Hayward Pool Products UHXNEGVT1150 User manual

HAYWARD POOL PRODUCTS, INC.
Indoor Vent Installation Instructions
Negative Pressure (Vertical) Venting Kits
for Universal H-Series (Forced-Draft) Heaters
IMPORTANT NOTES:
1. This kit is intended to be used only with Hayward Universal H-Series (forced-draft) gas heater models built after Apr 30,
2008, serial # 21130804103872001. These heaters may be identified by inspection of the heater rating plate. The model
number should match one of those listed in Table 1, and on models H250FD, H350FD, and H400FD, the serial number
should indicate a manufacture date of Apr 2008 or later. If the manufacture date is Apr 2008, the serial number must be
greater than 03872. Table 2 may be used to extract the date of heater manufacture based on heater serial number. If it is
necessary to install this kit in a heater built before the above listed manufacture date, a separate kit is needed to update
your heater. Install kit FDXLRGK1250, FDXLRGK1350, or FDXLRGK1400 (depending on your heater model) before
installing the indoor vent kit. All models H150FD, H200FD, and H300FD are compatible with this kit.
2. This instruction sheet is intended for only the heater service parts kits listed in Table 1.
3. This kit enables indoor installations where the exhaust vent pipe termination is required to be vertically terminated a
minimum of 3 ft above the roof and a minimum of 2 ft above any portion of a building within 10 ft horizontally. This kit does
not allow horizontal vent termination. Please refer to the instructions for kit part numbers UHXPOSHZ1150,
UHXPOSHZ1200, UHXPOSHZ1250, UHXPOSHZ1300, UHXPOSHZ1350, and UHXPOSHZ1400 for other indoor venting
applications.
1301666601 rev B
Page 1 of 10
TABLE 1
TABLE 2
Serial Number Format Year (y)
21130ymm1xxxxx001
7=2007
8=2008
9=2009
0=2010
01=Jan
02=Feb
03=Mar
04=Apr
05=May
06=Jun
07=Jul
08=Aug
09=Sep
10=Oct
11=Nov
12=Dec
Month (mm)
Note: "xxxxx" indicates the serial number.
WARNING Failure to comply with the installation instructions in this instruction sheet may result in
equipment damage, fire, asphyxiation, or carbon monoxide poisoning. Exposure to
products of incomplete combustion (carbon monoxide) can cause cancer, birth defects, or other reproductive harm.
4. Installation of this kit should be conducted only by a qualified technician, specifically trained and experienced in the
installation of this type of heating equipment. Some states or provinces require that installers be licensed. If this is the
case in the state or province where the heater is located, the contractor must be properly licensed.
5. This kit should be installed in accordance with all local and state codes. The installation of this kit must conform to
the latest edition of the National Fuel Gas Code (ANSI Z223.1/NFPA 54), and with the requirements of the local
authority having jurisdiction. Design certification of this kit is in compliance with ANSI Z21.56/CSA 4.7. For Canadian
installations, this kit is to be installed in accordance with the standard CAN/CGA B149.1 - Installation Codes for Gas
Burning Appliances and Equipment and/or local codes.
ENGLISH
Part Number Description
For Use With
Heater Models
Vent Pipe Limitations Vent Pipe Material
Vent Termination
Requirement
UHXNEGVT1150 H150FD
UHXNEGVT1200 H200FD
UHXNEGVT1250 H250FD
UHXNEGVT1300 H300FD
UHXNEGVT1350 H350FD
UHXNEGVT1400 H400FD
Indoor Vent Adapter
Kit, Negative Pressure,
Vertical Venting
Applications
50 ft max vertical height,
25 ft max horizontal length
(horizontal length cannot exceed
1/2 of vertical height),
3 elbows max
Single or Double Wall
Galvanized Non-
Sealed Vent Pipe
Vertical Only,
Termination Above Roof
of House/Building

1301666601 rev B
Page 2 of 10
CONTENTS OF THE KIT
Clearances
The heater must be installed such that the installation and
service clearances from combustible materials shown in
Table 3 are maintained. This heater may be installed on
combustible floors. Do not install heater in a closet.
Air Supply
Indoor installations and outdoor shelters (confined spaces)
must be provided with adequate combustion and
ventilation air vents to assure proper heater operation.
These vents must be sized according to the requirements
stated in paragraph A or B below (whichever applies to the
installation). These vents must never be obstructed when
heater is in operation.
When air blowers are used in spa/hot tub installations and
are located in proximity to the heater, caution must be
observed to ensure sufficient combustion air is available to
the heater for proper combustion. A separate blower air
duct is recommended.
(A) All Air Supply From Inside the Building:
The confined space shall be provided with 2 permanent
openings communicating directly with an additional
room(s) of sufficient volume so that the combined volume
of all spaces meets the criteria for an unconfined space (a
space whose volume is not less than 50 cubic feet per
1,000 btu/hr). The total input of all gas utilization
equipment installed in the combined space shall be
considered in making the determination. Each opening
shall have a minimum free area of 1 square inch per 1,000
btu/hr of the total input rating of all gas utilization
equipment in the confined space, but not less than 100
square inches. See Table 5. One opening shall be within
12 inches of the top and one within 12 inches of the
bottom of the enclosure.
(B) All Air Supply From Outdoors:
The confined space shall be provided with 2 permanent
openings, once commencing within 12 inches of the
bottom of the enclosure. The opening shall communicate
directly, or by ducts, with the outdoors or spaces (crawl or
attic) that freely communicate with the outdoors.
NOTES ON INDOOR INSTALLATIONS
When communicating with the outdoors (either directly
or through vertical ducts), each opening shall have a
minimum free area of 1 square inch per 4,000 btu/hr of
total input rating of all equipment in the enclosure.
See Table 5.
1.
When communicating with the outdoors through
horizontal ducts, each opening shall have a
minimum free area of 1 square inch per 2,000
btu/hr of total input rating of all equipment in the
enclosure. See Table 5.
2.
When ducts are used, they shall be of the same
cross-sectional area as the free area of the
openings to which they connect. The minimum
dimension of rectangular air ducts shall not be
less than 3 inches.
3.
TABLE 4
Heater Panel
Required
Clearance
Top 36 inches
Front Unobstructed
Back 6 inches
Water Connection Side 12 inches
Side Opposite Water
Connection
6 inches
For more detailed methods of providing air for combustion
and ventilation, refer to the latest edition of the National
Fuel Gas Code (ANSI Z223.1/NFPA 54).
Vent Sizing
Size the vent pipe according to the venting tables in the
National Fuel Gas Code (ANSI Z223.1/NFPA 54) for a
Category I gas appliance using single-wall or double-wall
(Type B) gas vent. Vent pipe diameter should not be less
than the size of the vent pipe adapter on the heater (see
Table 4). The maximum vent height cannot exceed 50 ft.
The total lateral (horizontal) length cannot exceed 1/2 of
the total vent height. The system may have up to 3 90-
degree elbows maximum. Single-wall vent may be used
in conditioned spaces only. Clearance to combustible
materials for single-wall vent is 9 inches. Double-wall
(Type B) vent must be used in non-conditioned spaces.
Qty Description
1
Vent Pipe Adapter for Negative Pressure Galvanized Vent
Pipe
1 Flue Cover Plate with Hole for Vent Pipe
12 #10 Sheet Metal Screws
1
Blower Inlet Restrictor Plate
(UHXNEGVT1250 and UHXNEGVT1400 only)
1 Vent Pressure Switch with Tubing and Jumper Wire
ENGLISH
When installing a heater below ground (in a pit),
combustion and ventilation air openings must be
provided as shown in Figure 1. Each opening
shall have a minimum free area of 1 square inch
per 250 btu/hr of total input rating of all equipment
in the pit. See Table 5. Below-ground (pit)
installations must be natural gas only.
4.
Indoor Vent Kit Part
Number
Heater
Model
Vent Pipe
Diameter
UHXNEGVT1150 H150FD
UHXNEGVT1200 H200FD
UHXNEGVT1250 H250FD
UHXNEGVT1300 H300FD
UHXNEGVT1350 H350FD
UHXNEGVT1400 H400FD
6 inch
8 inch
TABLE 3

1301666601 rev B
Page 3 of 10
Ground Level
Ventilation
Air Combustion
Air
Air Duct from
Ground to Base
Drip Tee
Gas Cock
Sediment Trap Level Flooring
or Slab
Rise of 1 inch
per foot
Vent Cap
Free Area per
Btu
Requirement
Total
Input
(btu/hr)
Combustion Air
Free Area
Required
(sq. in.)
Ventilation Air
Free Area
Required
(sq. in.)
150,000 150 150
200,000 200 200
250,000 250 250
300,000 300 300
350,000 350 350
400,000 400 400
150,000 75 75
200,000 100 100
250,000 125 125
300,000 150 150
350,000 175 175
400,000 200 200
150,000 37.5 37.5
200,000 50 50
250,000 62.5 62.5
300,000 75 75
350,000 87.5 87.5
400,000 100 100
150,000 600 600
200,000 800 800
250,000 1000 1000
300,000 1200 1200
350,000 1400 1400
400,000 1600 1600
1 sq. in. per
1,000 btu/hr
(paragraph A)
1 sq. in. per
2,000 btu/hr
(paragraph B-2)
1 sq. in. per
4,000 btu/hr
(paragraph B-1)
1 sq. in. per 250
btu/hr
(paragraph B-4)
TABLE 5
FIGURE 1
ENGLISH

Listed
Cap
Listed Gas
Vent
H (minimum) - Minimum height from
roof to lowest discharge opening
Lowest discharge opening
Roof pitch is x/12
1. If connected, turn pump, main gas valve, and heater
power off.
2. Locate the heater as close as practical to the gas vent
exit.
3. Remove the countersunk phillips-head screws and
remove the flue cover panel on top of the heater and
discard. Save the countersunk screws as they will be
re-used later.
4. Remove the screws that fasten the heat barrier to the
heater. Remove the heat barrier and discard. See
Figure 3.
5. Remove the screws that fasten the rain guard to the
heater. Remove the rain guard and discard. See
Figure 3.
6. Install the vent pipe adapter plate included in this kit
into the heater using the #10 screws included with this
kit. Ensure the white gaskets are in place under the
vent pipe adapter plate before installing. See Figure 4.
7. Install the new flue cover included with this kit over the
vent pipe adapter and secure with the countersunk
screws from step 3 above. See Figure 5.
8. Remove heater front access door.
9. Install the vent pressure switch provided with this kit
inside the heater using 2 #10 screws as shown in
Figure 6. If you are refitting a heater with an
FDXLRGK1xxx kit, you will need to drill these screw
holes.
10. Remove the rubber cap from the blower outlet
pressure tap and discard. See Figure 7 for blower tap
location.
11. Attach the pressure switch tubing to the pressure tap
on the blower outlet. See Figure 7 for blower tap
location. On some older model heaters, the pressure
tap is located on the opposite side of the blower
housing as shown in Figure 7.
12. Unplug the in-line quick connect on the red wire in the
heater wire harness and attach the 2 wires to the vent
pressure switch. See Figure 6. If you are refitting a
heater with an FDXLRGK1xxx kit, you will need to
splice into the wire harness red wire which attaches to
the water pressure switch. The vent pressure switch
should be in series with the water pressure switch.
1301666601 rev B
INSTALLATION PROCEDURE
Page 4 of 10
Vent Termination
Vent extending through a roof or wall must be listed
double-wall (Type B) vent, and pass through an approved
roof jack, or roof thimble. A listed vent cap must be used.
Gas vents that are spaced less than 8 ft horizontally from
a vertical wall or similar obstruction shall terminate not less
than 2 ft above any portion of a building within 10 ft. Gas
vents that are spaced 8 ft or more horizontally from a
vertical wall or similar obstruction shall terminate above
the roof a distance Hbased on the roof pitch. Using the
roof pitch, find the minimum value of Husing Figure 2 and
Table 6.
NOTES ON INDOOR INSTALLATIONS (continued)
TABLE 6
Roof Slope
Min. Height H from
Roof to Lowest
Discharge Opening
Flat to 6/12 1.0 ft
Over 6/12 to 7/12 1.25 ft
Over 7/12 to 8/12 1.5 ft
Over 8/12 to 9/12 2.0 ft
Over 9/12 to 10/12 2.5 ft
Over 10/12 to 11/12 3.25 ft
Over 11/12 to 12/12 4.0 ft
Over 12/12 to 14/12 5.0 ft
Over 14/12 to 16/12 6.0 ft
Over 16/12 to 18/12 7.0 ft
Over 18/12 to 20/12 7.5 ft
Over 20/12 to 21/12 8.0 ft
FIGURE 2
13. If installing the kit on models H250FDN,
H250FDP, or H400FDP, you must also replace
the existing blower air inlet restrictor with the
new one included in the kit.
a) Remove the 4 #10 hex head screws that
fasten the plate to the blower, and remove
the blower air plate and discard. Save the
4 screws as they will be needed to install
the new plate.
ENGLISH
b) Install the new blower plate included in the kit
using the 4 screws. It may be helpful to drive the
screws in and out of the plate outside of the
heater first to "thread" the holes before installing it
in the heater. See Figure 7.
14. Re-install heater front door.
15. Connect vent piping system to heater vent adapter.
16. If connected, turn pump, main gas valve, and heater
power back on.
17. Activate heater and check for proper function.

1301666601 rev B
Page 5 of 10
FIGURE 3
FIGURE 4
FIGURE 5
FIGURE 6
FIGURE 7
Heat Barrier
Rain Guard
Vent Adapter
Flue Cover
Vent Pressure
Switch
Blower
Pressure
Tap
Blower
Air Inlet
Plate
Vent Pressure
Switch Tubing
ENGLISH