Page 1
Warranty Registration Card must be filled out by the customer and mailed within thirty (30) days of installation in order to gain warranty coverage.
When receiving Phase III®units, any claims for damage or shortage in shipment must be filed immediately
against the transportation company by the consignee.
WARNING
* I N S
* I N S T T
A L L
A L L A A
T I O N
T I O N
A N D M
A N D M
A I N
A I N
T E N
T E N
A N C E *
A N C E *
M
M
A N U
A N U
A L
A L
- Input from 100,000 to 120,000 Btu/hr -
NOTICE
TECH-HMG-25/30-11/99
Phase III HM Series
G-25 & G-30
Gas Fired Forced Draft
with Optional
Sealed Combustion
Combination Heate
rs
If the information in this manual is not followed exactly, a fire or explosion may
result causing property damage, personal injury or death.
For Your Safety
• Do not store or use gasoline or other flammable vapors and liquids in the vicinity of
this or any other appliance.
• WHAT TO DO IF YOU SMELL GAS
- Do not try to light any appliance
- Do not touch any electrical switch; do not use any phone in your building.
- Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.
- If you cannot reach your gas supplier, call the fire department.
Installation and service must be performed by a qualified installer, service agency or the
gas supplier.
CONFORMS TO
ANSI Z 21-10-3
CERTIFIED TO
90870
CGA CAN 1-4-3 M85
Page 2
i
SAFETY INFORMATION
Product and safety information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
PRE-INSTALLATION
Code compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Verifying venting system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Installation located in confined spaces . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Combustion and ventilation air requirements . . . . . . . . . . . . . . . . . . . . . . 4
Recommended clearances. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Locating combination heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Operating restrictions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
INSTALLATION
Venting the combination heater. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Chimney draft venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Direct venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Venting through cold area. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Direct venting procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Piping the combination heater. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Thermal expansion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Air vent. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Temperature and pressure relief valve . . . . . . . . . . . . . . . . . . . . . . 9
Pressure relief valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Water hammer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
General piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Inner tank (domestic) piping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Outer tank (system) piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Domestic piping diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Primary piping - near appliance piping . . . . . . . . . . . . . . . . . . . . . 12
Space heating piping diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Combination heater wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Wiring diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-17
Gas supply piping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-19
COMBINATION HEATER START-UP
Filling the inner tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Filling the outer tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Burner operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
System piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
TABLE OF CONTENTS
Page 3
ii
Venting system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Operating instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
SETTING THE WATER TEMPERATURE
Setting the combination water heater limits. . . . . . . . . . . . . . . . . . . . . . . . 23
Setting domestic water temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
COMBINATION HEATER MAINTENANCE
Annual maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Flueway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Pressure relief valve and T&P relief valve. . . . . . . . . . . . . . . . . . . 24
Antifreeze . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Air vent. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Periodical maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Combustion chamber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Draining the combination heater. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Drain outer tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Drain inner tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25-26
Space heating system contains sufficient anti-freeze . . . . . . . . . . . 28
SPECIFICATION DATA
Dimensional drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Dimensional data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
PARTS LIST
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
SAMPLE SPECIFICATION
Sample specification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
TABLE OF CONTENTS
Page 4
1
Do not use this appliance if any part
has been under water. Immediately call
a qualified service technician to inspect
the appliance and to replace any part of
the control system which has been
under water.
WHAT TO DO IF YOU SMELL GAS
- Do not try to light any appliance
- Do not touch any electrical switch; do
not use any phone in your building.
- Immediately call your gas supplier
from a neighbor’s phone. Follow the
gas supplier’s instructions.
- If you cannot reach your gas supplier, call the fire department.
Installation and service must be performed by a qualified installer, service
agency or the gas supplier.
Should overheating occur or the gas
supply fails to shut off, turn OFF the
manual gas control valve external to the
appliance.
To prevent damage to inner tank,
installer must:
• Fill inner tank prior to outer tank
during start-up.
• Relieve primary system pressure
below 15 psig prior to draining
inner tank.
CAUTION
WARNING
DANGER
DANGER
PRODUCT & SAFETY INFORMATION
Indicates the presence of a hazardous
situation which, if ignored, will result in
death, serious injury or substantial
property damage.
Indicates a potentially hazardous situation which, if ignored, can result in
death, serious injury or substantial
property damage.
Indicates a potentially hazardous situation which, if ignored, may result in
minor injury or property damage.
Indicates special instructions on installation, operation or maintenance, which
are important to equipment but not
related to personal injury hazards.
NOTICE
CAUTION
WARNING
DANGER
The following terms are used throughout this manual to bring attention to the presence of
potential hazards or to important information concerning the product.
Page 5
2
Bacteria can develop in the domestic
water system if certain minimum water
temperatures are not maintained.
Water temperature over 125ºF can cause
severe burns instantly or death from
scalds.
• Children, disabled and elderly are at
highest risk of being scalded.
-Never leave them unattended in or
near shower, bathtub or sink.
-Never allow small children to use a
hot water faucet or draw their own
bath.
• If any one using hot water in the building
fits this description or codes require specific water temperatures at hot water
faucet, we recommend:
a)ensure the factory installed thermosta-
tic mixing valve is working properly.
b)to set the thermostatic mixing valve
for the lowest temperature which satisfies your hot water need.
This will also provide the lowest operating
cost.
Adjusting the water temperature
Setting the knob to a lower temperature will
not have an immediate effect. The stored hot
water will first have to be used.
Further adjustments may be necessary as you
use your Phase III Combination Heater System.
Protection must be taken against excessive
temperature and pressure!
TO PROTECT AGAINST EXCESSIVE TEMPERATURE AND PRESSURE
• Check if the Temperature and Pressure
(T&P) relief valve is in the location
provided. (Domestic Water)
• Check if the 30 psi relief valve supplied is in the location provided.
(Primary water)
•To avoid injury, install the relief
devices to comply with local code
requirements.
CAUTION
WARNING
DANGER
WARNING
PRODUCT & SAFETY INFORMATION
!
DANGER
HOT
BURN
Page 6
3
A. Combustion air inlet
B. Flueway fitted with stainless steel turbulators
C. Primary water
D. Primary Circuit thermostat (up to 180ºF) sensing bulb
E. Burner
F. Water cooled immersed combustion chamber
G. Primary circuit drain connection
H. Corrugated stainless steel heat exchanger
J. 1 1/2” of rigid (CFC-Free) polyurethane insulation
K. Steel body containing primary water
L Primary Connections
M.Baffles (turbulators)
N. Primary connection
O. Baked enamel steel jacket
T. Domestic water
U. Safety limit thermostat (200ºF) (manual reset) (not shown)
L.W.C.O.: Low water cut-off device (not shown)
Anatomy of your Combination Heater
PRE-INSTALLATION
Fig. 1: Cross section of Combination Heater
Legend
1- CODE COMPLIANCE
Combination Heater installation must conform to the requirements of local codes and
the authority having jurisdiction. In the
absence of these requirements:
Gas fired heaters should be installed in
accordance with National Fuel Gas Code,
ANSI Z223.1.
For installations in Canada - CGA/B149
Installation Code for Gas Burning
Equipment.
All electrical wiring, including grounding
of the heater must be in accordance with
local codes; or in the absence of local codes
with the National Electrical Code,
ANSI/NFPA 70.
The HM G-Series combination heaters are
exempted from ASME Section VIII-1-86-136.
Check with local codes for applicability.
2- VERIFYING VENTING SYSTEM
• Confirm that the venting system is of
sufficient size to handle the flue gases
of all connected equipment.
• Check that it is clear and free of obstructions. Particular attention should be
given to replacement of oil systems.
• Soot may have degraded the chimney
liner and/or accumulated in the chimney
liner requiring a liner replacement or
cleaning.
•Visually inspect the venting system for
proper size and horizontal pitch.
If inspection reveals that the existing
chimney is unsafe or inadequate for the
application, it should be rebuilt to conform to local or national codes, lined or
relined, or provided with a new chimney
or vent sized for the application.
DANGER
L
Hot water
outlet
U
A
B
C
T
D
E
Cold
water
inlet
O
M
K
J
H
N
F
G
Page 7
3- INSTALLATION LOCATED IN CON-
FINED SPACES
Sufficient air must be pro vided for satisf actory combustion, proper venting and ventilation to maintain ambient temperatures at
safe limits under normal operating conditions in accordance with National Fuel Gas
Code latest editions.
For installations located in unconfined spaces
in buildings, infiltration may be adequate for
combustion and ventilation. However, in a
building of tight construction (i.e. weather
stripping, vapor barriers, caulked, etc.), additional air may be provided using the methods
described in Combustion and Ventilation Air
Requirements.
4- COMBUSTION AND VENTILATION AIR
REQUIREMENTS
1.When all air is to be taken from INSIDE
a building with adequate infiltration, the
confined space shall be provided with two
permanent openings to the room. Each
opening, one located within 12” above the
floor the other within 12” of the ceiling,
shall have a free area of one square inch
per 1,000 BTU/H for the total input of all
the equipment located in the space, but
not less than 100 square inches.
2.When all air is taken from OUTDOORS
the confined space shall be provided with
two openings, one 12” above the floor the
other 12” below the ceiling. Each opening
shall be sized for total input of all the
equipment in the space as follows:
a. If opening is directly connected to the
outdoors, or if connected to the outdoors through vertical ducts: 1 square
inch free area per 4,000 BTU/H total
input.
b. If opening is connected to the outdoors
through horizontal ducts: 1 square inch
free area per 2,000 BTU/H total input.
3. Ducts, when used, shall have the same
cross sectional area as the free area of the
openings to which they are connected.
The minimum dimension of a rectangular air duct is 3 inches.
4. Sealed combustion applications:
•A 3” diameter vent can be connected
directly to the blower inlet to draw
outside air directly to the heater.
• See Table 1, pg. 7 for Air Inlet System
Limitation.
• Galvanized steel, stainless steel or
equivalent vent material.
When the combination heater is to be
installed in beauty shops, dry cleaning
establishments or other places with airborne
chlorides, fluorides, hydrocarbons or cleaning fluids, it is essential the combustion air is
taken from outside these areas.
5- RECOMMENDED CLEARANCES
• Clearance to combustibles:
Sides 6”, Top 6”, Venting 8”, Rear 6”,
Front 6” .
HM combination heaters are certified for
combustible floors. This combination heater
should not be installed directly on carpet. It
must be installed directly on the floor or on
metal or wood panel covering the entire
combination heater base. The panel must be
strong enough to carry the weight of the
heater when full of water.
• Clearance for servicing:
- 12” for piping & servicing rear.
- 24” for access to control and components, front.
- 36” for flueways, top.
- 6” on remaining side
NOTICE
NOTICE
4
PRE- INSTALLATION
Page 8
5
PRE- INSTALLATION
6- LOCATING COMBINATION HEATER
• Direct, sidewall venting
Give special attention to location of combination heater vent to avoid possibility of
severe personal injury, death, or substantial
property damage.
- Flue gases will form a white plume in
winter.
- Plume could obstruct favorite window
view.
- Prevailing winds could cause freezing
of condensate and water/ice build-up on
building, plants or roof.
- Excessive winds may cause nuisance
Combination Heater shutdowns when
unit is sidewall vented.
- Locate or guard the vent to prevent
accidential contact by people or pets.
-Vent must terminate at least 4 feet
below, 4 feet horizontally from any
door, window or gravity air inlet to the
building. This vent must not be less
than 7 feet above grade when located
adjacent to public walkways.
- DO NOT terminate vent into window
well, stairwell, alcove, courtyard or
other recessed area.
- DO NOT terminate vent above any door,
window or gravity air inlet. Condensate
can freeze causing ice formations.
-Terminate vent at least 6 feet from adjacent walls.
-Terminate vent at least 1 foot above
grade, including normal snowline.
•
This combination heater is not approved
for outdoors installation. It should be
located indoors in an area with above
freezing temperatures.
• The combination heater should be located
so that any leakage from the tank or water
connections will not cause damage to the
area adjoining the combination heater or
to lower floors in the structure.
- When such a location is una voidable
a suitable drain pan with adequate
drainage, should be placed under the
combination heater. The pan must
not restrict combustion air flow.
7- OPERATING RESTRICTIONS
• Maximum working pressure for inner
(domestic water) tank is 150 psig.
• Maximum working pressure for outer
(primary water) tank is 45 psig.
• Maximum domestic hot water temperature is 180ºF (use only for special hightemperature operational requirements).
• Inner tank has factory installed
Temperature & Pressure Relief Valve
with an AGA rating of 100,000 Btu/hr
for G-25 and 200,000 Btu/hr. for G-30.
• Outer tank has a factory installed 30
psig relief valve rated at 535,000 Btu/hr
• Electrical rating:120 V, 60 Hz, less
than 12 amperes
• Single wall heat exchanger in combination heater complies with National
Standard Plumbing Code, provided that:
- Outer tank water (including additives) is practically non-toxic, having toxicity rating or class of 1, as
listed in Clinical Toxicology of
Commercial Products,
- Outer tank pressure is limited to
maximum 30 psig by approved
relief valve.
• pH & chloride limits for combination
heater are:
- Chloride, less than 80 mg/l.
- pH, 6-8.
NOTICE
WARNING
Page 9
6
1- VENTING THE COMBINATION HEATER
• Determine venting method to use.
Refer to appropriate sections for installation details.
• Use vent materials approved by local
codes for gas-fired appliances. In their
absence refer to:
- National Fuel Gas Code, ANSI
Z223.1.
- In Canada, refer to CAN/CGA B149
Installation Code for Gas Fired
Equipment.
- NFPA 211, Standard for Chimneys,
Fireplaces, Vents and Solid Fuel
Burning Appliances.
1A. Chimney Draft Venting
• Use galvanized steel vent or equivalent
•To prevent downdrafts, chimney should
extend at least 2 feet above highest part
of roof or other structures within 30 feet.
•To vent with another appliance, see
National Fuel Gas Code, ANSI Z223.1,
latest edition.
•For inside chimney (no walls exposed
to outside).
- Inside of chimney must be lined with
vitreous tile or metal liner.
- Maintain two-inch clearance from
combustible material to vent pipe.
- DO NO T use chimney with open f ireplace.
- Inspect chimney and clean if needed.
- Make horizontal runs as short as possible. Long runs can cause condensation.
- When longer runs are used, support
with appropriate hangers.
-To prevent blockage, do not vent into
bottom of chimney.
-Vent pipe must not go beyond inside
wall of chimney.
-Vent passing through floors or ceilings must be firestopped.
• Outside chimney (one or more walls
exposed to outside)
- Can be used for chimney draft venting only when lined with corrosion
resistant metal liner. Provide condensation drain.
- Size liner per ANSI Z223.1.
Increase breeching at the appliance.
- Can be used a raceway for direct
venting.
1B. Direct Venting
When replacing an existing appliance on
common venting system, the vent system
may be too large for remaining appliances. Refer to ANSI Z223.1 for proper
sizing.
Give special attention to location of
Combination Heater vent to avoid possibility of severe personal injury, death, or
substantial property damage.
•Review “Locating Combination Heater”
to determine location of venting.
• Use AL29-4C or equivalent vent
material.
1C. Venting Through Cold Areas
• Extended runs through cold areas could
cause condensation which must be
drained away.
• Provide a means to trap and drain condensation from the vent system. Do not
place drain where freezing could occur.
• Crimped ends of vent pipe must face
toward appliance.
WARNING
CAUTION
INSTALLATION
Page 10
• Use AL29-4C or equivalent vent material
and follow “Direct Venting” Procedure.
1D. Direct Venting Procedur e
1.Determine entire vent length and number of elbows required. Actual venting
system must not exceed limitations in
Table 1 below or as stated in ANSI Z
223.1.
2.Use 3-inch diameter vent pipe pitched
up from Combination Heater. Do not
connect other appliances to this vent.
3.Seal all AL29-4C vent joints with
approved silicone sealant (400ºF Dow 732 RTV or equivalent)
4.MAINTAIN TWO-INCH CLEARANCE from combustible materials to
vent pipe.
5.Long horizontal vent runs should be
supported with appropriate hangers.
Ensure vent pipe is pitched up from the
unit at 1/4” per foot minimum.
6.Direct sidewall vent termination:
• Masonary walls - make a 3 1/2 to 4 -
inch diameter hole.
• Combustible material - requires 7-
inch hole. Make sheet metal plate
with 3-inch hole to cover opening.
• Must be in the same pressure zone
(i.e. same outside wall) as the combustion air inlet.
7
INSTALLATION
Total length for 3" AL29-4C Venting System and 3"
Combustion Air Inlet vs number of elbows
Maximum length - feet 50 45 40 35
Maximum number of elbows
1234
Direct Venting thru Non-Combustible Wall
Direct Venting through
Outside Chimney
Fig. 2
Fig. 3
Table 1
Caulk opening
Anchored fastners
Cement
mortar
seal
Metal Plate
Vent Termination
Flashing
recommended
to direct exhaust
away from wall
12" Min.
Grade level
Sealed chimney
opening
3" Stainless steel vent pipe
vertical run through
entire chimney
Seal all joints
inside and outside
of chimney
Air Intake
Triangle
Tube
Pitch up
1/4"/Ft
Page 11
8
Metal Plate
Direct Venting thru Combustible Wall
INSTALLATION
Draft Venting Through the Roof
Draft Venting through Inside Chimney
Fig. 4
Fig. 5
Fig. 6
2" Min.
clearance
Caulk opening
Anchored fastners
Vent Termination
Flashing
Anchored
fastners
recommended
to direct exhaust
away from wall
12" Min.
Grade level
Flashing with Collar
Per ANSI Z-223.1
Air Intake
Triangle
Tube
Size Vent
Vent Cap
Inside
Chimney
Seal
Tight
Pitch up
1/4"/Ft
Increaser connection
(size per ANSI Z-223.1)
Air Intake
Triangle
Tube
Page 12
9
2- PIPING THE COMBINATION HEATER
A-Thermal Expansion
If a backflow preventer, check valve or
pressure reducing v alve is piped on cold
water inlet, install an expansion tank on
cold water supply line to prevent normal thermal expansion from repeatedly
forcing open T&P relief valve.
T&P relief valve is not intended for
constant duty, such as relief of pressure
due to repeated normal system expansion. Correct this condition by
installing a properly sized expansion
tank in domestic water system. Refer
to expansion tank manufacturer’s
instructions for proper sizing.
B- Air Vent
• Automatic air vent is factory installed on
the heater.
• Unscrew vent cap on air vent one full
turn. Leave cap unscrewed one turn
for normal venting.
C- Temperature and Pressure Relief
Valve
• T&P relief valve is factory installed on
inner tank of the heater.
• T&P relief valve per AGA of 100,000
Btu/hr for G-25.
• T&P relief valve rated per AGA of
200,000 Btu/hr for G-30.
• T&P relief valve dischar ge piping must be:
- made of material serviceable for
temperatures of 250ºF or greater
- directed so that hot water flows
away from all persons.
- directed to a suitable place for
disposal.
- installed so as to allow complete
draining of the T&P relief valv e and
discharge line.
• T&P relief valve dischar ge piping must
not be:
-excessively long. Using more than 2
elbows or 15 feet of piping can
reduce discharge capacity.
- directly connected to a drain.
Terminate discharge piping within
6” from floor. Refer to local codes.
- plugged, reduced or restricted.
- subjected to freezing.
Do not install any valve between T&P r elief
valve and tank connection, or on T&P
relief valve discharge piping. Do not plug
T&P relief valve or discharge piping.
Improper placement and piping of T&P
relief valve can cause severe personal
injury, death or substantial property damage.
D- Pressure Relief Valve
• Pressure relief valve is factory installed
on outer tank of the heater.
• 30 psig pressure relief valve rated per
AGA of 535,000 Btu/hr.
• Provide safe discharge through piping
near floor or close to floor drain. Relief
valv e must be installed so that the spindle
is vertical.
To avoid scalding or water damage,
relief valve discharge must be piped near
floor or close to floor drain. Do not plug,
valve or place any obstruction in discharge piping.
3. WATER HAMMER
Dishwashers, clothes washers and fast-closing positive shut-off valves incorporated in
the system all contribute to creating water
shock. Install a water hammer arrester to prevent damage to pipes and appliances. See
manufacturer’s instructions for application
and installation.
WARNING
WARNING
CAUTION
INSTALLATION
Page 13
10
4. GENERAL PIPING
• All plumbing must meet or exceed all
local, state and national plumbing codes.
• Use pipe dope or tape suitable for potable
water on the domestic piping.
• Use isolation valves to isolate system components.
• Install unions for easy removal of combination heater. Use dielectric unions or
couplings to protect hot and cold water
fittings from corrosion when connecting dissimilar materials such as copper
and galvanized iron pipe.
• If plastic is used for primary water connections, it must not exceed a maximum
oxygen diffusion rate of 0.1 mg/literday for combination heater protection.
• When water supply pressure is higher
than T&P relief valve rating, install a
pressure reducing valve on cold water
supply line to prevent water loss
through T&P relief valve.
5. INNER TANK (DOMESTIC) PIPING
•A thermostatic mixing valve and check
valve are factory installed on the
domestic hot water outlet.
• Install U tube assembly, (factory assembled & provided with the combination
heater), to the mixing valve/check valve
outlet and to the factory assembly tee at
the cold water inlet.
- If there is a need to alter the piping
such as adding a tee upstream of the
mixing valve to deliver 140º water to
the dish washer, (if local codes permit) the installer must re-install this
mixing valve prior to operation of the
combination heater.
The mixing valve must remain mounted
on the domestic hot water outlet at all
times. Removal of automatic mixing
valve from combination heater will
result in severe personal injury or death.
•For recommended domestic water piping arrangement see Fig. 7 page 11.
•For recommended domestic water piping with recirculation see Fig. 8 page 11.
To prevent potential scalding hazard, recirculation must be controlled by an additional
aquastat. Do not use continuous recirculation.
6. OUTER TANK SYSTEM PIPING
• Recommended piping shown page 12
and 13.
• Install expansion tank:
Diaphragm-type expansion tank. Ensure
tank pressure and size will handle system
fill pressure and water volume.
- Fill pressure may be adjusted at
tank for design conditions. Follow
manufacturer’s instructions.
- Locate expansion tank near the unit,
before the inlet of the circulator.
Closed-type expansion tank. Size tank
to system requirements. Refer to manufacturer’s instructions.
Undersized expansion tanks can cause system water to be lost from relief valve and
makeup water added through fill valve
Eventual outer tank failure can result.
• If antifreeze is used in system water,
local codes may require a backflow preventer on cold water supply line.
Use antifreeze specifically intended f or
hydronic heating systems. Inhibited
propylene glycol is recommended.
• System water (including additives) must
be practically non-toxic, having toxicity
rating or class of 1, as listed in Clinical
Toxicology of Commercial products.
CAUTION
DANGER
DANGER
INSTALLATION
Page 14
Fig. 8: G Model with mixing
valve and recirculation
Fig. 7: G Model with mixing
valve without recirculation
1. Mixing valve
2. Flow check valve
3. Shut off valve
4. Backflow preventer or pressure reducing valve
6. Thermal expansion tank
7. Circulator (controlled by aquastat)
8. Domestic drain valve
9. Vacuum breaker (if code permitting)
Note: All shut off valves
shown in this figure must be
shut when siphon draining
the combination heater
Note: All shut off valves
shown in this figure must be
closed when siphon draining
the combination heater
* Re-attach valve handle when draining
inner tank.
* Re-attach valve handle when
draining inner tank.
11
Do not use automotive, ethylene glycol or any
undiluted or petroleum-based antifreeze.
This can cause severe personal injury, death
or substantial property damage.
•Any water conditioning system must be
installed and maintained in accordance
with manufacturer’s specifications.
WARNING
INSTALLATION
To dishwasher if
permitted by codes
U-Tube
assembly
3*
2
1
3
6
6" Heat trap
9
4
3
Cold water
inlet
7
To dishwasher if
permitted by codes
8
3
2
3*
2
1
U-Tube
assembly
3
8
6
6" Heat trap
9
4
3
Cold water
inlet
Page 15
To
system
2
1
From
system
2
3
4
2
Cold
water
fill
12
3
To
system
2
1
From
system
2
42
Cold
water
fill
INSTALLATION
To
system
2
1
From
system
2
3
4
2
Cold
water
fill
Primary Piping -Near Appliance Piping
Piping with diaphragm -
type expansion tank
Piping with closed -
type expansion tank
1. Circulator
2. Manual shut-off valve
3. Expansion tank
4. Auto fill valve
Piping with diaphragm - type expansion tank
(alternate circulator location)
Fig. 9
Fig. 9A
Fig. 9B
Page 16
13
1
12" max.
2
2
3
1
2
3
1
2
3
2
3
2
L
O
A
D
L
O
A
D
INSTALLATION
Fig. 10: Primary piping - Zoning with Circulators
Fig. 11: Primary Piping - Zoning with Zone Valve
1. Ciruclator
2. Manual shut-off valves
3. Flow check valve
4. Zone valve
Note: See page 12 for near appliance piping.
• Install balancing valves to adjust flow to distribute heat to all zones
• Size primary manifold for total flow of all ciculators
• Size each circulator to individual circuit requirements
• Install balancing valves to adjust flow to distribute heat to all zones
44
2
1
2
L
O
A
D
2
2
2
L
O
A
D
2
Page 17
14
INSTALLATION
7- COMBINATION HEATER WIRING
Electrical shock hazard. Can cause
severe personal injury, death or substantial property damage. Disconnect power
before installing and/ or servicing.
Wiring Diagram Requirements
• All wiring must be a minimum of 14
gauge and installed in accordance with:
- U.S.A. - National Electrical Code and
any other national, state or local code
requirements having jurisdiction.
- Canada - C.S.A. C22.1 Canadian
Electrical Code Part 1 and any other
national, provincial and local code
requirements having jurisdiction.
• If original wire, supplied with appliance must be replaced, Type 90ºC or its
equivalent must be used.
• All electrical contacts shown do not hav e
power applied - off shelf condition.
Zone Valves
•Transformer should be sized for maximum load of all zone valves.
Space Heating
•For single zone space heating wiring,
connect 24 V thermostat wiring to combination heater snap-set labeled “Room
Thermostat”.
Outdoor Control Limit
• Provided and installed by others
• Remove factory jumper and use terminal
9 &10
WARNING
Fig. 12: Wiring Diagram
R2A
Auto
Reset
Limit
120 VAC
B
3
R
4
R1A
5
R
120V
24V
B
R
7
LWCO
H
On-Off
Switch
1
B
B
Y
8
Manual
Reset
Limit
Circulator
Blower
Secondary
T-stat
Primary
T-stat
N
G
2
W
Y
3 Port Valve Snap-set
Room T -stat Snap-set
11
BL
9
10
R2B
Factory
Jumper
Equipment
Ground
17
16
19
18
V
R3B
Air Switch
15
Note
Note
1.
All wiring must comply with the National Electrical
All wiring must comply with the National Electrical
1.
Code and additional national, state or local code
Code and additional national, state or local code
requirements. For Canadian installations, all
requirements. For Canadian installations, all
wiring must comply with the Canadian Electrical Code
wiring must comply with the Canadian Electrical Code
All wiring must be N.E.C. Class 1.
2.
2.
All wiring must be N.E.C. Class 1.
Use 90ºC. thermoplatic wire or equivalent, if only
3.
Use 90ºC. thermoplatic wire or equivalent, if only
3.
4.
R2
OR
OR
R3A
the original wire must be replaced.
the original wire must be replaced.
- Denotes Terminal Block
4.
- Denotes Terminal Block
6
Y
TT
P
V
14
13
Ignition Control
(see Fig. 18)
P
Y
R3
V
R1
12
Page 18
15
INSTALLATION
W
•Factory wired
• Domestic priority - will not provide heat
to the sytem
• Maximum domestic performance
Fig. 13: Circulator wiring - domestic priority
Fig. 14: Power supply wiring - high voltage
W
BK
R
Circulator
Harness
W
G
120 V Supply
Field Wire
GN
H
BK G W
Factory Wire
Harness
Page 19
16
INSTALLATION
Fig. 15: Field wiring with zone circulators.
120
H
VAC
N
Honeywell
R845A
Relay
Circulator
Zone 1
T
2
T
Thermostat
zone 1
T
4
1
Thermostat
zone 2
T
3
6
5
Circulator
Zone 2
3
4
1
2
5
Additonal zones may be
added as shown above
6
1
C
To HM
" Room Thermostat"
Snap Set
Page 20
17
H
H
High Voltage
120
V.A.C.
24
V.A.C.
Room
Thermostat
Room
Thermostat
Zone 1
Zone 2
Additional zones
Additional zones may
be added as shown above
To HM
"Room Thermostat"
Snap Set
Transformer
(Power)
Zone
Valve
Zone Valve
C
1
INSTALLATION
4 W ire Zone Valve
3 W ire Zone Valve
Fig. 16: Multiple zone field wiring using zone valves
* Use isolation relay on 3-wire
zone valve with non-isolated
end switch. Transformer and
combination heater control
can burn out if isolation relay
is not used.
Additional zones
Zone 1
Zone 2
H
120
Transformer
(Power)
Room
Thermostat
Room
Thermostat
V.A.C.
24
V.A.C.
Zone
Valve
Additional zones may
be added as shown above
H
High Voltage
Zone Valve
* Isolation relay
To HM
1
"Room Thermostat"
C
Snap Set
Page 21
18
INSTALLATION
1. GAS SUPPLY PIPING
• Check that the gas supply meter has sufficient capacity for the full input of the unit
and any other appliances on the meter.
• Refer to Table 2 & 2A page 20 for recommended gas piping.
• Support gas piping with hangers, not by
the heater or its accessories.
• Purge all air from gas supply piping.
• Before placing the combination heater
into operation check the unit and its gas
connections for leaks.
- Close manual main shut-off valve
during any pressure testing at less
than 13”W.C.
- Disconnect heater and gas valv e from
gas supply piping during any pressure testing greater than 13”W.C.
Do not check for gas leaks with an open
flame - use bubble test. Failure to use
bubble test or check for gas leaks can
cause severe personal injury, death or
substantial property damage.
• Use pipe dope compatible with natural
and/or propane gas. Apply sparingly
only to male threads of pipe joints so
that pipe dope does not block gas flow.
Failure to apply pipe dope as detailed
above can result in severe personal
injury, death or substantial property
damage.
Natural Gas:
1.Refer to Table 2 page 20 for pipe length
and diameter. Based on rated combination heater input (divide input by 1,000
to obtain cubic feet per hour).
2. Inlet pressure at gas valve inlet: maximum 14”W.C, minimum 5”W.C.
3.Install 100% lock-up gas pressure regulator in supply line if inlet pressure
exceeds 14”W.C. Adjust for 13”W.C.
maximum.
WARNING
WARNING
Fig. 17
1" x 1" 3/4" Tee
3" Minimum
Direction of flow
Manual Shut off valve
Pressure gauge port
(1/8" NPT plugged)
Male union 3/4" NPT
Burner gas train
Pipe Cap
Page 22
19
INSTALLATION
Length of Pipe Capacity of Pipe in Cubic Feet of Gas Per Hour
in Feet (based on 0.60 specific. gravity, 0.30" w.c. pressure drop )
SCH 40 1/2" 3/4" 1" 1-1/4" 1-1/2"
10 132 278 520 1050 1600
20 92 190 350 730 1100
30 73 152 285 590 860
40 63 130 245 500 760
50 56 115 215 440 670
75 45 93 175 360 545
100 38 79 150 305 460
150 31 64 120 250 380
Table 2: Gas piping sizing - natural gas
•For additional piping schedules, see
ANSI Z223.1
• Canadian installations must comply
with CAN/CGA B149.1 or B149.2
Installation Code.
Page 23
1- FILLING THE INNER TANK
(Domestic W ater)
Never operate combination heater unless
it is completely filled with water.
Always fill the inner tank before filling
the outer tank to prevent any damage to
the inner tank.
1.Close domestic water drain valve
2. Open domestic water isolation valves
for combination heater.
3. Vent air from inner (domestic water)
tank by opening nearest hot water
faucet. Fill domestic water tank completely by allowing water to run until
there is a constant flow of water.
4.Close hot water faucet
2- FILLING THE OUTER TANK
(Primary W ater)
1. Close drain valve at system water outlet of combination heater.
2. Open combination heater’s system isolation valves.
3.Allow air to escape from outer (system
water) tank by opening cap on automatic air vent, located on top of combination heater.
4.Fill to correct system pressure. Correct
pressure will vary with each application. Normal cold water fill pressure is
12 psig.
For proper combination heater operation, always leave vent cap unscrewed
one full turn.
5.When tank is
full, air will stop
escaping and
vent will close.
If air vent does
not seat properly (i.e., water
leaks out),
remove cap A.
Briefly push in valve B and release it
to clean valve seat. Screw cap A on
completely, then unscrew one turn.
6. If antifreeze is used in primary water,
ensure concentration never exceeds a
50/50 ratio. Primary water (including
additives) must be practically nontoxic, having a toxicity rating or class
of 1, as listed in Clinical Toxicology of
Commercial Products. Inhibited
propylene glycol is recommended.
Follow antifreeze manufacturer’s
instructions.
Do not use automotive or ethylene glycol
antifreeze, or any undiluted antifreeze. This
can cause severe personal injury, death or
substantial property damage if ignored.
3- BURNER OPERATION
1. Check to see if the HM Combination
Heater is filled with water (10-12 psi on
Pressure & Temperature gauge on console).
2.Follow operating instructions on page
for start-up of the Combination Heater.
3. If appliance fails to start, check for the
following conditions:
• Loose connection or blown fuse at
power supply
• Secondary thermostat set below
water temperature
• Thermostat set below room temperature
• Gas not turn on at meter or appliance
WARNING
NOTICE
CAUTION
CAUTION
20
COMBINATION HEATER START UP
A
B
Page 24
21
• Incoming natural gas pressure less
than 4” W.C, or propane less than
11” W.C.
4. Check burner flames for proper flame
pattern:
•Typical -transparent blue
•Overfired - Flames are large
• Underfired - flame are small
• Lack of combustion air - Yellow tipping on flames
4- SYSTEM PIPING
• Check sytem piping for leaks, if found,
repair immediately
5- VENTING SYSTEM
• Check the gas tight seal at all vent
connection.
COMBINATION HEATER START UP
Honeywell VR 8304M
Honeywell S8610
Fig. 18:Intermittent pilot combination Gas Valve & Electronic Ignition Control
(See Fig. 12)
Inlet
Gas
Control
Knob
Outlet
Pilot Outlet
12
13
Page 25
22
COMBINATION HEATER START UP
OPERATING INSTRUCTIONS - Honeywell VR8300A
TO TURN OFF GAS TO APPLIANCE
1. STOP! Read the safety information above.
2. Set the heating system thermostat to the lowest setting.
3. Turn off all electric power supply to the
appliance.
4. Open front jacket panel and ensure the “ON
- OFF” switch is the “OFF” position
5. This appliance is equipped with an elec-
tronic ignition system. Do not attempt to
light the burner by hand.
6. Push in gas control knob slightly and turn
clockwise to “OFF” position.
NOTE: Knob cannot be turn to “OFF”
unless knob is pushed in slightly. Do not
force.
Wait five (5) minutes to clear out any gas.
Then smell for gas, including near the floor.
If you then smell gas, STOP! Follow step
“2” in the safety information above. If you
don’t smell gas, proceed to the next step.
7. Turn the gas control knob counterclockwise
to”ON” position.
8. Reconnect the power supply to the appli-
ance.
9. Reset the unit’s “ON-OFF” switch to ON
and close the front jacket panel.
10. Set the heating system thermostat to the desired
setting.
11. If the appliance will not operate, follow the
instructions “To Turn Off Gas To Appliance”
and call your service technician or gas supplier.
FOR YOUR SAFETY READ BEFORE OPERATING
WARNING
The following instructions must be f ollowed exactly, a fire or explosion may result causing property damage, personal injury or loss
of life.
1. Set the system thermostat to lowest setting.
2. Open front jacket panel and turn “ON-OFF”
switch to OFF
3. To turn unit “OFF” follow step 6 in
“Operating Instructions” above.
4. Close front jacket panel.
1. This appliance is equipped with an electronic ignition system. Do not attempt to light
the burner by hand.
2. BEFORE OPERATING, smell all around the
appliance area for gas. Be sure to smell next
to the floor because some gas is heavier than
air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric 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.
3. Use only your hand to push in or turn the gas
control knob or move the gas control knob.
Never use tools. If the knob will not push in
or turn by hand, don’t try to repair it, call a
qualified service technician. Force or
attempted repair may result in a fire or explo-
Page 26
The water temperature control knobs are
located on the control console. The set
point is indicated by a temperature indicator on the top of the back plate behind the
knob. When shipped from the factory the
knobs are rotated completely counterclockwise to the lowest temperature
setting. The temperature settings can be
increased by rotating the knobs clockwise,
see Fig. 19 and 20 below.
•Turn thermostat knob clockwise
to increase water temperature.
•Turn thermostat knob counter-clockwise to reduce water temperature.
The recommended temperature settings are
180ºF for the primary thermostat and 140ºF for
the secondary thermostat.
Studies have indicated that dangerous bacteria can form in the potable water distribution system if certain minimum water
temperatures are not maintained. F or prevention of this, it is recommended the secondary thermostat be set at 140ºF.
• By storing the water temperature at
140ºF or higher, the quantity of domestic water delivered is higher and the
customer has additional protection
from any bacteria growth.
• The secondary thermostat maintains the
minimum domestic water storage temperature.
1. SETTING THE COMBINATION WATER
HEATER TEMPERATURE LIMITS
a. See Figs. 19 and 20 for recommended
setting.
2. SETTING DOMESTIC WATER TEMPERATURE
HOT WATER REPRESENTS A SERIOUS SAFETY HAZARD DUE TO THE
POTENTIAL OF SCALDING
A thermostatic mixing valve is
REQUIRED in the domestic hot water
outlet that would allow the domestic water
to be supplied at a lower temperature than
the storage temperature.
The factory installed thermostatic mixing
valve can be adjusted to control domestic
supply water at 95ºF to 120ºF.
Refer to the mixing valve’s manufacturer’s
instructions for setting the desired domestic
supply temperature.
For proper operation of the thermostatic
mixing valve, the shut-off valve located
on the U-tube assembly MUST remain
open to avoid a potential scald hazard.
DANGER
DANGER
DANGER
23
SETTING THE WATER TEMPERATURE
Fig. 19 : Secondary Thermostat Setting
Fig. 20 : Primary Thermostat Setting
Temperature Indicator
Temperature UpTemperature Down
e
m
s
t
o
i
c
D
g
e
a
s
h
e
P
n
c
i
a
t
a
p
e
S
Back
Plate
h
I
I
-
I
I
-
I
I
e
s
a
P
h
a
s
h
e
P
I
I
-
I
I
-
P
I
I
h
a
e
s
Knob
Temperature Indicator
Temperature UpTemperature Down
a
c
p
e
S
t
a
i
n
e
g
h
D
e
I
I
o
s
I
a
-
h
P
-
I
I
I
e
Back
Plate
s
a
h
P
-
I
I
I
m
P
h
e
a
s
s
t
e
i
c
I
I
I
-
P
h
a
s
e
Knob
Page 27
24
1- ANNUAL MAINTENANCE
A- Flueway
• Must be examined annually.
• Examine flueway by removing the vent
pipe, jacket and flue collector from the
top of the combination heater.
- If cleaning is necessary, remove the
flue baffles and burner,
- Sweep with a flue brush or any wire
scratch brushes.
- Remove any particulate that may have
fallen into the combustion chamber
before replacing the burner.
• Reinstall the flue baffles and flue
collector.
• Examine the vent system for any
obstruction to the flow of combustion
or ventilation air and for deterioration
or damage which could cause leakage
of flue gases or improper venting.
• Clean, repair or replace as required.
B. Pressure relief valve and T&P relief
valves
Manually operate the pressure & T&P
relief valves at least once a year. This
will release some hot water.
Before manually operating either pr essure
or T&P relief valve check that the discharge is directed to a suitable place for
disposal. The discharge line must be full
size, without restriction and installed to
permit complete drainage of both the
valve and line.
T&P relief valve
• Located on the center rear top of the
heater. (see Fig. 22 page 29).
• Lift the lever handle and permit water to
discharge for several seconds.
•If after closing the valve, the valve fails to
completely reset and water continues to
flow, shut OFF power to the heater and
follow the draining procedure. Partially
drain the inner tank and replace the T&P
relief valve.
• If T&P weeps periodically, it may be
due to thermal expansion (see Thermal
Expansion page 9.)
Pressure relief valve
• Located on the left rear top of the outer
primary tank. (see fig: 22 page 29)
• Shut OFF the power to the heater.
• Lift the lever handle to permit water to
discharge for several seconds.
• After closing the valve, if some water
continues to flow , shut OFF the tw o isolation valves separating the combination heater from heating system.
Partially drain the outer tank and
replace the pressure relief valve.
Water from opened drain valves, unions
and other connections may be extremely
hot. To avoid personal injury, death or
substantial property damage;
-Tighten all drain hose connections
- Direct hot water away from all
persons
C. Antifreeze
• The outer (primary) tank is compatible
with inhibited propylene glycol solution with a maximum a 50/50 mix.
• Primary water (including additives)
must be practically non-toxic, having
toxicity rating or class of 1, as listed in
the Clinical Toxicology of Commercial
Products.
WARNING
WARNING
COMBINATION HEATER MAINTENANCE
Page 28
25
COMBINATION HEATER MAINTENANCE
Do not use automotive or ethylene glycol
antifreeze, or any undiluted antifreeze.
This can cause severe personal injury,
death or substantial property damage;
• Introduction of antifreeze can be done
through the drain valve located on the
rear bottom of the heater.
• Check the pH value of the concentration.
If different than pH 7, the antifreeze
must be replaced immediately.
.
Failing to replace the antifreeze periodically voids the warranty on the combination heater.
• Other undiluted solutions are prohibit-
ed and could cause severe personal
injury or substantial property damage.
D. Air Vent
• Check air operation
- Remove vent cap. Briefly push in
valve and release it to clean valve
seat. Screw vent cap on completely,
then unscrew one turn.
When shutting down a unit for an extended period of time, it is recommended to
follow the maintenance pr ocedures shown
under annual maintenance before r estarting the unit.
2- PERIODICAL MAINTENANCE
• Follow instructions on circulator for
oiling, if it is oil lubricated.
• Check valves, pipes and fittings for
leaks.
• Check functions of field installed controls
(see control manufacturer’s installations).
• Check thermostatic mixing valve per
enclosed manufacturer’s installation
and maintenance instructions.
3- COMBUSTION CHAMBER
• No maintenance is required for combustion chamber. The combustion
chamber is an integral part of the combination heater which can not be
removed or replaced.
4- DRAINING THE COMBINATION HEATER
A. Drain Outer Tank
Always drain outer tank before you drain
inner (potable water) tank to prevent any
damage to inner tank.
1. Disconnect power supply to the HM
Combination Heater
2.Close isolation valv es to heating system
3. Connect a garden hose to drain valve
located bottom/rear of combination
heater. Direct the discharge to a safe
place of disposal and drain the primary
tank.
Water from opened drain valves, unions
and other connections may be extremely
hot. To avoid personal injury, death or
substantial property damage;
-Tighten all drain hose connections
- Direct hot water away from all
persons.
B. Drain Inner Tank (see Figs. 7 & 8
page 11)
1. Close the shut off valve on the cold
water line supply.
2.Connect a hose from the domestic tank
drain valve to a floor drain
WARNING
CAUTION
CAUTION
CAUTION
WARNING
Page 29
26
COMBINATION HEATER MAINTENANCE
3. Re-attach valve handle and close the
water shut off valve on the U-tube
assembly .
4.Open drain valve.
5. Open and separate the hot water line
union or a hot water faucet above the
combination heater. This will initiate
the siphoning procedure.
6.To refill and put the HM Combination
Heater back in operation, follow the
instruction under “Filling the Inner
Tank” page 20 .
7. Open the water shut-off valve on the
U-Tube assembly and remove handle
C. When Space Heating System Contains
Sufficient Anti-Freeze
1.Disconnect power supply to combination heater
2. If system pressure is greater than 15
psig, relieve system pressure before
proceeding.
System pressure must not exceed 15 psig
to prevent damage to inner tank.
3.Follow the procedures for draining the
inner tank. The outer tank does not
require draining.
4.When draining is complete
- close drain valve
- remove hose
CAUTION
Page 30
27
Fig. 21B: Rear view
SPECIFICATIONS DATA
Fig. 21A: Side view
1. Primary circuit, ø 1” NPT
2. Primary circuit drain valve connection, ø 1/2” NPT
3. Domestic temperature/pressure relief valve (150
psi), ø 3/4” NPT
4. Primary circuit & pressure relief valve (30 psi), ø 1”
NPT
5. Domestic cold water inlet, ø 3/4” NPT
6. Domestic Hot water outlet & secondary thermostat
sensor, ø 3/4” NPT
7. Automatic reset safety sensor & LWCO pressure
sensor, ø 3/4” NPT
8. Primary pressure & manual reset safety sensor, ø
1/2” NPT
9. Primary thermostat sensor, & primary temperature
indicator, ø 1/2” NPT
10. Primary circuit & air vent, ø 1” NPT
LEGEND
Fig. 22: Top view of Combination Heater
Front
C
Primary Connection
& Pressure Relief Valve
10
E
3
4
Domestic
cold
5
Domestic
hot
6
G
A
D
F
1
2
H
J
B
T&P Relief Valve
Primary Connection
& Air Vent
4
6
Domestic
Hot Water
7
9
3
10
8
Domestic
Cold Water Supply
with Dip Tube
5
Page 31
28
SPECIFICATIONS DATA
Model 10 min. Peak Flow 1st Hour Continuous Flow
Storage Temp. Storage Temp. Rise in Temp.
140ºF 180ºF 140ºF 180ºF 80ºF
G-25 46 56 153 163 128
G-30 51 61 178 188 153
Chart 4: Performance
Type HM G-25 HM G-30
Input Btu/hr 100,000 120,000
Inner Tank Capacity Gal 20 20
Outer Tank Capacity Gal 22 22
Dimensions Inches
A5959
B2121
C2828
D 54.5 54.5
E1414
F5454
G88
H1616
Vent size ø 3" 3"
Connections:
TP Valve (domestic) ø 3/4" 3/4"
Domestic water ø 3/4" 3/4"
Primary connection ø 1" 1"
Drain ø 1/2" 1/2"
Empty weight lb 363 363
Heat exchanger surface Sq. Ft. 17 17
Chart 3: Dimensional Data
Page 32
29
PARTS LIST
Chart 5
All technical data are subject to change without notice
Item Part No. Description Quantity required
by Model
HM G 25, 30
1 Jacket, Front 1
2 Jacket, Door 1
3 Jacket, Left side 1
4 Jacket, Right side 1
5 Jacket , Back 1
6 Jacket, Top cover 1
7 Control panel console 1
8 HMSWI02 ON/OFF switch 1
9 HMGAU01 Temp./Pres. gauge 1
10 P3THT01 Operating T'Stat. 2
11 P3KWB01 Knob 2
12 P3BZL01 Bezel 2
13 HMC0N01 Manual Reset T'Stat 1
14 Flue Collector - 3" 1
15 Turbulators 4
16 HMTPVO1-35 T & P Relief Valve 150 psi 1
17 HMRLV01 Pressure Relief Valve 30 psi 1
18 P3AVT01 Auto. Air Vent 1
19 P3BSH01 Bushing 1/8"x1/2" 1
20 HMLWC01 Pres. SW. (L.W.C.O.) 1
21 P3DT04 Dip Tube 1
22 HMDRA01 Drain Valve 1
23 HMTH01 Auto reset safety thermostat 1
24 P3VLV01 Mixing valve 1
25 HMCKV01 Check valve - in line 1
26 HNSNP01 Snap sets 2
Page 33
For your own convenience and information, please fill out the following:
CONTRACTOR/INSTALLER:
Name:
Address:
Phone Number:
Date Installed:
30
SAMPLE SPECIFICATION - GAS FIRED
Phase III®HM Series Gas Fired
Combination Heater HM G Model ______or
equal.
1. The Combination Heater(s) shall be
Phase III
®
Model ______ having gas
input of______ BTU/hr and a recovery
rate of ________ GPH at 100º temperature rise.
2. The construction consists of an annular
stainless steel heat exchanger with center
flueway, immersed in a primary fluid for
indirect firing.
The primary fluid - also cooling off the
base of the combustion chamber - prevents a direct contact of the flame and
combustion gases with the corrugated hot
water tank. This unique design insures a
possible 180º F continuous hot water production .
3. The heat exchanger made with high
grade stainless steel shall have a minimum of 17 Square Feet of heat transfer
surface and will be corrugated. The
working pressure rating shall be 150 Psi.
4. The combination heater shall be factory equipped with two adjustable thermostat
at 125-180 ºF, and a safety limit aquastat set at 200ºF with manual reset.
The outer tank containing the primary
fluid shall be protected by a Low Water
Cut-Off device, and a pressure relief
valve set at 30 Psi.
The inner tank shall be protected by a
150 Psi Temperature and Pressure Relief
Valve.
6. The complete unit(s) shall be insulated
with rigid polyurethane foam insulation
and installed in a steel cabinet which has
been finished with a baked enamel paint.
7. The combination heater shall be covered
by a limited Five-year warranty against
leaks and corrosion.
8. The combination heater shall be equipped
with a sealed gas burner with force draft
vent system.
Page 34
Additional quality water heating equipment available
from
Triangle Tube/Phase III
- Exclusive Tank-in-Tank design
-Stainless steel construction
-Available in 8 sizes and 2 models
- Limited LIFETIME residential warranty
- 15 year limited commercial warranty
- Self cleaning/self descaling design
- Construction of high quality corrosion resistant stainless steel (AISI 316)
- Specially designed built-in flow restrictor to assure
maximum heat exchange
- Compact and light weight
-Available in 5 sizes that can accommodate any size
pool or spa
TTP Brazed Plate Heat Exchangers
-For domestic water, snow melting, radiant floor,
refrigeration
- Plates made of stainless steel, with a 99.9 % copper
and brazed, ensuring a high resistance to corrosion
- Self cleaning and self descaling
- Computerized sizing available from Triangle
Tube/Phase III
-Available in capacities from 25,000 BTU/hr to
5,000,000 BTU/hr
Phase III Indirect Fired Water Heaters
Maxi-flo Pool and Spa Heat Exchangers
Freeway Center - 1 Triangle Lane - Blackwood, NJ 08012
Tel: (856) 228 8881 - Fax: (856) 228 3584
http://www.triangletube.com
E-mail: Sales@triangletube.com
Member of
Group
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