USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
Page 7 of 12
Spa Blower
ISSPB Rev-A
3.
Installation Guidelines
a.
Install blower vertically at least one foot (305 mm) above the water line in a well ventilated location free of
debris, chemicals and sprinklers.
b.
If the blower is to be installed more than 25 feet from the spa, it is necessary to install a Hartford loop that is
1 foot above the water line and as close as possible to the spa.
c.
Install check valve in a vertical orientation in an easily accessible location above water level so that it can be
serviced.
d.
Use 2" supply line from the blower to the spa. At the spa you can reduce down to 1.5" pipe to feed the jets,
air caps, or air channel.
e.
Do not glue blower to the supply line. Glue fumes may cause an explosion when the blower is started. You
can secure the blower to the supply line by pre-drilling a small hole through the neck of the blower and
securing with a screw.
f.
A loop and check valve must be installed at least 1 foot above water level if the blower is installed below
grade level.
g.
A loop and check valve must be installed a minimum of 1 foot above water level when supercharging water
jets.
4.
Blower Sizing for Air Channel
There are many variables to consider when choosing the proper size air blower for your spa or hot tub.
These include: water depth, the number and size of air holes, distance of blower from spa, number of 90 and 45 degree
turns, and the size of the supply line. Together these variables create back pressure on the blower as measured in
inches of water column (inches H2O). Compare your calculations with the chart below to determine the best size blower
for your spa.
a.
Measure maximum height of water above lowest section of air channel.
b.
For each 10 feet of 2" supply pipe, add 1" (inch) of water pressure.
c.
For each 90 degree turn, add 1/2" (inch) of water pressure.