Raypak 122-322 User Manual

INSTALLATION & OPERATING

INSTRUCTIONS

CATALOG NO. 1000.53H Effective: 09-19-08 Replaces: 11-16-07 P/N 241112 Rev. 9

WARNING: If these instructions are not followed exactly, a fire or explosion may
result causing property damage, personal injury or death

.

FOR YOUR SAFETY: Do not store or use gasoline or other flammable vapors and
liquids or other combustible materials in the vicinity of this or any other appliance. To
do so may result in an explosion or fire.

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 instructions.

• 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.

This manual should be maintained in legible condition and kept adjacent to the heater or in another safe place for
future reference.

Models 122–322

Types H, WH & P

L

W

2

Rev. 9 reflects the following: Changes to: The text in the BEFORE INSTALLATION section on page 5; the text in paragraph
one of the GENERAL SAFETY section on page 8; the text in paragraph one of the Outdoor Installations section on page
10; Table E on page 10; the wiring diagram on page 35.

WARNINGS 4

Pay Attention to These Terms 4

BEFORE INSTALLATION 5

Product Receipt 5
Model Identification 5
Ratings and Certifications 5
Installations at Elevation 5
Component Locations 6
General Information 7
Time/Temperature Relationships in Scalds 8

GENERAL SAFETY 8

Clearances 9
Equipment Base 9

INSTALLATION 9

Installation Codes 9
Combustion and Ventilation Air 11
Conventional Combustion Air Supply 11
Water Piping 12
Hydronic Heating 13
Domestic Hot Water Piping 15
Pool Heating 17
Gas Supply 17
Electrical Power Connections 19
Venting 21
Outdoor Installation 32
High Limit (Manual Reset) 33
Flow Switch 33

CONTROLS 33

Ignition Control Module 33
Low Water Cut Off (Optional) 34
Operating Control 34

WIRING DIAGRAM—MODELS 122
–322 35
PRE-START-UP 36

Filling System-Heating Heaters 36
Domestic Hot Water Heaters 36
Inspect Venting System 36
For Your Safety Read Before Lighting 36
Pre-Start-Up Check 36

INITIAL START-UP 36

Tools Needed 36
Preparation for Start-Up 36
Start-Up 37

Main Burner Adjustment 37
Safety Inspection 37
Follow-Up 38

POST START-UP CHECK 38
OPERATION 38

Operating Instructions 38
To Turn Off Gas To Appliance 39

MAINTENANCE 39

Suggested Minimum Maintenance
Schedule 39

APPENDIX 40

Inside Combustion Air Contamination 40

CONTENTS

3

DANGER:

Indicates the presence of immediate hazards which will cause severe
personal injury, death or substantial property damage if ignored.

WARNING:

Indicates the presence of hazards or unsafe practices which could cause
severe personal injury, death or substantial property damage if ignored.

CAUTION:

Indicates the presence of hazards or unsafe practices which could cause
minor personal injury or product or property damage if ignored.

NOTE:

Indicates special instructions on installation, operation, or maintenance which
are important but not related to personal injury hazards.

DANGER: Make sure the gas on which the heater
will operate is the same type as that specified on the
heater rating plate.

WARNING: Should overheating occur or the gas
supply valve fail to shut, do not turn off or disconnect
the electrical supply to the heater. Instead, shut off
the gas supply at a location external to the heater.

WARNING: Do not use this heater if any part has
been under water. Immediately call a qualified
service technician to inspect the heater and to
replace any part of the control system and any gas
control which has been under water.

WARNING: To minimize the possibility of improper
operation, serious personal injury, fire, or damage to
the heater:

• Always keep the area around the heater free of
combustible materials, gasoline, and other
flammable liquids and vapors.

• Heater should never be covered or have any
blockage to the flow of fresh air to the heater.

WARNING - CALIFORNIA PROPOSITION
65: This product contains chemicals known to the

State of California to cause cancer, birth defects or
other reproductive harm.

WARNING: Risk of electrical shock. More than one
disconnect switch may be required to deenergize the
equipment before servicing.

CAUTION: Operation of this heater in low­temperature systems requires special piping.
Harmful internal condensation will occur if the inlet
water temperature does not exceed 105°F. Warranty
claims will be denied when condensation occurs.

CAUTION: If this heater is to be installed above
radiation level, it must be provided with a low water
cut-off device at the time of heater installation.

CAUTION: If this heater is to be installed in a
negative or positive pressure equipment room, there
are special installation requirements. Consult factory
for details.

WARNINGS - Pay Attention to These Terms

4

CAUTION: This heater requires forced water
circulation when the burner is operating. See
minimum and maximum flow rates. Severe damage
will occur if the heater is operated without proper
water flow circulation.

WARNING: This unit contains refractory ceramic
fiber (RCF) insulation in the combustion chamber.
RCF, as manufactured, does not contain respirable
crystalline silica. However, following sustained
exposure to very high temperatures (>2192F), the
RCF can transform into crystalline silica
(cristabolite). The International Agency for Research
on Cancer (IARC) has classified the inhalation of
crystalline silica (cristabolite) as carcinogenic to
humans.

When removing the burners or heat exchangers,
take precautions to avoid creating airborne dust and
avoid inhaling airborne fibers. When cleaning spills,
use wet sweeping or High Efficiency Particulate Air
(HEPA) filtered vacuum to minimize airborne dust.
Use feasible engineering controls such as local
exhaust ventilation or dust collecting systems to
minimize airborne dust. Wear appropriate personal
protective equipment including gloves, safety
glasses with side shields, and appropriate NIOSH
certified respiratory protection, to avoid inhalation of
airborne dust and airborne fiber particles.

BEFORE INSTALLATION

Raypak strongly recommends that this manual be re­viewed thoroughly before installing your Hi Delta
heater. Please review the General Safety information
before installing the heater. Factory warranty does not
apply to heaters that have been improperly installed or
operated (refer to the warranty at the back of this man­ual). Installation and service must be performed by a
qualified installer, service agency or the gas supplier.
If, after reviewing this manual, you still have questions
which this manual does not answer, please contact
your local Raypak representative or visit our website at
www.raypak.com.

Thank you for purchasing a Raypak product. We hope
you will be satisfied with the high quality and durability
of our equipment.

Product Receipt

On receipt of your heater it is suggested that you visu­ally check for external damage to the shipping crate. If
the crate is damaged, make a note to that effect on the
Bill of Lading when signing for the shipment. Next,
remove the heater from the shipping packaging.
Report any damage to the carrier immediately.

On occasion, items are shipped loose. Be sure that
you receive the correct number of packages as indi­cated on the Bill of Lading.

Claims for shortages and damages must be filed with
the carrier by consignee. Permission to return goods
must be received from the factory prior to shipping.
Goods returned to the factory without an authorized
Returned Goods Receipt number will not be accepted.
All returned goods are subject to a restocking charge.

When ordering parts, you must specify the model and
serial number of the heater. When ordering under war­ranty conditions, you must also specify the date of
installation.

Purchased parts are subject to replacement only
under the manufacturer’s warranty. Debits for defec­tive replacement parts will not be accepted. Parts will
be replaced in kind only per Raypak’s standard war­ranties.

Model Identification

The model identification number and heater serial
number are found on the heater data plate located on

the left inside jacket of the heater. The model number
will have the form H3 0162 or similar depending on the
heater size and configuration. The first character of the
model number identifies application (H = Hydronic
Heating System, WH = Hot Water Supply System, P =
Pool Application). The second character identifies the
firing mode (3 - two stage firing, 4 - On/Off firing ). The
next four places identify the size of the heater.

Ratings and Certifications

Standards:

• Gas-Fired Low Pressure Steam and Hot Water
Heaters, ANSI Z21-13 • CSA 4.9 - latest edition

• Industrial and Commercial Gas-Fired Package
Heaters, CAN 3.1 - latest edition

• Gas-Fired Pool Heaters, ANSI Z21.56 • CSA 4.7 ­latest edition

• Gas Water Heaters, ANSI Z21.10.3 • CSA 4.3 - lat­est edition

All Raypak heaters are National Board Approved, and
design-certified and tested by the Canadian Standards
Association (CSA) for the U.S. and Canada. Each
heater is constructed in accordance with Section IV of
the American Society of Mechanical Engineers
(ASME) Heater Pressure Vessel Code and bears the
ASME stamp. The heater also complies with the latest
edition of ASHRAE 90.1 Standard.

Installations at Elevation

Rated inputs are suitable for up to 4500 feet elevation
without de-rate. Consult the Factory for installations at
any altitude in excess of 4500 feet.

WARNING: Altering any Raypak pressure vessel
by installing replacement heat exchangers, tube
bundle headers, or any ASME parts not
manufactured and/or approved by Raypak will
instantly void the ASME and CSA ratings of the
vessel and any Raypak warranty on the vessel.
Altering the ASME or CSA ratings of the vessel also
violates national, state, and local approval codes.

5

Component Locations

Fig. 1: Component Locations—Back

Fig. 2: Component Locations—Left Side

Panels removed for clarity

Fig. 3: Component Locations—Front

6

HI LIMITS

FLUE EXHAUST

PRESSURE RELIEF
CONNECTION

COMBUSTION AIR
INTAKE

HI-LIMITS

WATER OUTLET

GAS CONNECTION

WATER INLET

VIEW PORT

Fig# 9399

General Information

Table A: Basic Data

Table B: Manifold Data

Model

No.

Quantity of Vent Size (in.)

Burners Gas Valves Blowers Flue Intake

122 3 2* 1 4 5

162 4 2* 1 5 5

202 5 2* 1 5 5

242 6 2* 1 5 5

322 8 2* 1 6 5

Model

No.

Burners per Valve Stages % Fire at Stage

A B 1 2 1 2

122 2 1 A AB 66 100

162 3 1 A AB 75 100

202 3 2 A AB 60 100

242 4 2 A AB 66 100

322 5 3 A AB 63 100

7

*Second valve located inside air plenum

Fig. 4: Gas Valve Detail

Fig. 5: Air Shutter Adjustment

GENERAL SAFETY

To meet commercial hot water use needs, the high
limit safety control on this water heater will shut off the
main gas valve before the outlet temperature reaches
210°F. However, water temperatures over 125°F can
cause instant severe burns or death from scalds.
When supplying general purpose hot water, the rec­ommended initial setting for the temperature control is
125°F.

Safety and energy conservation are factors to be con­sidered when setting the water temperature on the
thermostat. The most energy-efficient operation will
result when the temperature setting is the lowest that
satisfies the needs of the application.

Water temperature over 125°F can cause instant
severe burns or death from scalds. Children, disabled
and elderly are at highest risk of being scalded.

• Feel water before bathing or showering.

• Temperature limiting valves are available.

Maximum water temperatures occur just after the
heater’s burner has shut off. To determine the water
temperature being delivered, turn on a hot water
faucet and place a thermometer in the hot water
stream and read the thermometer.

NOTE: When this water heater is supplying general
purpose hot water for use by individuals, a
thermostatically controlled mixing valve for reducing
point of use water temperature is recommended to
reduce the risk of scald injury. Contact a licensed
plumber or the local plumbing authority for further
information.

Time/Temperature
Relationships in Scalds

The following chart details the relationship of water
temperature and time with regard to scald injury and
may be used as a guide in determining the safest
water temperature for your applications.

Table C: Time to Produce Serious Burn

8

Water temperature over 125°F can
cause instant severe burns or death
from scalds.

Children, disabled, and elderly are
at highest risk of being scalded.

See instruction manual before set­ting temperature at water heater.

Feel water before bathing or show­ering.

Temperature limiting valves are
available, see manual.

Water

Temp.

120°F More than 5 minutes

125°F 1-1/2 to 2 minutes

130°F About 30 seconds

135°F About 10 seconds

140°F Less than 5 seconds

145°F Less than 3 seconds

150°F About 1-1/2 seconds

155°F About 1 second

Table courtesy of The Shriners Burn Institute

Time to Produce Serious

Burn

INSTALLATION

INSTALLATION

Installation Codes

Installations must follow these codes:

· Local, state, provincial, and national codes, laws,
regulations and ordinances.

· National Fuel Gas Code, ANSI Z223.1- latest edi­tion (NFGC).

· National Electrical Code, ANSI/NFPA 70 - latest
edition (NEC).

· Standard for Controls and Safety Devices for
Automatically Fired Heaters, ANSI/ASME CSD-1,
when required (CSD-1).

· For Canada only: CAN/CGA B149 Installation
Code (B149) and C.S.A. C22. 1 C.E.C. Part 1
(C22. 1).

The temperature of the water in the heater can be reg­ulated by using the temperature control. To comply
with safety regulations, the temperature control is set
at the lowest setting when shipped from the factory.

To adjust the water temperature, insert a small straight
screwdriver into the adjustment screw on the front of
temperature control and turn the wheel to the desired
setting (See Fig. 6).

CAUTION: Hotter water increases the risk of scald­ing! There is a hot water scald potential if the
thermostat is set too high.

Fig. 6: Temperature Control

Equipment Base

The heater should be mounted on a level, structurally
sound surface. The heater is approved for installation
on a combustible surface but must NEVER be
installed on carpeting. Gas-fueled equipment installed
in enclosed parking garages must be located at least
18 in. above the floor.

CAUTION: The heater should be located in an area
where water leakage will not result in damage to the
area adjacent to the appliance or to the structure.
When such locations cannot be avoided, it is
recommended that a suitable catch pan, adequately
drained, be installed under the appliance. The pan
must not restrict air flow.

9

In addition, the heater shall be installed such that the
gas ignition system components are protected from
water (dripping, spraying, rain, etc.) during appliance
operation or service (circulator replacement, control
replacement, etc.).

WARNING: This product must be installed by a
licensed plumber or gas fitter when installed within
the Commonweatlh of Massachusetts.

Clearances

Indoor Installations

Table D: Clearances – Indoor Installations

* DO NOT install on carpeting.

Heater

Side

Floor* 0” 0”

Rear 1” 24”

Water Side 12” 24”

Other Side 1” 24”

Top 1” 1”

Front Open 24”

Vent 2” 2”

Minimum Clearance

from Combustible

Surfaces

Recommended

Service

Clearance

10

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Fig. 7: Minimum Clearances from Combustible Surfaces—Indoor Installations

When installed according to the listed minimum clear­ances from combustible construction, these heaters
can still be serviced without removing permanent
structural construction around the heater. However, for
ease of servicing, we recommend a clearance of at
least 24 in. in front, and at least 36 in. on the water
connection side. This will allow the heater to be serv­iced in its installed location without movement or
removal of the heater.

Service clearances less than the minimums may
require removal of the heater to service either the heat
exchanger or the burner tray. In either case, the heater
must be installed in a manner that will enable the
heater to be serviced without removing any structure
around the heater.

Table E: Clearances – Outdoor Installations

TOP VIEW

FRONT VIEW

Fig. 8: Minimum Clearances from Combustible Surfaces—Outdoor Installations

Outdoor Installations

These heaters are design-certified for outdoor installa­tion. Heaters must not be installed under an overhang
unless clearances are in accordance with local instal­lation codes and the requirements of the gas supplier.
Three sides must be open in the area under the over­hang. Roof water drainage must be diverted away
from heaters installed under overhangs.







!$

!$

Heater

Side

Front Open 24”

Rear 12” 24”

Water Side 36” 36”

Other Side 36” 36”

Top Unobstructed 36”

Vent N/A N/A

Min. Clearance

from Combustible

Surfaces

Recommended

Service

Clearance

 

11

a motorized sealed damper to prevent the circula­tion of cold air through the heater during the
non-operating hours.

Conventional Combustion Air
Supply

U.S. Installations

All Air from Inside the Building

The confined space shall be provided with two perma­nent openings communicating directly with an
additional room(s) of sufficient volume so that the com­bined volume of all spaces meets the criteria for an
unconfined space. The total input of all gas utilization
equipment installed in the combined space shall be
considered in making this determination. Each open­ing shall have a minimum free area of 1 square inch
per 1,000 Btu per hour (22 cm² per kW) of the total
input rating of all gas utilization equipment in the con­fined space, but not less than 100 in.² (645 cm²). One
opening shall commence within 12 in. (30 cm) of the
top, and one opening shall commence within 12 in. (30
cm) of the bottom, of the enclosure. The minimum
dimension of air openings shall be not less than 3 in.
(8 cm) in any direction.

All Air from Outdoors

The confined space shall communicate with the out­doors in accordance with methods 1 or 2. The
minimum dimension of air openings shall not be less
than 3 in. (8 cm) in any direction. Where ducts are
used, they shall be of the same cross-sectional area
as the free area of the openings to which they connect.

1. Two permanent openings, one commencing with­in 12 in. (30 cm) of the top, and one commencing
within 12 in. (30 cm) of the bottom, of the enclo­sure shall be provided. The openings shall
communicate directly, or by ducts, with the out­doors or spaces (crawl or attic) that freely
communicate with the outdoors.

a. Where directly communicating with the out-

doors or where communicating to the
outdoors through vertical ducts, each opening
shall have a minimum free area of 1 sq in. per
4000 Btu per hr (5.5 cm

2

per kW) of total input

rating of all equipment in the enclosure.

b. Where communicating with the outdoors

through horizontal ducts, each opening shall
have a minimum free area of 1 sq in. per 2000

Combustion and Ventilation Air

Indoor Units

The heater must be supplied with sufficient quantities
of non-contaminated air to support proper combustion
and equipment ventilation. Combustion air can be sup­plied via conventional means where combustion air is
drawn from the area immediately surrounding the
heater, or via direct vent, where combustion air is
drawn directly from outside. All installations must com­ply with the requirements of the NFGC (U.S.) and
B149 (Canada), and all local codes.

Direct Combustion Air

If outside air is drawn through the intake pipe directly
to the unit for combustion:

1. Install combustion air direct vent in accordance
with the venting section of this manual.

2. Provide adequate ventilation of the space occu­pied by the heater(s) by an opening(s) for
ventilation air at the highest practical point com­municating with the outdoors. The total
cross-sectional area shall be at least 1 in.

2

of free
area per 20,000 BTUH (111 mm2per kW) of total
input rating of all equipment in the room when the
opening is communicating directly with the out­doors or through vertical duct(s). The total
cross-sectional area shall be at least 1 in.

2

of free
area per 10,000 BTUH (222 mm

2

per kW) of total
input rating of all equipment in the room when the
opening is communicating with the outdoors
through horizontal duct(s).

3. In cold climates, and to mitigate potential freeze­up, Raypak highly recommends the installation of

CAUTION: Combustion air must not be
contaminated by corrosive chemical fumes which
can damage the heater and void the warranty. (See
the Appendix.)

These clearances are required when the outdoor
vent cap is used. If installing the heater outdoors
with a vent stack, the indoor clearances may be
utilized.

The combustion air intake hood MUST be used for
outdoor installations. The hood is shipped loose and
installed on the side of the heater over the filter box at
the job site.

12

WARNING: Do not use one permanent opening
method if the equipment room is under negative
pressure conditions or the equipment is common
vented with other gas-fired appliances.

1. Ventilation of the space occupied by the heater
shall be provided by an opening(s) for ventilation
air at the highest practical point communicating
with outdoors. The total cross-sectional area of
such an opening(s) shall be at least 10% of the
area required in (2) and (3), but in no case shall
the cross-sectional area be less than 10 sq. in.
(6500 sq. mm.).

2. For heaters using a barometric damper in the vent
system, and when air supply is provided by natu­ral air flow from the outdoors for natural draft,
partial fan assisted, fan-assisted or power draft­assisted burners, there shall be a permanent air
supply opening(s) having a cross section area of
not less than 1 sq. in. per 7000 BTUH (310 sq. mm
per kW) up to and including 1 million BTUH, plus
1 sq. in. per 14000 BTUH (155 sq. mm per kW) in
excess of 1 million BTUH. This opening(s) shall be
either located at or ducted to a point neither more

CAUTION: All combustion air must be drawn from
the air outside of the building; the mechanical equip­ment room must communicate directly with the
outdoors.

Canadian Installations

Water Piping

General

The heater should be located so that any water leaks
will not cause damage to the adjacent area or struc­tures.

Relief Valve Piping

than 18 in. (450 mm) nor less than 6 in. (150 mm)
above the floor level. The duct can also "Goose
Neck" through the roof. The duct is preferred
straight down 18” from floor, but do not place near
piping. This air supply opening requirement shall
be in addition to the air opening for ventilation air
required in (1).

3. For heaters not using a barometric damper in the
vent system, and when air supply is provided by
natural air flow from outdoors for a power burner
and there is no draft regulator, drafthood or similar
flue gas dilution device installed in the same
space, in addition to the opening for ventilation air
required in (1), there shall be a permanent air sup­ply opening(s) having a total cross-sectional area
of not less than 1 sq. in. for each 30,000 BTUH (70
sq. mm per kW) of total rated input of the burn­er(s), and the location of the opening(s) shall not
interfere with the intended purpose of the open­ing(s) for ventilation air referred to (1). This
opening(s) can be ducted to a point neither more
than 18 in. (450 mm) nor less than 6 in. (150 mm)
above the floor level. The duct can also "Goose
Neck" through the roof. The duct is preferred to be
straight down 18” from floor, but do not place near
piping.

4. Refer to the latest version of the B149 for addition­al information.

CAUTION: This heater requires forced water
circulation when the burner is operating. See Table F
and Table G for minimum and maximum flow rates
and water pump selection. The pump must be
interlocked with the heater to prevent heater
operation without water circulation.

WARNING: Pressure relief valve discharge piping
must be piped near the floor and close to a drain to
eliminate the potential of severe burns. Do not pipe
to any area where freezing could occur. Refer to
local codes.

Btu per hr (11 cm2per kW) of total input rating
of all equipment in the enclosure.

2. One permanent opening, commencing within 12
in. (30 cm) of the top of the enclosure, shall be
permitted where the equipment has clearances of
at least 1 in. (2.5 cm) from the sides and back and
6 in. (16 cm) from the front of the appliance. The
opening shall directly communicate with the out­doors or shall communicate through a vertical or
horizontal duct to the outdoors or spaces (crawl or
attic) that freely communicate with the outdoors,
and shall have a minimum free area of:

a. 1 sq in. per 3000 Btu per hr (7 cm

2

per kW) of
the total input rating of all equipment located in
the enclosure, and

b. Not less than the sum of the areas of all vent

connectors in the confined space.

13

Low Temperature System

Heater requires minimum inlet temperature of 105°F.
Consult the following sections for piping details.

Temperature & Pressure Gauge

The temperature and pressure gauge is factory­mounted in the in/out header.

Hydronic Heating

Pump Selection

In order to ensure proper performance of your boiler
system, you must install a properly sized pump.
Raypak recommends using a 20°F Delta T as design
Delta T. (Delta T is the temperature difference between
the inlet and outlet water when the heater is firing at
full rate). If a Delta T larger than 20°F is necessary,
see Table F for minimum flow rate requirements.

Pressure Drop in Feet of Head
Feedwater Regulator

Raypak recommends that a feedwater regulator be
installed and set at 12 PSIG minimum pressure at the
highest point of system. Install a check valve or back
flow device upstream of the regulator, with a manual
shut off valve as required by local codes.

Model

No.

10°F ΔT 20°F ΔT 30°F ΔT Min. Flow Max. Flow

gpm ΔP (ft) gpm ΔP (ft) gpm ΔP (ft) gpm ΔP (ft) ΔT gpm ΔP (ft) ΔT

122 20 2.5 10 <1.0 10* <1.0 20 30 5.3 7

162 27 4.5 13 1.10 10 <1.0 27 30 5.4 9

202 34 7.2 17 1.85 11 <1.0 10 <1.0 34 30 5.5 11

242 40 10.0 20 2.65 14 1.3 10 <1.0 40 44 11.8 9

322 27 4.70 18 2.2 14 1.4 40 44 12.2 12

Table F: Heater Rates of Flow and Pressure Drops

* Flow switch (when used) will not activate at less than 12 gpm.
NOTE: Basis for minimum flow - 10 gpm or 40° Delta T
maximum flow - 44 gpm, except for 1.25” header.

Hydrostatic Test

Unlike many other types of heaters, Raypak heaters
do not require hydrostatic testing prior to being placed
in operation. The heat exchanger has already been
factory-tested and is rated for 160 PSI maximum oper­ating pressure. However, Raypak does recommend
hydrostatically testing the piping connections to the
heater and the rest of the system prior to operation.
This is particularly true for hydronic systems using
expensive glycol-based antifreeze. Raypak recom­mends conducting the hydrostatic test before
connecting gas piping or electrical supply.

Leaks must be repaired at once to prevent damage to
the heater. NEVER use petroleum-based stop-leak
compounds.

1. Connect fill water supply. Fill heater with water (be
sure bleed valve is open). When water flows from
bleed valve, shut off water. Close bleed valve.
Carefully fill the rest of the system, being sure to
eliminate any entrapped air by using high point
vents. Close feed valve. Test at standard operating
pressure for at least 24 hours.

2. Make sure constant gauge pressure has been
maintained throughout test.

3. Check for leaks. Repair if found.

14

 

Fig. 9: Single Boiler—Low Temperature Application (Heat Pump) Primary/Secondary Piping

Fig. 10: Dual Boiler—Primary/Secondary Piping

   