Carrier 38BA - Manual (Page 10)

HEATING
Accessory steam or hot water coils are designed
for installation inside the unit casing. Prevent
freeze-up when introducing outside air.
AGA approved gas-fired heaters and UL ap­
proved electrical resistance heaters are recom­
mended for use in external system ductwork;
Table 1 — Heating Correction Factors
HOT WATER COIL
Water Temp Ent Water Entering Air Temp (F)
Drop (F) Temp (F) 40 50 60 70 80
10
Ì80 1 1 15 1.06 96 87 77
200 1,35 1.25 1.16 1.07 .97
180 98 88 79 ,70 60
20 200 1.18 1 09 1 00 90 81
220 1.37 1.28 1.20 1.1 1 1 01
180 79 70 61 52 42
30 200 1 00 91 85 73 .64
220 1 22 1 12 1 03 94 .85
STEAI^CO|L______ _ __
Entering Air Temp (F)
Steam Pressure (psig)
o”
2
5
NOTE: Multiply capacity given in Table 3 by the correction factor
for conditions at which unit is actually operating Correct leaving
air temperature using formula in Note 3 under Table 3
40 . 50 60 70 80
11 I 1 03 96 89 82
.14 1 07 1 00 93 86
19 1 1 1 1.05 98 91
install on leaving side to protect fan motor from
overheating; maximum allowable air temperature
over the fan is 140 F.
Ensure compliance with local and/or UL codes,
including those covering distance from combustible
materials and fan discharge, minimum stratification
to avoid condensation on the heater casing, and
positive interlock requirements, as well as other
standard practices outlined in the Carrier System
Design Manual.
Table 2 — Auxiliary Electric
Resistance Heater Data
INDOOR
UNIT
40BA
009
HEATER
SIZE
(kw)
9t
NUMBER
1
OF
HEATERS
2
3t
TOTAL
KW
■ 9
18
27t
HEATER MIN
CAPACITY AIR*
(1000 Btuh) (cfm)
30 6 2500
61.2 2500
91 8 2500
‘Minimum cfm required to ensure safe operation of heater
fMaximum allowable size, number and total kw that may be
mounted on unit discharge
NOTES
1
40BA009 accessory electric resistance heaters are UL approved
for mounting directly to the fan discharge
2 For 10 percent decrease in voltage, decrease input kw and
capacity by 19 percent For 10 increase in voltage, increase
input kw and capacity by 21 percent
Table 3 — Heating Ratings
NONFREEZE SI EAM COILS 2-ROW HOT WATER COILt
UNIT CFM Сарае ity
1 Row
1000 Btuh)
2 Row
L
1 Row
db
2 Row
Co p. Ldb Gpm PD
2,200 06 _ 101 _ 170 132 17 3 5
40RR008 3,000 118 _ 96 - 211 125 21 4 6
3,800 133 - 93 240 119 24 5 5
3,000 126 — 99 — 222 129 22 2 5
40RR012 4,000 150 — 95 — 268 122 27 3,0
5,000 171 92 307 117 31 3 7
4,500 186 348 98 ^361 134 36 Г 9
40RR016 6,000 217 428 94 126 428 126 43 2.5
7,500 248 494 91 121 490 121 49 3.4
6,000 209 406 92 123 ШГ 126 41 -2 4~"
40RR024 8,000 246 492 88 117 500 118 50 3 5
10,000 272 563 8A 112 580 114 58 3 9
7,500 312 _ 99 _ 573 ТТГ 58 "■"" 3.7 "
40RR028 10,000 361 — 96 - 690 124 69 4.8
12,500 406 _ 93 — 786 118 79 6 2
9,000 344 — 95 — 645 Í 22 65 4 4
40RR034 12,000 398 — 91 — 768 119 77 6 0
15,000 443 - 87
- 874 114 87 7 4
12,000 665 _ 111 1035 140 104 8 7
40RR044 16,000 780 — 105 — 1265 133 127 12.6
20,000 875 - 100 1470 128 147 17 1
15 , boo 785 — 109 _ Í 300 T 40 ”“ Тзо "“'“” 9 7
40RR054 20,000 915 - 102 1585 133 159 14 1
25,000 1030 - 98
_____ _
1830 127 183 17,6
. — Capacity (1000 Btuh) NOTES 1 Maximum operating limits for heating coils 200 psig and
Ldb — Leaving Air Dry-Bulb Temp (F)
PD — Pressure Drop (ft water)
‘Based on 2 psig steam, 60 F entering air temperature
tBased on 200 F entering water, 20 F water temperature drop,
60 F entering air temperature
400 F
2 Maximum leaving air temperature 140 F
capacity
3 Leaving db = edb +
Gpm
1 08 X cfm
capacity
500 X water temp drop
10