Carrier 48KLA Installation, Start-Up And Service Instructions Manual page 12

2. Open air shutter very slowly until yellow tip just
disappears, then secure air shutter in place with
locking screw.
3. Repeat steps 1 and 2 for each burner.
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 Fig. 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 time, 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.
Table 5 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 Adjustments — Indoor Airflow and Airflow
Adjustments to adjust heating airflow when
required.
HEATING SEQUENCE OF OPERATION —
See Fig. 10.
Models 48KHA,KLA have an intermittent
electric-spark ignition system without a standing
flame. When manual shutoff is opened, gas flows to
gas valve. On a call for heating by the thermostat,
unit terminal R makes to unit terminal W. Pilot
valve solenoid of gas valve and spark generator are
energized. Gas flows to pilot and the pilot is ignited
within 4 seconds. The flame sensor proves the
presence of pilot flame within 0.8 seconds after pilot
ignition. The internal switching of gas valve de¬
energizes spark generator, energizes main valve
solenoid and energizes heating delay relay. Gas
flows to main burners and is ignited by pilot flame.
Contacts of heating relay close between 60 and 90
seconds after burners are ignited, and blower motor
starts. Heating cycle is now in normal operation.
Unit will continue operating in heating cycle until
->
Table 5 — Air Delivery (cfm) at Indicated Temperature
Rise and Rated Heating Input
MODEL 48-
HEATING
INPUT
(Btuh)
TEMPERATURE RISE (F)
37
1
39 FI
43 45
47 49
51 53
j
55 57 59
m
iy<H
m
ca
69 :
_
I
71 ^ 73 |
nr-
KLA118
40,000 751
nn B23 B9|
617 591 567 B2U 524 505 487
KSI mm n
-
^ i
KLA124 40,000
794 751 712 678 646 617 591 567
m
- -
-
EM
MM Si' -
- '/'
:
• ::
75,000
- - - —
1212 1158 1109 | 1022 983 947 914
|§|
■=wl
778
- -
■ -1
"
J
KLA130 40,000
mu
617 591 MU
524 505 487 BBI K
Bi
-
-
-
s
KHA030 75,000 B
m IJ^Ql Big 1158
1109 1063
1022 983 947 914 grni
-
Bi Bi -
—
i
B
-
KLA036/136
60,000
DEI BE3 EH EE1
S3
mm mi
mrM
- Bi BR - .
_
-
KHA036/1 36 100,000
1EEE1
BUI
m
mm
B33
S
1263 1102
IB
MU Hgj| ■jgj ma mig
KHA036BF/CF 125,000
kb
SB |
1638
|
1579
MU
1378 1336 1296 1258 1223
KLA042/142
:
60,000
wm %%%£&
926 887
■an WBEU
758 661 641 622 604 587
■sa mil
125,000
mu iisii sggjjl
iiiii
1930 1846
um
iltti KS3 |
1482 j
fgg|
1378 1326
IB
Ujjgj
§3B2
KLA048/148
j
80,000
mm
IMcKD
■inti
naiii
■jrn im
_ —
Bi
Mj'
Mmum Wmmmm
■Hi ■HI
i.
125,000
gjjgggg
1930
llis
mu
1702 ; 1638 i
. _
I
1579 Bi
im Qg] mu
ibh l&sQI
B
100,000
lUlI nH itii 1543 1478 | S 1417
1362
131 Oj 1263
mil KBB urn
EM
HU
-
EM
1 50,000
■
MM nn 2325
ggjj
2051 1974 !
_
1
|yvy|
1835 ] m
HUS
m
IB IB
UB
IB IDS I 1395
NOTE: Shaded areas of the table fall below the approved temperature rise range of the unit Dashed areas
of the table fa II beyond the air delivery capability of the unit within the operating voltage range for all voltage
options for each size unit
12