Page 18
ENGLISH
Zodiac
®
JXi
™
Gas-Fired Pool & Spa Heater
|
Installation & Operation Manual
5.1
Pump Sizing
The flow bypass within the heater manifold will
accommodate flows rates delivered to the heater from a
minimum of 114 Litres per minute (lpm) (30 gpm) to a
maximum flow of 379 lpm (100 gpm.)
CAUTION
The system water pump must be capable of providing no less than
114 lpm (30 gpm) of flow through the heater. Flow rates at less than
114 lpm (30 gpm) may cause nuisance operation causing the heater
to turn off or damage to the heater.
MODEL
MIN LPM (GPM)
MAX LPM (GPM)
JXI 200
114 (30)
379 (100)
JXI 370
114 (30)
379 (100)
Table 3.
Recommended Flow Rate Adjustment
Figure 7.
Head Loss Chart
27.6
34.5
41.4
48.3
55.2
62.1
JXi 200 MJ Heater
JXi 370 MJ Heater
0.0
6.9
13.8
20.7
si
g
n
P
re
ss
u
re
D
ro
p
(kPa
)
D
e
s
Flow Rate
(lpm)
JXi VersaFlo™ Bypass
*
* This heater comes equipped with the VersaFlo™
Integrated Bypass. For details please review the
included installation and operation manual.
80
100
120
140
160
180
200
220
240
260
280
300
320
340
360
380
400
420
Design H
ead L
oss (met
ers head)
2
2.5
3
3.5
4
4.5
5
5.5
6
0.0
.5
1
1.5
5.1.1
Manual Bypass Valve
A manual bypass valve is to be installed in any system in
which the pump flow exceeds 378 lpm (100 gpm).
Connect ball valve between water inlet and outlet. See
inset “a.” in
Figure 6
.
•
Adjust the valve to bring the flow rate within the
acceptable range. See
Table 3
.
•
Remove the valve handle to avoid tampering.
5.1.2
Pump Sizing for New Pool Construction:
When sizing a pump for the system, the head loss for all
system components must be added together when
determining the design flow rate. Component “Head Loss
at Flow” curves are available from equipment
manufacturers.
NOTE:
In order to properly establish head loss at flow for a filter,
remember that a “dirty” filter can typically add 69 kPa (10 psi) of
additional head loss, 7 extra meters (22 ‘) of head. This must be
considered when sizing a pump for a new pool system.
5.1.3
Pump Sizing for Replacement in an Existing Pool:
If the JXi heater replaces a different model of heater,
determine if the existing pump is capable of providing the
minimum flow of 114 lpm (30 gpm). JXi heaters are high
efficiency heaters. Heaters typical of this construction
may have higher head loss characteristics than the one
being replaced.
CAUTION
Heater failure due to insufficient water flow is not covered under war
-
ranty. See measurements in the Head Loss Chart. See
Figure 7
.
