Installation guide

Table 6_Heating Inputs
GAS SUPPLY PRESSURE
HEATING
INPUT
{BTUH)*
NUMBER
OF
ORIFICES
40,000 2
60,000 2
90,000 3
115,000 3
130,000 3
Min
4,0
4,0
4,0
4,0
4,0
0N. WG)
Natural
Max
13.0
1&0
1&0
1&0
1&0
Pr_panof
M[n
4,0
4,0
4,0
4,0
4,0
Msx
13.0
13.0
13.0
13.0
13.0
MANIFOLD
PRESSURE
(IN. WG)
Natural Propanof
3.5 3,5
3.5 3,5
3.5 3,4
3.5 3,7
3.5 3,5
* When a unit is converted to propane, diff_rem size erifice_ must be used. See separate, _acural-te-propa_e _nver_ie_ kit inslructions.
B_e_ on altitutJes from sea level to 2000 ff above sea level. For alti|utJes above 2000 ft, reduce input rating € gercem for earA_ additional 7000 _l aPove sea level. In
_at_atJa, _rom 2000 _ above sea level te ,;500 ff above sea level, _erate file unit J0 percet_t.
2, Set the heating tompem_
control of the thermostat
above morn tompemtum,
3, The indueed-dr_,ff'c motor will s[urt.
4, Afier a call for healing, the moJn burner should light within 5 sen, If the burners do not light, them is a 22-scc, delay before another 5-sec,
W. If the burners still do not light, this sequence is repeated, If the burners, do not light within 15 minutes from the inltio] call for heat, them
is a lockout, To m_t the control, break the 24-v power to W.
5, The evaporator fan _vill _'n on 45 sac. afl_-rthe flame has been established. The evaporator fan will mm off 45 see. afl_-rthe thermostat
has been astlsfied,
B. CHECK GAS INPUT
Check gas input said tnanifbld pressure afier unit start-up (See Table 6). If adjustment is required proceed as fbllows:
• The rated gas inputs shown in Table 6 are for altitudes from sea level to 2000 fl above sea level, These inputs are based on natural gas with
a heating value of 1050 B_'fL s at 0.65 specific gravib,, or propane gas with a heating value of 2500 Bta/ff s at 1,5 _cclfic gravity.
• For elevations above 2000 fl, reduce input 4 pameat for each 1000 fL above sea level,
• When the gas supply being used has a dlffereat heating value or specific gravity, refer m national and local codes, or contact your distributor
to d_tenulne the reqtm_zd orifice size,
z_ CAUTION: These units are designed to consume the rated gas inputs using the fixed orifices at specified manifold
pressures as shown in Table 6, DO NOT REDRILL THE ORIFICES UNDER ANY CIRCUMSTANCES.
C. ADJUST GAS INPUT
The gas input to the unit is determined by measuring the gas flow ut the meter or by measuring the manifold pressure, Measuring the gas flow
at the meter is recommended for natural gas units, The manifold pressure must be measured to determine the input of propane gas units,
MEASURE GAS FLOW (NATURAL GAS UNITS}
Minor adjustment to the gas flow can be made by changing the mmfifold pressure. The manifold pressure must be maintained between 3,4 and
3,6 in, wg, If lurger adjustments oa'ere.tired, change main burner orifices fbllowlng the recommendations of national and local codes,
NOTE: All other applimlecs that use the same meter must be _m'ned off whoa gas flow is measured at the meter.
Proceed as follows:
1, Turn off gas supply to tmlt,
2, Remove pipe plug on manifold (See Fig, 13) and connect mmlomcter. 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 Sto_ 3 into 3600 (number of seconds in one hour).
5, Multiply result of Ste9 4 1_, the number ofcu fl shown for one revolution of test dial to obtain en fi of gas flow per hour,
6, Multiply result of Nto_ 5 by Btu heudng value of gas to obtain total measured input in Btuh. Compare thls value _%4thhealing input shown
in Table 6 (Consult the local gas suppller if the healing value of gas is not known),
EXAMPLE: Assume that the size of test dial is 1 cufL one revolution takas 32 see,, and the healing value of the gas is 1050 Bta/ft s, Proceed as
follows:
1, 32 sac, to complete one revolution,
2, 3600 + 32 = 112,5,
3, 112.5xl 112.Sf13ofgasflow/hr.
4, 112.5 x 1050 = 118,125 B_h input,
If the desired gas input is 115,000 Bmh, only a minor change in the mo:nlfold pressure is required,
Ob_rve manifold pressure said proceed as follows to adjust gas input:
_2_