Internal bypass kit probably isn’t necessary. It was a last ditch effort thinking the flow was somehow disrupting the UG.
Harmonic noise from newly installed RayPak 366A NG
- Thread starter Crani07
- Start date
High inlet gas pressure could be the cause of the problem.
Maybe due to a defective gas pressure regulator.
Most likely, you did not need to adjust the gas valve.
Maybe due to a defective gas pressure regulator.
Most likely, you did not need to adjust the gas valve.
The gas valve regulator is pre set differently for ng and lg. The orifice in pilot and gas jets on manifold are different sizes.
Just checked my pressures with an inexpensive digital manometer. Inlet pressure without demand is 10 drops to 7.5 with heater on. Internal gas regulator demand is at 2.4 ( no harmonics) as soon as I start increasing pressure at about 2.5 the harmonics start. The more I increase up to 4.0 it’s full volume harmonics. Not sure how accurate the Raypak digital board is. So at 2.4 says good flames no error codes. At 4.0 says good flames again nothing showing in fault menu. Any other data I need to get?
A minimum of 6 in. WC and a maximum of 10.5 in. WC upstream pressure under load and no-load conditions must be provided for natural gas.
A minimum of 12 in. WC and a maximum of 13 in. WC are required for propane gas under load and no-load conditions.
Gas Pressure Regulator
The gas pressure regulator is preset at 4.0 in. WC for natural gas, and 10.5 in. WC. for propane gas.
The pressure at the gas valve, taken with a manometer, should be about 4.0 in. WC natural gas and 10.5 in. WC propane gas.
If an adjustment is needed, remove seal and turn adjustment screw clockwise to increase pressure or counter-clockwise to decrease pressure.
https://s3.amazonaws.com/AWSProd/sites/raypakcom/documents/241236.pdf
A minimum of 12 in. WC and a maximum of 13 in. WC are required for propane gas under load and no-load conditions.
Gas Pressure Regulator
The gas pressure regulator is preset at 4.0 in. WC for natural gas, and 10.5 in. WC. for propane gas.
The pressure at the gas valve, taken with a manometer, should be about 4.0 in. WC natural gas and 10.5 in. WC propane gas.
If an adjustment is needed, remove seal and turn adjustment screw clockwise to increase pressure or counter-clockwise to decrease pressure.
https://s3.amazonaws.com/AWSProd/sites/raypakcom/documents/241236.pdf
Are you sure that you are using the gas pressure manometer correctly with it set to inches of water column?
What is the model number?
Can you verify that it is natural gas and not propane?
Maybe a video with sound would be helpful.
Can you verify that it is natural gas and not propane?
Maybe a video with sound would be helpful.
Maybe make a vide and email it to Raypak.
Maybe ask them to send you the 105F UG Service Kit 018758F or the Coil Service Kit 019204F (Model 336-337).
Maybe ask them to send you the 105F UG Service Kit 018758F or the Coil Service Kit 019204F (Model 336-337).