User`s manual

BURNER FLAME
_Z NIFOLD
C99021
Fig. 14--Monoport Burner
4. Recover refi'igerant from ret'rigerant system and evacuate to
500 microns if additional leaks are not found
5. (barge unit with R-22 ret'rigerant, using a volumetric°
charging cylinder or accurate scale R@_' to _lnit _'atmg plate
fin" _'eq_li_'ed cha_'.ge_ Be sure to add extra ref?igerant to
compensate for internal volume of filter &ier.
Step 2--START-UP HEATING AND MAKE ADJUST-
MENTS
section bel\_re starting the unit
Do not jumper any safety devices when operating the unit
Make sure that burner orifices are properly aligned. Unstable
operation may occur when the burner orifices in the manifold are
misaligned
Follow the lighting instructions on the heating section operation
label (located inside the burner or blower access door) to start the
heating section.
NOTE: Make sure that gas supply has been purged, and that all
gas piping has been checked fbr leaks.
(HECK HEATING CONTROL
Start and check the unit fbr proper heating control operation as
fbllows (see fl/rnace lighting instructions located inside burner or
blower access panel):
1. Place room thermostat SYSTEM switch in the HEAT position
and d'*e fan switch is placed in AUTO position.
2. Set the heating temperature control of the thermostat above
ro on'l temperature
3. The induced-&aft motor will start.
4. After a call for heating, the main burner should light within 5
sec. If the burners do not tighk there is a 22-sec. delay bel\_re
another 5-sec. try. If the burners still do not light, this
sequence is repeated. If fl_e burners do not light within 15
minutes from the initial call for heat, there is a lockout. To
reset the control, break the 24-v power to W.
5. The evaporator fan will mrn on 45 sec. after fl_e flame has
been established. The evaporator fan will mm off45 sec. after
the thermostat has been satisfied.
(HECK GAS INPUT
Check gas input and manifbld pressure aker unit start=up (See
Table 6). If adjustment is required proceed as fbllows:
16
* The rated gas inputs shown in Table 6 are %r altitudes fiom sea
1eve1 to 2000 ft above sea tevel. These inputs are based on
natural gas with a heating value of 1050 Bmift 3 at 0.65 specific
gravity, or propane gas with a heating value of 2500 Bmifl 3 at
15 specific gravity.
* For elevations above 2000 if, reduce input 4 percent fbr each
1000 ft above sea level.
* When the gas supply being used has a different heating value or
specific gravity, refer to national and local codes, or contact
your distributor to determine the required orifice size.
These units are designed to consume the rated gas inputs
using fl-_e fixed orifices at specified manifold pressures as
shown in Table 6 DO NOT REDRILL THE ORIFICES
UNDER ANY CIRCUMSTAN(ES.
ADJUST GAS INPUT
The gas input to the unit is detem_ined by measuring the gas flow
at fl_e meter or by measuring the manifbld pressure Measuring the
gas flow at the meter is recommended for natural gas units. The
manifold pressure must he measured to determine the input of
propane gas units
Measure Gas Flow (Natural Gas Units)
Minor adjusm_ent to the gas flow can be made by changing the
mani_bld pressure. The manifold pressure must be maintained
between 3.4 and 3.6 in. wg.
If target adjustments are required,
change main burner orifices following
the recommendations of national
and local codes
NOTI=: All other appliances that use the same meter must be
turned off when gas flow is measured at the meter
Proceed as follows:
1. Turn off gas supply to unit.
2. Remove pipe plug on manifold (See Fig. 13) and connect
manometer. Turn on gas supply to unit.
3. Record number of seconds for gas meter test dial to make one
revolution
4. Divide number of seconds in Step 3 into 3600 (number of
seconds in one hour).
5. Muhiply result of Step 4 by the numbe* ofcu fl shown _br one
revolution of test dial to obtain cuff of gas flow pc* hour
6. Muhiply result of Step 5 by Bm heating value of gas to obtain
total measured input in Btuh. Compare this value with heating
input shown in Table 6 (Consult the local gas supplie* if the
heating value of gas is not known)
EXAMPLE: Assume d'mt the size of test dial is 1 cuft, one
revolution takes 32 sec, and the heating value of the gas is 1050
Btuift 3. Proceed as follows:
1. 32 sec. to complete one revolution.
2. 3600+32 112.5
3. 1125 x 1 1125 t't-_of gas flowihr
4. 1125 x 1050 118,125 Btuh input
If the desired gas input is i 15,000 Bmh, only a minor change in the
manifold pressure is required
Observe manifold pressure and proceed as follows to adjust gas
input:
1. Remove cover screw over regulator adjustment screw on gas
valve.