Start-Up - Raypak XTherm 1005A 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 55).
4. Attach (1) 12" scale manometer on the fan suction
pressure hose. Pull black cap from the air pressure
tee as shown in Figure 55 and connect the
manometer.
NOTE: Retain caps for reinstallation later.
6.4.3. Check Gas Supply Pressure
1. Slowly turn on main gas shut-off valve.
GAS
B
A
Figure 55. 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.

6.5. Start-Up

NOTE: The values in Table X and Table Y 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
TO BURNER
C
D
switch Enable/Disable
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).
6.5.1. Blower Check
1. Check blower suction using the manometer attached
to the air pressure tee, with the heater firing at 100%
input. The reading should be as noted in Table Y for
both natural and propane gas.
NOTE: Retain the black plastic ca removed to install the
manometer. It needs to be replaced when the manometer
is removed.
2. When firing at 100%, the desired heater combustion
CO2 is 9.0% ± 0.4% for natural gas and 10.3% ±
0.4% for propane with CO less than 100 ppm. If this
combustion cannot be achieved with the blower
suction within the tolerances specified in Table X,
contact the factory.
3. For Models H and WH only: CO2 and CO levels
must be checked at minimum fire. When firing at
minimum fire, the desired combustion CO2 is 9.0%
for natural gas and 10.3% for propane gas with CO
less than 100 pm. If CO2 is not between 7.5% and
9.5% for natural gas, or between 8.0% and 10.5% for
propane gas; and if CO is above 100 ppm in either
case, stop running the unit and contact your Raypak
representative. Visit www.raypak.com for contact
information.
WARNING:
A Improper
alteration, service or maintenance can cause property
damage, personal injury, exposure to hazardous materials
or loss of life.
6.5.2. Manifold Check
1. Check manifold gas pressure at the gas valve outlet
pressure tap (connection "C" in Figure 55). This
pressure should read per the values in Table Y for
natural and propane gas.
2. If the pressure reading differs by more than ± 0.2 in.
WC, STOP – verify against the "final test settings"
decal provided on the inside top front panel – Call
the factory for directions on what to do next!
Net Blower Suction
Model
(in. WC)
No.
Natural Gas
1005A -4.1
1505A -4.1
2005A -4.1
Table X. XTherm Air Pressure Settings
installation, adjustment,
Setting
Tolerance
Propane
-4.3 ± 0.2" WC
-4.3 ± 0.2" WC
-4.3 ± 0.2" WC
49