Jandy JXi 200 Installation And Operation Manual - Caution
Page 19
ENGLISH
Jandy
®
Pro Series, JXi
™
Gas-Fired Pool & Spa Heater
|
Installation & Operation Manual
5.1
Pump Sizing
The flow bypass within the heater manifold will
accommodate flow rates delivered to the heater from a
minimum of 30 gallons per minute (gpm) to a maximum
flow of 100 gpm.
CAUTION
The system water pump must be capable of providing no less than
30gpmofflowthroughtheheater.Flowratesatlessthan30gpm
may cause nuisance operation causing the heater to turn off or dam-
age to the heater.
MODEL
MIN GPM (LPM)
MAX GPM (LPM)
JXI 200
30 (114)
100 (379)
JXI 260
30 (114)
100 (379)
JXI 400
30 (114)
100 (379)
Table 4.
Recommended Flow Rate Adjustment
Figure 8.
Head Loss Chart
4.0
5.0
6.0
7.0
8.0
9.0
8.0
10.0
12.0
14.0
16.0
18.0
20.0
JXi 200K BTU Heater
JXi 260K BTU Heater
JXi 400K BTU Heater
0.0
1.0
2.0
3.0
0.0
2.0
4.0
6.0
20
30
40
50
60
70
80
90
100
110
sig
n
Pr
ess
ur
e
Dr
op
(p
si)
De
s
esi
gn
H
ea
d
Lo
ss
(
He
ad)
D
Flow Rate
(GPM)
JXi VersaFlo™ Bypass
5.1.1
Manual Bypass Valve
A manual bypass valve is to be installed in any system in
which the pump flow exceeds 100 gpm to the heater.
• Connect ball valve between water inlet and outlet.
See inset “a.” in
Figure 7
.
•
Adjust the valve to bring the flow rate within the
acceptable range. See
Table 4
.
•
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:
Inordertoproperlyestablishheadlossatflowforafilter,
rememberthata“dirty”filtercantypicallyadd10psiofadditional
head loss (23 extra feet 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 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
Heaterfailureduetoinsufficientwaterflowisnotcoveredunderwar-
ranty. See measurements in the Head Loss Chart. See
Figure 8
.