Section Iv Technician Service; General; Maintenance; Control Access - Hayward H250FDN Service & Installation Manual

SECTION IV. QUALIFIED TECHNICIAN – MAINTENANCE & SERVICING

GENERAL:

ATTENTION: Only qualified service technicians, with appropriate test equipment, should be allowed
to service the heater. Bear in mind that all of the components that comprise the system have an effect
on heater operation. Before proceeding with heater related troubleshooting tips covered in Section VII,
be certain that the pump is operating correctly, the filters and strainers are not blocked, the valves in the
piping are properly positioned, and the time clocks are properly set.

MAINTENANCE:

The following inspection procedures are recommended to be performed as part of annual heater mainte-
nance and to ensure safe operation.
1. External heat exchanger
. Internal heat exchanger
3. Main burner flame patterns
4. Main burner orifices
5. Operating controls
Inspection procedures are covered below. Some of the procedures will require disconnecting and remov-
ing wires in the control compartment. See "Control access".

CONTROL ACCESS:

To access the operating controls as shown in Figure 7:
1. Remove the () screws from the
front access panel.
. Remove the () screws from the
control panel cover.
. Label all wires prior to disconnec-
tion when servicing controls.
. If there are questions when recon-
necting the wires, refer to the
wiring diagram in Figure 8.
5. Verify proper operation after ser-
vicing.
. After service is complete, as-
sembly is the reverse of Steps 1-
above.
WARNING: EXPLOSION HAZARD Do not attempt to repair any components of
this heater. Do not modify the heater in any manner. To do so may result in a mal-
function that could result in death, personal injury, or property damage. Check with
the consumer to see if any part of the heater has been under water. Replace any part
of the control system and any gas control that has been under water.
Figure 37: Panel removal for various maintenance procedures
(Note: not all panels need be removed for every procedure, follow
the written instructions in Section VI.)
Rain shield
assembly
Flue collector
panel ()
Blank side
trim panel
End cap
Front access
panel
USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
Top panel
Control box
Control box cover
Pomona, CA Clemmons, NC Nashville, TN
Tel: 908-351-5400 www.haywardpool.com
7
Flue cover
Heat exchanger
Water header
Header side
trim panel
End cap
Side jacket