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Section III. Installation
Equipment inspection:
O
n receipt of the heater equipment, inspect the
h
eater carton for damage. If any carton is damaged,
note it when signing for it. Remove the equipment
from the carton(s) and advise the carrier of any dam-
ages at once.
Important notice:
The instructions herein are intended for the use of
a qualified technician, specifically trained and experi-
enced in the installation of this type of heating equip-
ment. Some states or provinces require that installa-
tion be licensed. If this is the case in the state or
province where heater is located, the contractor must
be properly licensed.
WARNING: Failure to comply with the appli-
ance and vent package installation instructions
and service instructions in this manual may result
in equipment damage, fire, asphyxiation, or car-
bon monoxide poisoning. Exposure to products
of incomplete combustion (carbon monoxide) can
cause cancer and birth defects or other reproduc-
tive harm.
Conformance with codes:
The heater shall be installed in accordance with all
local and state codes. The heater installation must
conform to the National Gas Code ANSI Z223.1 (lat-
est edition) and with the requirements of the authority
having jurisdiction. Design Certification of the heater
is in compliance with ANSI Z21.56•CSA4.7.
For Canadian installations, the heater is to be
installed in accordance with the standards CAN/CGA
B149.1 and B149.2 – INSTALLATION CODES FOR
GAS BURNING APPLIANCES AND EQUIPMENT
and/or Local Codes, and if applicable, Standard CSA
C22.1 – CANADIAN ELECTRICAL CODE, Part 1.
Sea Level/high altitude installation:
The H-Series heaters may be installed up to 2,000
feet of elevation above sea level.
Location of heater:
Locate the pool/spa heater in an area where leak
-
age of heat exchanger or connections will not result
in damage to the area adjacent to the heater or to the
structure. When such locations cannot be avoided, it
recommended that a suitable drain pan, with drain
outlet, be installed under the heater. The pan must
not restrict air flow
.
This heater must be installed at least five feet from
the inside wall of a pool/spa unless separated from
the pool/spa by a solid barrier
.
This heater must be
installed also at least five feet from the wall of an
above-ground pool.
The heater must be installed such that the location
of the vent assembly outlet relative to adjacent public
walkways, adjacent buildings, openable windows, and
building openings complies with the National Fuel
Gas Code, ANSI Z223.1 and/or CAN/CGA B149
Installation Codes.
Flooring:
This heater can be installed on combustible flooring.
Reversible water connections:
This heater is designed so that it can be installed
with the water connections located on either the right
or left side. Heaters are shipped from the factory with
the water connections on the right side. To bring the
water connections to the left side, follow step-by-step
instructions below and refer to the illustration in
Figure 5. These procedures should be performed by
a trained service technician before the heater is
installed.
1. Remove four (hot) vent screws and remove
panel.
2. Remove heater top.
3. Remove screws from left and right side
access panels. Remove panels.
4. Remove the front panel.
5. Disconnect high limit wires and reroute them
to opposite side of heater. Disconnect the
thermistor leads from control panel and pull
through intermediate panel.
6. Remove pressure switch and tube.
7. Remove 12 nuts retaining front header and
carefully remove header.
CAUTION: By-pass and thermal governor may
become dislodged when removing front heater. They
must be reinstalled properly prior to reinstallation of
front header.
CAUTION: Header O-ring may be re-used if not
permanently deformed. if installing new O-rings,
Jack’s 327 Lube may be liberally applied to O-ring to
keep it in place during header installation.
8. Remove four screws retaining air deflector,
and remove air deflector.
9. Unplug wires and pressure tap tubes from
combustion blower
.
10. Remove screws retaining flue collector and
remove flue collector/combustion blower assembly.
1
1. Remove screws securing heat exchanger
from tube sheets on both front and rear of
heater.
5
Section II. Heater Sizing
Selecting the correct size heater:
F
actors influencing heater sizing include pool/spa
s
ize, average wind velocity, ambient temperature, and
desired increase in temperature over ambient temper-
ature, and desired increase in temperature over ambi-
ent. A pool/spa in a warm area with little or no wind
will not require as large a heater as one in a cool
windy location. Detailed sizing information is provided
below.
For a swimming pool:
1. Determine pool’s surface area in square feet.
For indoor pool installations divide the pool’s
surface area by 3.
2. Determine desired pool water temperature
(usually 78 - 82º F).
3. Determine average air temperature of coldest
month of use.
4. The temperature rise is difference between 2 & 3.
5. Locate in Figure 2 the surface area equal to or just
greater than the pool’s surface area and the
temperature degree rise and select the appropriate
heater model.
Figure 2 is based on 3
1
⁄2 MPH wind velocity and
elevation of up to 2,000 feet above sea level.
When not in use, keep pool covered to
reduce heat loss, chemical usage, and dirt load
on the filtering system.
For a spa or hot tub:
Determine spa capacity in gallons (surface area x
average depth x 7
1
⁄2).
The reference table lists the time required in min-
utes to raise the temperature of the spa/hot by 30ºF,
read to the left and select the appropriate heater
model.
This guide can be adjusted for other temperature
rises. For example, if a 15ºF increase in temperature
is desired, simply divide the time for 30ºF rise by the
ratio of 30/15=2.
NOTE: Heat losses and /or heat absorbed by
spa walls (such as concrete) or other objects will
add to the heat-up time.
Spa sizing is based on an insulated and covered
spa. Always cover spa or hot tub when not in use to
minimize heat loss and evaporation.
4
Temp. Rise F
Model
H250
25 3015 2010 35
2309
1540
1155
924 770 660
H400
3695 2463 1848 1478 1232 1056
H350
3233 2156 1617 1293 1078 924
Pool Surface Area In Square Feet
Figure 2 - Recommended Heater Model
Model
H400
Figure 3 - Recommended Heater Model
Spa/Hot Tub Size in Gallons
Time in Minutes to Raise Spa/Tub Temperature 30 F
200 300 400 500 600 700 800 900 1,000
9 14 19 23 28 33 37 42 47
H250
15 23 31 38 46 54 61 69 77
H350
11 16 21 27 32 37 43 48 54
1
5
7
12
10
4
2
6
8
11
9
3
Pool Surface
Area
Figure 1
Figure 4