Installation guide
Table 7--Air Delivery(Cfm) atlndicatedTemperatureRise and Rated Heating Input
HEATING TEMPERATURE RISE _F
INPUT
(BTUH) 20 25 30 35 40 45 50 55 60 55 70
40,000 1500 1200 1000 857 750 867 600 545 500 -- --
60,000 2250 1800 1500 1286 1125 1000 900 818 750 892 --
80,000 -- -- 2250 1929 1688 1500 1350 1227 1125 1038 964
115,000 -- -- -- 2464 2156 1917 1725 1588 1438 1327 1232
130,000 -- -- -- 2788 2438 2167 1050 1773 1825 1500 --
NOTE: Dashed areas de net {all within the 8pproved temperature rise range of the uNt.
]. R_movc cover sarew over regulator adjusttrz3nt screw on gas vslvc,
2. Turn regulator adjustment sarerv clockwise to increase gas input, or turn regulator adjustment sarew counterelocknvlse to dearease input,
Manifold pressure must bc betwcan 3,4 and 3,6 in, wg, Uusafc operation of the trait may result if manifold pressure is outside this range,
Personal injury or unit damage may result,
z_ WARNING: Unsafe operation of the unit may result if manifold pressure is outside this range, Serious injury, death
or unit damage may result.
3. Replace cover screw cap on gas valve.
4. Turn off"gas supply to unit. Remove manometer from pressure tap and replace pipe plug on gas valve, Turn on gas to tmlt sad check for
leaks.
MEASURE MANIFOLD PRESSURE (PROPANE UNITS)
The main burner ofificas on a propszae gas trait are sized for the trait rated input whea the m,q_ifbld Wessure reading matehas the level _ecified
in Table 6,
Precced as follows to adjust gas input on a propsaae gas trait:
1. Turn off gas to malt.
2. Remove plpe plug on manifold, and connee't manometer (See Fig, 13).
3. Turn on gas to mat.
4. Remove cover screw over regttlator adjustment screw on gas valve,
5. Adjust regulator adjustmeat screw to the correct manifold pressure, as _ccified in Table 6, Turn adjusting screw alockwise to increase
manifold pressure, or aun adjusting screw counterelock3vlse to decrease manifold, pressure,
6. Replace cover screw.
7. Turn off gas to mat. Remove manometer from pressure tap. Replace pipe plug on gas valve, then turn on gas to mat, Check for leaks.
D. CHECK BURNER FLAME
With burner anecss ps:nal removed, ob_rve the mat heating operation. Watch the bm'ner flamas to see if they sac light blue sad soft in appearance,
sad that the flamas arc approximately the same f_ canh burner, Preps:he will have blue flame with yellow tips (Sec Fig, 14), Refer to the
Maintenance see'danfor information on 1miner removal,
E, AIRFLOW AND TEMPERATURE RISE
The heating see'dan for each size mat is designed and aPtTmvcd for heating opemtlon within the temparature-rlse range stsrnpcd on the mat radng
plate,
Table 7 shows the approved temperature rise range for each heating input, and the _ dellverg cfm at various temperature rises, The heating
opemfian _flow must preduee a temparature rise that fhlls within the approved range.
Refbr to Indoor Airflow and Airflow A4iustments see'dan to adjust heating airflow whea reqtul'ed.
F, HEATING SEQUENCE OF OPERATION
(Sec Fig. 15-17 s:nd tm_t ,_g label),
On a call for heuting, tt,_'minal "W" of the thermostat is energized, starting the indueed-draft motor, When the h011.-offect sensor on the
induced-draft motor _nsas that it has reached the reqtfired _ecd, the burner sequence begins, This rime'don is performed by the integrated gas
control (IGC). The evaporator-fan motor is cnargJzed 45 scc, after flame is established. When the thermostat is satisfied s:nd "W" is deanergJzed,
the burnars stop firing and the evaporator-fan motor shuts off after a 45-see. tlmc-off delay.
An LED (light-emi_g diode) indicator is provided on the control bom'd,to monitor operation. The control board is locuted by removing the burner
aecass panel. Dung normal operation, the LED is contlnueusly on (See Table 8 for error codes).
G, LIMIT SWITCHES
Normally closed, limit sv¢iteh (LS) completes the control clrcult through the thermostat R clrcult. Should the leaving-sir temparature rise above
the maximum allowable temparature, the lhnit switeh opens s:nd the R control clrmtit "breaks." Any interruption in the R control elrertit instantly
closes the gas valve s:nd stops gas flow to the burners s:nd pilot. The blower motor continues to nm tmtll LS resets,
When the _ tompem_ at the limit swlteh drops to the low- tomperature setting of the limit sv¢iteh, the switeh closes s:nd completes the R cantml
cirealt. The electric-spark ignltion _stom cyclas and the tmlt retm'ns to normal heutSng operation.