Hayward Universal H-Series Low NOx Service/Installation: H150FDN H200FDN H25 - Page 26

Allowable Water Flow Rate Range, Manual Bypass valve - pool heater manual

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26 If the normal pump and filter system flow rate exceeds 125 gpm then a manual bypass valve must be installed as shown in Figure 21. Damage caused by flow rates outside this range will void the manufacturer's warranty. The installation is as follows: 1. Install a flow meter on the outlet line of the heater. 2. Adjust the manual bypass valve until the flow rate is within the flow rate range specified for the heater. 3. Once the valve is set, note the position and remove the valve handle to prevent further adjustment. Figure 20 Allowable Water Flow Rate Range Model Minimum Flow Maximum Flow Rate (GPM) Rate (GPM) H150FD H200FD 20 125 H250FD H300FD 25 125 H350FD H400FD 30 125 ATTENTION: Improperly adjusted manual bypass valves will result in damage to the heater if the flow rates are not maintained as specified in Figure 20 under all operating conditions. The heat ex- changer will fail and this damage will not be covered under the Hayward warranty. Figure 22 illustrates a typical pool piping diagram and layout for the pool equipment. Figure 23 illustrates a multiple heater installation for very large pools with and without a manual bypass valve. Figure 21: Manual Bypass valve USE ONLY HAYWARD GENUINE REPLACEMENT PARTS Pomona, CA Clemmons, NC Nashville, TN Tel: 908-351-5400 www.haywardpool.com

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Pomona, CA Clemmons, NC Nashville, TN
Tel: 908-351-5400
www.haywardpool.com
USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
26
If the normal pump and filter system flow rate exceeds
125 gpm then a manual bypass valve must be installed as
shown in Figure 21. Damage caused by flow rates outside
this range will void the manufacturer’s warranty.
The installation is as follows:
1. Install a flow meter on the outlet line of the heater.
2. Adjust the manual bypass valve until the flow
rate is within the flow rate range specified for the
heater.
3. Once the valve is set, note the position and remove
the valve handle to prevent further adjustment.
ATTENTION:
Improperly adjusted manual bypass valves will result in damage to the heater if the
flow rates are not maintained as specified in Figure 20 under all operating conditions. The heat ex-
changer will fail and this damage will not be covered under the Hayward warranty.
Figure 22 illustrates a typical pool piping diagram and layout for the pool equipment.
Figure 23 illustrates a multiple heater installation for very large pools with and without a manual
bypass valve.
Figure 20
Allowable Water Flow Rate Range
Model
Minimum Flow
Rate (GPM)
Maximum Flow
Rate (GPM)
H150FD
H200FD
20
125
H250FD
H300FD
25
125
H350FD
H400FD
30
125
Figure 21: Manual Bypass valve