:

DRAIN

CHECK
VALVE

SHUTOFF

VALVE

PRESSURE
REGULATOR

COLD

-- WATER
FILL

11