Raypak 503-2003 Manual

INSTALLATI N & PERATING
INSTRUCTI NS
CATALOG NO. 3400.53G Effective: 04-16-10 Replaces: 09-12-08 P/N 241288 Rev. 8
WARNING: mproper installation, adjustment, alteration, service or maintenance can
cause property damage, personal injury, exposure to hazardous materials* or loss of
life. Review the information in this manual carefully. *This unit contains materials that
have been identified as carcinogenic, or possibly carcinogenic, to humans.
F R Y UR 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 T D IF Y U SMELL GAS:
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• mmediately call your gas supplier from a neighbor's phone. Follow the gas
supplier's instructions.
• f you cannot reach your gas supplier, call the fire department.
nstallation 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 a safe place for future
reference.
Models 503–2003
Types H & WH
L
W

2
Rev. 8 reflects the following:
Changes to: Table on page 9, Figs 11-12 on page 15, Table I and text changers on page 20, Fig. 18 on page 21, Fig. 21
on page 22, Figs. 22-28 on pages 25-30, Table N on page 28, Modes 1,4, 6 and 8 on pages 30-32, Heater Sequence of
Operation section on page 36, U B iagnostic Board section on page 38, wiring diagrams on pages 39 and 40, U B Fault
History section on page 48.
Additions: Fig. 2 on page 6,Low-lead requirement on page 5, Fig. 8 on page 11, Caution on page 20, Fig. 22 on page 22,
Fig. 35 on page 32, note on page 38, Filter Maintenance and Filter Replacement instructions (including Figs. 48 and 49) on
page 50.

WARNINGS 4
BEF RE INSTALLATI N 5
Product Receipt 5
Model Identification 5
Ratings and Certifications 5
Installations at Elevation 5
Component Locations 6
General Information 6
GENERAL SAFETY 7
Time/Temperature Relationships in
Scalds 7
INSTALLATI N 8
Installation Codes 8
Equipment Base 8
Clearances 8
Combustion and Ventilation Air 9
Conventional Combustion Air Supply 11
Water Piping 12
Hydronic Heating 14
Gas Supply 19
Electrical Power Connections 20
Field Wiring Connection 22
Venting 22
Venting Installation Tips 24
Venting Configurations 24
Outdoor Installation 29
Controls 30
Heater Sequence of Operation 36
WIRING DIAGRAMS 39
START-UP 41
Pre Start-up 41
Start-Up 42
PERATI N 45
Lighting Instructions 45
To Turn Off Gas To Appliance 46
TR UBLESH TING 47
U B Fault History 48
MAINTENANCE 48
Suggested Minimum
Maintenance Schedule 48
Preventative Maintenance Schedule 49
Filter Maintenance 50
Filter Replacement 50
APPENDIX 51
Inside Air Contamination 51
IMP RTANT INSTRUCTI NS F R
THE C MM NWEALTH F
MASSACHUSETTS 52
WARRANTY 53
START-UP CHECKLIST 54
C NTENTS
3

4
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.
CAUTI N: Indicates the presence of hazards or unsafe practices which could cause
minor personal injury or product or property damage if ignored.
N TE: 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: o 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 - CALIF RNIA PR P SITI N
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 de-energize
the equipment before servicing.
CAUTI N: 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.
CAUTI N: Operation of this heater in low
temperature systems requires special piping.
Harmful internal condensation will occur if the inlet
water temperature does not exceed 120°F. Warranty
claims will be denied when condensation occurs.
CAUTI N: 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.
CAUTI N: 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
N TE: Minimum 18 AWG, 105°C, stranded wire
must be used for all low voltage (less than 30 volts)
external connections to the unit. Solid conductors
should not be used because they can cause
excessive tension on contact points. Install conduit
as appropriate. All high voltage wires must be the
same size (105°C, stranded wire) as the ones on the
unit or larger.

5
BEF RE INSTALLATI N
Raypak strongly recommends that this manual be re-
viewed thoroughly before installing your MVB heater.
Please review the General Safety information before
installing the heater. Factory warranty does not apply
to heaters that have been improperly installed or oper-
ated. (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
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 visu-
ally 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 indi-
cated 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 war-
ranty conditions, you must also specify the date of
installation.
Purchased parts are subject to replacement only
under the manufacturer’s warranty. ebits for defec-
tive replacement parts will not be accepted. Parts will
be replaced in kind only per Raypak’s standard war-
ranties.
Model Identification
The model identification number and heater serial
number are found on the heater rating plate located on
the upper rear jacket panel of the heater. The model
number will have the form H7-2003 or similar depend-
ing on the heater size and configuration. The letter(s)
in the first group of characters identifies the application
(H = Hydronic Heating, WH = omestic Hot Water
( HW)). The number which follows identifies the firing
mode (7 = electronic modulation). The second group
of characters identifies the size of the heater (three or
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 Wa-
ter Heaters
• SCAQM Rule 1146.2
• Low-lead content (<.25%) CSA-verified
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. This heater also complies with the latest
edition of the ASHRAE 90.1 Standard.
Installations at Elevation
Rated inputs are suitable for up to 4,500 ft elevation
without de-rating. Consult your local representative or
the factory for installations at altitudes over 4,500 ft
above sea level. No hardware changes are required to
the heaters for installations up to 10,000 ft (adjust-
ments may be required).
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.

General Information
Table A: Basic Data
6
HIGH VOLTAGE
ELECTRICAL CONNECTIONS
Component Locations
Panels omitted for clarity
Fig. 1: Component Locations – Side
Top panel, blower and gas train omitted for clarity
Fig. 4: Component Locations – Top
Fig. 3: Component Locations – Rear
MBTUH
Input
Gas
Conn.
(NPT)
Vent Size
(in.)
Model
No.
Max. Min.
Water
Conn.
(NPT) N P Flue Intake
503 500 125 2 1 1 6 6
753 750 188 2 1 1 6 6
1003 999 250 2-1/2 1-1/4 1 6 6
1253 1250 312 2-1/2 1-1/4 1 8 8
1503 1500 375 2-1/2 1-1/4 1 8 8
1753 1750 438 2-1/2 2 1 8 8
2003 1999 500 2-1/2 2 1 8 8
Panels omitted for clarity
Fig. 2: Component Locations – Front

7
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 rec-
ommended initial setting for the temperature control is
125°F.
This section applies to Hot Water Supply Boilers and
Hot Water Heaters ONLY. For sanitary rinse applica-
tions where outlet temperatures of 180°F to 195°F are
required, a boiler is recommended since the 210°F
limit on water heaters will NOT allow the heater to
maintain these desired sanitary rinse temperatures.
Safety and energy conservation are factors to be con-
sidered 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.
N TE: 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.
Water temperature over 125°F can
cause instant severe burns or death
from scalds.
Children, disabled, and elderly are
at highest risk of beingscalded.
See instruction manual before set-
ting temperature at water heater.
Feel water before bathing or show-
ering.
Temperature limiting valves are
available, see manual.
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.
Water
Temp.
Time to Produce Serious
Burn
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
Table B: Time to Produce Serious Burn

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.
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.).
If the heater needs to be secured to the ground, use
the brackets that were used to bolt the heater to the
shipping pallet.
Clearances
Indoor Installations
When installed according to the listed minimum clear-
ances from combustible construction, these heaters
can still be serviced without removing permanent
structural construction around the heater. However, for
ease of servicing, a clearance of at least 24 in. in front,
at least 24 in. on the rear and 10 in. above the top of
the heater is required. This will allow the heater to be
8
Heater
Side
Minimum Clearance
from Combustible
Surfaces
Minimum
Service
Clearance
Floor* 0” 0”
Rear 12” 24”
Right Side 1” 1”
Left Side 1” 1”
Top 0” 10”
Front Open 24”
Vent 1” 1”
Table C: Clearances – ndoor nstallations
INSTALLATI N
INSTALLATI N
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 evices for
Automatically Fired Boilers, ANSI/ASME CS -1,
(CS -1) when required
• For Canada only: CAN/CSA B149 Natural Gas
and Propane Installation Code and CSA C22.1
C.E.C. Part 1 (C22.1)
The temperature of the water in the heater can be reg-
ulated by using the Raypak Modulating Temperature
Control. To comply with safety regulations, the control
is set at 120°F when shipped from the factory (Mode 3
default setting for Tank Target).
To adjust the water temperature, follow the instruction
for the operation of the control starting on page 30 of
this manual. The control is shown below for identifica-
tion purposes only. (See Fig. 5.)
CAUTI N: Hotter water increases the risk of
scalding! There is a hot water scald potential if the
thermostat is set too high.
Fig. 5: Modulating Temperature Control
* O NOT install on carpeting.
CAUTI N: This heater 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.

9
Fig. 6: Minimum Clearances from Combustible
Surfaces – ndoor and Outdoor nstallations
lation codes and the requirements of the gas supplier.
Three sides must be open in the area under the over-
hang. Roof water drainage must be diverted away
from heaters installed under overhangs.
The combustion air intake terminal MUST be used for
outdoor installations. The elbow is shipped loose to be
installed on the rear of the heater at the job site.
Table D: Clearances – Outdoor nstallations
Venting not shown for clarity. Heater must be vented
per instructions in this manual
serviced in its installed location without movement or
removal of the heater.
Service clearances less than the minimum may
require removal of the heater to service either the heat
exchanger or the burner components. 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.
utdoor Installations
These heaters are design-certified for outdoor installa-
tion. Heaters must not be installed under an overhang
unless clearances are in accordance with local instal-
Combustion and Ventilation Air
Indoor Units
This heater must be supplied with sufficient quantities
of non-contaminated air to support proper combustion
and equipment ventilation. Combustion air can be sup-
plied 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 com-
ply with the requirements of the NFGC (U.S.) and
B149 (Canada), and all local codes.
N TE: Use of this 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.
CAUTI N: Combustion air must not be
contaminated by corrosive chemical fumes which
can damage the heater and void the warranty. (See
the Appendix.)
N TE: It is recommended that the intake vent be
insulated to minimize sweating.
Heater
Side
Min. Clearance
from Combustible
Surfaces
Minimum
Service
Clearance
Rear 12” 24”
Front Open 24”
Right Side 1” 1”
Left Side 1” 1”
Top Unobstructed 10”
Vent
Termination 12” 12”

10
U.S. Installations1Canadian Installations2
AClearance above grade, veranda, porch,
deck, or balcony 1ft (30 cm) 1 ft (30 cm)
BClearance to window or door that may be
opened
4ft (1.2m) below or to side
of opening; 1 foot (30 cm)
above opening
3ft (91 cm)
C Clearance to permanently closed window **
D
Vertical clearance to ventilated soffit located
above the terminal within a horizontal dis-
tance of 2 ft (61cm) from the centerline of the
terminal
5ft (1.5m) *
EClearance to unventilated soffit **
FClearance to outside corner **
GClearance to inside corner 6ft (1.83m) *
HClearance to each side of center line ex-
tended above meter/regulator assembly *
3ft (91 cm) within a height
15ft above the me-
ter/regulator assembly
IClearance to service regulator vent outlet *6ft (1.83m)
J
Clearance to non-mechanical air supply inlet
to building or the combustion air inlet to any
other appliance
4ft (1.2m) below or to side
of opening; 1 ft (30 cm)
above opening
3ft (91 cm)
KClearance to mechanical air supply inlet 3ft (91 cm) above if within
10 ft (3m) horizontally 6ft (1.83m)
LClearance above paved sidewalk or paved
driveway located on public property 7ft (2.13m) 7ft (2.13m) t
MClearance under veranda, porch, deck or
balcony *12 in. (30 cm) TT
1Inaccordance with the current ANSIZ223.1/NFPA54National Fuel Gas Code
2Inaccordance with the current CAN/CGA-B149 Installation Codes
tVent 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, porch, deck, or balcony is fully open on a minimumof two sides beneath the floor and top of terminal and
underside of veranda, porch, deck or balcony is greater than 1 ft(30cm)
*Clearances in accordance with local installation codes and the requirements of the gas supplier
Fig. 7: Minimum Clearances from Vent/Air nlet Terminations – ndoor and Outdoor nstallations
Table E: Vent/Air nlet Termination Clearances

11
Air Filter
An air filter is supplied standard with the heater. This
filter is shipped loose for field installation. Refer to the
Air Filter Kit Installation Instructions (Part No. 241338)
for details.
Direct Vent
If outside air is drawn through the intake pipe directly
to the unit for combustion:
1. Install combustion air direct vent in accordance
with Fig. 27 (horizontal) or Fig. 28 (vertical) of this
manual (pages 27 and 28, respectively).
2. Provide adequate ventilation of the space occu-
pied by the heater(s) by an opening(s) for
ventilation air at the highest practical point com-
municating with the outdoors. The total
cross-sectional area shall be at least 1 in.2of 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 out-
doors or through vertical duct(s). The total
cross-sectional area shall be at least 1 in.2of free
area per 10,000 BTUH (222 mm2per 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 freeze-
up, Raypak highly recommends the installation of
a motorized sealed damper to prevent the circula-
tion of cold air through the heater during the
non-operating hours.
TruSeal™ Combustion Air
In addition to the 3 previous steps, combustion air may
be ducted directly to the heater by using PVC, CPVC
or sealed single-wall galvanized ducting. The duct will
attach directly to the air collar located on the rear of the
heater, using three or four sheet metal screws (not
supplied) equally positioned around the circumference
of the duct. The screen assembly should be removed
before attaching any air duct to the heater. The screws
and duct connection point must be sealed with RTV
(not supplied). TruSeal is generally used when dam-
aging contaminants are present in the mechanical
room.
All ducting should be self-supported.
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 com-
bined 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
space shall be considered in making this determina-
tion. Each opening shall have a minimum free area of
1 in.2per 1,000 BTUH (2,225 mm2per kW) of the total
input rating of all gas utilization equipment in the con-
fined 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 mini-
mum dimension of air openings shall be not less than
3 in. (76 mm) in any direction.
All Air from utdoors
The confined space shall communicate with the out-
doors 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 com-
mencing within 12 in. (305 mm) of the bottom of
the enclosure, shall be provided. The openings
CAUTI N: Use TruSeal combustion air if
damaging airborne contaminants are or may be
present in the heater area. See the Appendix of this
manual regarding air contamination.
Fig. 8: Air Filter Box

shall communicate directly, or by ducts, with the
outdoors or spaces (crawl or attic) that freely com-
municate with the outdoors.
a. Where directly communicating with the out-
doors or where communicating to the
outdoors through vertical ducts, each open-
ing 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.2per 2,000
BTUH (1,100 mm2per kW) of total input rat-
ing 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 out-
doors 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.2per 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.
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
12
WARNING: o not use the “one permanent
opening” method if the equipment room is under
negative pressure conditions.
CAUTI N: All combustion air must be drawn from
the air outside of the building; the mechanical equip-
ment room must communicate directly with the
outdoors.
Canadian Installations
(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.2per 7,000 BTUH (320 mm2per kW) up
to and including 1 million BTUH, plus 1 in.2per
14,000 BTUH (160 mm2per 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 require-
ment 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 sup-
ply opening(s) having a total cross-sectional area
of not less than 1 in.2for each 30,000 BTUH (74
mm2per kW) of total rated input of the burner(s),
and the location of the opening(s) shall not inter-
fere 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 the 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 struc-
tures.
WARNING: Care must be taken to ensure that the
equipment room is not under negative pressure
conditions.

Relief Valve Piping
Temperature & Pressure Gauge
The temperature and pressure gauge is shipped loose
for field installation and must be installed within 12
inches of the boiler outlet (if possible) in an easily
readable location. Installation must comply with ASME
Section IV as well as all applicable national, state and
local codes.
Hydrostatic Test
Unlike many types of heaters, this heater does not re-
quire hydrostatic testing prior to being placed in
operation. The heat exchanger has already been fac-
tory-tested and is rated for 160 psi operating pressure.
However, Raypak does recommend hydrostatic test-
ing 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 glycol-
based anti-freeze. 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.
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
13
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 peration
This heater is equipped with a proprietary condensate
evaporation system which will evaporate any conden-
sate that may begin to accumulate inside the primary
heat exchanger with water temperatures as low as
120°F (49°C).
Heaters operated with an inlet temperature of less
than 120°F (49°C) MUST have a manual bypass (see
Fig. 16) or an approved low-temperature operation
system (Figs. 9 and 10) to prevent problems with con-
densation. This piping is similar to a
primary/secondary boiler installation with a bypass
acting as the secondary boiler piping. Raypak strong-
ly recommends that thermometer(s) be placed into the
heater piping next to the in/out header to facilitate tem-
perature adjustment. Inlet water temperatures below
120°F (49°C) can excessively cool the products of
combustion, resulting in collection of condensate in the
heat exchanger area beyond the capacity of the con-
densate evaporation system.
Failure to reach or exceed 120°F (49°C) within 7 min-
utes may damage or cause failure of the heat
exchanger, combustion chamber, or other parts within
the combustion chamber. It can cause operational
problems, bad combustion, sooting, flue gas leakage
and reduced service life of the appliance and the vent
system. A bypass allows part of the heater discharge
water to be mixed with the cooler water returning to the
heater inlet to increase the heater inlet temperature
above 120°F (49°C). This precautionary measure
should prevent the products of combustion from con-
densing beyond the ability of the condensate
management system employed in this heater in most
installations. Warranty claims will be denied for
damage or failures caused by condensation.
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 initial daily
start-up is acceptable. Where cold water starts will last
WARNING: Pressure relief valve discharge piping
must be piped near the floor and close to a drain to
eliminate the potential of severe burns. o not pipe
to any area where freezing could occur. Refer to
local codes.
CAUTI N: amage due to internal condensation
may occur if the heater inlet water temperature does
not exceed 120°F (49°C) within 7 minutes of start-
up.
CAUTI N: 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.
N TE: Minimum pipe size for in/out connections is
2 in. NPT for 503 and 753 models and 2-1⁄2in NPT for
1003–2003 models. Verify proper flow rates and ∆T
as instructed in this manual.

14
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
120°F (49°C) within the 7-minute time limit.
Cold Water Starts
Cold water starts, where the inlet water temperature
remains below 120°F (49°C) for more than 7 minutes,
must have cold water start protection. Known pro-
tection methods consist of mixing heated outlet water
with the inlet water using a bypass to raise the inlet to
120°F (49°C) or higher. Once the system is heated up
and has return water temperatures of 120°F (49°C) 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 as the system heats up, the out-
let temperature may continue to climb and trip the high
limit, thereby shutting down the heater. Thus an auto-
matic valve system, such as a three-way proportional
valve to control the bypass, should be used.
Cold Water Run
Cold water run differs from cold water start in that the
system water entering the heater remains below
120°F (49°C) 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 of no
more than 10°F (5°C), a permanent manual bypass
can be employed and manually adjusted to achieve an
inlet temperature of 120°F (49°C) or higher as adjust-
ed at the minimum temperature in this narrow
temperature range (i.e. Range 75°F to 85°F, adjust
bypass with temperature at 75°F (24°C)) so that when
temperature is 85°F (29°C), minimum inlet tempera-
ture would be 130°F (54°C). An injector pump
arrangement may also be utilized to keep the heater
loop at or above 120°F (49°C). 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.
Hydronic Heating
Pump Selection
In order to ensure proper performance of your heater
system, you must install a correctly-sized pump. Ray-
pak requires designing for a ∆T within the range of
10°F to 40°F (5°C to 20°C). See Table F for accept-
able flow rates for each model (∆T is the temperature
difference between the inlet and outlet water when the
heater is firing at full rate).
Feedwater Regulator
Raypak recommends that a feedwater regulator be in-
stalled and set at 12 psi minimum pressure at the
highest point of the system. Install a check valve or
back flow device upstream of the regulator, with a
manual shut-off valve as required by local codes.
*
Fig. 9: Cold Water Start
*
Fig. 10: Cold Water Run
*Maximum 4 times the pipe diameter or 12”, whichever is less.
*Maximum 4 times the pipe diameter or 12”, whichever is less.

15
Table F: Heater Rates of Flow and Pressure Drops
20°F T 30°F T 40°F T Min. Flow Max. Flow
Model
No. gpm P(ft) gpm P(ft) gpm P(ft) gpm P(ft) Tgpm P(ft) T
503 44 2.8 29 1.4 N/A N/A 25 1.1 35 100 11.3 9
753 65 6.4 44 3.1 33 1.9 33 1.9 40 100 13.8 13
1003 87 12.0 58 6.0 43 3.7 43 3.7 40 113 18.6 15
1253 109 20.9 73 10.2 54 6.2 54 6.2 40 113 22.2 19
1503 N/A N/A 87 16.0 65 9.5 65 9.5 40 113 25.5 23
1753 N/A N/A 102 22.5 76 13.4 76 13.4 40 113 27.2 27
2003 N/A N/A 116 32.0 87 18.9 87 18.9 40 116 32.0 30
Notes: Basis for minimum flow is ∆T . Basis for maximum flow is gpm.
Piping
All high points should be vented. A heater installed
above radiation level must be provided with a low wa-
ter cut-off device (sales order option F-10). This
heater, when used in connection with a refrigeration
system, must be installed so that the chilled medium is
piped in parallel with the heater with appropriate
valves to pre-vent the chilled medium from entering
the heater.
The piping system of a hot water heater 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 heater
water during the cooling cycle. It is highly recommend-
ed that the piping be insulated.
Air-Separation/Expansion Tank
All heaters should be equipped with a properly sized
expansion tank and air separator fitting as shown in
Fig. 11.
Fig. 11: Air-Separation/Expansion Tank
*
THERMOSTATOR
SYSTEM SENSOR
Fig. 12: Single Heater - Low-Temperature (Heat Pump)
Application with Primary/Secondary Piping
*
THERMOSTAT OR
SYSTEM SENSOR
Fig. 13: Dual Heaters (Reverse/Return)
with Primary/Secondary Piping
*Maximum 4 times the pipe diameter or 12”, whichever is less.
*Maximum 4 times the pipe diameter or 12”, whichever is less.

16
Three-Way Valves
Three-way valves intended to regulate system water
temperatures by reducing flow in the boiler should not
be used. Raypak heaters are high-recovery, low-mass
heaters which are not subject to thermal shock. See
Fig. 16 and instructions on page 17 for adjusting the
manual bypass.
Domestic Hot Water
When designing the water piping system for domestic
hot water applications, water hardness should be con-
sidered. Table G indicates the suggested flow rates for
soft, medium and hard water. Water hardness is ex-
pressed in grains per gallon.
Potable Water and Space Heating
1. All piping materials and components connected to
the water heater for the space heating application
shall be suitable for use with potable water.
2. Toxic chemicals, such as used for boiler treatment,
shall not be introduced into the potable water used
for space heating.
3. If the heater will be used to supply potable water,
it shall not be connected to any heating system or
components previously used with a non-potable
water heating appliance.
4. When the system requires water for space heating
at temperatures higher than 140°F (60°C), a
means such as a mixing valve shall be installed to
temper the water in order to reduce scald hazard
potential.
Pool Heating
When a boiler or water heater is used in a pool heat-
ing application, ensure that all the following installation
requirements are met.
SYSTEM
SUPPLY
SYSTEM
RETURN
Fig. 14: Single Domestic Hot Water Heater and Storage
Tank
CAUTI N: When this heater is used for both
potable water and space heating, observe the
following to ensure proper operation.
Soft (0-4 grains per gallon) Medium (5-15 grains per gallon) Hard* (16-25 grains per gallon)
Model
No. Tgpm PMTS SHL Tgpm PMTS SHL Tgpm PMTS SHL
503 17 50 3.6 2 5.9 17 50 3.6 2 5.9 9 95 10.4 2 18.1
753 26 50 4.0 2 6.3 20 65 6.4 2 10.2 13 100 13.8 2 22.2
1003 30 58 6.0 2-1/2 7.2 20 87 12.0 2-1/2 14.4 15 113 18.7 2-1/2 22.6
1253 30 73 10.4 2-1/2 12.1 20 109 21.0 2-1/2 24.6 19 113 22.3 2-1/2 26.3
1503 30 87 16.0 2-1/2 18.5 23 113 25.7 2-1/2 29.6 23 113 25.7 2-1/2 29.6
1753 30 102 22.7 2-1/2 26.0 27 113 27.4 2-1/2 31.3 27 113 27.4 2-1/2 31.3
2003 30 116 32.0 2-1/2 36.1 30 116 32.0 2-1/2 36.1 30 116 32.0 2-1/2 36.1
∆T = Temperature rise, °F
∆P = Pressure drop through heat exchanger, ft
SHL = System head loss, ft (based on heater and tank placed no more than 5 ft apart and equivalent length of 50 eq. ft. of tubing)
gpm = Gallons per minute, flow rate
MTS = Minimum tubing size
*Must utilize optional cupro-nickel tubes. If over 25 grains per gallon, a water softener/treatment system must be utilized.
Caution: For scale free operation with "Hard Water" (16-25 grains per gallon of total hardness), the operating control must NOT be set
higher than 130 F. For higher than 130 F operation, a water softener/treatment system must be utilized.
Table G: Domestic Water Heater Flow Rate Requirements
N TE: If local codes require a vacuum relief valve,
acquire one locally and install per valve
manufacturer’s instructions.

17
The MVB must be equipped with a field-supplied ex-
ternal pump and bypass arrangement. This
arrangement blends outlet water with the inlet water to
increase the inlet water temperature to a minimum of
120°F (49°C), thereby reducing the likelihood of con-
densation forming on the heat exchanger. The pump
also serves to circulate water through the heater from
the main system piping.
To complete the installation of the pool heater, the pool
thermostat must be installed in the main return water
line, upstream of the heater. This will ensure that the
heater will be energized at the right time.
Adjustment of the manual bypass valve is critical to
proper operation of the heater. The manual bypass
valve should be adjusted to achieve a minimum inlet
water temperature of 120°F (49°C) and a system sup-
ply water temperature below 140°F (60°C). When
starting with a cold pool, make initial adjustments.
Make final adjustments when pool water approaches
desired temperature.
The use of a bypass is required for proper operation in
a pool heating application. Use the following instruc-
tions to set the manual bypass:
CAUTI N: 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 damage the
heater. Follow these instructions to make sure your
heater is properly installed.
1. Turn on pump.
2. Turn on heater and wait until heater goes to full
fire.
3. With the heater operating at 100% firing rate, set
Valve A (the bypass) to 1⁄2open position, and Valve
B to fully open position. See Fig. 16.
4. Adjust Valve A until the inlet water temperature is
120°F (49°C).
5. If this process does not raise the inlet water tem-
perature to 120°F (49°C) and Valve A is fully open,
then slowly throttle Valve B closed to increase the
inlet water temperature to 120°F (49°C).
*
POOL
THERMOSTAT
FROM
FILTER
TOPOOL
CHEMICAL
FEED
Fig. 15: Single Pool Heater Application
N TE: Opening the valve will increase the
temperature and closing the valve will decrease the
temperature.
*Maximum 4 times the pipe diameter or 12”, whichever is less.
Fig. 16: “H” Bypass Setting

18
Pool/Spa Water Chemistry
Chemical imbalance can cause severe damage to the
pool heater and associated e uipment. Maintain the
water chemistry according to the chart below. If the
mineral content and dissolved solids in the water
become too high, scale forms inside the heat exchang-
er tubes, reducing heater efficiency and damaging the
heater. If the pH drops below 7.2, this will cause cor-
rosion of the heat exchanger and severely damage the
heater. Heat exchanger damage resulting from chem-
ical imbalance is not covered by the warranty.
For your health and the protection of your pool equip-
ment, it is essential that your water be chemically
balanced. The following levels must be used as a
guide for balanced water.
Occasional chemical shock dosing of the pool or spa
should not damage the heater providing the water is
balanced.
Automatic chemical dosing devices and salt chlorina-
tors are usually more efficient in heater water, unless
controlled, they can lead to excessive chlorine level
which can damage your heater.
Winterizing Your Heater
Heaters installed outdoors as pool heaters in freezing
climate areas should be shut down for the winter. To
shut the down heater, turn off manual main gas valve
and main gas shut-off. Close isolation valves. rain
the heater using the hose bibs located on the bottom
of the heat exchanger.
N TE: There are 2 separate drains on the MVB
that must BOTH be drained to protect the heat
exchanger. These are both accessible by removing
the lower front door from the heater. rain any
piping of all water that may experience below-
freezing temperatures.
NTE: Chemical imbalance can cause severe
damage to your heater and associated equipment.
CAUTI N: Corrosive water voids all warranties.
Recommended Level(s) Fiberglass Pools Fiberglass Spas Other Pool and Spa
Types
Water Temperature 68-88°F (20-31°C) 89-104°F (31-40°C) 68-104°F (20-40°C)
pH 7.3-7.4 7.3-7.4 7.6-7.8
Total Alkalinity (ppm) 120-150 120-150 80-120
Calcium Hardness (ppm) 200-300 150-200 200-400
Salt (ppm) 6000 Maximum 6000 Maximum 6000 Maximum
Free Chlorine (ppm)* 2-3 2-3 2-3
Total issolved Solids
(ppm) 3000 Maximum 3000 Maximum 3000 Maximum
*Free Chlorine MUST NOT EXCEED 5 ppm!
Table H: Water Chemistry
CAUTI N: Combustion air must not be
contaminated by corrosive chemical fumes which
can damage the heater and void the warranty.
N TE: For automatic temperature adjustment, a
Cold Water Run (CWR) system can be used instead
of a manual bypass. See Fig. 10.

19
Further advice should be obtained from your pool or
spa builder, accredited pool shop, or chemical suppli-
er for the correct levels for your water.
Automatic Chlorinators and
Chemical Feeders
All chemicals must be introduced and completely dilut-
ed into the pool or spa water before being circulated
through the heater. Do not place sanitizing chemicals
in the skimmer. High chemical concentrations will
result when the pump is not running (e.g. overnight).
Chlorinators must feed downstream of the heater and
have an anti-siphoning device to prevent chemical
back-up into the heater when the pump is shut off.
Gas Supply
Gas piping must have a sediment trap ahead of the
heater gas controls, and a manual shut-off valve lo-
cated outside the heater jacket. It is recommended
that a union be installed in the gas supply piping adja-
cent to the heater for servicing. The gas supply
pressure to the heater must not exceed 10.5 in. WC for
natural gas or 13.0 in. WC for propane gas. A pounds-
to-inches regulator must be installed to reduce the gas
supply pressure if it is higher than noted above. This
regulator should be placed a minimum distance of 10
times the pipe diameter upstream of the heater gas
controls. Refer to Table I for maximum pipe lengths.
Gas Supply Connection
DANGER: Make sure the gas on which the heater
will operate is the same type as specified on the
heater’s rating plate.
CAUTI N: The heater must be disconnected from
the gas supply during any pressure testing of the gas
supply system at test pressures in excess of 1/2 psi
(3.45 kPa).
The heater must be isolated from the gas supply pip-
ing system by closing the upstream manual shut-off
valve during any pressure testing of the gas supply
piping system at test pressures equal to or less than
1/2 psi (3.45 kPa). Relieve test pressure in the gas
supply line prior to re-connecting the heater and its
manual shut-off valve to the gas supply line. FA LURE
TO FOLLOW TH S PROCEDURE MAY DAMAGE
THE GAS VALVE. Over-pressurized gas valves are
not covered by warranty. The heater and its gas con-
nections shall be leak-tested before placing the
appliance in operation. Use soapy water for leak test.
O NOT use an open flame.
Gas Supply Pressure
A minimum of 4.0 in. WC and a maximum of 10.5 in.
WC upstream gas pressure is required under load and
no-load conditions for natural gas. A minimum of 4.0
in. WC and a maximum of 13.0 in. WC is required for
propane gas. The gas pressure regulator(s) supplied
on the heater is for low-pressure service. If upstream
pressure exceeds these values, an intermediate gas
pressure regulator, of the lockup type, must be
installed.
When connecting additional gas utilization equipment
to the gas piping system, the existing piping must be
checked to determine if it has adequate capacity for
the combined load.
Fig. 17: Gas Supply Connection
CAUTI N: o not use Teflon tape on gas line pipe
thread. A pipe compound rated for use with natural
and propane gases is recommended. Apply
sparingly only on male pipe ends, leaving the two
end threads bare.
CAUTI N: Support gas supply piping with
hangers, not by the heater or its accessories. Make
sure the gas piping is protected from physical
damage and freezing, where required.
N TE: Failure of a heat exchanger due to lime
scale build-up on the heating surface, low pH or
other chemical imbalance is non-warrantable.
N TE: High chemical concentrates from feeders
and chlorinators that are out of adjustment will cause
rapid corrosion to the heat exchanger. Such damage
is not covered under the warranty.

20
• Safety wiring must be NEC Class 1.
• Heater must be electrically grounded as required
by the NEC.
• In Canada, CSA C22. 1 C.E.C. Part 1.
The MVB 503-1503 heaters are wired for 120 VAC, 12
amps while the MVB 1753 & 2003 heaters are wired
for 120 VAC, 18 amps. Consult the wiring diagram
shipped with the heater. Before starting the heater,
check to ensure proper voltage to the heater and
pump.
Boiler mounted pumps (up to 3⁄4hp) get their power
supply directly from the boiler power supply (connec-
tions in rear wiring box). Install a circuit breaker sized
sufficiently for both the heater and the pump. Pumps
larger than 3⁄4hp must use a separate power supply
and run the power through the optional pump contac-
tor which is located in the rear wiring box. Use
appropriately-sized wire as defined by NEC, CSA
and/or local codes. All primary wiring should be 125%
of minimum rating.
If any of the original wire as supplied with the heater
must be replaced, it must be replaced with 105°C wire
or its equivalent.
All high voltage wiring connections to the MVB heater
are made inside the rear wiring box as shown in Fig.
18. Pump power should be taken from terminals 2
(Com), 3 (GN ) and 6 (Hot) – 3⁄4hp and smaller ONLY.
Power to the MVB heater should be connected to ter-
minals 1, 2, and 3 as noted in Fig. 18. All low voltage
wiring, including sensors, interlocks, enable/disable,
and various options are wired into terminals 1–20 on
the front wiring panel as noted in Fig. 18.
The gas valve pressure regulator on the heater is
nominally preset as noted in Table J.
uring normal operation, carbon dioxide should be 8.5
to 9.0% at full fire for natural gas and between 9.5 and
10.0% for propane gas. Carbon monoxide should be
‹100ppm.
Electrical Power Connections
Installations must follow these codes:
• National Electrical Code and any other national,
state, provincial or local codes or regulations hav-
ing jurisdiction.
Natural Gas – 1,000 BTU/ft3, 0.60 specific gravity at 0.5 in. WC pressure drop
Propane Gas – 2,500 BTU/ft3, 1.53 specific gravity at 0.6 in. WC pressure drop
Table : Maximum Equivalent Pipe Length
Manifold Gas Pressure
(High Fire Values)
Model
No. Natural Gas Propane Gas
503 -0.1 -0.1
753 -0.4 -0.1
1003 -0.8 -0.2
1253 -1.6 -0.2
1503 -2.4 -0.6
1753 -0.4 -0.1
2003 -1.0 -0.5
NOTE: Manifold pressures should be ±0.2 in. WC.
Table J: Manifold Gas Pressure Settings
Model
No.
1 in. NPT 1-1/4 in. NPT 1-1/2 in. NPT 2 in. NPT 2-1/2 in. NPT
N P N P N P N P N P
503 15 35 65 150 130 360
753 5 1565100 75180 250
1103 35 55 35 90 125 300 300
1253 15 25 25 60 85 225 200 300
1503 10 15 15 25 60 150 150 275
1753 45 110 115 230
2003 35 90 85 210
CAUTI N: For proper operation, no more than a
30% drop in gas supply pressure from no-load to full-
load conditions is acceptable. Under no
circumstances should the pressure be outside the
listed operational range.