Carrier 48N Instrukcja Użytkownika Strona 12
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12
MODULATING GAS HEATING CAPACITIES — 48N UNITS
(Natural Gas on All Units)
NOTES:
1. Ratings are approved for altitudes to 2000 ft. At altitudes over
2000 ft, ratings are 4% less for each 1000 ft above sea level.
2. At altitudes up to 2000 ft, the following formula may be used to calcu-
late air temperature rise:
3. At altitudes above 2000 ft, the following formula may be used:
4. Minimum allowable temperature of mixed air entering the heat
exchanger during half-rate (first stage) operation is 35 F. There is no
minimum mixture temperature limitation during full-rate operation.
5. Temperature rise limits: see table.
6. On VAV (variable air volume) applications set the zone terminals to
provide minimum unit heating airflow as indicated in the table upon
command from Heat Interlock Relay (HIR) function.
ELECTRIC HEATER CAPACITIES (460 V ONLY)
NOTES:
1. Minimum CFM is based on 200 per ton.
2. Maximum CFM is based on of 500 per ton for small chassis and 400 per ton for large chassis.
UNIT SIZE
(NOMINAL CAPACITY, TONS)
NOMINAL
CAPACITY
GAS INPUT
(1000 Btuh)
EFFICIENCY
(%)
OUTPUT CAPACITY
(1000 Btuh)
TEMP
RISE (F)
AIRFLOW (Cfm)
Stage 1 Stage 2 Minimum Maximum Min Max
N
(75)
75 Low Heat 108 800 81 87.5 648 10-40 5,250 37,500
75 High Heat 108 1200 81 87.5 972 20-50 5,250 37,500
P
(90)
90 Low Heat 108 800 81 87.5 648 10-40 6,300 45,000
90 Medium Heat 108 1200 81 87.5 972 20-50 6,300 45,000
90 High Heat 108 1600 81 87.5 1296 25-65 6,300 45,000
Q
(105)
105 Low Heat 108 800 81 87.5 648 10-40 7,350 52,500
105 Medium Heat 108 1200 81 87.5 972 20-50 7,350 52,500
105 High Heat 108 1600 81 87.5 1296 25-65 7,350 52,500
R
(120)
120 Low Heat 108 1200 81 87.5 972 15-45 8,400 60,000
120 Medium Heat 108 1600 81 87.5 1296 20-50 8,400 60,000
120 High Heat 108 2000 81 87.5 1620 25-55 8,400 60,000
S
(130)
130 Low Heat 108 1200 81 87.5 972 15-45 9,100 60,000
130 Medium Heat 108 1600 81 87.5 1296 20-50 9,100 60,000
130 High Heat 108 2000 81 87.5 1620 25-55 9,100 60,000
T
(150)
150 Low Heat 108 1200 81 87.5 972 15-45 9,100 60,000
150 Medium Heat 108 1600 81 87.5 1296 20-50 10,500 60,000
150 High Heat 108 2000 81 87.5 1620 25-55 10,500 60,000
't =
maximum output capacity
1.10 x air quantity
't =
maximum output capacity
(.24 x specific weight of air x 60) (air quantity)
UNIT SIZE
(NOMINAL CAPACITY, TONS)
NO. STAGES
LOW
(kW)
CAPACITY
PER
STAGE (%)
MED
(kW)
CAPACITY
PER
STAGE (%)
HIGH
(kW)
CAPACITY
PER
STAGE (%)
MIN
CFM
MAX
CFM
N (75) 2 108 50,100 144 50,100 190 50,100 15,000 37,500
P (90) 2 108 50,100 144 50,100 265 50,100 18,000 45,000
Q (105) 2 108 50,100 144 50,100 265 50,100 18,000 52,500
R (120) 2 144 50,100 265 50,100 300 50,100 24,000 60,000
S (130) 2 144 50,100 265 50,100 300 50,100 24,000 60,000
T (150) 2 144 50,100 265 50,100 300 50,100 24,000 60,000
Ratings and capacities (cont)
- We a t h 1
- Features/Benefits (cont) 2
- Table of contents 2
- Filtration 5
- Gas heat units (48N units) 5
- Model number nomenclature 8
- Quality Assurance 9
- Ratings and capacities 10
- (Natural Gas on All Units) 11
- Ratings and capacities (cont) 12
- Physical data 13
- Physical data (cont) 14
- REFRIGERANT CHARGE 17
- STAGING SEQUENCES (cont) 21
- Options and accessories 24
- SIDE SUPPLY OPENING 26
- OPPOSITE SIDE 26
- BLANK SECTION 26
- Base unit dimensions 28
- Base unit dimensions (cont) 30
- *Vertical discharge only 31
- Accessory dimensions 36
- NOMINAL CAPACITY) 37
- Accessory dimensions (cont) 38
- Performance data 41
- Performance data (cont) 42
- Electrical data 43
- Controls 44
- Heating control options 45
- Controls (cont) 46
- Diagnostics 47
- Control interface 47
- Sequence of operation 49
- 48 Series gas heat units 51
- Application data 53
- Application data (cont) 54
- Typical piping and wiring 55
- Typical wiring schematics 56
- MODULATING GAS HEAT SCHEMATIC 61
- STANDARD GAS HEAT SCHEMATIC 62
- ELECTRIC HEAT SCHEMATIC 63
- A50-8782 63
- 460-V, 24-V CONTROL SCHEMATIC 64
- A48-8665 64
- 575-V, 24-V CONTROL SCHEMATIC 65
- A48-8666 65
- A48-8667 66
- A48-8668 67
- A48-8669 68
- A48-8670 69
- Heat and ComfortLink Controls 71
- HVAC Guide Specifications — 82
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