Jandy JXi 400 - Pump Sizing

Page 56
Jandy
®
JXi
™
Gas-Fired Pool and Spa Heater | Installation & Operation Manual
Item Description Qty.
1
2
3
4
5
6
7
1 JXi Heater 1
2 Connector Flange 2
3 2” Sleeve 2
4 2” Gasket 2
5 Flange Bolt 4
6 Flange Washer 4
7 75 psi Pressure
Relief Valve Kit
1
13.3 Pump Sizing (from “Section 5.1 Pump
Sizing” on Page 23)
All JXi heaters utilize an internal bypass mechanism
and thermal regulator valve (TRV) to accommodate
fl ow rates delivered to the heater from a minimum of
30 gallons per minute (gpm) to a maximum fl ow of
100 gpm.
CAUTION
The system water pump must be capable of providing no less than 30
gpm of fl ow through the heater. Flow rates at less than 30 gpm may
cause nuisance operation causing damage to the heater or causing
the heater to turn off.
Model
Min gpm
(lpm)
Max gpm
(lpm)
JXi 260 30 (114) 100 (379)
JXi 400 30 (114) 100 (379)
Table 9. Recommended Flow Rate Adjustment
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
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
s
ign Pressure Drop
(psi)
De
s
esign Head Loss
( Head)
D
Flow Rate (GPM)
JXi 260K BTU Heater
JXi 400K BTU Heater
Figure 11a. Head Loss Chart