Teledyne EHE User manual

FOR YOUR SAFETY - This product must be installed and serviced by authorized person-
nel, qualified in pool/spa heater installation. Improper installation and/or operation can
create carbon monoxide gas and flue gases which can cause serious injury, property
damage, or death. Improper installation and/or operation will void the warranty.
H0205000A
Installation and Operating Data
WARNING
If these instructions are not followed exactly, a fire or explosion may result,
causing property damage, personal injury, or death.
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.
Installation and
Operation Manual
Hi-E2™
Model EHE
Gas-Fired Pool
and Spa Heater

SECTION 1
General Information
1A Introduction ........................................................... 1
1B Description ............................................................ 1
1C Warranty................................................................ 1
SECTION 2
Installation Instructions
2A General Requirements .......................................... 1
2B Heater Assembly and Preparation ........................ 2
2C Heater Location ..................................................... 2
2D Installation Clearances.......................................... 2
2E Outdoor Installation............................................... 2
2F Outdoor Shelter Installation (Canada) .................. 3
2G Indoor Installation.................................................. 3
2G-1 Preparation of Heater For
Indoor Installation.................................................. 3
2G-2 Combustion Air Requirements for
One-Pipe Installation............................................. 4
2G-3 Two-Pipe Installation (Direct Vent) ....................... 4
2G-3a Connection of Combustion Air Pipe...................... 4
2G-3b Piping Materials..................................................... 4
2G-3c Size and Length of Combustion
Air and Vent Piping ............................................... 5
2G-3d Combustion Air and Vent Pipe Installation ........... 5
2G-3e Room Ventilation................................................... 7
2H Condensate Disposal ............................................ 7
2I Gas Supply and Piping ......................................... 8
2J Electric Wiring ..................................................... 10
2J-1 Electrical Power................................................... 10
2J-2 Bonding ............................................................... 10
2J-3 Auxiliary Time Clock Wiring................................ 10
2J-4 Remote Operation ............................................... 10
2K Water Piping........................................................ 11
2K-1 Reversal of Heater Water Connections .............. 11
2K-2 Pool/Spa Piping Systems.................................... 11
2K-3 Connections at Heater......................................... 11
2K-4 Pressure Relief Valve .......................................... 12
2K-5 Automatic Chlorinators (Chemical Feeders)....... 12
2L Start-Up and Adjustment..................................... 13
2L-1 Normal Operation................................................ 13
2L-2 Start-Up ............................................................... 14
2L-3 Condensate ......................................................... 14
2L-4 Gas Pressure....................................................... 14
2L-5 Adjustment of Water Pressure Switch ............... 14
2L-6 Water Temperature Rise..................................... 15
SECTION 3
Operating Instructions
3A Start-Up Procedure ............................................. 16
3B Temperature Controls ......................................... 16
3C Lighting and Shutdown ....................................... 17
3C-1 Lighting the Heater .............................................. 17
3C-2 Shutdown............................................................. 17
3D Water Chemistry ................................................. 17
3D-1 Pools.................................................................... 17
3D-2 Spas .................................................................... 17
3D-2a Spa Water Chemistry.......................................... 17
3D-2b Water Changing .................................................. 17
3D-2c Corrosion............................................................. 18
3D-2d Testing................................................................. 18
3E Spa/Hot Tub Safety Rules................................... 18
3F Swimming Pool Energy Saving Tips................... 18
3G Seasonal Care..................................................... 19
3G-1 Spring and Fall Operation................................... 19
3G-2 Winterizing .......................................................... 19
3H Periodic Inspection .............................................. 19
3H-1 Owner Inspection ................................................ 19
3H-2 Professional Inspection ....................................... 20
SECTION 4
Maintenance and Service
4A General ................................................................ 20
4B Induced-Draft Combustion System..................... 21
4C Heater Components and Their Operation........... 21
4D Combustion Air Filter .......................................... 22
4E Electrical Trouble Shooting ................................. 22
4E-1 115V Electrical Power Supply ............................. 22
4E-2 Control Circuit Trouble Shooting......................... 23
4E-2a Transformer......................................................... 23
4E-2b Fuse..................................................................... 23
4E-2c Fireman Switch and External Interlocks ............. 24
4E-2d Limit Switches ..................................................... 24
4E-2e Water Pressure Flow Switch............................... 24
4E-2f Temperature Control ........................................... 24
4E-2g Venturi Pressure Switch ...................................... 24
4E-2h Ignition Control .................................................... 24
4E-2i Burner Limit Switch ............................................. 25
4E-2j Vent Limit Switch ................................................ 25
4E-2k Combustion Blower ............................................. 25
4E-2l Igniter................................................................... 25
4F Venturi Combustion Flow System....................... 25
4F-1 Pressure Measurement Ports.............................. 25
4F-2 Venturi System Checkout.................................... 26
4F-2a Unfired Venturi Differential Pressure .................. 26
4F-2b Gas Pressure Offset............................................ 26
4F-2c Gas Orifice Differential........................................ 26
4F-3 Air Flow Investigation .......................................... 27
4F-3a Combustion Air Flow........................................... 27
4F-3b Flow in Heater and Vent...................................... 28
4F-4 Fuel Gas Type and Gas Orifice Size .................. 28
4F-5 High Elevation Operation .................................... 28
4G Combustion Condensate..................................... 28
4H Major Component Service................................... 29
SECTION 5
Capacities and Dimensions
5A General Information ............................................ 29
SECTION 6
Replacement Parts
6A. General Information ............................................ 30
TABLE OF CONTENTS

Hi-E2 Page 1
SECTION 1.
General Information
1A. Introduction
This manual contains information for the proper
installation and operation of the Hi-E2Model EHE
pool/spa heater. Certain sections are specific to United
States or Canadian installations, and are labeled United
States or Canada. Procedures in this manual must be
followed exactly. To obtain a copy of this manual
contact Teledyne Laars. For address information see
back cover.
1B. Description
The Hi-E2is a very efficient gas-fired pool and
spa heater. Its combustion system includes a heat
exchanger which extracts 95% of the energy in the gas
fuel. It has no standing pilot burner. It exceeds the
requirementsofenergyconservationregulationssuch
as those in California, Hawaii, New York, Oregon and
other states which require that a pool heater have
intermittentignition.
The heater is designed to operate in conventional
swimming pool and spa equipment arrangements. It
requires 115V 60 Hz electrical power. It has the
versatile Teledyne Laars FlexTemp dual-thermostat
control system for pool/spa combinations.
The Hi-E2is certified by International Approval
Services, Inc. to comply with latest editions of
applicable standards. In the United States, the
applicable standard is ANSI Standard Z21.56 for
gas-fired pool heaters. In Canada, it is Standard CAN
1-4.7-M85.
The heater has been designed specifically to heat
fresh water swimming pools and spas, and with proper
installation and care, it will provide years of reliable
service. Do not use it to maintain pool or spa water
temperature below 70°F. Do not use it as a heating
boiler or general service water heater or to heat salt
water. For special applications, consult your Teledyne
Laars dealer.
1C. Warranty
The Hi-E2is sold with a limited factory warranty.
A copy of the warranty is included in a plastic bag
inside the heater and on the back cover of this manual.
The home owner should fill out the warranty
registration card included in the plastic bag and return
it to Teledyne Laars. The warranty does not cover
damage caused by improper installation, operation, or
field modification; or damage to the heat exchanger
caused by corrosive water. See Section 3F for
guidelineson pool water chemistry.
WARNING
Improper installation or servicing can cause
property damage, injury or death due to fire,
asphyxiation or carbon monoxide poisoning.
SECTION 2.
InstallationInstructions
2A. General Requirements
All gas-fired products require correct installation
to assure safe and satisfactory operation. The
requirementsforpoolheaters include the following:
1. Appropriate site location and clearances.
2. Sufficient supply of clean air for combustion and
ventilation.
3. Proper venting of products of combustion.
4. Properly sized gas pipe.
5. Properly sized gas meter.
6. Adequate water flow.
7. Provision for disposal of combustion condensate
water.
In the United States, installation must be in
accordance with local codes and the most recent edition
of the National Fuel Gas Code, ANSI Z223.1. The
Code can be obtained from:
National Fire Protection Association
1 Batterymarch Park
Quincy, MA 02269
In Canada, install the heater in accordance with
local codes and the most recent edition of the
Installation Codes for Gas Burning Appliances, CAN
1-B149.1 & .2. The Canadian Gas Codes are available
from:Canadian Gas Association
55 Scarsdale Road
Don Mills, Ontario
M3B 2R3
Special Precautions
Liquefied petroleum (LP) gas is heavier than air.
Therefore, a pool heater using LP gas is subject to
special installation rules. Consult local codes and fire
protection authorities about specific installation
restrictions.
Fuel gas and its combustion products are known
to cause cancer or harm the reproductive process.
Follow these installation instructions and applicable
codes exactly to avoid this.

Page 2
2B. Heater Assembly and Preparation
The Hi-E2can be installed in a variety of ways,
some of them requiring preparation or assembly in the
field. In all cases, condensate tubing and fittings,
which are provided with the heater, must be connected
and routed. Water connections are provided on the
right side of the heater but can be changed to the left
side by reversal of the water headers.
It is best to handle these preparations before the
heater is in its final location. Instructions are provided
in subsequent sections of this document.
Installation at High Elevation
The Hi-E2has a venturi-type combustion system
which does not require modification for operation at
high elevation. In this type of system, air and fuel gas
density changes are automatically compensated for,
assuring proper air/fuel mixture. Heating capacity is
reduced about 3 percent per 1000 feet (305 meters)
above sea level. In general, efficiency at high elevation
is equal to or better than at sea level.
2C. Heater Location
The Hi-E2may be installed indoors or outdoors
as outlined in later sections. When installed indoors,
combustion air will often be piped to the heater and
this requirement may affect the choice of location (see
later section on air for combustion and ventilation).
Both indoor and outdoor installations require provision
of means for disposal of combustion condensate per
section 2H.
Install the heater at least 5 feet (1.52 meters)
from the inside wall of the pool or spa unless the heater
is separated from the pool or spa by a five-foot (1.52
meter) high solid fence, wall or other permanent
barrier.
When pool equipment is located below the pool
surface, a leak from any component can cause large
scale water loss or flooding. Teledyne Laars cannot be
responsible for such water loss or flooding or resulting
damage. Location of the heater below or above the
pool deck affects operation of its water pressure
switch. See sections on water piping and heater start-
up for more information about this.
WARNING
When pool equipment is located below the
pool surface, a leak from any component can
cause large scale water loss or flooding.
Teledyne Laars cannot be responsible for
such water loss or flooding or resulting
damage.
Locate the heater in an area where water leakage
will not result in damage to the area around the
appliance or to a structure. If forced to locate the
heater where water leakage may cause damage, provide
a suitable pan with drain under the heater. This pan
must not restrict air flow or heater functions.
In selection of a location, disposal of combustion
condensate must also be considered. The heater can
produce three gallons of condensate water per hour
under some operating conditions. Means to drain this
condensate must be available or special provisions,
such as a condensate pump must be provided. See later
sectiononcondensatedisposal.
2D. Installation Clearances
Clearances between the heater and combustible
material must be per Table 1.
Surface/Component Minimum Clearance
Inches (mm)
Rear & Blank Side 2 (55)
Pipin
g
Side 12 (305)
Front 18 (455)
Top - Indoors 6 (150)
Top - Outdoors Open (See Note)
Floorin
g
Combustible
Vent 0
Table 1. Installation Clearance Requirements.
NOTE: See Outdoor Installation section
regarding roof overhang.
These clearances are the minimum acceptable.
Whenever possible, larger clearances should be
provided to assure adequate room for service
operations. Note that gas piping must be provided
through the left side of the unit and that the combustion
air duct, when provided, also enters through the left
side. See later section on combustion air, and also the
section on water piping.
Do not install the heater on carpeting or similar
material.
2E. Outdoor Installation
Locate the heater in an open, unroofed area and
maintain the clearances shown in Table 1. Do not
locate the heater below or adjacent to any doors,
windows, louvers or grates, etc., which connect in any
way with an inhabited area of a building, even through
another building such as a garage or utility room (see
Figure 1). Do not locate the heater below an outdoor
deck, unless treated as an indoor installation with
adequate clearances and proper venting to a location
away from the deck.

Hi-E2 Page 3
located in. A two-pipe system (sometimes referred to
as “direct vent” or “sealed combustion”) has a vent
pipe plus a pipe bringing air directly to the heater's
combustionsystem.
Section 2G-2 specifies requirements for provision
of combustion and ventilation air for one-pipe
installations. Section 2G-3 covers two-pipe
installation.
An important consideration in selecting one or
two pipe installation is the quality of the combustion
air. Indoor air is sometimes contaminated with various
household or pool sanitation chemicals which can
cause corrosion in the heater combustion system.
Unless the indoor air is known to be free of these
materials, two pipe installation is strongly
recommended.
2G-1.Preparation of Heater For Indoor
Installation
If the Hi-E2is to be installed indoors, its exhaust
discharge grille must be converted to an exhaust pipe
configuration. The necessary vent collar, gasket and
screws are shipped packaged within the heater. The
Figure 1. Outdoor heater location.
Figure 3. Vent collar assembly for indoor installation.
Figure 2. Removal of outdoor exhaust grille.
If the heater is installed close to a structure,
protect it from rain water runoff by means of gutters,
roof water diverters or similar measures. Do not locate
the heater close to irrigation sprinklers. Water from
sprinklers may damage controls and electronic
components.
Because the Hi-E2is very efficient, combustion
system exhaust gases are moist. Do not locate the
heater such that this exhaust will impinge on
structures or vegetation which may be damaged by
combustioncondensate.
WARNING
In United States
Do not install the heater with the vent within 4
feet (1.22 m) of any opening into a building.
In Canada
Do not install the heater with the vent within 10
feet (3.05 m) of any opening into a building.
2F. Outdoor Shelter Installation (Canada)
An outdoor shelter is an unoccupied enclosure
whichdoesnotcommunicatedirectlywithoccupied
areas. The Hi-E2may be installed in such a shelter
only when the installation is in accordance with local
codes and the most recent edition of Standard CAN/
CGA B-149. These codes and standards and Teledyne
Laars require that the heater be properly vented as
outlined in this manual. Other requirements also apply,
such as provision of ample uncontaminated air for
combustionandventilation.
2G. Indoor Installation
The Hi-E2can be located indoors when provided
with “one-pipe” or “two-pipe” systems for combustion
air and combustion product venting. A one-pipe
installation has only a vent pipe, and air for
combustion must be provided to the room the heater is

Page 4
2G-3a. Connection of Combustion Air Pipe
A collar for combustion air pipe connection is
provided in the heater at the inlet of the filter box. As
shown in Figure 4, the combustion air pipe is routed
through the side of the heater to the filter box
connection. Remove the cover plate from the left side
panel to provide access for the air pipe.
2G-3b. Piping Materials
Vent piping must be corrosion resistant because
combustion condensate is usually present on its
internal surfaces. Only the following materials are
acceptable for vent piping:
PVC Class 100, Class 125 or Schedule 40
CPVC Schedule40
29-4C®Stainless steel venting materials listed for
ventingofcondensing gas-firedappliances.
29-4C®isatrademarkofAlleghenyTeledyne.
WARNING
Do not store any chemicals, cleaners, or other
corrosive material near combustion air
openings or in the room. Avoid location of
dryer vents in the vicinity of combustion air
openings. Failure to prevent corrosive
materials from mixing with combustion air can
result in reduced heater life and unsafe heater
operation.
2G-3. Two-Pipe Installation (Direct Vent)
Thissection specifiesinstallationrequirements
for combustion air and vent piping for “two pipe”
installations. A two-pipe system provides isolation of
the Hi-E2combustion system from the space in which
the heater is installed. It has not only a vent pipe, but
also a combustion air pipe to provide air directly from
the outdoors. Research studies have shown that
contaminants which may corrode internal heater parts
are typically at much lower levels in outdoor air than
in air from indoors.
Figure 4. Connection of combustion air pipe to heater.
conversion can be done quite simply as follows (see
Figures 2 and 3):
1. Remove the vent exhaust grille by removing
the four screws which retain it. The grille, its
gasket, and the screws may be discarded.
2. Place the vent collar gasket on the top of the
heater aligning its center hole and screw holes
with those in the top of the heater.
3. Place the vent collar over the gasket and
fasten it in place with the screws and
lockwashers provided. Be sure that all
components are properly aligned. Screws
must be tightened enough to assure a sealed
joint without deforming the vent collar.
2G-2.Combustion Air Requirements for
One-Pipe Installation
One-pipe indoor installations must have specific
provisions for supply of combustion and ventilation air
to the room in which the heater is located. Two air
openings must be provided — one near the ceiling and
one near the floor. When air is provided directly
through an outside wall, each opening must have at
least one square inch (6.5 square cm) of area per 4000
BTU/h of heater input. When air is provided indirectly
through ducts from the outside, the openings and
passages must have at least one square inch of area per
2000 Btu/h of heater input. These requirements are
interpreted in Table 2.
Model
Required net free area in square inches (sq. cm)
for each of 2 openings - one near ceiling and
one near floor
Directly Throu
g
h an
Exterior Wall Throu
g
h
Horizontal Ducts
220 55 (355) 110 (710)
350 88 (570) 175 (1130)
Table 2. Required Net Free Area of Openings for
Combustion and Ventilation Air.
Note that the numbers indicate the net free area
— after allowing for the blockage of grille bars, etc.
See applicable local codes and the previously-cited
national codes for details. Even though codes may
permit it, Teledyne Laars does not recommend
installations with only “infiltration” as the means for
provision of combustion air.
See Section 2G-3c for vent pipe sizing.

Hi-E2 Page 5
Table 3. Maximum Combined Length of Combustion Air and Vent Piping in Feet.
Table 3 specifies the allowable length of piping for
various situations.
The following examples illustrate use of table 3:
1. A Model 350 heater is to be installed in a one-
pipe system (see Figure 5). The vent pipe is 42
feet long and has five elbows. Per Table 3, 5"
piping must be used. (Only 16 feet of 4" vent pipe
would be allowable.)
2. A Model 220 heater is to be installed in a two-
pipe system (see Figure 6). The combustion air
pipe is to be 13 feet long with three elbows and
the vent pipe is to be 9 feet long with one elbow.
Since the total is 22 feet and four elbows, 4" pipe
must be used. (Table 3 indicates that the
maximum length of 3" pipe is 11 feet for a system
with four elbows.)
2G-3d.Combustion Air and Vent Pipe
Installation
The Hi-E2must be vented to the outdoors. It must
not be vented in common with any other appliance,
even if that appliance is of the condensing type.
Common venting can result in severe corrosion of the
Hi-E2or of the other appliances or their venting, or
escape of combustion product gases through such
appliances or vents. Do not vent the Hi-E2to a
fireplacechimney or building chase.
Combustion air ducting, when provided, must not
be shared with any other appliance or with another Hi-
E2. Doing so may result in flow of air through the
other appliances instead of directly from the outdoors.
The combustion air intake and vent outlet must
be located exterior to the building and in the same
pressure zone - i.e. both through the roof or both
through a side wall. The vent terminal must be located
in accordance with local codes, as applicable, and in
accordancewiththefollowing:
1. Locate the vent terminal so that it will not be
damaged by pedestrians and other traffic, and so
that the discharge is not offensive. The National
Fuel Gas Code requires a through-wall vent
terminal be at least 7 feet (2.13 m) above grade if
located at a public walkway.
Figure 5. “One-pipe” installation.
4'
8'
18'
10'
2'
TotalLength:42'
TotalElbows:5
Figure 6. “Two-pipe” installation.
EHE350
4'
7'
4'
5'
2'
Combustion
AirPipe
Vent
Pipe
EHE220
Comb.
Air Vent Total
Length 13' 9' 22'
Elbows 3 1 4
Combustion air piping may be single-wall
galvanized steel pipe or any of the above materials.
2G-3c.Size and Length of Combustion
Air and Vent Piping
Piping for combustion air and venting must be
large enough to avoid restriction of the heater
combustion system. Pipe diameter, number of elbows
and length of pipe determine how much it restricts flow
to or from the heater. Also, a large heater requires
larger pipe than a small heater because it operates with
higher flow of combustion air and exhaust products.
Model Pipe Size
Inches (cm)
Number of Elbows
12345678910
Total Len
g
th of Pipe - Feet (m)
220 3" 35 (10.6) 27 (8.2) 19 (5.8) 11 (3.4) NA NA NA NA NA NA
4" 173 (52.7) 163 (49.6) 153 (46.6) 143 (43.5) 132 (40.2) 122 (37.1) 112 (34.1) 102 (31) 92 (28) 81 (24.6)
350 4" 61 (18.6) 50 (15.2) 39 (11.9) 27 (8.2) 16 (4.8) NA NA NA NA NA
5" 225 (68.6) 211 (64.3) 197 (60) 184 (56) 170 (51.8) 157 (47.8) 143 (43.5) 130 (39.6) 116 (35.4) 103 (31.4)

Page 6
2. Locate the vent terminal so the vent exhaust does
not settle on building surfaces and other nearby
objects. Vent products may corrode such surfaces
or objects.
3. Locate the vent terminal at a sufficient horizontal
distance from any gas or electric metering,
regulating or relief equipment. In the United
States, this distance must be at least 4 feet
(1.21 m). In Canada, it must be at least 10 feet
(3.04 m).
4. Locate the vent terminal at a sufficient horizontal
distance from any building opening. Take special
care to assure that combustion products do not
enter a building through windows, doors,
ventilation inlets, etc. In the United States, this
distance must be at least 4 feet (1.21 m). In
Canada, it must be at least 10 feet (3.04 m).
As shown in Figures 8 and 9, the combustion air
intake and the vent outlet must be installed no closer
together than 18" (45.7cm) and no farther apart than
60" (1.5m). The combustion air inlet opening must
face downward to prevent entry of rain or snow. The
vent outlet must discharge away from the combustion
air inlet - normally in a horizontal direction when on a
wall and vertically upward when on a roof. Both
should terminate at least 12" (30.5cm) above the snow
accumulationlevel. In locations with freezing climate,
extension of the vent pipe outside of the building
shouldbe minimized. The insect screens provided with
the heater must be installed at the combustion air and
vent pipe openings as shown in Figure 10. Insect
screens are sized to fit the inside of a 5" PVC pipe
fitting. Trim them as necessary for smaller pipe sizes.
Connect the vent pipe to the heater vent collar
with an air-tight corrosion-resistant clamp. The
connection must not allow leakage of combustion
products into the space but should be removable for
service. See Figure 7.
Connect the combustion air pipe to collar of the
air filter box. For this combustion air pipe only, sheet
metal pipe is most convenient and can be screwed
directly to the collar. Seal the joint with silicone sealer
or similar mastic material.
Install vent piping with a continuous rise of at
least 1/4" per foot (20 mm per meter) away from the
heater. This will assure that any condensate forming in
the vent pipe will flow back to the heater where it can
be disposed of properly.
Support vent piping with suitable hangers so its
weight does not bear on the heater or building
penetration and so that piping joints are not strained.
Support horizontal runs at intervals no greater than
6 feet (1.82 meters), and closer if necessary to avoid
sagging. Sagging can trap condensate water and block
thevent. Figure 8. Vent and Combustion Air Terminals at
Exterior Wall.
Figure 7. Indoor Vent Connection, Hi-E2 Pool Heater
PVCAdapter
whenrequired
4" PVC Pipe
Field-provided
Clamping
Connector
withNeoprene,
Nitrileor EPDM
Sleeve
Hi-E2VentCollar
7"min.
12"min.
tomaximum
snowlevel
Gradelevel
ornormal
snow
18"min.
60"max
6"min.
Combustion
Air Pipe
Vent Exhaust
Pipe
SpecialInsectScreens Installed
(SeeFig. 10)

Hi-E2 Page 7
Figure 10. Installation of Insect Screens.
Installspecial
insectscreen at
endofpipe
insidecoupling
orelbow. Cut
tosize as
necessary.
Combustion
AirPipe
Elbow
Vent
Exhaust
Pipe
Trap
Figure 12. Condensate Drain and Trap.
Overflow
To
Disposal
WaterLevel
PushedDown
Slightly
WaterLevel
PulledUp
2"-3"
(50-75mm)
Condensate
From
Collector
Drain
CondensateFrom
Vent/BlowerDrains
1/4" - 3/8"
(6-10mm)
To
Disposal
Vent
Drain
Figure 11. Condensate Drainage Components.
Collector
Drain
Trap/
Neutralizer
Blower
Drain
Plumbingvent
roofboot
A=Maximumsnowaccumulationlevelplus 12"
Figure 9. Vent and Combustion Air Terminals at Roof.
Combustion
AirPipe
Elbow
InsectScreens
Installed
(SeeFig. 10)
Vent
Exhaust
Pipe
A
A
18" min.
60" max
Both combustion air and vent piping joints must
be sealed. Metal combustion air pipe joints should be
fastened with screws and sealed with permanent sealer
or tape. Plastic vent pipe joints must be made with
solvent cement listed for such use. Joints in 29-4C®
stainless steel pipe must be sealed in accordance with
its listing. Connection of combustion air and vent
piping to the heater should be serviceable — i.e.
removable for heater service.
2G-3e.Room Ventilation
The room a Hi-E2is installed in must be provided
with adequate ventilation. Like other gas-fired
appliances, the Hi-E2releases heat to its environment,
and a room with no ventilation may become too warm.
In one-pipe installations, the normal (code-
required) provisions for combustion air also assure
reasonable ventilation of the room. If a two-pipe
system is installed, ventilation must be provided by
other means, such as through grilles or openings or
with a small fan.
2H. Condensate Disposal
Inahigh-efficiencycombustionprocess,
combustion product gases are cooled so much that
liquid water is condensed. Flow of this “condensate”
can be quite high. When pool water is very cold, as
much as two or three gallons of condensate can be
produced in an hour. Condensate is mildly acidic.

Page 8
Before treatment, its “pH” is typically in the 3.5 to 6.0
range.
Handling and disposal of condensate is not
complicated, but it must be done correctly to prevent
problems or complaints. A trap/neutralizer assembly is
provided with the heater to simplify installation. This
assembly is easily installed in the base of the heater.
Figure 11 illustrates its installation and the routing of
drain tubes.
To install the condensate assembly, first install
the short length of 5/8" I.D. tubing on the barbed
fitting on the bottom of the condensate collector. Then
drop the condensate tray into the opening in the base
pan of the heater, bending the 5/8" tubing as necessary
to get the tube into the tray. Readjust the 5/8" tubing
so that its lower end is 1/4" - 3/8" above the bottom of
the tray. The tray can be positioned with the outlet
fitting to the right, as shown in Figure 11, or with the
fitting to the left, depending on the direction required
for condensate disposal. Connect the piece of 1/2" I.D.
tubing to this outlet fitting and route it out of the heater
through the hole in the side of the base panel. This tube
carries condensate to the drain. If this disposal tube is
routed to the left, remove the plug button from the hole
on the left side of the base panel and push it into the
hole on the right side.
Connect the remaining short piece of 3/8" I.D.
tubing to the barbed tee fitting in the tubing
immediately in front of the blower. Position this tubing
so that its bottom end is 1/4"-3/8" above the bottom of
the condensate tray. This tube provides drainage for
the vent duct and blower.
A package of limestone gravel neutralizer is
provided with the condensate assembly. Place this
gravel in the tray after installing and properly
positioning all tubes. Be sure that a limestone pebble
does not plug any of the tubes. Place the cover on the
tray when this is done.
It is important that there be no sagging sections
of tubing to trap water. Drainage to the trap and out of
the trap to the drain must be assured by continuous
downward routing of these tubes. It may be necessary
to elevate the heater to provide downward routing. The
outlet of the disposal tube must be open to the air.
If a gravity drain is not available, a condensate
pump must be provided in the field. Suitable
condensate pumps are available commercially at air
conditioningequipmentdistributors.
Incorrect installation of the condensate assembly
or tubing can result in overflow or waterlogging of the
vent. In normal operation, water accumulates in the
tray at the level of the outlet fitting, and this provides a
“waterseal”whichaccommodatescombustionsystem
pressures. Figure 12 illustrates the water seal. Note
that water is “pulled” up toward the condensate
collector pan and is pushed down slightly by the vent/
blower drain. If there is no water seal, air rushes into
the collector drain, preventing normal drainage of
condensate water, until vent drainage provides the seal
(see Section 2L, Start-Up and Adjustment).
The installer must be sure to take whatever
measures are necessary to prevent property damage by
condensate overflow. If the heater location is such that
this water can directly or indirectly damage a building,
furnishings or other property, an overflow pan or other
appropriate preventative measure should be provided.
2I. Gas Supply and Piping
Before installing gas piping, check the rating
plate on the heater to be sure that the heater is for use
with the correct (available) gas. Make sure that gas
supply pressure is adequate per the requirements in
Table 4. Note that the system must be capable of
providing these pressures while the heater is
operating.
Supply Pressure Minimum Maximum
Natural Gas 5 Inches WC 10.5 Inches WC
(125 mm WC) (265 mm WC)
LP Gas 11 Inches WC 14 Inches WC
(280 mm WC) (350 mm WC)
Table 4. Gas Supply Pressure Requirements
Gas piping must be large enough to provide the
required gas flow rate without excessive pressure drop.
Table 5 specifies pipe sizes which will limit pressure
drop to 0.5 In WC (125 Pa), based on the National
Fuel Gas Code, ANSI Z223.1.
Model Natural Gas LP Gas
0-50'
(0-15m) 50-100' (15-30m) 100-200' (30-60m) 0-50' (0-15m) 50-100' (15-30m) 100-200' (30-60m)
220 1" 1-1/4" 1-1/4" 3/4" 1" 1-1/4"
350 1-1/4" 1-1/4" 1-1/2" 1" 1-1/4" 1-1/4"
Table 5. Required Gas Pipe Size
Support gas piping properly so its weight does
not bear on the heater. Install a drip leg, a non-
restrictive shutoff valve and a union on the gas supply
line outside of the heater (see Figure 13).
Before operating the heater, test the gas supply
system, including all connections, for leaks using a
soap solution. Do not use a flame or any ignition
source for leak detection. Disconnect the heater and
its individual gas shutoff valve during pressure testing
if the test pressure is higher than 1/2 psig (3.34 kPa).
If the pressure is 1/2 psig (3.45 kPa) or lower, close
the manual valve on the heater gas control during
testing.