Raypak 399B-2339B User Manual
INSTALLATION & OPERATING
INSTRUCTIONS
CATALOG NO. 1000.60A Effective: 01-06-09 Replaces: 09-28-07 P/N 241330 Rev. 2
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 399B–2339B
Types H & WH
L
W
2
Rev. 2 reflects the following: Changes to: Paragraph one of the Stacking section on page 9; Table G on page 16; Table H
on page 18; Fig. 19 on page 22; Fig. 20–22 on page 23; Fig. 24 on page 24; the Wiring Diagrams on pages 39 and 40. The
addition of: A wiring diagram note on page 38.
WARNINGS 4
BEFORE INSTALLATION 5
Product Receipt 5
Model Identification 5
Ratings and Certifications 5
Installations at Elevation 5
Component Locations 6
General Information 7
GENERAL SAFETY 8
Time/Temperature Relationships in
Scalds 8
INSTALLATION 9
Installation Codes 9
Equipment Base 9
Stacking 9
Clearances 11
Combustion and Ventilation Air 12
Conventional Combustion Air Supply 12
Water Piping 14
Hydronic Heating 16
Gas Supply 18
Electrical Power Connections 21
Field Wiring Connection 22
Venting 25
Changing the Flue Outlet 27
Venting Installation Tips 27
Venting Configurations 28
Outdoor Installation 32
Controls 32
Heater Sequence of Operation 33
Wiring Diagrams 39
START-UP 41
Pre Start-up 41
Start-Up 42
OPERATION 45
Lighting Instructions 45
To Turn Off Gas To Appliance 45
TROUBLESHOOTING 46
MAINTENANCE 47
Suggested Minimum
Maintenance Schedule 47
Preventative Maintenance Schedule 47
APPENDIX 49
Inside Air Contamination 49
WARRANTY 50
START-UP CHECKLIST 51
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
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 Delta Limited
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 gas supplier.
If, after reviewing this manual, you still have questions
which this manual does not answer, please contact the
manufacturer or your local Raypak representative.
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. 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 and 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 rating plate located on
the lower right outside jacket of the heater. The model
number will have the form H8 1259B or similar
depending on the heater size and configuration. The
letter(s) in the first group of characters identifies the
application (H = Hydronic Heating, WH = Domestic
Hot Water (DHW)). The number which fol-lows identifies the firing mode (1 or 4 = on-off, 3 = 2-stage, 8 =
3-stage and 9 = 4-stage). The second group of characters identifies the size of the heater (four numbers
representing the approximate MBTUH input), and,
where applicable, a letter, indicating the manufacturing
series.
Ratings and Certifications
Standards:
• ANSI Z21.13 · CSA 4.9 - latest edition, Gas-Fired
Hot Water Boilers
• CAN 3.1 - latest edition, Industrial and
Commercial Gas-Fired Package Boilers
• ANSI Z21.10.3 · CSA 4.3 - latest edition Gas
Water Heaters
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 5,000 ft elevation
without de-rating. Consult the factory for installations
at altitudes over 5,000 ft above sea level.
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
OPTIONAL FLUE
CONNECTION
General Information
Table A: Basic Data
Table B: Manifold Data
Model
No.
Quantity of Vent Size (in.)
Burners Gas Valves Blowers Flue Intake
399B 8 1 1 6 6
499B 10 2 1 6 6
649B 13 2 1 8 6
749B 15 2 1 8 6
899B 18 3 1 8 6
989B 11 2 2 10 10
1259B 14 3 2 12 10
1529B 17 4 2 12 10
1799B 20 4 2 14 10
1999B 23 5 3 14 10
2069B 23 5 3 14 10
2339B 26 5 3 16 10
Model
No.
Burners per Valve Stages % Fire at Stage
1 1A 2 3 4 1 2 3 4 1 2 3 4
399B 8 1 100
499B 5 5 1 1, 2 50 100
649B 7 6 1 1, 2 54 100
749B 8 7 1 1, 2 53 100
899B 6 6 6 1, 2 1, 2, 3 66 100
989B 6 5 1 1, 2 54 100
1259B 5 3 6 1 1, 2 1, 2, 3 36 57 100
1529B 6 4 4 3 1 1, 2 1, 2, 3 1, 2, 3, 4 35 59 82 100
1799B 6 4 5 5 1 1, 2 1, 2, 3 1, 2, 3, 4 30 50 75 100
1999B 4 5 5 5 4 1, 1A 1, 1A, 2 1, 1A, 2, 3 1, 1A, 2, 3, 4 39 61 83 100
2069B 4 5 5 5 4 1, 1A 1, 1A, 2 1, 1A, 2, 3 1, 1A, 2, 3, 4 39 61 83 100
2339B 5 6 5 5 5 1, 1A 1, 1A, 2 1, 1A, 2, 3 1, 1A, 2, 3, 4 42 62 81 100
7
GENERAL SAFETY
To meet commercial hot water use needs, the high
limit safety control on this water heater is adjustable up
to 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/NFPA 54 –
latest edition (NFGC)
• National Electrical Code, ANSI/NFPA 70 - latest
edition (NEC)
• Standard for Controls and Safety Devices for
Automatically Fired Boilers, ANSI/ASME CSD-1,
when required (CSD-1)
• For Canada only: CAN/CGA B149 Installation
Code (B149) and CSA C22.1 C.E.C. Part 1
(C22.1)
The temperature of the water in the heater can be regulated by using the temperature controller. To comply
with safety regulations, the temperature controller 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 controller and turn the wheel to the
desired setting (See Fig. 4.).
CAUTION: Hotter water increases the risk of scalding! There is a hot water scald potential if the
thermostat is set too high.
Fig. 4: 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.
Stacking
Delta Limited units can be stacked two units high with
an optional stacking rack. A stacking kit is available
from Raypak for this type of installation.
CAUTION: The heaters should be located in an
area where water leakage will not result in damage
to the area adjacent to the appliances 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.
Fig. 5: Typical Stacked Installation
9
REQUIRES OPTIONAL VENT TEE.
REQUIRES OPTIONAL VENT TEE IF VENTED OUT BACK
OF HEATER.
Fig. 6: Minimum Clearances from Vent/Air Inlet Terminations – Indoor and Outdoor Installations
Table D: Vent/Air Inlet Termination Clearances
10
U.S. Installations
Clearance above grade, veranda, porch,
A
deck, or balcony
Clearance to window or door that may be
B
opened
4 ft (1.2m) below or to side
1 ft (30 cm) 1 ft (30 cm)
of opening; 1 foot (30 cm)
above opening
1
Canadian Installations
3 ft (91 cm)
2
C Clearance to permanently closed window **
Vertical clearance to ventilated soffit located
above the terminal within a horizontal dis-
D
tance of 2 ft (61cm) from the centerline of the
5 ft (1.5m) *
terminal
E Clearance to unventilated soffit **
F Clearance to outside corner **
G Clearance to inside corner 6 ft (1.83m) *
Clearance to each side of center line ex-
H
tended above meter/regulator assembly
*
3 ft (91 cm) within a height
15 ft above the me-
ter/regulator assembly
I Clearance to service regulator vent outlet * 6 ft (1.83m)
Clearance to non-mechanical air supply inlet
to building or the combustion air inlet to any
J
other appliance
K Clearance to mechanical air supply inlet
Clearance above paved sidewalk or paved
L
driveway located on public property
Clearance under veranda, porch, deck or
M
balcony
1
In accordance with the current ANSI Z223.1/NFPA 54 National Fuel Gas Code
2
In accordance with the current CAN/CGA-B149 Installation Codes
t Vent terminal shall not terminate directly above sidewalk or paved driveway located between 2 single family dwellings that serves
both dwellings
TT Permitted only if veranda, porc h, deck, or balcony is fully open on a minimum of two sides beneath the floor and top of terminal and
underside of ver anda, porch, deck or balcony is greater than 1 ft (30cm)
* Clearances in accordance with local installation codes and the requirements of the gas supplier
4 ft (1.2m) below or to side
of opening; 1 ft (30 cm)
above opening
3 ft (91 cm) above if within
10 ft (3m) horizontally
7 ft (2.13m)
* 12 in. (30 cm) TT
3 ft (91 cm)
6 ft (1.83m)
7 ft (2.13m) t
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.).
Clearances
Indoor Installations
Table E: Clearances – Indoor Installations
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 12 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.
Outdoor Installations
These heaters are design-certified for outdoor installation. Heaters must not be installed under an overhang
that is less than 3 ft from the top of the heater. Three
sides must be open in the area under the overhang.
Roof water drainage must be diverted away from
heaters installed under overhangs.
Table F: Clearances – Outdoor Installations
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 jobsite.
* DO NOT install on carpeting.
11
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
Heater
Side
Min. Clearance
from Combustible
Surfaces
Recommended
Service
Clearance
TOP VIEW
FRONT VIEW
Venting not shown for clarity. Heater must be vented
per instructions in this manual
Front Open 24”
Rear 12” 24”
Water Side 36” 36”
Other Side 36” 36”
Top Unobstructed 36”
Vent N/A N/A
three or four sheet metal screws (not supplied) equally distributed around the circumference of the duct. All
ducting should be self-supported. The filter housing is
not designed to support the air duct.
Conventional Combustion Air
Supply
U.S. Installations
All Air from Inside the Building
The confined space shall be provided with TWO per-
manent openings communicating directly with an
additional room(s) of sufficient volume so that the combined volume of all spaces meets the criteria for a
room large in comparison (NFGC). The total input of all
gas utilization equipment installed in the combined
CAUTION: This type of installation is
recommended if damaging airborne contaminants
are or will be present in the heater area. See the
Appendix regarding air contamination.
Fig. 8: Minimum Clearances from Combustible
Surfaces – Outdoor Installations
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.
Reversing Air Filter
Follow these instructions to change the air duct connection from the left-hand side (standard) to the
right-hand side:
1. Remove the four screws and the dust cover from
the right-hand side of the heater.
2. Remove the four screws and the air filter bracket
from the left-hand side of the heater.
3. Reverse the components and reattach in the new
location, making sure that the air filter locking
bracket is on the bottom. (The air filter locking
bracket is reversible.)
Direct-Ducted Combustion Air
In certain applications it may be desirable to duct the
combustion air directly to the heater. This should be
done with PVC, CPVC or single-wall galvanized ducting. The duct will attach directly to the collar on the air
filter housing located on the side of the heater. The
ducting is attached to the air filter housing collar using
CAUTION: Combustion air must not be
contaminated by corrosive chemical fumes which
can damage the heater and void the warranty. (See
the Appendix.)
NOTE: It is recommended that the intake vent be
insulated to minimize sweating.
NOTE: Use of the heater in construction areas
where fine particulate matter, such as concrete or
dry-wall dust, is present may result in damage to the
heater that is not covered by the warranty. If
operated in a construction environment, a clean
source of combustion air must be provided directly to
the heater.
12
space shall be considered in making this determination. Each opening shall have a minimum free area of
1 in.
2
per 1,000 BTUH (2,225 mm2per 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. (305 mm) of the
top, and one opening shall commence within 12 in.
(305 mm) of the bottom of the enclosure. The minimum dimension of air openings shall be not less than
3 in. (76 mm) in any direction.
All Air from Outdoors
The confined space shall communicate with the outdoors in accordance with one of the methods below.
The minimum dimension of air openings shall not be
less than 3 in. (76 mm) in any direction. Where ducts
are used, they shall be of the same cross-sectional
area as the net free area of the openings to which they
connect.
1. Two permanent openings, one commencing
within 12 in. (305 mm) of the top, and one commencing within 12 in. (305 mm) 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 in.
2
per
4,000 BTUH (550 mm2per 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 in.
2
per 2,000
BTUH (1,100 mm2per kW) of total input rating of all equipment in the enclosure.
2. One permanent opening, commencing within 12
in. (305 mm) of the top of the enclosure, shall be
permitted where the equipment has clearances of
at least 1 in. (25 mm) from the sides and back and
6 in. (152 mm) 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 that
freely communicate with the outdoors, and shall
have a minimum free area of:
a. 1 in.
2
per 3,000 BTUH (740 mm2per 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.
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 the outdoors. The total cross-sectional area of
such an opening(s) shall be at least 10% of the
area required in 2. and 3. (below), but in no case
shall the cross-sectional area be less than 10 in.
2
(65 cm2).
2. For heaters using a barometric damper in the vent
system there shall be a permanent air supply
opening(s) having a cross section area of not less
than 1 in.
2
per 7,000 BTUH (320 mm2per kW) up
to and including 1 million BTUH, plus 1 in.
2
per
14,000 BTUH (160 mm
2
per kW) in excess of 1
million BTUH. This opening(s) shall be either
located at or ducted to a point not more than 18 in.
(450 mm) nor less than 6 in. (152 mm) above the
floor level. The duct can also “goose neck” through
the roof. The duct is preferred to be straight down
and terminated 18 in. (450 mm) from the floor, but
not near piping. This air supply opening requirement shall be in addition to the air opening for
ventilation air required in 1. (above).
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
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
WARNING: Care must be taken to ensure that the
equipment room is not under negative pressure
conditions or that the equipment is not commonvented with other gas-fired appliances.
13
5. Remove all plumbing fittings to the header. This
will include both inlet and outlet water pipe unions
and the pressure relief valve and drain piping.
6. Remove limits, control bulbs and/or thermocouples.
7. Remove the six (or 8) flange nuts and the in/out
header from the left-hand side.
8. Remove the six (or 8) flange nuts and the return
header from the right-hand side.
9. Remove the header stud bolts from each tube
sheet.
10. Reverse the headers and stud bolts to the new
location.
11. Install NEW red beveled O-rings flush against both
tube sheets with the bevel facing outward.
12. Push the header firmly against the O-rings. Install
and tighten the flange nuts onto the stud bolts until
finger tight.
13. Slowly tighten the flange nuts, starting from the
center nut (number 1) in Fig. 9 and working sequentially around the header as indicated. Torque
all nuts to 25 ft/lb. DO NOT OVER-TIGHTEN.
14. Re-route the capillary(s), wiring etc. to the new
location, adding thermal paste and shim to the
capillary well.
Relief Valve Piping
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.
Hydrostatic Test
Unlike many types of heaters, this heater does not require hydrostatic testing prior to being placed in
operation. The heat exchanger has already been factory-tested and is rated for 160 psi operating pressure.
However, Raypak does recommend hydrostatic testing of the piping connections to the heater and the rest
of the system prior to operation. This is particularly
true for hydronic systems using expensive glycolbased anti-freeze. Raypak recommends conducting
of not less than 1 in.2for each 30,000 BTUH mm
2
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 in (1). This opening(s)
can be ducted to a point not more than 18 in. (450
mm) nor less than 6 in. (152 mm) above the floor
level. The duct can also “goose neck” through the
roof. The duct is preferred to be straight down 18
in. (450 mm) from the floor, but not near piping.
4. Refer to B149 Installation code for additional information.
Water Piping
General
The heater should be located so that any water leaks
will not cause damage to the adjacent area or structures.
Reversing Water Connections
Follow these instructions to change the water connections from the left-hand side (standard) to the
right-hand side.
1. Disconnect all electrical power from the heater (if
applicable).
2. Label all electrical connections and conduit lines.
This may include the flow switch, low water cut-off
probe and/or pump.
3. Disconnect or isolate the main gas pipe from the
heater (if applicable).
4. Remove both in/out and return header access
panels by removing all sheet metal screws.
CAUTION: This heater requires forced water
circulation when the burner is operating. See Table
G and Table H 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.
NOTE: Minimum pipe size for in/out connections is
2
1
⁄2 in (2 in. for 399B–899B). Verify proper flow rates
and ΔT as instructed in this manual.
14
Fig. 9: Torque Sequence
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.
To perform hydrostatic test:
1. Connect fill water supply. With bleed valve open,
fill heater with water. When water flows from bleed
valve, shut off water. Close bleed valve. Carefully
fill the rest of the system, making 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.
Cold Water Operation
A heater operated with an inlet temperature of less
than 105ºF (41ºC) must have a manual bypass or an
approved low-temperature operation system to prevent problems with condensation. A manual bypass,
shown in Fig. 15, must be piped into the system at the
time of installation. This piping is like a primary/secondary boiler installation with a bypass acting
as the secondary boiler piping. Raypak strongly recommends that thermometer(s) be placed into the
heater piping next to the in/out header to facilitate temperature adjustment. Inlet water temperatures below
105ºF (41ºC) can excessively cool the products of
combustion, resulting in condensation on the heat
exchanger and in the flue.
CAUTION: Damaging internal condensation may
occur if the heater inlet water temperature does not
exceed 105ºF (41ºC) within 7 minutes of start-up.
Failure to exceed 105ºF (41ºC) within 7 minutes may
result in the premature failure of the hot surface igniter, remote flame sensor, burners and heat exchanger.
It can cause operational problems, bad combustion,
sooting, flue gas spillage and reduced service life of
the vent system. The bypass allows part of the heater
discharge water to be mixed with the cooler heater
return water to increase the heater inlet temperature
above 105ºF (41ºC). This precautionary measure
should prevent the products of combustion from condensing in most installations. Warranty claims will be
denied when condensation occurs.
Cold water operation issues are applicable to both
cold water start and cold water run applications. Cold
water operation for 7 minutes or less on start-up is
acceptable. Where cold water starts will last longer
than 7 minutes or where cold water operation is continuous, provisions must be made to mix higher
temperature outlet water with the colder inlet water
and thereby raise the inlet temperature to at least
105ºF (41ºC) within the 7-minute time limit.
Cold Water Starts
Frequent (more than once a week) cold water starts,
wherein the inlet water temperature remains below
105ºF (41ºC) for more than 7 minutes, must have cold
water start protection. Known protection methods consist of mixing heated outlet water with the inlet water
with a bypass to raise the inlet to 105ºF (41ºC) or higher. Once the system is heated up and has return water
temperatures of 105ºF (41ºC) or higher, the mixing of
outlet water with inlet water is no longer needed and
the bypass can be shut off. If the bypass is not shut off
Models 399B–899B
Models 989B–2339B
15
Cold Water Run
Cold water run differs from cold water start in that the
system water entering the heater remains below 105ºF
(41ºC) continuously. Typically, this is the case in swimming pool heating and water source heat pump
applications as well as some others. If the system
water is kept in a narrow temperature range, a permanent manual bypass can be employed and manually
adjusted to achieve an inlet temperature of 105ºF
(41ºC) or higher. An injector pump arrangement may
also be utilized to keep the heater loop at or above
105ºF (41ºC). An injector pump approach has the
added value of being able to adjust to changes in the
system water coming back to the heater take-off.
Table G: Heater Rates of Flow and Pressure Drops
Notes: 1. Basis for minimum flow: Models 399–899, 20 gpm or 40°F ΔT. Models 989–2339, 30 gpm or 40°F ΔT.
Basis for maximum flow: Models 399–899, 90 gpm. Models 989–2339, 132 gpm.
2. Flow switch will not operate if flow is less than 20 gpm.
as the system heats up, the outlet temperature may
continue to climb and actuate the high limit, thereby
shutting down the heater. Thus an automatic valve
system, such as a three-way proportional valve or a
modulating two-way valve to control the bypass,
should be utilized.
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 heater
system, you must install a correctly sized pump. Raypak recommends using a 20°F ΔT as design ΔT. (ΔT is
the temperature difference between the inlet and outlet water when the heater is firing at full rate). If a ΔT
of larger than 20°F is necessary, see Table G and
Table H for flow rate requirements.
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
399B 67 5.5 34 1.4 22 0.6 20 0.5 34 90 10.0 7
499B 84 9.1 42 2.3 28 1.1 21 0.6 40 90 10.4 9
649B 55 4.1 36 1.8 27 1.1 40 90 10.8 12
749B 63 5.7 42 2.6 32 1.5 40 90 11.3 14
899B 76 8.3 50 3.8 38 2.2 40 90 11.7 17
989B 83 5.2 55 2.3 42 1.3 40 132 13.1 13
1259B 106 9.6 71 4.3 53 2.4 40 132 14.8 16
1529B 129 15.7 86 7.1 64 4.0 40 132 16.5 19
1799B 101 10.7 76 6.0 40 132 18.3 23
1999B 112 13.8 84 7.9 40 132 19.0 25
2069B 116 14.8 87 8.5 40 132 19.0 26
2339B 132 21.4 98 12.1 40 132 21.4 30
16
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