Raypak 500 Specification sheet

Catalog No.: 3400.50-I
Effective: 12-01-00
Replaces: 05-01-00
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.
WARNING: Improper installation, adjustment, alteration, service or maintenance can cause property dam-
age, personal injury or loss of life. Refer to the user’s information manual provided with this boiler. Installation
and service must be performed by a qualified installer, service agency or the gas supplier.
FOR YOUR SAFETY
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.
This manual should be maintained in legible condition
and kept adjacent to the boiler or kept in a safe place
for future reference.
P/N 240723
OPERATING AND
INSTALLATION
INSTRUCTIONS
Models 500,750,1000
ADVANCED
DESIGN
BOILER
®

DANGER: Make sure the gas on which the boiler will operate is the same type as that specified on the
boiler model and 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 boiler. Instead, shut off the gas supply at a location external to the appliance.
WARNING: Do not use this boiler if any part has been under water. Immediately call a qualified service technician
to inspect the boiler and to replace any part of the control system and any gas control which has been
under water.
WARNING: To minimize the possibility of improper operation, serious personal injury, fire, or damage to the boiler,
never violate the following safety rules:
1. Always keep the area around the boiler free of combustible materials, gasoline, and other
flammable liquids and vapors.
2. Never cover the boiler, lean anything against it, store trash or debris near it, stand on it, or in
any way block the flow of fresh air to the boiler.
WARNING: More than one (1) supply source. This appliance has provisions to be connected to more than one (1)
supply source. To reduce the risk of electrical shock, disconnect all such connections before servicing.
WARNING: Risk of electrical shock. More than one (1) disconnect switch may be required to de-energize the
equipment before servicing.
CAUTION: Operation of this boiler on low temperature systems requires special piping to insure correct
operation. Consult Sections E, F or G for piping details.
CAUTION: If this boiler is to be installed above radiation level, it must be provided with a low water cutoff device
at the time of boiler installation.
CAUTION: This boiler requires forced water circulation when the burner is operating. See sections D for minimum
and maximum flow rates. Severe damage will occur if the boiler is operated without proper water flow
circulation.
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TABLE OF CONTENTS
PAGE
NO.
4 SECTION A: BEFORE INSTALLING THE BOILER
7 SECTION B: BOILER INSTALLATION
10 SECTION C: COMBUSTION AND VENTILATION AIR
12 SECTION D: WATER PIPING - GENERAL
13 SECTION E: HYDRONIC HEATING PIPING
17 SECTION F: DOMESTIC HOT WATER PIPING
19 SECTION G: POOL HEATING
22 SECTION H: GAS SUPPLY CONNECTIONS
24 SECTION I: ELECTRICAL POWER CONNECTIONS
27 SECTION J: VENTING CONNECTIONS
49 SECTION K: CONDENSATE DRAIN
50 SECTION L: CONTROLS
56 SECTION M: GENERAL SAFETY PRECAUTIONS
57 SECTION N: PRE-START-UP
59 SECTION O: ADB INITIAL START-UP
(MANUFACTURERS CERTIFIED PERSONNEL ONLY)
62 SECTION P: POST START-UP CHECK
63 SECTION Q: OPERATION
64 SECTION R: MAINTENANCE
66 SECTION S: CONNECTING CONDENSING HEAT EXCHANGER (CHX)
67 APPENDIXA: COMBUSTION AIR CONTAMINATION
68 ILLUSTRATED PARTS LIST

Pay attention to these terms:
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.
NOTICE indicates special instructions on installation, operation, or maintenance which are important but
not related to personal injury hazards.
SECTION A: BEFORE INSTALLING THE BOILER
Raypak strongly recommends that this manual be reviewed thoroughly before installing your Raypak boiler. Factory
warranty does not apply to boilers that have been improperly installed or operated. 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 factory 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 product 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 boiler from the shipping
packaging. Report any damage to the carrier immediately.
On occasion, some items will be 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 stocking charge.
When ordering parts, you must specify the Model and Serial Number of the boiler. When ordering under warranty condi-
tions, 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.
4

MODEL IDENTIFICATION
The model identification number and boiler serial number are found on the boiler data plate located on the left
inside jacket of the boiler. The model number will have the form H4 0500A ADB or similar depending on the
boiler size and configuration. The first character of the model number identifies application (H = Hydronic
Heating System, W = Hot Water Supply System, P = Pool Application). The second character identifies the
firing mode (4 = On-Off firing). The next four places identify the input of the boiler in 1,000s of BTUH 0500 =
500,000 BTUH). The remaining suffix identifies the control, ignition, and construction configuration. The last
three characters of the model number identifies the model type (ADB = Advanced Design Boiler).
RATINGS AND CERTIFICATION
All Raypak boilers are National Board Approved, design certified and tested under the applicable American
National Standard/CSA Standard for USA and Canada. Each boiler is constructed in accordance with Section IV
of the American Society of Mechanical Engineers (ASME) Boiler Pressure Vessel Code and bears the ASME
stamp. This boiler complies with the latest edition of ASHRAE 90.1 Standard.
Altering any RAYPAK pressure vessel by installing replacement heat-exchangers, tube bundle headers, or any
other ASME part not manufactured and/or approved by RAYPAK will instantly void the ASME, and agency
listings and any RAYPAK warranty on the vessel. Altering the ASME, agency ratings of the vessel also violates
national, state, and local approval codes. The terms "boiler" and "heater" are used interchangeably in this
manual.
No derate is required for altitudes up to 7000 feet. Rated inputs, at sea level settings, are suitable for up to 5000
feet elevation. At altitudes between 5000 and 7000 feet, rated inputs are achieved with pressure settings
adjustment. Consult the factory for installations at altitudes in excess of 7000 feet.
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Figure A-1
ADVANCED DESIGN BOILER COMPONENT LOCATIONS

SECTION B: BOILER INSTALLATION
INSTALLATION CODES
Installations must follow these codes:
· Local, state, provincial, and national codes, laws, regulations and ordinances.
· National Fuel Gas Code (NFGC), ANSI Z223.1- latest edition.
· National Electrical Code (NEC), ANSI/NFPA 70 - latest edition.
· Standard for Controls and Safety Devices for Automatically Fired Boilers, ANSI/ASME CSD-1, when required.
· For Canada only: CAN/CGA B149.1 and .2 Installation Code and C.S.A. C22. 1 C.E.C. Part 1.
EQUIPMENT BASE
The boiler should be mounted on a level, structurally sound surface. The boiler is approved for and can be installed 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 inches above the floor.
CAUTION: The boiler 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.
In addition, the boiler shall be installed such that the gas ignition system components are protected from water (dripping,
spraying, rain, etc.) during appliance operation and service (circulator replacement, control replacement, etc.).
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8
CLEARANCES
TABLE 1
MINIMUM CLEARANCES FROM COMBUSTIBLE SURFACES
(INDOOR ALCOVE INSTALLATIONS)
Boiler Size
Boiler Side 500 750 1000
Floor See Note 1.
Rear 1” 1" 1"
Right 12” (Water side) 12" (Water side) 12" (Water side)
Left 1” 1” 1”
Top 0” 0” 0”
Vent 1” 1” 1”
Note 1. Do not install on carpeting.
Figure B-1
MINIMUM CLEARANCES FROM COMBUSTIBLE SURFACES AND FOR EASY SERVICING

9
Raypak Advanced Design Boilers are design certified by AGA/CGA for outdoor installation. Roof water drainage must be
diverted away from boilers installed under overhangs.
TABLE 2
OUTDOOR INSTALLATION MINIMUM CLEARANCES
Boiler Size
Boiler Side 500 750 1000
Rear 6" 6" 6"
Right 36” (Water side) 36" (Water side) 36" (Water side)
Left 36" 36" 36"
Top 0" 0" 0"
Vent 1" 1" 1"
WARNING: Combustion air inlet (blower air inlet) should have 6" minimum clearance from any obstruction, i.e. walls or
other appliances.

SECTION C: COMBUSTION AND VENTILATION AIR
COMBUSTION AND VENTILATION AIR (Indoor Units)
The boiler must be supplied with sufficient quantities of non-contaminated air to support proper combustion and equip-
ment ventilation. Combustion air can be supplied via conventional venting, where combustion air is drawn from the area
immediately surrounding the boiler, or via direct vent, where combustion air is drawn directly from outside. All installa-
tions must comply with the requirements of NFGC for U.S., CAN/CGA B 149.1 and .2 for Canada, and all local codes.
DIRECT COMBUSTION AIR
If outside air is drawn through a vent pipe directly to the unit for combustion:
1. Install combustion air direct vent in accordance with Section J of this manual.
2. Provide for adequate ventillation of the space occupied by the boiler(s) by an opening(s) for ventillation air at the
highest practical point communicating with the outdoors. The total cross sectional area shall be at least one (1)
square inch of free area per 20,000 BTUH 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
one (1) square inch of free area per 10,000 BTUH 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 freeze-up, Raypak highly recommends the installation of a motorized
sealed damper to prevent the circulation of cold air through the boiler during the non-operating hours.
CONVENTIONAL COMBUSTION AIR SUPPLY (FOR U.S. INSTALLATION ONLY)
All Air from Inside the Building. If all combustion air is drawn from the air inside the building (the mechanical
equipment room does not receive air from outside):
1. The mechanical equipment room must be provided with two permanent openings communicating directly
with additional room(s) of sufficient volume so that the combined volume of all spaces meets the criteria for
an unconfined space. (An unconfined space is defined as a space whose volume is more than 50 cubic feet per
1,000 BTUH of the aggregate input rating of all appliances installed in that space.)
2. Each opening must have a minimum free area of one (1) square inch per 1,000 BTUH of the total input
rating of all gas utilization equipment in the mechanical equipment room.
3. One opening must commence within twelve (12) inches of the top, and one opening must commence within
twelve (12) inches of the bottom of the room.
4. Refer to NFGC, Part 5, for additional information.
All Air from Outdoors. If all combustion air is drawn from the air outside the building (the mechanical equipment room
directly communicates with the outdoors), either of the following two methods can be used:
Method 1:
1. The mechanical equipment room must be provided with two permanent openings, one commencing within
(twelve) 12 inches of the top, and one commencing within twelve (12) inches of the bottom of the room.
2. The openings must communicate directly, or by ducts, with the outdoors.
3. Each opening must have a minimum free area of one (1) square inch per 4,000 BTUH of total input rating of all
equipment in the room when the opening is communicating directly with the outdoors or through vertical ducts. The
minimum free area required for horizontal ducts is one (1) square inch per 2,000 BTUH of total input rating to all the
equipment in the room.
4. Refer to NFGC, Part 5, for additional information.
Refer to Appendix Afor additional information about combustion air quality.
10

Method 2 (normally applied in cold climate regions):
1. The mechanical equipment room must be provided with at least one permanent opening, commencing within
12 inches of the top of the enclosure.
2. The opening must communicate directly or by ducts with outdoors.
3. The opening must have a minimum free area of 1 sq. in per 3000 BTUH of the total input rating of all
equipment in the room, or no less than the sum of the areas of all vent connectors in the confined space.
. Refer to the latest version of NFGC, part 5 for additional information.
WARNING: Do not use one permanent opening method (Method 2) if the equipment room is under negative
pressure condition or the equipment is common vented with other gas-fired appliances.
COMBUSTION AND VENTILATION AIR SUPPLY (FOR CANADA INSTALLATION)
CAUTION: All combustion air has to be drawn from the air outside the building (the mechanical equipment
room directly communicates with the outdoors).
1. Ventilation of the space occupied by the boiler 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 square inches (6500 square mm).
2. When air supply is provided by natural air flow from the outdoors for natural draft, partial fan assisted, fan-assisted
or power draft-assisted 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 than 18 inches (450 mm) nor less than 6 inches (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. When air supply is provided by natural air flow from outdoors for a power burner and there is no draft regulator, draft
hood 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 inches (450 mm) nor less than 6 inches (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 CAN/CGA-B149.1 and B149.2 for additional information.
11

SECTION D: WATER PIPING - GENERAL
The boiler should be located so that any water leaks will not cause damage to the adjacent area or structures.
All units should be plumbed in accordance with the appropriate diagram from Section E, F or G or per a suitable engineered
piping arrangement.
CAUTION: This boiler requires forced water circulation when the burner is operating. See Table D-1 for
minimum and maximum flow rates and water pump selection. The pump must be interlocked with the
boiler to prevent boiler operation without water circulation. See Figure L-2 Wiring Diagram and
Figure L-1.
RELIEFVALVE PIPING
WARNING: Pressure relief valve discharge piping must be piped near the floor close to a floor 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 other types of boilers, Raypak boilers do not require hydrostatic testing prior to being placed in operation.
The heat exchanger has already been factory-tested and is rated for 150 PSI operating pressure. However, Raypak does
recommend hydrostatically testing the piping connections to the boiler 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 boiler. NEVER use petroleum-based stop-leak compounds.
1. Connect fill water supply. Fill boiler 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.
LOW TEMPERATURE SYSTEM
Boiler requires minimum inlet temperature of 105°F. Consult sections E, F or G for piping details. (For Pool temperature
requirements, See Section G).
TEMPERATURE & PRESSURE GAUGE
The temperature and pressure gauge is factory-mounted in the inlet/outlet header.
Delta P Should include typical piping To/From a single tank as well as bypass piping.
NOTE: GPM flow rates limited by maximum acceptable velocity through heat exchanger tubes. May be
Table D-1 increased by 10% for closed heating systems. Pressure drop would increase by 21%.
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SECTION E: HYDRONIC HEATING PIPING
PUMP SELECTION
In order to insure 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
boiler is firing at full rate). If a Delta T larger than 20°F is necessary, the bypass must be installed and adjusted to insure
proper hydraulics through the boiler while still allowing minimum flow to satisfy the safety flow switch. See Table D-1 for flow
rate requirements.

Figure E-2a
SINGLE BOILER - PRIMARY/SECONDARY PIPING
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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.
PIPING - HEATING BOILERS
All high points should be vented. Purge valves and a bypass valve should be installed. A boiler installed above radiation
level must be provided with a low water cutoff device. The boiler, when used in connection with a refrigeration system,
must be installed so the chilled medium is piped in parallel with the boiler with appropriate valves to prevent the chilled
medium from entering the boiler.
The boiler piping system of a hot water heating boiler connected to heating coils located in air handling units where they
may be exposed to circulating refrigerated air, must be equipped with flow control valves or other automatic means to
prevent gravity circulation of the boiler water during the cooling cycle. It is highly recommended that the piping be insulated.
AIR-SEPARATION/EXPANSION TANK
All boilers should be equipped with a properly sized expansion tank with an air separation fitting as shown in the following
diagrams.
THREE-WAY VALVES
Valves designed to blend water temperatures or reduce water circulation through the boiler should not be used. Raypak
heaters are high recovery low mass heaters not subject to thermal shock. Raypak offers a full line of electric sequencers that
produce direct reset of boiler water temperature. Refer to the Controls Section in our Complete Catalog.

Figure E-2b
SINGLE BOILER - PRIMARY/SECONDARY PIPING WITH CHX
15
Figure E-3a
DUAL-BOILER PRIMARY/SECONDARY PIPING

16
Figure E-3b
DUAL BOILER -PRIMARY/SECONDARY PIPING WITH CHX
Figure E-4a
SINGLE BOILER - LOW TEMPERATURE APPLICATION (HEAT PUMP) PRIMARY/SECONDARY PIPING

SECTION F: DOMESTIC HOT WATER PIPING
When designing the water piping system for domestic water applications, water hardness should be considered. Table D-
1 indicates the suggested flow rates for soft, medium and hard water. Hardness is specified as grains per gallon.
TABLE F-1
DOMESTIC WATER HEATING BOILER
FLOW RATE REQUIREMENTS
Delta T = Temperature rise in °F GPM = Gallons per minute See Table D-1 for Pressure Drop
Figure F-1a
SINGLE BOILER DOMESTIC HOT WATER WITH ONE STORAGE TANK
17
Figure F-1b
SINGLE BOILER DOMESTIC HOT WATER WITH ONE STORAGE TANK AND CHX

18
Figure F-1bb
SINGLE BOILER DOMESTIC HOT WATER WITH ONE STORAGE TANK AND CHX (2 pump system)
Figure F-1c
SINGLE BOILER DOMESTIC HOT WATER WITH ONE STORAGE TANK, ONE PRE-HEAT TANK AND CHX

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SECTION G: POOL HEATING
CAUTION: Power to the heater should be interlocked with the main system pump to make sure the heater does not fire
without the main system pump in operation. Improper flow control can damage the heater. Uncontrolled
flow (too high) or restricted flow (too low) can seriously affect heater operation. Follow these instructions
to make sure your heater is properly installed.
The ADB unit is equipped with an external pump and bypass arrangement that blends outlet water with the inlet to increase
the inlet water temperature, thereby reducing the likelihood of condensation forming on the heat exchanger. The pump also
serves to circulate water through the heater form the main system piping.
To complete the installation of the pool heater, the pool thermostat needs to be installed in the main return water line. This
will insure that the heater will be energized at the right time. If the main water line is too far away from the heater and the
capillary bulb will not reach it, locate the pool thermostat adjacent to the main line and run wires back to the heater. See Figure
G1-a and Figure G2-b.
Adjustment of the bypass valve is critical to proper operation of the heater. The bypass valve should be adjusted to achieve
an inlet water temperature in the range of 90°F to 100°F and an outlet water temperature between 120°F and 130°F. When
starting with a cold pool, make initial adjustments. Make final adjustments when pool water approaches desired temperature.
Refer to flow rate chart below:
AUTOMATIC CHLORINATORSAND CHEMICAL FEEDERS
All chemicals must be introduced and completely diluted into the pool or spa water before being circulated through the
heater. Do not place chlorine tablets or bromine sticks in the skimmer. High chemical concentrations will result when the
pump is not running (i.e. overnight).
Chlorinators must feed downstream of the heater and have an anti-siphoning device to prevent chemical backup into the
heater when the pump is shut off.
NOTE: High chemical concentrates from feeders and chlorinators that are out of adjustment will cause very rapid
corrosion to the heat exchanger in the heater. Such damage is not covered under the warranty.
WINTERIZINGYOUR HEATER
When heaters installed outdoors in freezing climate areas are to be shut down for the winter, please observe the
following step-by-step procedure:
1. Turn off manual main gas and main gas shut off. Remove the drain plug or open the drain cock located on the
bottom header.

SPAWATER CHEMISTRY
NOTE: Chemical imbalance can cause severe damage to your heater and associated equipment. Maintain your water
pH between 7.4 and 7.8 and total alkalinity between 100 and 150 p.p.m. If the mineral content and dissolved solids in the
water become too high, scale forms inside the heat exchanger tubes, reducing heater efficiency and also damaging the
heater. If the pH drops below 7.2, the heater will be severely damaged.
NOTE: Heat exchanger damage resulting from chemical imbalance is not covered under the warranty.
20
Figure G-1a
SINGLE BOILER - POOL APPLICATION
Figure G-2b
SINGLE BOILER - POOL APPLICATION WITH CHX