I've recently replaced my Hayward H400FD gas heater with a newer model (old one about 15 years old). Everything seems to be working, but often won't start. Input pressure is 6.6 to 6.9, well within the 4.5 to 10.0 recommended pressure. Manifold pressure is 1.32, well below the 1.8 to 2.0 recommended pressure. I'm fairly certain this is causing the starting problems, and would be an issue either way.
My problem is that I can turn it down at the far height of the screw distance to about 1.10 when the heater turns off. No matter how far down I turn the screw clockwise, it will quickly hit 1.29-1.34 and just bounce around that range. Fairly certain the new unit has a defective Honeywell valve, but thought I'd check here to see if anybody has advice.
The only thing "unique" about the install is that i did have to turn the 90 degree elbow at the top of the valve to match the right side input of the older installation. Since the input pressure is perfect I doubt this is causing issues though.
Probably not useful, but when the heater does start, the input pressure tap does go from 6.6 to 2.4. This value is not variable either as I turn the Regulator Adjustment screw. I'm assuming this is standard as the manifold kicks in, but could be a sign of something?
My problem is that I can turn it down at the far height of the screw distance to about 1.10 when the heater turns off. No matter how far down I turn the screw clockwise, it will quickly hit 1.29-1.34 and just bounce around that range. Fairly certain the new unit has a defective Honeywell valve, but thought I'd check here to see if anybody has advice.
The only thing "unique" about the install is that i did have to turn the 90 degree elbow at the top of the valve to match the right side input of the older installation. Since the input pressure is perfect I doubt this is causing issues though.
Probably not useful, but when the heater does start, the input pressure tap does go from 6.6 to 2.4. This value is not variable either as I turn the Regulator Adjustment screw. I'm assuming this is standard as the manifold kicks in, but could be a sign of something?