Rheem Raypak Delta Limited 399B User manual

1
FOR YOUR SAFETY: Do not store or use gasoline or other ammable 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 re.
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 re department.
Installation and service must be performed by a qualied 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
AWARNING: If these instructions are not followed exactly, a re or explosion may result
causing property damage, personal injury or death.
INSTALLATION AND
OPERATION MANUAL
Effective: 07-28-23
Replaces: 06-30-23
P/N: 241330 Rev. 8
SCAN WITH QR EQUIPPED SMART
DEVICE FOR ONLINE MANUAL.
SEE PAGE 64 FOR QR CODE.
NOTICE

2
Revision 8 reects the following changes:
Added two warnings regarding carbon monoxide to “Warnings” section per ANSI Z21.13_22 Chapters 4.33.1 b and 4.34 i.

3
WARNINGS 4
BEFORE INSTALLATION 5
Product Receipt 5
Model Identication 5
Ratings and Certications 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 Congurations 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 O󰀨 Gas To Appliance 45
TROUBLESHOOTING 46
MAINTENANCE 47
Suggested Minimum
Maintenance Schedule 47
Preventive Maintenance Schedule 47
APPENDIX 49
Inside Air Contamination 49
ILLUSTRATED PARTS LIST 50
QR CODE 64
WARRANTY 65
START-UP CHECKLIST 66
TABLE OF CONTENTS
THIS INSTALLATION MANUAL MAY NOT BE THE LATEST REVISION PRINTED AT THE TIME OF PRODUCT SHIPMENT. VISIT THE
RAYPAK WEBSITE TO VERIFY THE MANUAL DELIVERED WITH YOUR RAYPAK UNIT IS THE MOST UP-TO-DATE VERSION.

4
WARNINGS
Pay Attention to These Terms
ADANGER: Indicates the presence of immediate hazards which will cause severe
personal injury, death or substantial property damage if ignored.
AWARNING: Indicates the presence of hazards or unsafe practices which could cause
severe personal injury, death or substantial property damage if ignored.
ACAUTION: 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.
ADANGER: Make sure the gas on which the heater will operate
is the specied on the heater rating plate.
AWARNING: Should overheating occur or the gas supply valve
fail to shut, do not turn o󰀨 or disconnect the electrical supply to
the heater. Instead, shut o󰀨 the gas supply at a location external
to the heater.
EWARNING - CALIFORNIA PROPOSITION 65: This
product contains chemicals known to the State of California to
cause cancer, birth defects or other reproductive harm.
AWARNING: This unit contains refractory ceramic ber (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 classied 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
bers. When cleaning spills, use wet sweeping or High E󰀩ciency
Particulate Air (HEPA) ltered 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 certied
respiratory protection, to avoid inhalation of airborne dust and
airborne ber particles.
AWARNING: Do not use this heater if any part has been under
water. Immediately call a qualied service technician to inspect
the heater and to replace any part of the control system and any
gas control which has been under water.
AWARNING: To minimize the possibility of improper operation,
serious personal injury, re, or damage to the heater:
• Always keep the area around the heater free of combustible
materials, gasoline, and other ammable liquids and vapors.
• Heater should never be covered or have any blockage to the ow
of fresh air to the heater.
AWARNING: Risk of electrical shock. More than one disconnect
switch may be required to de-energize the equipment before
servicing.
AWARNING: For appliances that allow indoor installation
within a residential living space or home, the installer must verify
that at least one carbon monoxide alarm has been installed
within a residential living space or home following the alarm
manufacturer’s instructions and applicable local codes before
putting the appliance into operation.
AWARNING: For appliances that allow indoor installation within
a residential living space or home, note that this product burns
gas to produce heat. The appliance must be properly installed,
operated, and maintained to avoid exposure to appreciable levels
of carbon monoxide and the installer is required to conrm that at
least one carbon monoxide alarm is installed in the living space
before the appliance is put into operation. It is important for the
carbon monoxide alarms to be installed, maintained, and replaced
following the alarm manufacturer’s instructions and applicable
local codes.
ACAUTION: If this heater is to be installed above radiation
level, it must be provided with a low water cut-o󰀨 device at the
time of heater installation.
ACAUTION: Operation of this heater in low temperature
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.
WCAUTION: If this heater is to be installed in a negative or
positive pressure equipment room, there are special installation
requirements. Consult factory for details.

5
BEFORE
INSTALLATION
Raypak strongly recommends that this manual be re-
viewed 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 qualied 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 satised with the high quality and durability
of our equipment.
Product Receipt
On receipt of your heater it is suggested that you visu-
ally check for external damage to the shipping crate. If
the crate is damaged, make a note to that e󰀨ect 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 indicat-
ed on the Bill of Lading.
Claims for shortages and damages must be led 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 defec-
tive replacement parts will not be accepted and will be
replaced in kind only per Raypak’s standard warran-
ties.
Model Identication
The model identication 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 conguration. The
letter(s) in the rst group of characters identies the
application (H = Hydronic Heating, WH = Domestic
Hot Water (DHW)). The number which fol-lows iden-
ties the ring mode (1 or 4 = on-o󰀨, 3 = 2-stage, 8 =
3-stage and 9 = 4-stage). The second group of charac-
ters identies the size of the heater (four numbers
representing the approximate MBTUH input), and,
where applicable, a letter, indicating the manufacturing
series.
Ratings and Certications
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-certied 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.
AWARNING: Altering any Raypak pressure
vessel by installing replacement heat exchang-
ers, 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.
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.