Start-Up - Raypak 503A Installation & Operating Instructions Manual

Preparation
WARNING: Do not turn on gas at this time.
Check Power Supply
With multi-meter at incoming power, check voltage
between:
Hot - Common (≈120 VAC)
Hot - Ground (≈120 VAC)
Common - Ground (< 1 VAC)
Attach Manometers to Measure Pressures
1. Turn off main gas valve.
2. Attach (1) 12" scale manometer to an upstream
bleedle valve on the gas supply pipe to the heater
(Measure point "A" in Fig. 44).
3. Attach (1) 24" scale manometer to the manifold
pressure tap located on the shutoff valve down-
stream of the firing valve (Measure point "D" in
Fig. 44).
4. Attach (1) 12" scale manometer near the fan-prov-
ing switch. Pull black cap from air pressure tee as
shown in Fig. 45 and connect the manometer.
NOTE: Retain caps for reinstallation later.
GAS
B
A
Fig. 44: Gas Pressure Measurement Locations
Check Gas Supply Pressure
1. Slowly turn on main gas shut-off valve.
2. Read the gas supply pressure from the manome-
ter; minimum supply pressure for natural gas is 4.0
in. WC, recommended supply is 7.0 in. WC, mini-
mum supply pressure for propane gas is 4.0 in.
WC, recommended supply is 11.0 in. WC (dynam-
ic readings, full fire input).
TO BURNER
C
3. If the gas pressure is greater than 14.0 in. WC,
turn off the main gas shut-off valve, upstream of
the heater.

Start-Up

NOTE: The values in Tables S and T 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, wait approximately 15 seconds
after the blower starts, the igniter should start to
glow (observable through the observation port
located at the front, below the gas valve). Look
into the sight glass located just below the gas
valve near the front of the unit to check igniter
operation. Gas valve should open in 45-60 sec-
onds.
3. The heater ignites at 30% to 50% of full rate (as
indicated on the LCD display of the temperature
controller located behind the front panel).
4. If the burner fails to light on the first trial, it will try
for ignition up to three times before going into lock-
out 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 fir-
ing rate display screen (approximately 30
seconds).
D
45
Fig. 45: Air Pressure Tee
MANIFOLD TAP
AIR PRESSURE
TEE