Carrier 48KH - Manual (Page 12)

After air shutter adjustments have been com­
pleted, observe that flames on each burner are light
blue and soft in appearance, and that flames are
same height along entire length of each burner. See
Fig. 9.
BLOWER HEAT-RELAY OPERATION — Heat­
ing relay (see Eig. 6 and unit wiring diagram) is
located in the control box and adjusts to permit
either longer or shorter OFF cycles. The ON cycle
automatically adjusts as OFF cycle changes. Adjust­
ing lever on relay is factory-set at center position to
provide optimum performance for most installa­
tions. On unusual installations, or where line voltage
is considerably above or below rated voltage, an
increase or decrease may be required for length of
time blower remains on. To increase blower opera­
tion tirpe, move adjusting lever toward right-hand
position. To decrease blower operation time, move
lever toward left-hand position.
AIRFLOW AND TEMPERATURE RISE — The
heating section of each size of unit is designed and
approved for heating operation within temperature
rise range stamped on unit rating plate.
Tables shows approved temperature rise range
for each unit and air delivery (cfm) at various tem­
perature rises. Heating operation airflow must pro­
duce a temperature rise that falls within the approved
range. Refer to Cooling Section Start-up and Adjust­
ments — Indoor Airflow and Airflow Adjustments
to adjust heating airflow when required.
HEATING SEQUENCE OF OPERATION — The
following sequence of operation pertains to all 208/
230-volt, 3-phase units; however, the sequence of
operation of single-phase and 460-volt units is very
similar. Refer to the wiring diagram in Fig. 10.
NOTE: Although actual unit wiring may vary slightly
from that shown in Fig. 10, sequence of operation
will not be affected.
With room thermostat selector switch at HEAT
position and FAN switch at AUTO, position, heat­
ing sequence of operation is as follows:
Models 48KH,KL have an intermittent electric-
spark ignition system without a standing flame.
When manual control valve is opened, gas flows to
solenoid valve chamber of gas valve. U nit is no w in a
standby condition and ready for a call for heat from
room thermostat.
When room temperature drops to a point slightly
below heating control setting of room thermostat,
the thermostat heating bulb tilts and completes cir­
cuit between thermostat terminals R and W. This
completed circuit between R and W thru the room
Table 5 — Air Delivery (cfm) at Indicated Temperature
Rise and Rated Heating Input
MODEL 48—
Heating
Input (Btuh) 35 37 39 41 43 45 “ 47 49
Te
51
mperat
53
ure Ris
55
e(«F)‘
57 59 61 63 " 65 67 69 71 73
KL018 40,000 794 751 712 678 646 617 591 567 545 524 505 487 471 455 441 427 - - - -
KL024 40,000 794 751 712 678 646 617 591 567
KH024 60,000 1190 1126 TÒ68“ 1(Л6Г9В9 926 887 850 817 786 758 731 706 - - - - - -
KLO30 40,000 617 591 567 545 524 505 487 471 455 — — — — — —
KHO30 60,000 1190 1126 1 063 1016 969 926 887 850 817 786 758 -
KL036 60,000 1190 1126 1068 1016 '969 926 887 850 817 786 758 731 706 683 - - - - - -
KH036 100,000 1984 1877 М78М 1694 1615 T 543 1478 1417 1362 1310 1263 1218 1177 1 ì 38 1102 1068 1036 1006 978 951
KH036BF/CF 125,000 - .icoc. аз» 2006 1921 1842 1770 1703 1641 1584 1530 1480 1433 1389 1347 1308 1272 1237
KL042 60,000 926 887 850 817^ 786 758 731 706 683 661 64Ì 622 604 587 571
KH042 80,000 ~ 1235 11 82~ 1134 МТ89 1048 1ТМТ “975 942 *9 il - - - -
KL048 80,000 1235 1182 1134 1089 1048 1010 975 942 911 - - - - -
KH048 100,000 1543 1478 1417 1362 1310 1263 1218 1177 1138 1102 - - - -
KH048BF/CF 125,000 2006 1921 1842 1770 1703 1641 1584 1530 1480 1433 1389 1347 1308 1272 1237
KL060 100,000 1543 1478 1417 1362 1310 1263 1218 1177 1138 1102 - - — - -
KHO60 120,000 1852 1773 1701 1634 1572 1515 1462 1412 1366 1323 1282 1244 1208 1174 1142
KH060BF 150,000" jr r JS'3 2407 ^5 2211 2124 2044 1970 1901 1836 1776 1720 1667 1617 1570 1526 1484
--- -------- - ...... .. _ ». L - _ „ » - - 1 1
NOTE; Shaded areas of the table fall below the approved temperature rise range of the unit Dashed areas
of the table fall beyond the air delivery capability of the unit within the operating voltage range for all voltage
options for each size unit
‘Single-phase units Temperature rise for 3-phase units may be different due to blower motor performance
For 3-phase units use;
Temperature Rise =-
Capacity
926
1204
556
1204
n i l
1444'
12