Start-Up - Raypak Xfiire 300B Installation And Operation Manual

3. Attach (1) 24" scale manometer to the manifold
pressure tap located near the shutoff valve
downstream of the firing valve (Measure point "C" in
Figure 59).
4. Attach (1) 12" scale manometer on the fan suction
pressure hose. Pull black cap from the air pressure
tee as shown in Figure 60 and connect the
manometer.
NOTE: Retain caps for reinstallation later.
Check Gas Supply Pressure
1. Slowly turn on main gas shut-off valve.
A
C
A
B
Figure 59. Gas Pressure Measurement Locations
2. Read the gas supply pressure from the manometer;
minimum supply pressure for natural gas is 4" WC,
recommended supply is 7" WC, minimum supply
pressure for propane gas is 4" WC, recommended
supply is 11" WC (dynamic readings, full fire input).
3. If the gas pressure is greater than 14" WC, turn off
the main gas shut-off valve, upstream of the heater.
56
B
MODELS 300B - 500B
F10619
C
MODELS 650B - 1000B

Start-Up

NOTE: The values in Table AA and Table AB represent
the conditions when the heater is at full firing rate at sea
level.
NOTE: Pressure and combustion data are provided with
the heater.
1. Turn power on.
2. Turn on the heater,
rocker switch to top position to enable CFH wait
approximately 15 seconds after the blower starts, the
igniter should start to glow (observable through the
observation port located on top of the combustion
chamber). Gas valve should open in 45-60 seconds.
3. The heater ignites at 30% to 40% of full rate
(as indicated on the touch screen display of the
temperature controller located behind the front
panel).
4. If the burner fails to light on the first 4-second trial for
ignition, it will try for ignition up to three times before
going into lockout with the standard ignition module.
If the heater is equipped with the optional single-try
ignition module, it will go into lockout.
5. Wait until the controller indicates 100% on the firing
rate display screen (approximately 30 seconds).
AIR PRESSURE TEE
MODELS 650B - 1000B
Figure 60. Air Pressure Tee
switch Enable/Disable
MODELS 300B - 500B
AIR PRESSURE
TEE
F10659