Sterling RT - Manual (Page 17)

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LIGHTING
Purge the gas line of air before attempting to light the
pilot in the unit. Wait 5 minutes for unburned gas to
vent. Check for gas leaks.
Never use an open flame to
detect gas leaks. Explosive conditions may
exist which could result in personal injury or
death.
The unit is furnished with an intermittent pilot ignition
system. A lighting instruction plate is permanently
attached to the unit for the pilot system supplied with
the unit. To set the intermittent pilot ignition system
in operation, proceed as follows:
1. Turn on the main manual valve and pilot valve.
2. Turn on electrical power. The unit should now be
under the control of the thermostat.
3. Turn the thermostat to the high heat reading to see
if the pilot and main burner ignite.
4. Tur n the ther mostat to the lowest setting to
interrupt power to the ignition system to determine
that both the pilot burner and main burner are
extinguished.
5. Set the thermostat at the desired setting for normal
operation.
For complete shutdown:
1. Tur n the main and pilot valves to the OFF
position.
2. Shut off electric power.
3. Adjust the thermostat to the lowest setting.
*
INPUT
IN
1000
BTU
2500 BTU/Ft 3
(93.1 MJ/m 3 )
PROPANE TYPE OF GAS NATURAL
HEATING VALUE 1075 BTU/Ft 3
(40.1 MJ/m 3 )
3.5 inch WC
(0.87kPA)
10 inch WC
(2.49 kPA)
NUMBER
OF
BURNER
ORIFICES
MANIFOLD
PRESSURE
40
54
50
54
60
54
70
54
80
54
90
54
100
54
120
54
120
54
140
54
140
54
160
54
PV/RT
100
PV/RT
125
PV/RT
150
PV/RT
175
PV/RT
200
PV/RT
225
PV/RT
250
PV
300
RT
300
PV
350
RT
350
PV/RT
400
4
5
6
7
8
9
10
12
12
14
14
16
FT 3 /HR
ORIFICE DRILL
FT 3 /HR
ORIFICE DRILL
FT 3 /HR
ORIFICE DRILL
FT 3 /HR
ORIFICE DRILL
FT 3 /HR
ORIFICE DRILL
FT 3 /HR
ORIFICE DRILL
FT 3 /HR
ORIFICE DRILL
FT 3 /HR
ORIFICE DRILL
FT 3 /HR
ORIFICE DRILL
FT 3 /HR
ORIFICE DRILL
FT 3 /HR
ORIFICE DRILL
FT 3 /HR
ORIFICE DRILL
Figure 12 - Main Burner Flames
NOTICE: There may be momentary and spasmodic
orange flashes in the flame. This is caused by the
burning of airborne dust particles, and not to be
confused with the yellow tipping, which is a stable
or permanent situation when there is insufficient
primary air.
D3652
NORMAL
(HARD FLAME)
YELLOW TIPPING
(MARGINAL)
YELLOW FLAME
(TOO LITTLE AIR)
LIFTING
(TOO MUCH AIR)
2500 BTU/Ft 3
(93.1 MJ/m 3 )
PROPANE NATURAL
1075 BTU/Ft 3
(40.1 MJ/m 3 )
3.5 inch WC
(0.87kPA)
10 inch WC
(2.49 kPA)
HIGH TEMP. RISE
FURNACE (30°-90°F)
STD. TEMP. RISE
FURNACE (20°-60°F)
Chart 5 - Main Burner Orifi ce Schedule*
* This schedule is for units operating within the U.S.A.
at normal altitudes of 2000 ft. (610m) or less. For
altitudes above 2,000 ft., refer to local codes, or in
absence of local codes, refer to the latest edition of
the National Fuel Gas Code ANSI Standard Z223.1
(NFPA no. 54).
When installed in Canada, any references to deration
at altitudes in excess of 2000 feet (610m) are to be
ignored. At altitudes of 2000 to 4500 feet (610 to
1372m), the unit heaters must be orifi ced to 90% of the
normal altitude rating, and be so marked in accordance
with the ETL certifi cation.
NOT AVAILABLE