Rheem 136-1826 Specification sheet

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.
WARNING
Improper installation, adjustment, alteration, service or maintenance can cause property
damage, personal injury or loss of life. Refer to the user's information manual provided
with this heater. Installation and service must be performed by a qualified installer,
service agency or the gas supplier.
IMPORTANT WARNING
THE HEATER MUST BE INSTALLED IN ACCORDANCE WITH THE INSTRUCTIONS IN THIS MANUAL. WAR-
RANTY WILL NOT APPLY TO UNITS NOT INSTALLED, OPERATED OR MAINTAINED ACCORDING TO THESE
INSTRUCTIONS. THE INSTALLATION MUST CONFORM TO THE AUTHORITIES HAVING JURISDICTION AND/
OR WITH THE LATEST EDITIONS OF THE NATIONAL FUEL GAS CODE ANSI Z223.1, THE NATIONAL
ELECTRIC CODE ANSI/NFPA 70.
Rheem Commercial Water Heater Products
Ruud Commercial Water Heater Products
One Bell Road • Montgomery, AL 36117
[phone]
Part No. 240454
CATALOG NO.: RM-001
Effective : 01-15-02
Replaces: 03-15-01
FOR YOUR SAFETY
Do not store or use gasoline or other flammable vapors or liquids or other combustible
materials in the vicinity of this or any other appliance. To do so may result in an explosion
or fire.
OPERATING AND
INSTALLATION
INSTRUCTIONS
Models 136-1826
MODEL
SERIAL NUMBER
INSTALLATION DATE
START UP DATE

INDEX
3 COPPER SANIMASTER AND TYPHOON HOT WATER HEATERS
4 Specification Data
7 INTRODUCTION
INSTALLATION GUIDELINES
8 Base Requirements
9 Combustible Construction Clearances
10 Combustion Air Supply
Outdoor Venting
12 Indoor Venting
16 Power Venting
Outdoor Heaters
Vent Damper Installation
18 Piping (Gas and Water)
20 Cold Water Supply
21 Hot Water Supply Heater
22 Piping Diagram - 1 Heater 1 Tank Thermostat Supplied
23 Piping Diagram - 1 Heater 2 Tank
24 Piping Diagram - 1 Heater 3 Tank
25 Piping Diagram - 1 Heater 4 Tank
26 Piping Diagram - 2 Heater 1 Tank Uses Special Thermostat & Well
27 Description of Controls in General
Operating Controls
28 Tankstat Temperature Control
29 Electrical
29 Start-Up
30 General Safety Precautions
31 Lighting Instructions
33 Inspection and Maintenance Procedures
Burner Inspection
34 Venting System Inspection
Circulator (Water Pump) Inspection
Service Assistance
35 Trouble Shooting
39 Wiring Diagram
44 Replacement Parts List
2

COPPER SANIMASTER AND TYPHOON
HOT WATER HEATERS
Series GB
for circulating tank systems
136 through 1826 MBTUH
Model Applications
Hot water Supply Heaters are designed to provide hot water service to a variety of applications when used in
conjunction with an appropriately sized storage tank. Models are available for indoor or outdoor installations, and
controls and pump are factory tested and mounted.*
Construction Features
1. All copper high efficiency heat exchanger.
2. Factory mounted pump suited for a wide variety of water conditions.*
3. Flow Switch included on all models.
4. All models feature an energy saving pump control.
5. Glass-lined cast iron headers to handle the most aggressive water conditions.+
6. All units are tested and certified to ANSI Z21.10.3 and carry National Board Stamps HLW.
7. Factory installed pressure relief valve.
8. Temperature pressure gauge and tankstat are included.
9. All inputs over a 400,000 BTU feature intermittent pilot ignition.
10. Models available for Natural or LP Gas.
* Pump shipped separate in carton on Models 136 through 399.
+ Model 136 features Bronze Headers.
3

MBH Natural Gas
Sanimaster Typhoon
(Indoor) (Outdoor)
Input Output Input Output
136.0 112.0 136.0 112.0
181.0 148.0 181.0 148.0
264.0 216.0 264.0 216.0
334.0 274.0 334.0 274.0
399.0 327.0 399.0 327.0
511.5 419.4 511.5 419.4
627.0 514.0 627.0 514.0
726.0 595.0 726.0 595.0
825.0 676.5 825.0 676.5
926.0 759.0
961.7 788.6
1083.0 888.0
1124.7 922.0
1178.0 966.0
1222.5 1002.4
1287.0 1055.0
1336.6 1096.0
1413.0 1158.5
1467.0 1203.0
1570.0 1287.0
1630.0 1336.6
1758.0 1441.5
1825.6 1497.0
ELECTRICALRATINGS
Model
Size With Pump
136-264 3.4 amps @ 120V(1/8 hp pump)
331-399 3.6 amps @ 120V(1/6 hp pump)
512-1826 7.9 amps @ 120V (1/2 hp
pump)
MBTUHPROPANE GAS†
Model
Size Multiplier
136-399 Same as natural gas
512-825 .94
926-1826 .92 Indoor
.955 Outdoor (Input)
.92 Outdoor (Output)
† Multiplier x Nat. MBTUH =
Pro. MBTUH
MODEL
136
181
264
331
399
512
627
726
825
926
962
1083
1125
1178
1223
1287
1337
1413
1467
1570
1630
1758
1826
STYLE
In- Out-
Door Door
• •
• •
• •
• •
• •
• •
• •
• •
• •
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Rated inputs are suitable for up to 2000 feet elevation. For elevations above 2000 feet, reduce input 4% for each
1000 feet above sea level. These heaters are tested and certified to ANSI Standard Z 21.10.3
SPECIFICATION DATA
4

5

Jacket
Height
C
30-1/8
38
38
38
38
33
33
33
33
33-1/2
33-1/2
33-1/2
33-1/2
33-1/2
36-1/2
36-1/2
Gas
Conn.
G
1/2
3/4
3/4
3/4
3/4
1
1
1
1
1
1
1
1
1
1
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
Water
Connection
H
1-1/4
1-1/2
1-1/2
1-1/2
1-1/2
2
2
2
2
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
J
12-1/16
11-1/8
10-3/4
12-1/2
23-5/8
23-5/8
23-5/8
23-5/8
23-5/8
23-5/8
23-5/8
Reference
to
Drawing
1
2
3
4
L
9-1/4
25-3/8
29-1/2
34-1/4
38-1/2
28
32
32
36
36
36
40
Width
A
24-1/8
18-1/4
22-3/8
25-3/4
29-1/4
32-3/4
37-1/2
41-5/8
45-3/4
52-3/8
52-3/8
59-1/4
59-1/4
63-5/8
63-5/8
68-5/8
68-5/8
74-7/8
74-7/8
81-1/8
81-1/8
89-3/8
Height
Overall
B
45
62-5/8
62-7/8
63-3/4
65-3/8
57
57
57
57
76-1/8
78-1/8
78-1/8
80-1/8
80-1/8
83-1/8
85-1/8
Flue
Dia.
K
6
6
7
8
9
10
12
12
14
14
16
16
18
18
18
20
SHIPPING
WEIGHT
LBS (APPROX)
Less Pump
160
182
205
225
244
475
485
635
645
785
705
865
745
925
805
980
875
1080
945
1130
985
1160
1035
W/Pump
210
232
255
275
294
530
540
690
700
840
760
920
800
980
860
1035
930
1130
1000
1190
1040
1220
1090
6
MODEL
SIZE
136
181
264
331
399
512
627
726
825
926
962
1083
1125
1178
1223
1287
1337
1413
1467
1570
1630
1758
1826
Indoor Outdoor
••
••
••
••
••
••
••
••
••
•
•
•
•
•
•
•
•
•
•
•
•
•
•

A. INTRODUCTION
WE RECOMMEND THAT THIS MANUAL BE REVIEWED THOROUGHLY BEFORE INSTALLING THE
WATER HEATER. SHOULD ANY QUESTIONS ARISE, NOT COVERED BY THIS DATA, CONTACT YOUR
LOCAL DISTRIBUTOR OR THE SERVICE DEPARTMENT AT THE FACTORY.
MODEL IDENTIFICATION
The model number of the water heater is found on the rating plate. Each model number identifies the application,
the construction and the function of the water heater , and provides a positive means of identification for application,
installation, operation, service and parts of the unit in a minimum amount of time.
RECEIVING EQUIPMENT
On receiving equipment it is suggested that you
• Review packing slip for the number of packages.
• Inspect for concealed damage immediately.
• Advise carrier, in writing, of shortages or damage.
• Claims are filed by the receiver against the carrier. The carrier, not the shipper, is responsible for any
shortage or damage whether visible or concealed.
B. INSTALLATION GUIDELINES
INSTALLATION REGULATIONS
THE INSTALLATION MUST CONFORM WITH THESE INSTRUCTIONS, REQUIREMENTS OR CODES OF
AUTHORITIES HAVING JURISDICTION, THE LATEST EDITION OF THE NATIONAL FUEL GAS CODE, ANSI
Z223.1 AND THE NATIONAL ELECTRICAL CODE.
ANY ALTERATION OR MODIFICATION TO THE WATER HEATER, ITS COMPONENTS OR ITS INTENDED
APPLICATION MAY VOID THE WARRANTY EXTENDED WITH THE PRODUCT BY THE MANUFACTURER.
WARNING: Improper installation, adjustment, alteration, service or maintenance can damage the
water heater, or create a hazard resulting in asphyxiation, explosion or fire.
WATER FLOW
Low water content heat exchangers require continuous flow for proper operation.
WATER CONDITIONS:
Domestic Hot water heaters are designed for operation with various water conditions. Corrosive water that has
high chlorine content or other chemicals require that the tubes in the heat exchanger be cupro-nickel. Provide us
with an analysis of water where this potential exists.
7

BASE REQUIREMENTS
Indoor water heaters must be installed on a level noncombustible surface, except as noted below. Do not install
on carpeting. Heater sizes 926 to 1758 Typhoon (Outdoor) are supplied with a combustible flooring base as
standard. The following chart lists the part number required for a combustible base, for water heaters supplied
without a combustible base.
COMBUSTIBLE FLOOR BASE
BOILER PART BOILER PART BOILER PART BOILER PART
136 001749 399 058316 825 056202 1337 059236
181 058313 512 056199 962 059233 1467 059237
264 058314 627 056200 1125 059234 1630 059238
331 058315 726 056201 1223 059235 1826 059239
Fig. #8276
Hollow concrete cinder block; align holes and leave ends open.
Alternative method for providing a non-combustible base.
HEATER INSTALLATION
ON CONCRETE BLOCKS OR TILE
HEATER WITH COMBUSTIBLE
FLOOR SHIELD
Fig. #8148.1
8

COMBUSTIBLE CONSTRUCTION CLEARANCES
The water heater should be positioned to provide the minimum clearances from combustible surfaces and to
provide sufficient space for servicing the unit as follows.
MINIMUM CLEARANCES: PROTECTED SURFACES
Clearances to surfaces installed
in rooms which are large (2) in
comparison with size of heater.
Rear 12" 9 6 4 6 4 4 4 4
Left Side 12" 9 6 4 6 4 4 4 4
136 Right Side 6" 5 3 3 6 2 3 3 3
Indoor Top 42" 42 42 42 42 42 42 42 42
Rear 12" 9 6 4 6 4 4 4 4
Left Side 12" 9 6 4 6 4 4 4 4
181-399 Right Side 12" 9 6 4 6 4 4 4 4
Indoor Top 39" 39 39 39 39 39 39 39 39
Outdoor Top(1)
Rear 12 9 6 4 6 4 4 4 4
Left Side 18 12 9 6 6 6 6 6 6
512-825 Right Side 6 5 3 3 6 2 3 3 3
Indoor Top 36 36 36 36 36 36 36 36 36
Outdoor Top (1)
Rear 24 16 12 8 8 8 8 8 8
Left Side 24 16 12 8 8 8 8 8 8
926-1826 Right Side 24 16 12 8 8 8 8 8 8
Indoor Top 24 24 24 24 24 24 24 24 24
Outdoor Top (1)
(1) Unobstructed.
(2) Large rooms are defined as having a volume at least 16 times the total volume of the heater.
(3) Installation clearances for heaters in rooms not large in comparison with the heater size shall be as listed
under combustible surfaces and shall not be reduced by the protection methods.
SERVICING CLEARANCES: 24" in front of heater for removal of burner tray.
18" on side opposite water connection for deliming of Heat Exchanger on
Models 181-1826 only.
Combustible Surfaces
(a) 3 1/2-in. thick masonry wall with-
out ventilated air space
(b) 1/2-in. insulation board over 1-in.
glass fiber or mineral wool batts
(c) 0.024 sheet metal over 1-in. glass fiber or mineral wool batts reinforced with wire on rear face with ventilated air space
(d) 3 1/2-in. thick masonry wall with venti- lated air space (e) 0.024 sheet metal with ventilated air space
(f) 1/2-in. thick insulation board with ventilated air space (g) 0.024 sheet metal with ventilated air space over 0.024 metal with ventilated air space (h) 1-in. glass fiber or mineral wool batts sandwiched between two sheets 0.024 sheet metal with ventilated air space
9

COMBUSTION AND VENTILATION AIR SUPPLY
CAUTION: Combustion air must not be contaminated by corrosive chemical fumes which can damage the heater
and void the warranty.
IMPORTANT: Adequate air must be provided for proper combustion and ventilation of the surrounding area. An
inadequate supply of combustion air will result in incomplete combustion and eventual sooting of the heater.
Insufficient ventilation will cause excessive heat and rapid deterioration of electronic and electrical components.
Equipment rooms should be provided with TWO permanent air supply openings directly connected to outside air.
Each opening must have a minimum FREE area of one square inch per 4000 BTU per hour input of the total input
rating of all equipment in the room. Local codes or authorities having jurisdiction should be consulted for the following
table.
RECOMMENDED MINIMUM AIR OPENINGS
NET NET NET
BOILER FREE BOILER FREE BOILER FREE
SIZE AREA SIZE AREA SIZE AREA
136 34 512 128 1125 282
181 47 627 157 1223 306
264 66 726 182 1337 335
331 84 825 207 1467 367
399 100 962 241 1630 408
All area shown in square inches 1826 457
For other conditions refer to the latest edition of the National Fuel Gas Code ANSI Z 223.1. Net free area, sq. in.
requires data from louver manufacturer based on resistance of screening, if provided.
OUTDOORINSTALLATIONS
MODEL 136
Step 1: Remove the front (4) screws
Step 2: Line up outdoor top vent opening over heater
vent opening.
Step 3: Lower outdoor top onto unit lining up slots in the
outdoor top with screws holes in jacket top.
Step 4: Reinstall (5) screw to secure jacket top and
outdoor top to unit.
Fig. # 8114
10
MODEL 181-399
VENT TERMINAL (Outdoor) Stackless Top Installation
1. Insert tabs into keyhole (4 places).
Pagoda Top
(Shipped
Loose with
Heater)

MODELS 512 - 825
Step 1: Lower outdoor "Stackless" top on to unit.
Position top so it is centered on unit from
side to side and front to rear.
Fig. # 8166.1
Step 2: Tighten the (4) screws (Shown below) until
they come in contact with the unit jacket top,
then evenly tighten all (4) screws to secure to
unit.
JACKET TOP
FASTENING
SCREW
Fig. # 8233
MODELS 926-1758
Heater shipped with outdoor vent terminal factory
installed.
INDOORHEATERS
Indoor Installations
MODEL 136
Step 1: Shut off main electrical per switch to heater.
Step 2: Turn heater manual switch located in upper
control panel to the "OFF" position.
Step 3: Shut off gas supply and water supply to the
heater.
Step 4: Mount drafthood on boiler and attach with the 4
sheet metal screws provided. Drafthood should
be positioned with the vent sensor located on
the front left side as shown.
Step 5: Remove plastic plug from left side of boiler
jacket and install the plastic grommet provided.
Step 6: Route flue sensor wire harness through the
grommet installed in Step 5.
TEMPERATURE
SENSOR
SENSOR
SHIELD
MOUNTING JACKET
SCREWS TOP
HARNESS CONTROL
ASSY. PANEL
HEATER
ON/OFF
SWITCH
LOWER
DOOR
GROMMET
Fig. # 8946
2. Snap tabs into keyholes so as not to pull out.
11

DRAFTHOOD
JACKET TOP PANEL
(part of the heater)
#10 SHEET METAL SCREW (3)
MOUNTING BRACKET (3)
FLUE COLLECTOR
(part of heater)
S
CREW HOLE
L
OCATION
3-1/4"
INNER STACK ADAPTER PANE
L
Fig. #8947
Step 8: Disconnect male/female connector and attach to the 2 wires from drafthood vent sensor harness.
Step 7: Remove door and locate wire from roll out sensor to Hi Limit with the male/female connector.
12
Fig. #8246.5
MODELS 181-399
VENT TERMINAL/INDOOR STACK INSTALLATION
1. Remove the louvered jacket top by removing
four (4) #10 flat head screws.
2. If originally installed, remove "Pagoda" top
from the louvered jacket top.
3. Place the inner stack adapter panel over the
flue collector inside the heater. Make sure
the flanged side of the flue opening is up.
4. Turn the stack (draft hood) up side
down and set it down bottom side up.
5. Turn the jacket top panel (removed in step 1) up
side down and place it through the stack.
6. Attach the three (3) mounting brackets to the
stack using the screws provided and the holes
that are pre-drilled in the stack. Make sure the
brackets are positioned with the flange near the
top side of the stack (see illustration).
Caution must be taken not to over tighten and
strip the screw threads.
7. Turn the assembled stack and jacket top, right side
up. The jacket top will be trapped between the
brackets and the top of the stack. Place the stack
over the inner adapter panel flanged hole and lower
the louvered jacket top panel back into its original
position. Reinstall the four (4) green #10 flat head
screws removed in step 1 above.

MODELS 512 - 825
Locate and assemble as shown below. Secure with
screws supplied in envelope in carton
Fig. #8167.0
13
MODELS 181-399
Step 1. Shut off main electrical power switch to heater.
Step 2. Turn heater manual switch located in upper control panel to the "OFF" position.
Step 3. Shut off gas supply and water supply to the heater.
Step 4. Mount drafthood on top of boiler as shown on page 8. Drafthood should be positioned with the vent
sensor located on the front right side as shown.
Step 5. Remove plastic plug from left side of boiler jacket and install plastic grommet provided.
Step 6. Route flue sensor wire harness through the grommet installed in Step 5.
Step 7. Remove door and locate wire from roll out sensor to hi limit with the male/female connector.
Step 8. Disconnect male/female connector and attach to the 2 wires from draft hood vent sensor harness.
HEATER BEFORE
DRAFTHOOD
INSTALLATION
Fig# 9349
HEATER AFTER
DRAFTHOOD
INSTALLATION
Fig# 9350

MODELS 962 - 1826
Locate and assemble as shown below. Secure with screws supplied in envelope in carton.
Fig. #8265.0
WARNING:
Indoor heaters require a drafthood that must be connected to a vent pipe and properly vented to the outside.
Failure to follow this procedure can cause fire or fatal carbon monoxide poisoning.
Vent piping the same size or larger than the draft hood outlet is recommended, however, when the total vent height
is at least ten (10) feet (draft hood relief opening to vent terminal), the vent pipe size may be reduced as specified
in Chapter 10 of the National Fuel Gas Code, ANSI Z223.1. As much as possible avoid long horizontal runs of vent
pipe and too many elbows. If installation requires horizontal non-vertical runs, the vent pipe must have a minimum
of 1/4 inch per foot rise and should be supported at not less than five foot intervals. Plumbers tape, criss-crossed,
will serve to space both horizontal and vertical piping. Gas vents supported only by the flashing and extending above
the roof more than five feet should be securely guyed or braced to withstand snow and wind load. We recommend
use of insulated vent pipe must terminate with a vent cap which complies with the local codes or, in the absence of
such codes, to the latest edition of the National Fuel Gas Code, ANSI Z223.1.
The discharge opening must be a minimum of three feet
vertically from the roof surface and at least two feet higher than any
part of the building within ten feet. Vent stack shall be at least five
feet in vertical height above the drafthood outlet. The vent cap
location shall have a minimum clearance of 4 feet horizontally from,
and in no case above or below, unless a 4-foot horizontal distance
is maintained, from electric meters, gas meters regulators and relief
equipment.
The weight of the vent stack or chimney must not rest on the
heater draft hood. Support must be provided in compliance with
applicable codes. The heater top and draft hood must be readily
removable for maintenance and inspection. Vent pipe should be
adequately supported to maintain proper clearances from combus-
tible construction.
Type "B" double wall or equivalent vent pipe is recommended.
However single wall metal vent pipe may be used as specified in the
latest edition of the National Flue Gas Code ANSI Z223.1.
5' MIN
2' MIN
10' OR LESS
2' MIN
VENT CAP
VENT PIPE
DRAFT HOOD
HEATER
Fig # 8119
14

At the time of removal of an existing heater, the following
steps shall be followed with each appliance remaining
connected to the common venting system placed in
operation, while the other appliances remaining con-
nected to the common venting system are not in opera-
tion.
(a) Seal any unused openings in the common venting
system.
(b) Visually inspect the venting system for proper size
and horizontal pitch and determine there is no
blockage or restriction, leakage, corrosion and other
deficiencies which could cause an unsafe condi-
tion.
(c) Insofar as is practical, close all building doors and
windows and all doors between the space in which
the appliances remaining connected to the com-
mon venting system are located and other spaces
of the building. Turn on clothes dryers and any
appliance not connected to the common venting
system. Turn on any exhaust fans, such as range
hoods and bathroom exhausts, so they will operate
at maximum speed. Do not operate a summer
exhaust fan. Close fireplace dampers.
(d) Place in operation the appliance being inspected.
Follow the lighting instructions. Adjust thermostat
so appliance will operate continuously.
(e) Test for spillage at the draft hood relief opening
after 5 minutes of main burner operation. Use the
flame of a match or candle, or smoke from a
cigarette, cigar or pipe.
(f) After it has been determined that each appliance
remaining connected to the common venting sys-
tem properly vents when tested as outlined above,
return doors, windows, exhaust fans, fireplace
dampers and any other gas burning appliance to
their previous conditions of use.
(g) Any improper operation of the common venting
system should be corrected so the installation
conforms with the latest edition of the National
Fuel Gas Code, ANSI Z223.1. When resizing
any portion of the common venting system,
the common venting system should be resized
to approach the minimum size as determined
using the appropriate tables in Part 11 of
the National Fuel Gas Code, ANSI Z223.1.
Manifolds that connect more than one heater to a
common chimney must be sized to handle the combined
load.
Consult available guides for proper sizing of the manifold
and the chimney. At no time should the area be less than
the area of the largest outlet.
Fig. #7043.1
15

POWER VENTING
Heaters may be connected to systems requiring mechanical draft exhaust fans. The installation must be
engineered by competent personnel in accordance with the latest edition of ANSI Z 223.1, local codes and with the
supplier of the fan.
Particular attention must be given to the type of vent pipe used, its size and location. Suitable interlocks must
be provided to prevent heater operation until the fan is operating as designed.
OUTDOOR WATER HEATERS
The point from where the flue products exit the heater must be a minimum of four (4) feet below, four (4) feet
horizontally from or one (1) foot above any door, window or gravity inlet to a building. The top surface of the heater
shall be at least three (3) feet above any forced air inlet, or intake ducts located within ten (10) feet horizontally.
HIGH WIND CONDITIONS (Outdoor Units Only)
In areas where high winds are frequent, it may be necessary to locate the heater a minimum of 3' from high vertical
walls, or install a wind break so the heater is not in direct wind current.
Fig. #8245.1
Fig. # 8182.0
VENT DAMPER INSTALLATION
(MODELS 136 THROUGH 264) WHERE REQUIRED
LOCATION
The vent damper must be located in the vent so that
it serves only the appliance for which it is intended.
If improperly installed, a hazardous condition, such
as an explosion or carbon monoxide poisoning, could
result. Make certain that it is mounted in an accessible
location at least 6 in. (152.4 mm) from any combustible
material or the heat exchanger and that the position
indicator is in a visible location.
The vent damper must be installed after the appliance
draft hood, as close to the draft hood as practicable, and
without modification of the draft hood.
16

VENT DAMPER
NORMAL OPERATION SUMMARY
For safe, efficient operation, the vent damper and all
flue product carrying areas of the appliance must be
checked annually, with particular attention given to dete-
rioration from corrosion or other sources. Check vent
damper operation as follows:
1. When the furnace or heater is off, check that the vent
damper position indicator points to the closed posi-
tion, Fig. 4.
2. Turn the thermostat or controller up to call for heat
and check that the vent damper indicator points to
the open position, Fig. 4.
3. Turn the thermostat or controller down again and
check that the vent damper position indicator re-
turns to the closed position. DAMPER OPEN DAMPER CLOSED
FIG.4-VENT DAMPER POSITION INDICATOR
SHOWING OPEN & CLOSED POSITIONS.
MOUNTING
On vertical vents, the vent damper may be mounted with the actuator in any position. On horizontal vents, do
not mount the actuator either directly above or directly below the vent pipe; mount the vent damper actuator to the
side of the vent.
The vent damper is set up for a continuous pilot system. If the vent damper is installed on an intermittent Pilot
or Direct Spark Ignition equipped system, the energy savings of the vent damper can be improved by plugging the
hole in the vent damper blade using the knockout plug, Part No 105612R, provided in the parts envelope.
DO NOT plug the hole if installing the vent damper on a continuous pilot system as this will create a hazardous
condition.
THE VENT DAMPER MUST BE INSPECTED AT LEAST
ONCE A YEAR BY A TRAINED, EXPERIENCED SER-
VICE TECHNICIAN.. THE NAME OF THE PERSON
WHO ORIGINALLY INSTALLED YOUR VENT DAMPER
IS SHOWN ON THE INSTALLATION LABEL. DAMPER
MUST BE IN OPEN POSITION WHEN HEATER MAIN
BURNERS ARE OPERATING.
INSTALLING THE VENT DAMPER IN HORIZONTAL &
VERTICAL VENTS.
D80B GENERAL WIRING DIAGRAM
INSTALL THE VENT DAMPER TO SERVICE ONLY THE SINGLE APPLIANCE FOR WHICH IT IS INTENDED. IF
IMPROPERLY INSTALLED, A HAZARDOUS CONDITION, SUCH AS AN EXPLOSION OR CARBON MONOXIDE
POISONING, COULD RESULT.
17
Damper position
indicator

PIPING: General. Consult particular heater section for specific information.
a. GAS
Gas piping must be installed in accordance with the latest edition of the National Fuel Gas Code ANSI
Z 223.1 and other local or regulatory agency codes that have jurisdiction.
1. Check heater rating plate for
• Correct Fuel Gas
• Rated input to meet local conditions such as altitude, gas specification, etc.
2. Piping from meter must be of sufficient size to provide the required amount of gas at flowing
pressures as follows:
Gas Natural Propane
BTU/CF 1000 2500
SP. GR 0.60 1.53
Minimum Flowing Pressure 7" W.C. 12" W.C.
Maximum Shut-off Pressure 14" W.C. 14" W.C.
PIPE SIZES
Fuel Nat. Propane
Length(feet) 0-100 100-200 200-300 0-100 100-200 200-300
Model
136 3/4 1 1-1/4 3/4 1 1
181 1 1-1/4 1-1/4 1 1 1-1/4
264 1-1/4 1-1/4 1-1/2 1 1-1/4 1-1/4
331 1-1/4 1-1/2 1-1/2 1-1/4 1-1/4 1/1/2
399 1-1/4 1-1/2 1-1/2 1-1/4 1-1/4 1-1/2
512 1-1/2 2 2 1-1/4 1-1/2 1-1/2
627 1-1/2 2 2 1-1/2 1-1/2 2
726 2 2 2 1-1/2 2 2
825 2 2 2-1/2 2 2 2
926 2 2-1/2 2-1/2 2 2 2
962 2 2-1//2 2-1/2 2 2 2
1083 2 2-1/2 2-1/2 2 2 2
1125 2 2-1/2 2-1/2 2 2 2
1178 2-1/2 2-1/2 3 2 2 2-1/2
1223 2-1/2 2-1/2 3 2 2 2-1/2
1287 2-1/2 3 3 2 2-1/2 2-1/2
1337 2-1/2 3 3 2 2-1/2 2-1/2
1413 2-1/2 3 3 2 2-1/2 2-1/2
1467 2-1/2 3 3 2 2-1/2 2-1/2
1570 2-1/2 3 3 2 2-1/2 3
1630 2-1/2 3 3 2 2-1/2 3
1758 2-1/2 3 3 2 2-1/2 3
1826 2-1/2 3 3 2 2-1/2 3
Chart is based on: 0.5" W.C. Pressure Drop Natural Gas
0.6" W.C. Pressure Drop Propane Gas
Fitting provided in gas line have equivalent length of pipe, in feet, as follows:
Size 3/4 1 1-1/4 1-1/2 2 2-1/2 3 4
Elbow 2.5 3 4 4.5 5.5 6.5 8 12
Tee 5 6 8 9 12 14 17 22
3. All gas piping must be tested after installation with air or an inert gas and all connections should be
checked using a soapy solution.
18

CAUTION: The heater and its manual shut off valve must be disconnected from the gas supply during any pressure
testing of that system at test pressures in excess of 1/2 psig (3.45 KPA). Dissipate test pressure in the gas supply
line before reconnecting the heater and its manual shut off valve to gas supply line. FAILURE TO FOLLOW THIS
PROCEDURE MAY DAMAGE THE GAS VALVE. OVER PRESSURED GAS VALVES ARE NOT COVERED BY
WARRANTY. The heater and its gas connections shall be leak tested before placing the appliance in operation.
Use soapy water for leak test. Do NOT use open flame.
Test piping as follows:
Pressure 1/2 PSIG (14" W.C.) or less - isolate heater by closing the manual shut-off valve prior to applying
pressure.
Pressure in excess of 1/2 PSIG (14" W.C.) - The heater must be disconnected from the gas system.
Water heaters having gas train components that have diaphragms in their construction are supplied with a bleed
line connection that must be connected to the outside atmosphere as required by the National Fuel Gas Code. Under
NO circumstances shall bleed lines terminate in the gas utilization equipment flue or exhaust system.
Burner Manifold Pressures. The gas pressure regulator supplied with the heater is factory set to provide a manifold
pressure, as measured with a manometer, of 3.7 in. W.C. for Natural Gas and 10.5 in. W.C. for Propane. If adjustment
is required to obtain these pressures remove cap and turn screw clockwise to increase pressure, counter- clockwise
to decrease pressure.
Fig.#8185.1
19

It is recommended that a gate valve be installed in the cold water supply line adjacent to the heater. If Local Codes
require a check valve - provisions must be made for thermal expansion.
A minimum pressure of 30 PSIG must be maintained in the system to prevent damage to the heater due to lack
of water circulation caused by vapor formation at suction side of the system pumps.
NOTE: Should the cold water supply be interrupted, for any reason, the gas supply must be manually shut off to
prevent heater damage. When the service is restored the lines must be vented to eliminate accumulated air.
b. WATER
Water piping should be installed according to the local code requirements, ASHRAE, ASPE and BOCA
or other regulatory agencies.
COLD WATER SUPPLY
The cold water supply piping, to the heater must be adequate to handle the design load requirements of the hot
water system. The following table illustrates the flow and minimum pipe sizes.
Model
Size
136
181
264
331
399
512
627
726
Flow
GPM
85
90
90
90
90
90
90
90
Model
Size
825
926
962
1083
1125
1178
1287
1337
Min
Pipe
NPT
1-1/4
1-1/2
1-1/2
1-1/2
1-1/2
2
2
2
Flow
GPM
22
30
42
53
63
82
85
85
Min
Pipe
NPT
2
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
Model
Size
1413
1467
1570
1630
1758
1826
Flow
GPM
90
90
90
90
90
90
Min
Pipe
NPT
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
20