Check Safety Controls - Bryant 353BAV Installation, Start-Up & Operating Instructions

UNIT SIZE RETURN--- AIR SUPPLY
036060 SIDE/BOTTOM
036080 SIDE/BOTTOM
048080
SIDE/BOTTOM
060100 SIDE/BOTTOM
060120 SIDE/BOTTOM
NOTES:
* Airflow shown is with factory supplied 3/4---in. (19 mm) washable filter.*A filter is required for each return air opening.
*An airflow reduction of up to 7% may occur when using the factory---specified 4---5/16---in. (110 mm) wide, high efficiency media filter.
*For best furnace efficiency when using the 4 5/16---in. (110 mm) wide media filter, adjust blower speed tap to near the mid---point of the rise range.
*For horizontal and downflow applications, use one side or bottom or bottom only as an airflow reference.
(Read following caution before changing taps).
CAUTION
!
UNIT DAMAGE HAZARD
To avoid operating outside the rise range and avoid
component damage:
1. NEVER connect Speed Tap 1 (Red) wire to "HI HT."
2. NEVER connect Speed Tap 2 (Orange) wire to "HI HT"
on all models.
To change blower motor speed selections for heating mode,
remove blower motor lead from control HI-HT terminal. (See
Fig. 37.) Select desired blower motor speed lead from one of the
other motor leads and relocate it to HI-HT terminal. (See Table
18 for lead color identification.) Reconnect original lead on
SPARE terminal. Follow this same procedure for proper selection
of LO-HT and COOL speed selection.
Set Blower Off Delay
a. Remove Blower Access Door if installed.
b. Turn Dip switch 2 and 3 ON or OFF for desired
blower off delay. See Tables 13 and 14 or Fig. 36 and
37.
ADJUST BLOWER OFF DELAY (HEAT MODE)
If desired, the main blower off time delay period may be
lengthened or shortened when operating in the heating mode to
provide greater comfort. See Table 13 for position of switches
and Fig. 36 or 37. for location of switches on control center.
SET THERMOSTAT HEAT ANTICIPATOR
When using a nonelectronic thermostat, the thermostat
heat-anticipator must be set to match the amp draw of
the electrical components in R-W/W1 circuit. Accurate amp
Table 18 – Speed Selection
EXTERNAL STATIC PRESSURE (in. wc)
SPEED
0.1 0.2 0.3
5(Gry) 1430 1390 1345
3(Blu) 1240 1200 1145
4(Yel) 1090 1030 980
1(Red) 900 835 780
2(Org) 805 620 440
5(Gry) 1400 1360 1325
3(Blu) 1340 1300 1265
4(Yel) 1195 1160 1115
1(Red) 1025 980 935
2(Org) 855 800 745
5(Gry) 1720 1695 1690
3(Blu) 1565 1535 1530
4(Yel) 1330 1310 1270
2(Org) 1210 1180 1135
1(Red) 1110 1065 1005
5(Gry) 2070 2020 1985
3(Blu) 1815 1775 1730
4(Yel) 1580 1535 1480
2(Org) 1380 1325 1275
1(Red) 1170 1105 1055
5(Gry) 2250 2205 2155
3(Blu) 2130 2085 2030
4(Yel) 1890 1835 1790
1(Red) 1640 1585 1525
2(Org) 1420 1370 1305
draw readings can be obtained at thermostat subbase terminals
R and W.
Fig. 61 illustrates an easy method of obtaining actual amp draw.
The amp reading should be taken after blower motor has started
and furnace is operating in low heat. To operate furnace in
low-heat, first move SW-1 to ON position, then connect ammeter
wires as shown in Fig. 61. The thermostat anticipator should
NOT be in the circuit while measuring current. If thermostat has
no subbase, the thermostat must be disconnected from R and
W/W1 wires during current measurement Return SW-1 to final
desired location after completing the reading.
See thermostat manufacturer's instructions for adjusting heat
anticipator and for varying heating cycle length.
When using an electronic thermostat, set cycle rate for 3 cycles
per hour.
Step 6 - - Check Safety Controls
This section covers the safety controls that must be checked
before the installation is complete. The flame sensor, gas valve,
and pressure switch were all checked in the Start-up procedure
section as part of normal operation.
1. Check Primary Limit Control
This control shuts off gas control system and energizes
air-circulating blower motor if furnace overheats.
Recommended method of checking this limit control is to
gradually block off return air after furnace has been
operating for a period of at least 5 minutes. As soon as
limit control has shut off burners, return-air opening
should be unblocked to permit normal air circulation. By
using this method to check limit control, it can be
established that limit is functioning properly and operates
if there is a restricted return-air supply or motor failure. If
limit control does not function during this test, cause must
be determined and corrected.
60
0.4 0.5 0.6 0.7
1300 1250 1205 1150
1100 1040 975 915
935 850 800 730
705 635 565 490
380 300 --- ---
1285 1240 1205 1160
1215 1180 1135 1100
1065 1025 985 935
880 835 795 745
680 635 560 515
1655 1620 1580 1540
1490 1450 1420 1375
1220 1180 1135 1095
1085 1035 995 950
960 910 865 820
1925 1890 1850 1795
1690 1635 1595 1555
1440 1380 1380 1340
1220 1220 1165 1105
985 935 870 805
2110 2065 2020 1970
1980 1925 1880 1830
1740 1690 1640 1590
1475 1425 1365 1315
1255 1190 1135 1065
0.8 0.9 1
1080 995 845
860 790 730
665 590 525
410 335 200
--- --- ---
1125 1075 1000
1055 1015 965
895 850 800
685 635 585
460 420 360
1495 1465 1415
1335 1295 1255
1055 1010 970
910 865 810
770 720 670
1755 1690 1610
1500 1460 1410
1285 1235 1185
1060 1000 960
765 705 660
1925 1870 1790
1775 1730 1675
1535 1480 1435
1260 1200 1140
1010 940 880