Supply Wiring; Internal Wiring; Fuse Specifications - Hayward H250FDN Service & Installation Manual

SUPPLy WIRING:

If the heater is connected to the line side of the circuit it will be powered at all times. In this situation,
when the pump shuts down the heater will display a fault code of "LF". If there is a call for heat and the
pump then restarts there will be a 2-minute delay for the heater to fire. After the pump has been running for at
least  minutes there is no delay for heater operation.
Wiring the heater to the load side of the timer or controller will not result in a -minute delay if the pump
primes quickly enough to activate the heater's water pressure switch. If the pump is slow to prime the heater
may display an "LF" fault code and will take  minutes to automatically restart. If the pump has primed, this
wait can be avoided by manually clearing the error code via the keypad by changing the mode through the
"STANDBY" setting and returning to the initial setting ("SPA" or "POOL").
When a heater is wired to the line side of the power circuit (continuous power) the blower will not operate
when the pump is cycled via a time clock or other switch method.

INTERNAL WIRING:

If the heater display is blank after the electrical has been installed see Figures  and  to determine the
cause. The ribbon cable between the display board and the ignition control board is polarized and cannot be
inserted upside down if it was removed when electrical was done.

FUSE SPECIFICATIONS:

The fuse designations are printed on the
fuse board. See Figure 51 for their locations.
Fuses are available as common hardware items
or may be purchased from Hayward in a ser-
vice parts kit. The fuse specifications are:
• F1 fuse (low voltage): A bladestyle
fast-acting automotive fuse, type 57
• FC1 & FC2 (transformer primary):
3A slo-blo fuse, type C520 or 2AG
• FC3 (transformer secondary) fuse:
1.5A slo-blo, type C520 or 2AG
• FC4 (transformer secondary) fuse:
2.5A slo-blo, type C520 or 2AG
Figure 51: Ignition control board connection
Make remote connections to the terminal
block on the outside of the control box
Remote
connection
terminal
block
Bring field
wiring into
box here
Transformer
primary
fuses
Field
wiring
connection
USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
Pomona, CA Clemmons, NC Nashville, TN
Tel: 908-351-5400
& fuse locations
www.haywardpool.com
49
Low-voltage
fuse
Ground lug
Transformer
secondary
fuses