Carrier 48MA User Manual

Number One
AirConditbning
Maker

Carrier Parkway • Syracuse, N Y 13201

Packaged Rooftop Multizone Units

DX Cooling/Natural or LP Gas, Electric or Hot Water/Glycol Heat

CONTENTS

INTRODUCTION I
PHYSICAL DATA 2
CONSTRUCTION 3

General 3
Electrical - 3
Refrigeration System 3
Heating 5

i-x

....

mm

Page

INTRODUCTION

The Carrier 48MA/50ME modular multizone
differs markedly from the traditional hot deck/
cold deck reheat multizone. Carrier’s packaged
rooftop units do not employ the hot deck/cold
deck principle or the zoning dampers associated
with conventional units.

Carrier’s distinctive design — individual modules
for heating and/or cooling with constant module
airflow, is a true innovation to the multizone
market. The modular units heat, cool or de­humidify in each module simultaneously and
independently of all other modules. Modules can
serve individual zones or be grouped together to
serve larger zones.

The modular multizones are available in 6 sizes
based on cooling capacity.

SYSTEM SELECTION AND OPERATION 7
APPLICATION 10

Diversity 10
Limitations 10

Reheat Applications 11
Economizer 11
Economizer and Exhaust Performance 14
Economizer Economics 15
Night Setback 16

MISCELLANEOUS 19

Sound and Vibration 19 ■;
Thermostat Usage and Control 20

Return Air Systems 20

RATING TABLES 30-41
FAN PERFORMANCE 42

Pulley Selection 42

Balancing Dampers 42

Performance Table 43

HEATING PERFORMANCE 46

Electric 46
Gas 46
Hot Water/Glycol 47

ELECTRICAL DATA 48-52

Power Wiring 52

Capacity

(tons) Modules

15
20
25
28 5
30
37

No. of Unit

8

8 48MA/50ME024
10 48MA/50ME028
10 48MA/50ME030
12 48MA/50ME034
12 48MA/50ME040

Designation

48MA/50ME016

LP or natural gas, electric resistance or hot
water/glycol heating options are available to maxi
mize efficient use of local energy resources. Econo­mizers, power exhaust, roll filters and
high-efficiency filters are also available as factory
installed options - all providing a greater
flexibility in applying the modular multizone to
specific job requirements.

A recent multizone energy study compared the
energy usage of the Carrier modular units with 3
competitive designs. The study simulated (by
computer) the operation of the units for one year
in a typical building in each of 14 major U.S. cities.
The cities represented complete coverage of the

climatic conditions experienced throughout the
country. Study results showed the Carrier multi
zone consumed less energy than the others in each
case considered under all climatic conditions.
Details of the energy study are contained in the

Carrier brochure, The Modular Multizone Versus

the Others.

© Carrier Corporation 1976

Form 50ME-1XA

Table 1 — Physical Data

UNIT 48MA OR SOME

Zone Modules

OPERATING WT (lb)

Bose Unit 48MA
Bose Unit SOME (with heat)

Roof Curb

REFRIG CHARGE (lb, R-22)
COMPRESSOR

No. 1 Type

Cylinders ... Unloaders

No. 2 Type

Cylinders (has no unloaders)

System Oil Charge (pts)
Unlaader Settings (psig)

Left Bank

Right Bank

Loads

Unloads

Loads

Unloads

Capacity Steps (%)

OUTDOOR AIR FANS

Mtr Hp ... Rpm ... Frame (NEMA)

No. 1
No. 2
No. 3

INDOOR AIR FANS

No. ... Size (in.)

Cfm (Norn)

Motor Hp ... Rpm Std

Opt

Fan Pulley

Outside Diameter (in.)
Bore (in..)

Fan Belt No. ... Size w/Std Mtr

w/Opt Mtr

Motor Pulley A

Outside Diam (in.) w/Std Mtr

w/Opt Mtr

Bore (in.)

Resulting Fan Rpm w/Std Mtr

w/Opt Mtr - - - -

Motor Pulley B

Outside Diam (in.) w/Std Mtr 6.0

w/Opt Mtr

Resulting Fan Rpm w/Std Mtr 995

w/Opt Mtr

HEATING SECTION (48MA)

Rise Range

Input (1000 Btuh) Min-Max Total

Each Module

Bonnet Cap. (1000 Btuh) Total

Stage 1/Stoge 1 ± 2

HEATING SECTION (SOME ELEC)
HEATING SECTION (SOME, GLY.)

Max allowable inlet temperature
Max allowable flow, each coil
Solution mixture
Max allowable working pressure
Total internol volume (gals)

PRESSURE SWITCHES

, _ Cutout
Low-Pressure r. ^ .

Cut-in

High-Pressure ^ul^n

Indoor Air Flow Switch (AFS 1)

Factory Setting (cfm)
Adjustment Range (cfm)

INDOOR AIR FILTERS

Std No. ... Size (in.)

High Efficiency (optional)

No. ... Size (in.)

Roll Media (optionol)

0T6

8

3385
2985

_506

28 "

024

8

3805
3405

506

~~32

028

10

4075
3665

506

43

030

10

4080
3670

506
43

Reciprocating Hermetic, 1725 Rpm

06DE537

6 2

06 DE 824

6 .. 2

06DA824

6

22

06DE537

6 . 2

06DA824

6

22

06DE537

6 . . 2

06DA537

6

22

Compressor No. 1 Only

71.0 ± 1 5

57.5 ±25
76 0 + 1 5
62 5 ± 2.5

100,67,33

100,83,67

50,33,17

100,80,60

40,20

100,80,60

40,20

Propeller, Direct Drive

1 . 1075
1 ... 1140

2 ... 15x15

2 . 15x15 2 . 15x15 2 . 15x15

6000 8000 10,000

5 . . 1725

- - - -

10.6
Р/!б

1 3V630 1 ... 3V630 2 ... 3VS60 2 . 3V560

7/2 ... 1725

10.6

10 ... 1725

8 0 8 0

56 (1-phase)
56 (3-phase)

10,000

10 ... 1725

P/16

- - - -

Instai led

Factory

5.3
_ - - -

iVe

880

6.0
1%

995

6 9

— -

1145

- -

5 0

1%

1095

Shippec

5.6

1230

'5 0

1%

1095

With Unit

5 6

1230

2-Stage Furnace Assembly in Each Zone Module

25 F to 55 F at 0 75 in. v^g ESP

240-480

60

360

22.5/45.0

240-480

60

360

22.5/45.0

300-600 I 300-600 I 360-720

60 60 60

450 450 540

22.5/45.0 I 22.5/45.0 j 22.5/45.0

See Electrical Data Table for Electric Heat Data

1 Heating Coil in each Zone Module

ZOO F

6 gpm

20% glycol

30 psig

2.61

2.61

3.15 ] 3.15 1

29 ± 5 psig

39 ± 5 psig
400 ± 5 psig
300 ± 5 psig

6000

4000-6000

12 ... 20x25x2

Same but with 36.5% efficiency (NBS Dust Spot Test)

65 ft of 2-in. media

034

040

12

4800
4400

5700
5250

630
57

06DE537

6 ... 2

06DA537

"65 “■

06EE250

4 . . 1

06EA250

6

21

31

75.5 ± 1 5

58.0 ±25

100,83,67

50,33,17

100,75,

50,25

I 1 1140 . 56 (3-ph)

3 ... 15x9 3 . 15x9

12,000

15 ... 1725

20 ... 1725

12,000
15 ... 1725
20 ... 1725

8 0
1“/б 1‘Мб

2 3V630

3 . 3V670

2 ... 3V630
3 . . 3V670

5 0 5.0

6.0
1% 1%

1095
1320

1095
1320

5 6 5.6

6.5 6.5

1230 1230
1425 1 1425

360-720

22.5/45.0

3 76

3.76

9000

6000-9000

12

630

4

8.0

6.0

60

540

О

CONSTRUCTION

General — Carrier Modular multizones are sturdy

and lightweight. The units are ideal for rooftop
applications where low silhouettes are required.

^|p Maximum height of any 48MA/50ME unit

mounted on a matching roof curb is less than 5
feet. Each unit is of one-piece design with extruded
aluminum frame and 26 ga steel top and side panel
construction. Panels are easily removed for access
to unit interior. Assembled, the insulated unit will
not sweat at 77 E wet-bulb on cooling days. The
unit insulation conserves heat energy in the winter,
keeping energy costs to a minimum.

The unit roof curb, constructed of 14 ga
galvanized steel, is National Roofing Con
tractors Association (NRCA) approved. A
condenser run-off sheet is built into the curb and is
insulated to prevent heat transfer. The curb is
designed to be flashed to the roof and includes
wood nailers to aid installation. All duct and utility
connections are inside the curb perimeter.

Service access on side panels is accomplished by
removing latches on each side of panel. The side
panel gaskets provide complete perimeter sealing
when compressed against the base unit frame. Each
48MA/50ME unit has large, waterproof condensate
pans to prevent moisture leakage into the con
ditioned space. Galvanneal steel panel surfaces are
bonderized and finished with Carrier Weather
Armor, a baked enamel finish.

Enters are 2-in. throwaway fiberglass with an
NBS efficiency of 10%. High efficiency (36.5%
NBS) throwaway filters are available as a factory­installed option. With 41.5 square feet of zone

filter area standard, both the low- and high-

efficiency filters are extremely effective. With this
large area, filter velocity is low — 335 fpm in the
48MA/50ME040 and 145 fpm in the 48MA/

50ME016. A roll filter package is available as a

factory-installed option.

The package consists of 65 ft of 2-in. filter
media, automatic media advance switch, advance
motor and a runout switch. Outside air is drawn
into the unit thru louvered side panels and pre
filtered by cleanable outdoor air filters in the
panels.

Electrical — The Carrier Modular multizones

include factory-installed power and control circuit
breakers which are suitable for use as disconnect
switches where local codes permit. A 350-va,

115-volt convenience outlet on the main control

panel allows use of a trouble light or small power

tools.

Etched solid copper circuit panels with inter
changeable plug-in relays and marked terminal
boards are used in all units to improve reliability
and simplify the modular design. Conventional
commercial 24-volt, 2-stage heat/2-stage cool

thermostats are readily wired to marked terminals
on the zone control board. Modules combined to
make a single, large zone are controlled by a single
thermostat by wiring the zone module control
terminals as illustrated in thermostat usage section
using factory-supplied jumpers.

Refrigeration System — The modular multizone

units incorporate individual zone evaporator coils
plus an outdoor air (Humidry®) evaporator coil
(see Eig. 1). The zone coils are controlled by room
thermostats thru a liquid line solenoid valve. The
metering device for the zone evaporators is a
capillary tube.

The outdoor air evaporator coil cools and
dehumidifies the outside air drawn into the unit.
This coil is a “free floating” coil; that is, after the
first zone cooling coil is activated by cooling
demand, the outdoor air coil is controlled by
suction pressure only. Since the outdoor air evap

orator coil handles a varying load, a thermal

expansion valve is used to meter the correct

amount of liquid refrigerant to this coil.

The load on unit compressors varies depending
on outdoor air coil load and the number of zone
coils in operation simultaneously. Compressor
unloaders and hot gas bypass valves are employed

to compensate for the variation. The 15-ton unit

unloads to 1/3 or 5 tons, the 20-ton unit to 1/6 or

3.3 tons, the 25-ton unit to 1/5 or 5 tons, the
28-ton unit to 1/6 or 4.7 tons, the 30-ton unit to

1/6 or 5 tons, and the 37-ton unit to 1/4 or 9.3
tons. The unloaders operate from suction pressure
to maintain system suction temperature between
32 and 45 E. If the load is less than the minimum
step indicated above, a hot gas bypass valve meters

hot gas into the outdoor air coil to provide an

additional load to the system. This keeps the
compressor on the line and prevents the coils from

icing up due to low suction temperature.

Since the outdoor air coil would become a
condenser when the ambient temperature is below
the suction temperature, a thermostat closes the
outdoor air damper if the ambient drops below
32 E and compressors are operating. If there is no
airflow across the outdoor coil, there is no heat
transfer and the coil becomes an extension of the
refrigerant piping.

Head pressure is maintained by cycling one or 2
condenser fans with a condensing pressure switch
and modulating the remaining fan with a Motor­master® solid state speed controller, permitting
operation of the refrigerant system to -20

ambient. The Carrier modular design is not de

pendent on an economizer cycle for cooling at low

outdoor temperatures. (A factory-installed econo

mizer option is available.)

All multizone units function satisfactorily in

the full cooling or full heating mode. However, at

Fig. 1 — Refrigerant Piping Schematic (10-Zone Units Shown, 8- and 12-Zone Units Similar)

partial load operation, difficulties arise in conven
tional hot deck/cold deck units. When some zones
are at full heat, some at partial heat, some at
partial cooling, conventional multizones must
operate the hot and cold decks simultaneously at
high energy cost. The Carrier Modular design
satisfies each zone’s demand by a discrete
module(s). There are no hot decks, cold decks or
zone air mixing dampers to waste energy. The only
energy expended is that required to heat or cool
the individual zone. Since there is no mixing,
energy is saved and operating costs are significantly
lowered. In addition, the control system provides
excellent humidity and temperature control. Multi
stage cooling is available on larger zones where 2 or
more modules are used for efficient control of
zone space requirements.

The following features and safety devices are

provided on the refrigerant cycle:

1. Suction line accumulator

2. Crankcase heaters

3. High- and low-pressure switches

4. Discharge line thermostat

5. Time Guard® circuit

6. Airflow switch for indoor fan motor

7. Internal motor protection thermostats em
bedded in compressor motor windings

8. Hot gas bypass capability

9. Compressor unloading capability

10. Filter-driers

PSYCHROMETRICS ^ The 48MA/50ME units
differ psychrometrically from the conventional
multizones due to the operation of the outdoor air
coil. The coil in the Carrier units cools and
dehumidifies the outdoor air entering the unit thus
assuring that raw outdoor air is not passed along to
the zones. This air treatment by the outdoor air
coil (and also by the zone module evaporator coils)
provides excellent low load performance and
precise temperature control to the conditioned
space. The only large load variation occurs on the
outdoor air coil where a thermal expansion valve is
used. This allows the use of simple capillary tube
expansion devices on the zone coils. The zone coils
cool and dehumidify a mixture of return air and
outdoor air — outdoor air at the approximate dew
point temperature of the return air.

The psychrometric chart (Figure 2) illustrates
this air treatment for a typical set of conditions. As
an example: 1000 cfm of outdoor air at 95 F/75 F
having 99 grains moisture content enters the
outdoor air coil and is cooled and treated so that
the air leaving the coil has 68 grains of moisture
content. The outdoor air coil under these con
ditions has a capacity of 60,000 Btuh of which
39,000 Btuh is sensible. This is a coil sensible heat
factor of 0.65. By examining the room conditions,
it is evident that the outdoor air coil is very
effective in removing the latent load. At 75 F/50%,
the room content is 64 grains of moisture. The
percent moisture removed with respect to room
conditions is:

GRAINS OF MOISTURE/

LBS OF DRY AIR

% removed

99 - 68
99 - 64

100 =

88.5%

The 1000 cfm of outdoor air at 68 grains is mixed
with 8000 cfm of return air at 75 F/50% room
conditions (64 grains). This mixture then enters
the zone modules and is cooled and dehumidified
by the zone coil.

Heating (General) — The 48MA/50ME modular

multizone units offer a wide range of factory­installed heating options.

In all cases, the modular design provides a

number of small heating steps to maintain very
close discharge temperature control without wide
variation. Conventional multizones cycle a few
large increments to maintain the necessary hot

deck temperatures and, thus, cannot control dis

charge temperature as well as the modular units.

Another feature of the modular design is the
reduced impact of heater malfunction. Any unit
can have a malfunction — such as an open coil in a
relay or contactor or gas valve failure in a gas-fired
unit. The Carrier 48MA/50ME units, with 8, 10 or

12 independent heating sections, would experience
heat failure in one module only and all others
would operate normally. Conventional multizones
could lose a large percentage of heating capacity or

the entire heat source in the hot deck could
become inactive.

The Carrier modular multizone units are de
signed to provide reliability, serviceability, oper
ating economy and comfort control — features
difficult to match with conventional hot deck/cold
deck reheat multizone units.

GAS HEATING SYSTEM (48MA) Each module
has a 2-stage burner, with one pilot per pair of
modules. The first-stage gas valve (115-v) controls
gas flow to the main orifice and to the second-stage
valve. A 24-v solenoid valve provides gas to the
second stage when open (see Eig. 3). Both heating
stages are contained in one valve body.

The gas heating section has standing pilots and
continuous forced draft combustion. The pilots
have automatic spark relight for dependable
ignition.

The 48MA modular multizone has individual 18
ga Chromized steel heat exchangers and stainless
steel main burners in each module.

Safety features on the heating system include:

1. A.G.A. certification of the entire unit design as '
well as the furnace section.

2. Airflow switch for indoor fan motor.

3. Airflow switch for forced draft fan motors.

4. Door switch for combustion compartment.

5. Pilot switch to ensure a pilot flame

GV - Gas Vaive (Zone Module)

MOTSS:

t

MS ~ Main Burner

Pirst stage of gas valve is a 115-vott sok-noid; second stage is a
24-voit soienoid with .60% gas bvpess.
Gnits 48MA034 ano 040 fi ave one pilot shotoff valve feeding all
pilot burners.

Unit is eouipped with a forced-draft blower and: the foiiowing

Fig. 3 — Gas Piping Schematic (10-Zone 48MA Unit Shown, 8- and 12-Zone Units Similar)

MGV ­PS -

Main Gas Vaive
Pilot Sorrier

safety devices: forced-draft airfiow switcfi, tiame rcll-oot pro
tection switch, combustion dtarnbet access door switch, heating
lirrtt switches, and soark-ignitecl automatic pilots. Al! of these
switches are iccateci in the heating section and rrtust. be in safe
condition before tfie inain burners can ignite.

PV ~ Pilot Valve (shutoff;

6. Heating limit switches.

7. Flame rollout protection switch.
In special applications where natural gas supply

is limited, units must be modified to operate under
derated input/output conditions. The 48MA modu
lar multizones can be derated by changing the zone
module burner spuds and gas valve orifices as
follows:

NATURAL GAS FIRED UNITS

TOTAL MODULE

DERATED INPUT (%)
High F ire/Low Fire

90/45

80/40
70/35

SPUD SIZE

No 36
No 38
No 41
No 43

GAS VALVE

ORIFICE SIZE

No 36
No. 38
No. 41
No 43

Under these conditions, the units still have 2 stages
of derated heat input. Derating below these limits
is not approved. If single-stage heat is acceptable,
disconnect high fire stage to permit each module
low fire input only (% as shown under low fire).

Contact Carrier Service Department before de

rating to the above limits.
ELECTRIC HEATING SYSTEM (SOME) - The

SOME electric heating system contains single-phase
Nichrome wire coils (see Fig. 4), wired and phase
balanced to provide 2 or 3 steps of heat control.
Each zone has 2 or 3 steps of strip heat available,
controlled simultaneously by the zone thermostat
and the outdoor air thermostat. When heat is
required, the first stage of zone thermostat ener
gizes the first step of zone heating. The second step
(on 3-step units) of heating is controlled by the
second stage of the zone thermostat. The second

(on 2-stage units) and third step of heating is
controlled by the outside air thermostat (OAT.)
and operates simultaneously with the second stage
of the thermostat (on 3-stage units) when the
outside air temperatures are below OAT. setpoint.
The setpoint on the outside air thermostat is
adjustable from 0 to 55 F.

Safety features include:

1. UL certification on entire unit, as well as
electric heat section

2. Manual reset circuit breakers

3. Klixon high-temperature protection

4. Airflow safety for indoor fan motor

5. Fusible links in each heater phase

6. Two-pole contactors on each element

Fig. 4 — Electric Heating Unit (50ME)

нот WATER/GLYCOL HEATING SYSTEM -

Hot water is a frequent selection for heating due to
simplicity of the piping system, the ease in
maintaining uniform temperature control and
quieter operation. In addition, when renovating an
existing building, a hot water heating plant is
usually available.

Carrier’s hot water/glycol heating option

(Fig. 5) is ideally suited for these renovations. Each

zone module has its own high capacity heating coil.

All controls, solenoid operated shutoff valve and

balancing valves are included in the option. There
is no internal piping or wiring; only one connection
is required for supply and return hot water/glycol.
The option does not include internal pressure relief

for partial load operation. External piping to the
unit must be in accordance with existing codes. It
must include proper relief for water flow (the

maximum allowable hot water/glycol system work
ing pressure is 30 psi.) or a modulating control to

compensate for decrease in water flow rate to zone
coils under partial load conditions when some coils

are cycled closed. System heater coils are designed

for operation with a water/glycol solution of 20%

minimum glycol for proper freeze-up protection.

Figure 35 located in the Heating Capacity Section,

page 47 portrays an example of selecting and rating

hot water/glycol heating coils for use with SOME

multizone units.

The hot water/glycol option is not intended for
use on a steam system. Where steam is the only
heating medium available, a steam-to-water con
verter or a steam-to-water interchanger should be
used.

typical multizone design considerations. Using the
Engineering Guide, calculate cooling and heating
load estimates for the areas to be served by the
multizone unit. Divide each area into zones based
on the peak load and control requirements within

the area.

The resulting loads in a typical building have

been calculated as follows:
Cooling

Grand Total Load (GTE) .................... 275,000 Btuh

Sensible Load (SL)

..............................

215,000 Btuh

Room Design....................................75 F db/50% Rh

Outdoor Air (OA) Cfm

.......................................

1000

OA Ambient Temperature .... 95 F db/75 F wb

Electric Power Source

у XT Room Total Load* Room Sensible Load
zone JNo. (RTL)/Zone (RSL)/Zone

1 19,000 Btuh 16,935 Btuh
2 25,000 Btuh 22,505 Btuh
3 25,000 Btuh 22,505 Btuh
4 70,000 Btuh 59,160 Btuh
5 22,000 Btuh 19,720 Btuh
6 25,000 Btuh 22,505 Btuh
7 40,000 Btuh 33,870 Btuh

Total 226,000 Btuh 197,200 Btuh

*Loads are peak loads.

.................................

460/3/60

Heating (Electric Resistance Heat required)

Zone No

1 34,000 Btuh 10.0 kw

2
3
4 111,000 Btuh 32.5 kw
5
6
7

Total*

*Zone Peak Capacities.

Heating Load/Zone

44,000 Btuh 12.9 kw
44,000 Btuh

42,000 Btuh 12.3 kw
44,000 Btuh
81,000 Btuh

400,000 Btuh

Electric Resistance/Zone

12 9kw

12 9kw

23 7 kw

117 2 kw

Fig. 5 — Hot Water/Glycol Heating (50ME)

SYSTEM SELECTION AND OPERATION

To better understand the actual operation of
the modular multizone, a typical design example is
provided.

Refer to Carrier’s Engineering Guide for Multi

zone Unit Systems and contents of this booklet for

Selection:

Due to the many heating options and ranges on
each 48MA/50ME unit, multizone unit selection is
normally based on cooling load requirements.
Enter the 48MA/50ME rating tables in the Per
formance Data Section and select the unit that
meets or exceeds the grand total load at the
specified conditions. (Interpolation may be neces
sary to obtain unit rating at certain conditions;
extrapolations are not advised. Contact Carrier
Engineering for performance data at points beyond
the range of published tables.) The 024 size unit
does not have sufficient capacity to meet load
requirements at any cfm. The 028 size exceeds
load requirements; however, it is the smallest unit
that meets specifications. Thus, the 48MA/“'
50ME028 at: 9000 cfm; 1000 cfm OA; 95 F/75
OA temperature; and 75 F/50% Rh room design
has a TC of 282,000 Btuh, SHC of 219,000 Btuh,
compressor kw of 27.5 and a RSHF of .835.
Calculate the RTC and the RSHC by deducting the
outdoor air load from the unit capacity.

The outdoor air load with respect to room condi-

as follows:

outdoor ail

total heat (OATH) = 4 5 (hgg:,- Ьго,ошХ (OA cfm)

= 4.5 (38.61 - 28.29) (1000)
= 46,440 Btuh

Or, a graph, shown 'in Fig. 6, can be used to find
the OA load factor, 4.5 (hoa “ hfoom). for all

conditions illustrated in the 48MA/50ME rating

tables (Performance Rating Section). Thus,

OATH = (OA load factor) (OA cfm)

= (46.5) (1000)
= 46,500 Btuh

which agrees with the above calculation.

Outdoor air
sensible heat (OASH) = 1.09 (toa ■" boom) (OA cfm)

= 1.09(95 - 75) (1000)
= 21,800 Btuh

<

О

2

u.

0

\

1

z>

H

Ш

Q

<

о

<

I-

o

h-

Ш

a

CO

I-

Э

о

OA WET BULB

Fig. 6 — Outdoor Air Load Selection Chart

8

The unit capacity available to offset room loads is.

Room TC = Unit TC — outdoor air TC

= 282,000 -46,500
= 235,500 Btuh

Room SHC = Unit SHC — outdoor air sensible heat

= 219,000 -21,800
= 197,200 Btuh

For comparison:

GTL
SL
RTL
RSL

Load

275.000 Btuh

215.000 Btuh

226.000 Btuh
197,200 Btuh

Unit Capacity

TC = 282,000 Btuh

SHC = 219,000 Btuh
RTC = 235,500 Btuh
RSHC = 197,200 Btuh

The 48MA/50ME size meets or exceeds the
total and zone load requirements at the specified
conditions. The excess RTC decreases space
average relative humidity slightly below the room
design of 50%. By increasing air quantity above
9000 cfm, this excess latent capacity can be
converted to additional sensible capacity if desired.

Since the modular multizone is a constant

volume machine, the selected supply cfm per zone

must be proportioned to satisfy each zone’s peak
load condition.

Room sensible capacities (RSC) are divided
equally among the modules if an equal cfm is going
to each. In this example, the 48MA/50ME028 has

10 modules and the nominal cfm is 900 cfm per

module.

The cfm to each zone can be varied (with
field-supplied manual dampers in zone ducts) to
match different zone requirements, but since the

original rating was based on 9000 cfm supply air,
all variations must total 9000 cfm. The effects of

changing cfm quantities on room TC and room

SHC in each module are shown in Fig. 7. When the

cfm is changed (by some percent) from the

nominal in a specific module, then the room
capacity multipliers in Fig. 7 are used to correct
room TC and room SHC. Capacity versus cfm

changes for the example is given in Table 2.

By analyzing each zone’s ratio of deviation
from equal sensible heat allocation, the proper cfm
change is determined. In the example, if building
room SHC is 197,200 Btuh and 10 zones are used,
each zone’s normal room SHC is 19,720 Btuh. But

if zone 3 has 22.505 Btuh room SHC, then by ratio
of 22,505 : 19,720 or 1.14, the cfm change is

+20% (see Fig. 7). Correspondingly, if zone 1 had

16,935 Btuh room SHC, the cfm change is -20%.

In applications where the zone selection is not
an increment of the number of unit modules (i.e.
one zone requiring 500 cfm in a 48MA/50ME028
with 10,000 cfm), refer to Module Cfm Limits,
page 10, for details on using cfm’s below
600 cfm/module.

Formulas required to use ratings are:

Outdoor Air Total Heat (OATH)

OATH = 4.5 (OA cfm) (hoa-hioom)

Outdoor Air Sensible Heat (OASH)

OASH = 1.09 (OA cfm) (toa ~ troom)

Room Total Capacity (RTC)

RTC = Unit TC-OATH

Room Sensible Heat Capacity (RSHC)

RSHC = Unit SHC - OASH

Room Sensible Heat Factor (RSHF)

portp _ RSHC

Leaving Air Temperature (LAT)

LAT = room temperature

RSHC

1.09 cfm

Determine Heating Capacity:

The specified requirement for electric heat
dictates the selection of a 50ME028 unit with a kw
option that meets or exceeds the heating load.

Table 9, page 50 indicates that the 028 unit has

heating capacity options of 66, 88 and 132 kw.
The 132 kw option is selected as it provides

adequate heat for this application. The kw/zone
and number of heat stages available are:

Zone No.

1
2

3
4
5
6
7

Total

Load

10.0 kw
kw 13.2 kw

12.9

12.9 kw
kw

32.5
kw 13 2

12.3
kw 31.2 kw

12.9

23.7 kw 26 4 kw

117.2 kw 132.0 kw 30

Zone Heating

Capacity

13.2

kw

13.2 kw
kw

39.6
kw

Stages

of Heat

3
3
3
9
3
3
6

Stages of heat are controlled individually in the
small zones or collectively in large zones to provide
flexible and continuous control for each zone.

Table 2 — Capacity vs Cfm Changes

ZONE

*Unit total capacity multiplier is obtained from Fig. 7. Use % change from nominal and read multiplier from graph.

RSHC — Room Sensible Heat Capacity RSL — Room Sensible Load RTC — Room Total Capacity

NO. OF

NO.

MODULES

1 1 16,935 16,935/19,720 = 86
2
3 1 22,505
4 3 59,160 59,160/3 X 19,720 = 1.00 0 2700 1 0
5 1
6
7

1 22,505

1 22,505 22,505/19,720 =1.14 +20 1080 1.1

10 197,200 9000

2

RSL/ZONE

PEAK LOAD

19,720 19,720/19,720 =1.00 0

33,870

% DEVIATION

(RSL/NOM UNIT RSHC)

22,505/19,720 =1.14
22,505/19,720 =1.14

33,870/2 x19,720 = .86

% CFM CHANGE
FROM NOMINAL

-20
[phone]
[phone]

-20 1440 .9

UNIT TOTAL

CFM

CAPACITY

MULTIPLIER*

720

900 1.0

X

9

X
X
X
X
X
X
X

UNIT

NOMINAL

RTC/ZONE

23,550
23,550
23,550

3 X 23,550

23,550
23,550

2 X 23,550

ADJUSTED

UNIT RTC

21,195
25,905
25,905
70,650
23,550
25,905
42,390

235,500

LJ

a

z>

2

a:

II

2

O

O

•% CFM CHANGE ■

FROM NOMINAL

I 0

95

90

85

<

a.

<

80

75

Fig. 7 — 48MA/50ME Room Capacity Multipliers

Power Wiring Data — The 50ME028, 460-3-60 unit

with 132 kw of electric resistance heat, has a 75.8
cooling circuit minimum wire ampere and a heating
circuit minimum wire ampere of 207.0. If any
module is operating on mechanical cooling (com
pressor operating), one heating stage in each

module is locked out and cannot be energized.

This, a common feeder can be sized for minimum

wire ampere of 221 (see Fig. 37).

APPLICATION

Diversity — The size, shape and orientation of the

building — as well as the application and location
of zones, influence the degree of diversity that may
be applied to a multizone system.

Since the normal application of multizone units
involves zones where loads are shifting due to solar
energy, people, equipment and lights, diversity will
exist.

The Carrier modular multizones will be affected
by building diversity only on the refrigeration
system. When a particular zone (or zones) thermo
stats are satisfied, a solenoid shuts off the zone
evaporator coil. This enables more refrigerant to

flow to other operating zone coils, creating a larger
capacity for that zone. However, the diversity will
lower the selected unit total capacities.

The 48MA/50ME ratings do not reflect diver
sity but can be converted to diversity ratings by
using the capacity correction factors and formulas
in Table 3.

Table 3 — Capacity Correction Factor (CCF)

LOAD

TC (Unit)

SHC (Unit)

RTC (with diversity)

RSHC (with diversity)

DIVERSITY FACTOR

1.0

1 0
1 0

90 .80

97
94

[TC (CCF) - OATH]

(Diversity Factor)

[SHC (CCF) - OASH]

Diversity Factor

94
89

This is accomplished by rating the unit assum

ing that no more than 9 of 10 zones would be on

at one time, 90% diversity. The same logic applies
to other diversity factors on an average basis, such
as 85 or 95%.

A rating with a diversity factor results in a
lower room SHF; therefore, a reselection at a
higher total unit cfm is advisable to take full

advantage of the building diversity.

Limitations

MODULE CFM LIMITS AND FAN PER
FORMANCE — The cfm limits per zone are

1200 cfm maximum and 600 cfm minimum. The

10

outboard zones in the 8-, 10- and 12-module units
are limited to a maximum of 1000 cfm. The
maximum limit is necessary to prevent blow-off to

the heat exchangers and into the ductwork. The
minimum limit prevents burner cycling on limit
switches and prevents electric heater cycling. At
reduced cfm’s, zone evaporator coils overfeed
refrigerant, but there is no liquid flood-back to the
compressor as it is protected by a suction line
accumulator.

For applications below 600 cfm, it is recom

mended that the heating controls be modified as

follows:

Gas fired (300 to 599 cfm) — Use first-stage
heat only, deactivate second stage.

Electric Resistance (450 to 599 cfm) — Use
first- and second-stage heat on 3-stage units.

Electric Resistance (300 to 449 cfm) — Use
first-stage heat on 2- or 3-stage heat units.

Optimum performance is delivered in the 800 to

1000 cfm range. Extremely low cfm requirements

reduce unit cooling capacity. Low zone cfm

applications may also be handled by sizing the
zone for a higher cfm (to increase unit efficiency)

and diverting the extra air into the return air

system or a larger interior space. Extra air should

not be diverted into spaces with different
perimeter wall orientations.

Fan performance data. Table 4 and Fig. 32, 33
and 34, (Fan Curves) are located in the Fan
Performance Section and are based on 15% out
door air. When the outdoor air dampers are closed
and there is no outdoor ventilation air into the
unit, unit cfm is reduced by 2 to 6%. This
reduction is due to the static pressure drops
existing in the separate airflows thru the unit. This
reduction should be considered in special applica
tions where little or no ventilation is required and
cfm requirements are critically designed.

MAXIMUM VENTILATION LIMITS Under
normal mechanical cooling, the amount of ventila
tion air that can be introduced is a function of the
outdoor air damper setting and negative static

pressure at the return air intake of the unit. Figures

8 thru 11 show ventilation air versus negative static

pressure at various settings of the outdoor air

damper. A 5.5 setting of the ventilation control
dial is the maximum opening of the dampers. The

ventilation dial can be set in any position from 0 to

5.5 to obtain the desired cfm of outdoor air. The

ventilation dial is located on the control panel

adjacent to the heating section.

Reheat Applications — A space with a high latent

load and a very low sensible load may require

reheat capability for dehumidification. Typical
spaces of this type are conference rooms or visual
aids rooms where people congregate with the lights
out.

Reheat control is achieved on the 48MA/50ME
unit by wiring a humidistat (Fig. 12) in parallel
with the cooling thermostat on any zone requiring
reheat capability. This may be done on one module
or all modules. When using reheat control on
electric resistance heat units, extreme care must be
exercised with power wiring as heating and cooling
can operate simultaneously in each module.

When the zone’s humidity level reaches the
setpoint of the humidistat, mechanical refrigera
tion is activated for that zone module and the air is
dehumidified and then reheated on thermostat
demand before being discharged to the zoned
space.

The 48MA/50ME Economizer — The 48MA/50ME

units can be equipped with an economizer control.
The control functions as follows: with ambient
temperatures above the economizer changeover
point, the outdoor air damper is set at the
ventilation position, cooling is accomplished by the
compressors when the room thermostat calls for
cooling. If the zone is not calling for cooling, the
mixed air is circulated thru the space. When the
ambient temperature drops below the economizer
changeover point, the compressors are locked out
and the damper motor is under control of a mixed
air thermostat to maintain a mixed air temperature
low enough to provide cooling when the room
thermostat demands it. (See Fig. 13.)

11

3,000

100

I 15 2 25 3 .4 5 .6 7 8 9 10

NEGATIVE STATIC PRESSURE AT UNIT RETURN

Fig. 8 — Ventilation Air Chart,

48MA/50ME016

Fig. 9 — Ventilation Air Chart,

48MA/50ME024

Fig. 10 — Ventilation Air Chart,

48MA/50ME028,030

Fig. 11 — Ventilation Air Chart,

48MA/50ME034,040

12

If a zone thermostat calls for cooling while in
economizer mode, a set of cooling relay (CR)
contacts close, energizing the economizer relay
(ECR). See Fig. 14. The ECR is a DPDT plug-in
relay. For economizer damper control, the ECR
locks out the outside air damper adjustable poten
tiometer and shifts the damper control to a Mixed
Air Thermostat (MAT.). The MAT. sensor, located
in the fan section, adjusts the outside air damper to
maintain a preset mixed air temperature (see
Fig. 15).

The 48MA/50ME economizer operation pro

vides economic use of outdoor air for low-cost

cooling. When all zone cooling thermostats are
satisfied, economizer controls are bypassed and the
outdoor dampers are modulated to the minimum

ventilation position. The mixed air temperature

increases, minimizing the amount of reheat re
quired in other zones that require heating.

Refer to Economizer Economics, page 15 to
determine if the addition of an economizer is

justified.

Г

HA — Heat Anticipator S)

Hu - H umidistat
TC — Thermostat, Cooling
TH — Thermostat, Heating

-------------------

----------------------

~l LI

LEGEND

-------

Fig. 12 — Humidistat Connections

Screw Terminal
Printed Circuit

Factory Control Wires

Field Wiring

SEQUENCE;

1 — Ambient temperature decreases
2 — Compressor is locked out by economizer control thermostat
3 — Outside air damper is regulated by mixed air thermostat

to maintain fixed mixed air temperature

Fig. 13 — Economizer Operation

C — Compressor Contactor
CCP — Capacity Control Pressurestat
CHR — Crankcase Heater Relay
CR — Cooling Relay
DLT — Discharge Line Thermostat
ECR — Economizer Relay
ECT — Economizer Thermostat
EXC — Exhaust Motor Contactor
EXR — Exhaust Relay

FCPS — Ean Cycling Pressurestat
HPS — High Pressure Switch
HR — Holding Relay
IT — Internal Thermostat
LPS — Low-Pressure Switch
MCR — Master Cooling Relay
MHR — Master Heating Relay
OFC — Outdoor Fan Contactor
TM - Ti mer Motor

LEGEND

Fig. 14 — Economizer Condensing Schematic

13

OA damper adjust

MOTOR POT

CHR — Crankcase Heater Relay
ECR — Economizer Relay
LAT — Low Ambient Thermostat
OA — Outside Air

Fig. 15 — Economizer Damper Control Schematic

Economizer And Exhaust Performance — An

MIXED AIR THERMOSTAT

LEGEND

economizer can be readily factory installed on the
48MA/50ME since the damper motor and outdoor
air damper are standard equipment. The econo
mizer package consists of a return air damper,
linkage, plug-in relays, MAT. wiring, and mixed air
thermostat.

When the 48MA/50ME unit is on full econo

mizer control, the supply cfm to the space drops

off slightly since the resistance of the outdoor air

intake is generally greater than that of the return

air ductwork. To partially offset this, the return air
dampers have a built-in bypass.

With the outdoor air dampers fully open and
the return air dampers fully closed, the total cfm
drops 15%. The total cfm consists of 70% outdoor
air and 30% return air thru the built-in bypass. If,
for example, the unit normally operates at

10,000 cfm supply air, the minimum supply cfm
when the economizer is operational is 8500. This
8500 cfm consists of 6000 cfm outdoor air and
2500 cfm return air. As the ambient temperature
drops from 48 F (recommended economizer set­point), the proportion of outdoor air to the supply
air required to maintain mixed air temperature is

less, the outdoor air damper begins to close, and
return air damper begins to open (see Fig. 13). As

this happens, total supply cfm progressively
increases from 8500 cfm to 10,000 cfm (design).

An exhaust damper option is also available for

use with the economizer. It is located between the

return air plenum and the condenser fans. The
option consists of a TPDT plug-in relay (EXR), an
exhaust damper, and a plug-in jumper. The damper
provides a forced exhaust of indoor air during the
economizer operation. The exhaust damper opens
when the return air damper is 25% closed. With the
damper installed, ECR and EXR are energized
simultaneously. The EXR locks out outdoor fan
motor (OFM) controls (32LT on OFMl and FCPS
on OFM2 and OFM3) and outdoor (condensing)
fan motors operate at full speed, discharging excess
return air to the atmosphere thru the open exhaust
damper (see Fig. 16).

The 48MA/50ME exhaust operation is similar
in performance to a relief damper except that the
exhaust dampers are mechanically linked to the
return air dampers and the condenser fans operate
to produce a pressure differential which aids the
exhaust cycle. At approximately 0 in. wg at the
return air opening, the 48MA/50ME units exhaust
between 150 to 200 cfm/ton. With positive return
static, more air is exhausted. At -0.40 in. wg
(.25 in. wg on the 016 unit) return air static,
exhaust capabilities of the units drop to zero.

In the example, the 4000 cfm exhausted at
0 in. return static accounts for all but 1100 cfm
outdoor air introduced by the economizer outside
air section. In practice, this excess cfm is con
sidered a nominal ventilation rate, slightly pres
surizing a building to eliminate drafts and
unwanted air seepage. This excess air filters out of
the building thru doors and window spaces. The

^slight positive pressurization of the building aids

the exhaust fans in removing air. If, however, the
balance between the building static and exhaust
system leaves the building with unacceptably high
positive static pressures, a relief ventilator or roof
power exhauster may be used. For extensive or

SEQUENCE:

1 — Return damper closes 25%.

2 — The exhaust damper opens
3 — The OFM (condensing fans) speed controls are bypassed and

fans run full speed, exhausting return air to atmosphere

Fig. 16 — Exhaust Damper Operation

14

m

complicated return air duct systems with static
pressure greater than -0.2 in. wg at the return air
plenum, duct mounted return air exhaust fans can
be installed for proper airflow. However, return air

exhaust fans add to the operating cost and increase

noise level. More efficient duct design methods
should be investigated to eliminate the need for
special return air exhaust fans.

Economizer Economics — Economizer control on a

multizone unit does not necessarily reduce

operating cost as it would on a single zone unit. A

single zone unit either heats or cools; a multizone

unit can do both simultaneously. Therefore, in a

multizone, the economizer operates to maintain a

mixed air temperature low enough to cool a zone

with a high internal load. The remaining zones

requiring less cooling or heating must have heat
added to offset cooling capacity available but not
needed. This is true of any multizone with any
type of control system.

The amount of heat required to neutralize the

overcooling capacity is dependent on:

1. The percent cooling capacity required from the
unit, and

2. The mixed air temperature required to satisfy
the zone with the highest internal load.

As the ambient temperature drops, the percent

of outdoor air needed to maintain a mixed air

temperature is less. Since the reheat or wasted heat
added is a function of the difference between
outdoor air introduced and ventilation rate,
operating cost is reduced at lower ambients. A high

ventilation rate also reduces the reheat requirement

and associated cost. The following example illus
trates the need for a careful analysis of job
requirements before arbitrarily selecting on econo
mizer control.

Example:

A 48MA/50ME unit is operating with econo

mizer control and supplying 10,000 cfm of 55 F
mixed air. The normal ventilation rate is 2000 cfm.
Assuming a realistic cooling load of 50%, 5000 cfm

of the 55 F air is used for cooling. Since the

ventilation rate is 2000 cfm, half is sent to the

cooling zones leaving 4000 cfm of low-cost cool

ing. The remaining 5000 cfm of 55 F air, including

1000 cfm of ventilation air, is going to zones with
either no load or a heating load and must be
neutralized.

Although 4000 cfm or low-cost cooling is ob
tained, an extra 4000 cfm of air must be heated to
some degree above and beyond that in a unit
without economizer controls.

For an identical unit without economizer con
trol, only 4000 cfm of the 5000 cfm needed for
cooling requires mechanical cooling, since the

1000 cfm of ventilation air is already cooled. Of

the other 5000 cfm, 4000 cfm is return air and is

neutral, and 1000 cfm is ventilation air to be
heated. In the final analysis, it must be determined
if it is more economical to heat 4000 cfm from

55 F to 75 F, or to cool it from 75 F to 55 F. The
answer depends on the efficiency of the cooling
and heating source.

An example of economizer economics is illus

trated in Fig. 17. The graph plots percent cooling

load versus relative energy cost (electricity to gas)

and is based on the following typical assumptions:
48MA028 — 10,000 cfm, 15% outdoor air

48 F outdoor changeover temperature

75 F room design
55 F supply air temperature

Compressor changeover point (COP.)

of 3.3 (100 F condensing temperature
and unloaded compressor were used
to obtain this value)

The relative cost figures are in $/Btu input for

gas and $/kwh electric cost converted to Btu.
Example:

$.10/100,000 Btu (input) - gas cost
$.015/kwh - electric cost

Convert electric cost-

$.015/kwh X kwh/3413 Btu x |q5qqq

= $.44/100,000 Btu

Cost Ratio:

$.44/100,000 Btu _ , ,

.10/100,000 Btu

Therefore, if cooling load is less than 45%
(from graph) at the changeover temperature, the
economizer is uneconomical for 48MA units.

For 50ME electric heat units, the cooling load

break-even point is 70%; the internal load must be

greater than 70% to justify economizer control.

Fig. 17 — 48MA/50ME Economizer

Break-Even Point

15

The cooling load for this comparison is the
internal load (lights and people) minus the negative
transmission at the changeover temperature (48 F).

To determine the percent cooling load, compare

this value to the unit design cooling capacity.

Night Setback — Niglit setback control can be

added to a 48MA/50ME unit using field-supplied
components. There are 3 sets of terminals on the
accessory section of the unit zone control board
(see Fig. 18). The terminals are used in combina
tion to achieve the system desired. Terminal sets
are: cooling lockout (CL), night setback (NS) and
“Short To Close Dampers.” Red jumpers are

factory wired across CL and NS; “Short To Close
Dampers” are bare (see Fig. 19). If the circuit
between CL terminals is broken, 115-v power to
the compressor control circuit liquid line solenoids
and economizer thermostat (if used) is shut off. If

the circuit between NS terminals is broken, 115-v
power to the zone control transformers is shut off.
By replacing both jumpers with appropriate
switches and connecting proper switch across
“Short To Close Dampers,” NS control is attained.
Although many versions of NS are possible, the 3
most common methods are detailed here.

METHOD NO. 1 - HEATING NIGHT SETBACK,
COOLING LOCKED OUT, AND CONTINUOUS
INDOOR EAN OPERATION

This automatic NS system requires a Honeywell

S659A seven-day timer, a Honeywell R8227B fan
center (night setback relay) and a Honeywell
T822D thermostat (heating type) 24-v service. In

this system (see Eig. 20), when the timer reaches

the “Night” position, the switches are as shown.
CL opens, dampers close and NS opens. The fan

continues to operate.

As the temperature falls, the NS thermostat
located in the average temperature space energizes
the NS relay (fan center) which in turn energizes
the zone control transformers. The individual
zones then heat until the NS thermostat is satis
fied. The dampers remain closed and cooling is still
locked out. If a day/niglrt switch is used, the NS
thermostat is overridden and heating is controlled
by the normal thermostats.

Accessory remote panel assembly and/or ac
cessory economizer may be used with this system
if desired. Cycling indoor fans with NS thermostat
is possible if the accessory remote panel is not
used. Connect the field wiring to the MU terminals
instead of the NS and the indoor fan contactor will
cycle with the heaters. Although this system does
not provide a time off delay for the fans after
heater shutdown, test experience indicates that this
is not a problem on these units.

METHOD NO. 2 - HEATING NIGHT SETBACK,
COOLING LOCKED OUT AND CYCLING IN
DOOR EANS

This system requires a Carrier remote control panel

assembly 48MA900041, Honeywell S659A seven­day timer, Honeywell R8227B fan center (night
setback relay) and a Honeywell T822C thermostat

(cooling type).

The number of candidate systems for NS

increases with the use of the remote accessory
panel. A typical system is shown in Eig. 21. The
use of the master unit relay (MUR) and the master
cooling relay (MCR) requires 24-v wiring only.
Installing the timer and the NS relay in proximity
to the remote control panel results in all wiring
being located inside the building in one area.

16

LEGEND

1

AB — Accessory Board
AFS - AirfI ow Switch
APS — Air Pressure Switch
C — Compressor Contactor
Cap. — Capacitor
CB — Circuit Breaker
CCB — Compressor Circuit Breaker
CCP — Capacity Control Pressurestat
CH — Crankcase Heater

CHR — Crankcase Heater Relay

CL — Switch, Cooling Lockout
CO — Convenience Outlet

Compr — Compressor
CR — Cooling Relay
DLT — Discharge Line Thermostat
ECR — Economizer Relay
ECT — Economizer Thermostat
EXR — Exhaust Relay
FCB — Fan Circuit Breaker
FCPS — Fan Cycling Pressurestat
FL — Fusible Link
FRS — Filter Media Runout Switch
Fu — Fuse
GV - Gas Valve
Gnd — Ground
HA — Heat Anticipator
HC — Heater Contactor

— High Pressure Switch

HPS

— Holding Relay

HR

— Heater

Htr

— Ignitor

I

— Indoor Fan Contactor

IFC

— Indoor Fan Circuit Breaker

I FCB

— Indoor Fan Motor

IFM

— Internal Protector

IP

— Low Ambient Thermostat

LAT

— Liquid Line Solenoid

LLS

— Low-Pressure Switch

LPS

— Limit Switch

LS
MCR

— Master Cooling Relay

(MC)

MHR

— Master Heating Relay

(MH)
MUR

— Master Unit Relay

(MU)

— Normally Closed

IM.C.

— Normally Open

N.O.

— Night Setback Switch

NS

— Outdoor Air Thermostat

OAT.

— Outdoor Fan Contactor

OFC

— Outdoor Fan Circuit Breaker

OFCB

— Outdoor Fan Motor

OFM

— Plug

Pig

— Resistor

R

RB

Sw
TB
TC
TH
TM
T ran

ZB

' o

□□ s

□

o

A

Relay Board

Switch

Terminal Block

Thermostat, Cooling
Thermostat, Heating
Timer Motor
Transformer
Zone Board

Receptacle

<

Plug

Terminal Block

Terminal (marked)

Terminal (unmarked)

Circuit Board Terminal

Splice

Terminal, Circuit Board,

Factory Connected

Terminal, Circuit Board,

Field or Accessory
Factory Wiring
Accessory or Field Wiring

Circuit Board Run

To indicate common potential only, not to
indicate wire.

C2-2

OFCI
L2 ZB
L2 *B

-----------

1

——lF=------------------- --- ---

1

1

1

1

----------­——|F=

1

---------------II

aSlL---- -------------­9 41^ 7

3C*S»i

aSUi

-----------------

-------------------------

^CRI,

-----------------

LLS7

LLS6

LLS9

LLS4

LLS3

LLS*

LLSI

Fig. 19 — Unit As Shipped From The Factory

TO ZONE CONTBOL

SCHEMATIC

Ills zb (• zone only)

In this system, the MUR is energized by the NS
controls. This opens a set of normally closed
contacts and shuts down the unit, including indoor

fans. The outdoor air dampers are also closed by
the MUR. Cooling lockout is attained by energizing
the MCR. Energizing these relays turns the unit off
and the NS system seems to work in reverse.

A cooling thermostat is used on heating NS.
When temperature rises, the thermostat, in series

with the night switch, energizes the NS relay. Its
contacts close and, in series with the time clock
contacts, energize the MUR. As the space tempera
ture lowers to the NS setting, the NS thermostat
de-energizes the NS relay which de-energizes the
MUR, turning on the unit.

Again the day/night switch overrides the NS

clock and heating can occur because the NS relay is
de-energized. The factory jumpers remain across
CL and NS terminals.

note: 24V WIRING

BETWEEN CONTROLS

*CONNECT HERE INSTEAD OF NS

TO CYCLE INDOOR FANS

CL — Cooling Lockout
MUR — Master Unit Relay
NS — Night Setback

Fig. 20 — Night Setback, Method #1

SWITCHES SHOWN IN NIGHT POSITION,

rT? m n? m

I A I 1A| I A I I A|

DAY/NIGHT SWITCH

II5V
FIELD
SOURCE

LEGEND

APS — Air Pressure Switch

FRS — Filter Media Runout

Switch

MCR — Master Cooling Relay
MHR — Master Heating Relay
MUR — Master Unit Relay

c=iOR(^ Terminal (Circuit Board,

Field or Accessory Conn )

-------------

Accessory or Field Wiring

-------------- Factory Wiring

------

-------

Circuit Board Run

NIGHT SETBACK
THERMOSTAT (COOLING TYPE)

, I

--------

T~1

i cb

HI H2

REMOVE JUMPERS BETWEEN
NC AND R: C AND W

Fig. 21 — Night Setback, Method #2

ACCESSORY BOARD

ON BASE UNIT

This system opens the dampers when the
indoor fans start. To keep them closed, short
across the W-R terminals on the remote control
panel or the “Short To Close Dampers” terminals
during the NS period.

METHOD NO. 3 -- USING ACCESSORY RE
MOTE PANEL, HEATING AND COOLING
NIGHT SETBACK AND INDOOR FAN CYCLING

This system requires a:

Carrier remote control panel assembly

48MA900041

Carrier heating and cooling thermostat

HH07AT074

Carrier subbase HH93AZ070

Night setback relay (Honeywell fan center

R8227A)
Seven-day timer (Honeywell S659A)

The system (Fig. 22) is a proposed heating and

cooling niglrt setback with fan cycling. The
thermostat is a standard Carrier part with no
switches on the subbase. This requires a NS relay
with normally closed contacts so an alternate,
Honeywell R8227A is required.

Because cooling is not locked out, the clock
switches that close at niglit are used to directly
close the outdoor air dampers by connecting across
R and W on the remote panel accessory. Again the
MUR shuts down the unit (including the indoor
fans). When the NS thermostats reach their set
tings, the NS relay is energized, opening the NC
contacts and de-energizing the MUR.

However, if a “wild” zone exists, it is allowed
to cool on heating NS or vice versa. This may be an
advantage on some applications between zones.

Again when the day/night is switched to
“Day,” the NS is overridden and the unit operates
normally except the dampers remain closed at
night.

SWITCHES SHOWN IN NIGHT POSITION,

LEGEND

APS — Air Pressure Switch

FRS — Filter Media Runout

MCR — Master Cooling Relay
MHR — Master Heating Relay
MUR — Mastei Unit Relay
TC — Thermostat, Cooling
TH — Thermostat, Heating

c=.OR® Terminal (Circuit Board,

_______

________

Switch

Field or Accessory Conn )

Accessory or Field Wiring

Factory Wiring

' Circuit Board Run

NIGHT SETBACK
RELAY

FILTER

V 'T "V

<3F-ri-]-i-g

NOTE: 24V WIRING

BETWEEN CONTROLS

XI

. .¿XI c 3x2

TO REMOTE PANEL

MHR .

=*=o4

MUR I MUR I

-0==j=O=I

MCR |_MCRj I

O) SHORT TO HI H2
^ CLOSE DAMPERS

l2j lI_i

0

REMOVE JUMPERS
BETWEEN NC ANDR; CANDW

Fig. 22 — Night Setback, Method #3

18

ACCESSORY BOARD

ON BASE UNIT

#

Again, 2 jumper wires have to be removed from
the back of the remote panel to isolate the
day/night switch.

MORNING START-UP — To conserve energy and
lower total operating costs, the outdoor dampers
may be closed when starting the system in the
morning. During a warm-up period, when the
system is operated for one or two hours before
occupancy, only building return air should be
heated. The extra load of cold outdoor air intro
duced uses extra heat energy. Ventilation is
unnecessary until space is occupied, so the air
introduced produces unnecessary heat waste.

The same principle holds true on a cooling day,
when outside air transmits heat and moisture to
the evaporator coil. This extra load above the
return air only load is an unnecessary expense.

This can be offset by wiring a heating or
cooling thermostat across the “Short To Close
Dampers” terminals on the zone control board.

The thermostat senses return air temperature and

the outdoor air damper does not open until the
building is at the required temperature.

A time clock can also be used and set as
follows:

1. Occupied cycle: 8 a.m. to 6 p.m. Outdoor air
damper is open and the system is controlled by
individual zone thermostats.

2. Night setback cycle: 6 p.m. to 6 a.m. Individual
zone thermostats are on night setback (NS)
cycle. The outdoor air damper is closed, the
unit is reset down and controlled by NS
thermostat.

3. Warm-up (or cool-down) cycle: 6 a.m. to 8 a.m.
Outside air damper is closed by time clock and
the system is controlled by indoor zone
thermostats.

Using any method, increased economy is

achieved and building requirements are satisfied.

MISCELLANEOUS

Sound and Vibration — All roof mounted air

conditioning equipment produces sound and vibra
tion. On light types of roof construction, sound
and vibration may be transmitted directly to the
occupied space. Accordingly, sound attenuation
and vibration isolation are important design con
siderations on any rooftop application.

Sound attenuation can be accomplished in

many ways depending on the specific design
construction of the building. Roof mounted units
can be located over unoccupied space (i.e. storage
areas, utility rooms, corridors) where slightly
higher sound levels are not objectionable. Supply
and return duct systems can be acoustically lined
to prevent sound transmission into occupied space.
If open plenum return air systems are used, an
acoustical trap or fiberglass-lined chamber can be

used to attenuate the sound. Simple return duct

elbows and tees with 5-ft minimum fiberglass lined
legs and low static pressure drop should be
considered when using open plenum return air

systems. Figure 23 illustrates a procedure for

forming an acoustical trap using the roof curb area
under a 48MA unit.

NOTES:

1 Dimension A is approximately 7 in for optimum performance
2 Acoustical lining is 1-in 1-lb density, neoprene-coated fiberglass
3 Return air grille should be located at least 15 ft from return air opening

Fig. 23 — Acoustical Trap Installation

19

Roof mounted air conditioning equipment
usually has adequate vibration isolation of internal
components. However, light roof construction or
equipment location displaced from main roof
supports may dictate additional isolation to elimi
nate vibration.

Special vibration isolating bases and curbs
designed for rooftop applications are available
from some vibration isolator manufacturers. This
equipment virtually eliminates vibration trans

mission on critical applications. However, care

should be exercised when selecting this equipment
for use with a multizone. The design and installa
tion of vibration rails on a Carrier 48MA/50ME
should ensure that the interfacing of the vibration
isolator and the curb maintain watertight integrity.

Thermostat Usage and Control

USAGE - The thermostats used with the 48MA/

SOME units are either a 2-step heat/l-step cool or
2-step heat/2-step cool. A single module can have
only one step of cooling, but can have 2 steps of

heating. When 2 or more modules are grouped

together, the 2-step heat/2-step cool thermostat
can be used. Modules are grouped together by the
installation of factory-supplied jumpers on the unit
zone control board.

The thermostats are automatic changeover with

a 3 F dead spot between heating and cooling.
There is a 1°F differential between the first and
second steps of heating or cooling. Two subbases
are available for use with the thermostats; one with
off-heat-auto.-cool switch and one without
switches for tamper-proof installation. The tamper
proof subbase has provisions for locking the
thermostat cover and temperature selectors.

CONTROL - The thermostat field wiring connec
tions are made at the screw-type terminals on the
printed circuit board near the heating end of the
unit. This is commonly called the zone control
board. (See Fig. 24.)

Each module has the following thermostat

terminals: R (24-v power supply), Y (for cooling),
W1 (first step heating) and W2 (second step
heating). Pairs of modules are combined to form
nests: 1 and 2; 3 and 4; 5 and 6; etc. Each nest

forms National Electrical Code (NEC) Class II

circuit powered by its own 40 va transformer. Each

transformer is basically limited in capacity to

operate only the relays within its nest. Therefore,

contacts are provided in the relays to transfer the

signal to another module in an adjacent nest.

By correctly installing jumpers on zone control
board terminals, the contacts from a relay in one
nest power a relay in the adjacent nest using the
transformer of the adjacent nest. This technique is
known as multiplexing.

Same Nest Ganging - Figure 25 shows 2 modules
(1 and 2) of the same nest ganged together to form

a 2-module zone. Field jumpers are installed on
same lettered terminals to energize both control
relays simultaneously for cooling or first- and ^

second-stage heating relays or gas valves for
heating.

Figure 26 is similar to Fig. 25 except a 2-step
cooling thermostat independently powers the Y
connections for 2-step cooling in one zone. These 2
examples have not left the particular nest, so no
multiplexing has been done.

Adjacent Nest Ganging — Figure 27 shows 2
modules (2 and 3) of adjacent nests ganged
together in one zone so multiplexing is in effect.
Module 1 is in a zone of its own. When CR2 is
energized by the cooling thermostat, terminal 6 is
powered thru CR2 contacts 1 and 3 by the
transformer of the second nest. Then terminal 6 is

jumpered to 1 and CR3 is energized. Thus, on a

call for cooling, modules 2 and 3 are energized
simultaneously. The same principles and pro
cedures are followed for the first and second steps
of heating.

Multiple Ganging — Figures 28 thru 31 are further
examples of ganging and multiplexing zones to
provide 2, 3 or 4 modules per zone. These typical
examples demonstrate the principles of multi
plexing. The same procedures are followed for the ^
remainder of the zones on the unit. Many more ^
combinations are possible. Do not overload a

transformer by powering more than one relay of a
different nest in additon to the relays in its own
nest.

Multiplexing is done from top to bottom of the

zone control board . . . from module 2 to 3 and 4,

from 4 to 5 and 6, and from 6 to 7 and 8. The
contacts of one module are powered by the nest of
the next higher numbered module (see Fig. 24).

Return Air Systems

If the ceiling plenum on a top floor is used as a
return air plenum, the return air is heated from the
time it leaves the room and enters the unit. This is
due to roof load or if heat from lighting is added to
the plenum.

When considering the top floor, the roof load
does not raise the return air temperature signifi
cantly and, therefore, its effect is considered
negligible when selecting a unit.

Return air light troffers, however, can add
considerable heat to the return air. Using a
48MA/50ME unit with a return air light troffer
system can impose various design problems since
the purpose of the system is to reduce the supply A
cfm to the space by reducing the space load. With ^
the 48MA/50ME this may result in a very low

20

supply cfm — much lower than the unit was
designed for. If the supply cfm is raised to satisfy
the unit, the purpose of the return air light troffers

is defeated. As a general rule, a return air tempera

ture rise of 5 to 10 F does not cause a problem,
and special ratings can be made available.

In addition, when the supply cfm is reduced, as

above, the outdoor air quantity remains constant.

This results in a higher than normal percentage of

outdoor air which the 48MA/50ME unit may not

be capable of introducing. For return air light

troffer systems, exercise care when using the light

manufacturers’ data concerning the amount of heat

actually returned to the unit because with the

higher return air temperature, a portion of the heat
is transmitted back to the space thru the ceiling.

21

fR Q-Q MODULE I NEAR SIDE

r O

0

0 o

0

HR2-I

0 0 0

0 0 o

HR3-I

,. CR3

, GV5

0

0 0

0

HR4-I

O 0 o

0 o o

HR5-I

0

O 0

0

HR«-I

wi O—a

[Y

X

'"CW

Y O-io

w*0^

o o o

0 o 0

HR 7-1

o

O 0

o -2

HR8-I

O O 0

0 o O

HCI

HC2

HCZ

HC3

HC3

HC4

HC4

HC5

HC9

HC6

HC6

HC8

-2

•2

-2

-2

-1

•2

*■

0 0 o

0 o o

HR2-2

0 0 o

o o

o o 0

HR3-2

0 0 0

0 O 0

HR4-2

0 0 o

0 o

0 O 0

HR5-2

O O 0

o o o

HR6-2

0 0 0

o o

O o 0

HR7-2

0 O 0

o o o

HR8-2

0 O 0

O 0

0 0 0

CR!

0 o o

o o

0 o o

D O O

O O

0 o o

CR2
CR3

o o o

o o

o o o

0 o o

o o

0 o o

CR4
CRB

0 0 0

o o

o o o

0 o o

o o

o o o

CR6
CRT

o o o

o o

o o o
o o o

o o

0 o o

CR8

«(>o

Y

E L 3„„,

, ,CR?^

,(>^

■ a

'O

lo

0

0

0 o 0

0 O 0

0

0

0 0 o

3 0 0

HR99M

0 0

HRI0,i2-l

HR9.1M

0 0

HRI0.I2-I

HC9

HCII

-1

HC9
HCM

-2

HCIO
HCI2

HCIO
HCI2

HC9
HCII

-1

HC9
HCII

-2

*•

HCIO

-2

IIUU

HR9. I|.2

0 0 o

0 0 0

HRIO,t2-2

0 0 o

0 o

0 o o

HR9,11-2

0 0 0

0 0 0

HR 10.12-2

0 0 0

0 o

0 0 o

HC9

H^ll

LLS9
LLSII

tU'i

Hao
HCI2

-3

CRIO.IS

HC9 CR9.M

HCllI——

|o O o

O O

(boo

O o o

tH,a

O O

HOO

0 0 0

HCI2

ClflO.IZ '

L2

NOTE: See Fig 19 for legend

Fig. 24 — Zone Control Board

22

ANTICIPATOR

SETTINGS

LEGEND

CR — Control Relay
GV — Gas Valve
HA — Heat Anticipator
HR — Heating Relay
TC — Thermostat, Cooling
TH — Thermostat, Heating
Tran ~ Transformer

Q) Screw Terminal

I

----

1 Quick-Connect Terminal

-----------

Factory Control Wires

rrr-- ; Printed Circuit

.

---------

Field Wiring

Fig. 25 — Two-Stage Heat, One-State Cool — Same Nest

23

LEGEND

CR — Control Relay
GV — Gas Valve
HA — Heat Anticipator
HR — Heating Relay
TC — Thermostat, Cooling
TH — Thermostat, Heating
Tran — Transformer

0 Screw Terminal

Quick-Connect Terminal
Factory Control Wires
Printed Circuit
Field Wiring

Fig. 26 - Two-Stage Heat, Two-Stage Cool - Same IMest

24

#

LEGEND

CR — Control Relay

GV — Gas Valve

HA — Heat Anticipator

HR — Heating Relay
TC — Thermostat, Cooling
TH — Thermostat, Heating
Tran — Transformer

0 Screw Terminal

1

----------

1 Quick-Connect Terminal

--------------

Factory Control Wires

-------

— Printed Circuit

---------

Field Wiring

Fig. 27 - Two-Stage Heat, One-Stage Cool - Adjacent IMest

25

LEGEND

CR — Control Rela^
GV — Gas Valve
HA — Heat Anticipator

HR — Heating Relay
TC — Thermostat, Cooling
TH — Thermostat, Heating
Tran — Transformer

Screw Terminal

0

Quick-Connect Terminal

Factory Control Wires

Printed Circuit

_______

Field Wiring

Fig. 28 - Two-Stage Heat, One-Stage Cool - 3 Modules Per Zone

26

LEGEND

CR — Control Relay
GV “ Gas Valve
HA — Heat Anticipator
HR — Heating Relay
TC — Thermostat, Cooling
TH — Thermostat, Heating
Tran — Transformer

0 Screw Terminal

Quick-Connect Terminal

Factory Control Wires

Printed Circuit

---------

Field Wiring

Fig. 29 — Two-Stage Heat, One-Stage Cool — 4 Modules Per Zone

27

LEGEND

CR — Control Relay
GV — Gas Valve
HA — Heat Anticipator
HR — Heating Relay
TC — Thermostat, Cooling
TH — Thermostat, Heating
Tran — Transformer

0 Screw Terminal

Quick-Connect Terminal

—- Factory Control Wiies

Printed Circuit

— Field Wiring

Fig. 30 — Two-Stage Heat, Two-Stage Cool — 4 Modules Per Zone

28

i

ANTICIPATOR

SETTINGS

HAI

.13

HA2

.57

NOTE:

COOLING

Stage 1 — Module 3
Stage 2 — Module 2 & 4

If thermostat wires are interchanged,

the reverse may be obtained

HEATING

Stage 1 — First Stage of Modules 2,3 & 4
Stage 2 — Second Stage of Modules 2,3 & 4

LEGEND

CR - Control Relay
GV -

HA -

HR ­TC - Thermostat, Cooling
TH ­Tran —

Gas Valve
Heat Anticipator

Heating Relay

Thermostat, Heating
T ransformer

Screw Terminal

0

Quick-Connect Terminal

czn

Factory Control Wires

Printed Circuit

_____

Field Wiring

Fig. 31 — Two-Stage Heat, Two-Stage Cool — 3 Modules Per Zone

29

PERFORMANCE DATA

Room Design 75 F/50% Rh

COOLING CAPACITIES

48MA/50ME016

OUTDOOR

AlP

TEMP

Db

Wb TC SHC

65 168 118

8 j

70
65 164 116 15 4 169 129 15 7

70 164
73 164 116
75

65 160
70 160

95 75 160

78 160
80

70 156 112 16 5

100 75

78 156 112 16 : 171 120
70 152

105

75 152 110 17 0 164 125

no 78

115 75

OUTDOOR

TEMP

Wb

Db

65

85

70

65

70 200 141 18 8 212 151
73
75

65
70

95

75
78
80

70

100

75
78

'70

105

75

no 78

115 75

0

K w

14 8 174 l26 Is i

168 118

164

160

156 112

14 8

116 15 4 173

15 4

1 16 15 4
114

16 0 165 131

114

16 0 169 126 16 4
114 16 0 173 121
114 16 0
114

16 0

16 5

no 17 C 160 130

109 is 5! 161 124 18 5 171

148
144 107

TC SHC

20.1
204

200 141 18 8 208 155 19 ; 212

200 1 11
200

196
1 96 140 19 5 207 153 20 2
196 140
196 1 10 19 5
196 140 19 5 216 143

T9T 137

19?

192

[187 135

187 135 20 9

178

18 C

0 750 1500

K w

143 18 0 212 153 18 5
143 18 C 217

18 8

141

18 8
19 5

140^

19 5

2Q r-

137

20 2 207 150 21 2

137 20 2 209 147 21 4 221

20 9

iTT 21 6
fsT

22 3

TOTAL UNIT CFM

4,000

Outdoor A r Cfm

750

TC SHC

178

176 121 16 0 183 125
177 119 16 i 186 121

175 118
177 1 16 16 0

164

168

155

Outdoor A

TC SHC

215 148
216 146 19 7 227 148 20 3 210 159 19 3 225 164 20 2

203

212 148 20 5 222

214

202 155

197 157'

201 152 21 9 211

199 150 22 8
i9T 155 23 3

K w

122 15.3

124

15 9

16 2 168

16 6 182 127 17 1 167 126 16 3 178 133
16 8

17 C 170 143 17 3

128

17 2 177 133 17 7

123

17 4 181 127 18 0
17 5 165

17 8 172

Too 18 8 162

5,6o6

r Cfm

K w

149

18 ■

19 5 219
19 6

157 19 9 208 l73 20 2

145 20 6

20 8 230 144
20 ijH

no" ToT 176

1500

K w TC SHC

SHC

TC

134

177
184 124

172 140
179 131

174 137 16 7 167 126 16 3 175

186
189

TC SHC

216 161
224

224

214 164

227

20T
216

15 2
15 6 176

15.8 171
16 2 171 128 15 8 179
16 4
16 5 171

146 16 4 167 126 fl6 3 172

17 4 167 126 16 3 180 130 17 1 190 133 17 6 172 138

121

17 5 167

116

149 17 9 158
139

18 3 158

139 19 ■

19 •;

152

K w TC SHC Kw

18 7 215 161 18 6 222 171 19 0 226 179 19 2 222 178 19 0 229 188

19 ■ 215

152
167 19 4

19 9 210

158
152 20 1

20 6 206 157 20 1 216 171 20 7 222 182 21 1

154

21 1

148 21 4

21 6

ITCT 21 3 20 r
160 21 8
154

22 1
22 i

166

22 6

210 166 23 6

'178' 240

6

Kw

130

176

171 128 15 8 182 133 16 3

163
163 124 16 9 173 136
163 124

154
140 1 19 18 4 159 142 19 1

210

210

206

206 157 20 1
206 157 20 1
206 157 20 1 224 160 21 2 236 162 21 9 212

201 155 20 8
201 155 20 8 217 164 21 9 227 172 22 5

196

196 153 21 5 209 169 22 4 217 184
191 151 22 2 206

186 149 22 9 198 173 23 8 206"

15 2 181 139 15 4 184' 146 15 6 181

130

15.2
15 S 176 141 16 0 179 152 16 2 176 140

128

15 8

128

126 16 3
124 16 9

16 0

123 17 4

17 4

123
121 17 9

0

161

18 6 226 167 19 2 233 170 19 5 222 178 19 0

159

19 3 218 173

159

19 3 221 169

159

19 3

1 57 20 1 213 i'75 '20 5 217

20 8 i

T55"

TsF '21 5 20T 174 22 2

5,000

Dutdoor A r Cfm

750

TC SHC

184

134 15.6

16 2

136

183 131

182

170

175 132 17 6

165 143

168 138 18 1 175 152 18 5
166 137 18 7 - - - 158

TOTAL UNIT CFM

)utdoor Air Cfm

TC SHC

223

220
222

2rr
214

16 4 191
16 6 r74l

143

16 8

138

16 9

128 17,2 - - -

141 17 3

17 5 181

17 9

6,500

750

19 8
20 0

166

20 1 231

166

21 0

163 21 1

J7T 21 5' T88

21 / 223 178 22 2

168

23 3

168

1500 0

TC SHC

Kw

190

185 143
188

180
186 139 17 4 172 138

175

- -

170

Kw

TC SHC

222 185 20 0 217
227 176 20 3 217

234

229 172 21 5 212
233

2^2

215

Kw

15.9

137

16 4 176 140

137 16 6

16 8 176 140

133

16 7 172 n38

'■"158"

149 17 0 172 138

155 17 6 167

146 17 9 167

162

18 2

1500

Kw

170 20 6 217
166 20 7 217

.....

20 8 212

166 21 7 212

U., g..

iW InT' 202

23 0 202

184 24 0

24 4 191

195

6,000

Outdoor Air Cfm

750 1500

SHC Kw

TC

142 15 4'^
142 15.4 189

181

176

140

172 138

M36 17 2

136 17 2

167 136

134 17 7 169

162

134 17 7 172 149 18 3

162

132 18 2
130 18 7

153

-

6 750 isoo'

TC SHC

17'6 19 7
176 19 7 227 185 20 3 233 193 20 6
176 19 7 229 182 20 4 237 187 20 8
176 19 7 231 181 20 5 239 183 21 0

174 20 5 219
174

212

174
174 20 5 228
174 20 5 229 177 21 5

207 172 21 2
207 172 21 2
207 172 21 2 222 181

169
169

197 167 22 6

165 23 3

TC SHC

h§6

150 15 7 188
146

16 0 181 152 16 3 183 164 16 4
16 0 184
16 0 186 145 16 5 192 149 16 8
16 0 187 143 16 6 194

16 6 176 155
16 6 179 150 17 0 183
16 6
16 6 184 142
16 6 185 140

17 2

Kw TC SHC

20 5 222
20 5

21 9 nn T9T 22T ziT 210
21 9

148

182 145

174

152 17 5 178
177 147 17 7
179 144 17 8

154

169

148

153 19 3

162

8,000

Outdoor Air Cfm

232 183 19 5 239 187 19 9

224 190 20 1

...
187

225 182 21 3 233 189

179

'216 189 '21'8 222 204 22 2
220 184 22 0 227 195 22 5

214

186 22 8

210 185 23 6 - ­202 189

Kw

TC

SHC Kw

158 15 8

194 149 16.1

15.8

16 4

16.8

17 1
17 2
17 3

18 1

18 9

155 16 6

189

145

178 170 17 0

161 17 2

189 151 17 5

_

-

- - -
167

- -

- -

H73 173 18 4

„

-

- - -

- - -

48MA/50ME024

Kw

TC SHC

19 4 233 196 19 6

202 20 4

228

20 9 223 207 21 2
21 1 227

21 4

22 2

24 1

199

21 4
21 8

- -

- - -

- - -

22 9''

221 201 23 3

- -

16 9

17 8

Kw

*

-

_
„

-

OUTDOOR

AIR

TEMP

Db

Wb

65 265 190 24: 275 203 24 6 280 213

85

70
65 259 188

70

90

73
75

65 254
70

95 75 254 185

78 254
80 254

70

100 75

78
70

105

75 242 180

no

IT

115 75

Kw — Compressor Motor Power Input
SHC — Sensible Heat Capacity (1000 Btuh)
TC - Total Capacity (1000 Btuh)

SHC

TC

265 190

259 188
259
259

254

248
248
248

242 180

zT

T77

230

1 . , —

0

K W

24 0
24 9 269 206 25 5 273 221 25 7 271 210 25 6 280 229'”’ 26 i 284 244 26 3

24 9 274
24 9

188

24 5 279

188
185 25 8

185 25 8

25 8
185 25 8
185 25 8

182 26 7
182 26 :
182 26.7 269

27 6 254

27 6 259

W4

174

29 2

/ (Mil

Outdoor Air Ctm Outdoor Air Ctm

1000 2000

TC SHC

197 24 8 289 201 25 3 277 213 24 6 291

280

200 25 8

277 196 25 9 287 201 26 5

193

262

208
267 202 26 7 275
273 196 27 0
276 192 27 2 290 196 28 0
279 189 27

261 205

266

198
194

207
201

T?9

256"
246 206 30 4

___ -

K W

TC SHC

282 209

26 ' 291

267 229 26 6

26 4

284 204 27 7

294

127 0

268

27 9 277 212 28 6 258

283

28 1

261

28 ■;
28 8 270

29 9'

268
256 236 31 2

--

K w

24 ? 277

26 2 271

196 26 7 271

217 27 -

190 28 3

225 28 0 258

203 29.0 258

237

28 9

220 29 5 252 202 28 3 267

219 30 8 W: 199'

L,— 1 __ L. . — . . 1

TOTAL UNIT CFM

9.000 11.000

0

TC SHC

271

264^
264
264
264
264

252 202 28 3 263

239 197

K W

24 6

213

210 25 6

25 6 287

210
210 25 6 289 216 26 6 299 219

26 5

208

26 5

208

26 5

208

26 5 285 214 27 7 297 219 28 4 272

208

26 5 287

208

27 4

205
205 27 4
205 27 4

29 1
29 n253 229 31 C

NOTES: 1. No values are given where unit cannot maintain the assumed room

1000 2000 0

TC sttc K w

287 226

284

273 231
277
282 219 27 5 292

270 ’
275
277 217

263” 222 3CT

25 2

220

25 -

223 26 3
219 26 5 296 225 27 0

27 6 277
27 3 284

225

27 8

212
228 28 2 276 248 28 6 265

221 28 5 284 235 29 1 265

28 6
29 0 269 255 29 5

230
224

29 3

design relative humidity since the moisture content of the air leaving
the unit is higher than the assumed room moisture content

2 Ratings are gross and do not include fan motor heat deduction.

30

....

TC SHC

291 236

224 25 8 285 234 25 1 298 242 25 8 305

298

291 232

252 27 2 272
240
227

- - -

- - - 265 226

243 30 0 258 223

276

-

258 31 7 245 218

262

Kw

TC SHC

25 4 285

26 7

27 2

27 7 272 229
28 1 272

234

232

278
278 232

232

278

232 26 0 295 238

278

229

229 26 9 288 240

229 26 9 291

229 26 9 292 233 28 2

272

226
226 27 8 280 243 28 8

223 28 7

258

251 221

48MA/50ME028

. .

-

Outdoor Air

1000

Kw TC SHC

294 248 25 6 298 258 25 8

25 1

26 0 287 250 26 5 291 266 26 7
26 0 291
26 0

26 9
26 9 284 247 27 7

27 8

27 8

28 7
29 6 268'
30 3

244 26 7
241

293

280 252

236

276' 249

239

283
269 252

273 245 29 7

243 30 8

258 250

_ - -

Cfm

Kw

26 9 302 246

27 0
27 4

27 9
28 1

28 6

29 0
29 5 274

31 4

2000

TC SHC

297

304 241
283 273

290

- - -

- - -

282

- -

- - -

- -

- - -

246 26.1

254 27 1

'262 28 0

- -

260

274 29 8

- -

- -

K w

27 3
27 5

27 6

28 9

t

L

PERFORMANCE DATA

Room Design 78 F/50% Rh

COOLING CAPACITIES

48MA/50ME016

OUTDOOR

AIR

TEMP

Db

85

90

95

100

105

no

115

AIR

TEMP

Db

Wb

85

90

95

100

105

.1.10

115

Sipop

0

TC

SHC

183

1 32

J83

Ш

131

178

131

178

131

178
178

13]

129

174

129

174

129

174

129

174

229

274

127

169

127

169
]6?

1?7
125

165

2 25

165

223

160

121

156

0 750 1500

TC SHC

220 158 18 9
220 158

216 156
216 156

156 19 7 228 163 20 4 235

216
216 156 19.7 230

154 20 4 217

21 •

154

21 1

154 20 4

211

154

211

154

211

206 152

152 21 2

206

206 152

150 21 9

201
201 150

148 22.6

196
191 146 23 .3 202

Outdoor Air^Cfm

750

Kw

15 5

15,5

16 1
16 1
16 1
16J

16 7
16 7
16 7
16 7

16.7
17 3

17 3

-17,3

17 8

1J.8

2 8,4_

18 9

Kw TC SHC

18.9
19 7

19 7 226 165 20 2

20 4

20 4

20.4 229 157 21.5
21 2 215

21.2

21.9

SHC

T£

186

141
]36,

L90
182

143

185

138

137

136
134

188
177

145

180

140

183

136

186

133

187

130
143

175
178

138
135,

J81

145

170

240

]73

139,

l'70
164

144

6,000 7,500

Outdoor Air Cfm Outdoor A

227 167 19 2 230 175

163 19.4 236

231

169 20 0 225

222

161 20.5 238 163
171

220 167 21 0

224 163 21 2 232

160 21 4

227

169
164 22 0

219

161 22 2 231

221

171

210

1 66 22.7

213
210 165 23.6

170 24 1 210 192 24 ^ 197

TOTAL UN IT CFM

. *7.',6,000”

Outdoor Air Cfm

IIPP.

Kw

,15

15 7

188

-!5,?,

l?i]

16 3

183

16 5

189

16 6

193

16.6

195
179

16 9

17 0

184

17 2

190

17 4

1 94
1_96

VIA

1~79

’l7 6

17 8

185
188

IL?.

174

18 2

179

18.4,
i,78

19.1

169

19 5

Kw

TC SHC

231 172 20 5 223 174 20 1

220 187 21 0 218 172 20 9 224

20 8

226

237
240 159 22.2 218 1 72 20.9

220

21 7

227

22 5 215

221 181 23.2 208 16^ 22,4 219 184 23 1
219

Kw

11?,

15 8

148

1 6,1

13?.

154

16 4
16 7

145

16 9

139

.17,0

1.35

17 0

160

17 3

151

141

17 6
17 7

135

17.8

J31,

1.57

17 8
18 2

148

.LM

Л11

163

18 4

154,

1§,8

1,54

1*9.5

166 19 9

К w

19 4

167 19.7
181 20 t 223 174

167

20 8 233

20.9

21 3

178
169

21 7 218 172 20 9

163 22 0 218 172 20 9 233 177 21 8

184

22 1 213 170 21 6 220
22 5 213 170 21 6

175
169 22 8 2^3 170

190

22 9 208

181 24.2 203 '65 23,'

P

TC

SHC

Kw

144

188

'.44

L§8

183

143

183

143

183

143

183

1.43

141

178

141

178

141

178

141

178

141

178
174

139

174

139

139

174
169

137

169

137

164,

1Ж

159

133

0

TC SHC

176 19 3

228
228 176 19.3

174
174

223

218 172 20 9 227 185 21 4

167

163

.TC,

157

15.-8
16 4
16 4

16 4
¡.?И

17 0
17 0

1 / 0

17 0

17.,0
17 5

17 5
!7,5

18 I

18.1

1,8,6

19*2

TOTAL UNIT CFM

К w

235 185
238 181

20 1 229 187

233 183

20 1 2.35 180 20 7

20.1 236

231

735 175

225
227 179 22 5

21 6

22 4

216 188

216 183

23 8 207 187

192
19,4

187
189
191

193,

182

184

187

189
l?i

179
182

18 !.
174
177

174
161

TC

75p

S.H.C

"1 б’о

153

J6.J.

148
155

150
1 48
146

157
152
148
145

2,42

155
150
147

157
152

152

15Г

r Cfm

750

SHC

19 6
'9.8

20 4
20 6 238

20.8

178
189 21 2

180 21 6

21.9

187 22 2
182 22 4

22 9

24,0
24 1

Jllw

16 5
16 7
16 8

16.9
17 1

17 3
17 4
17 6
172

17 9
18 0

18J.
18 4
18,6

19.3,
197”

К w TC SHC

SH_C

T_c

19~з'
198

188
193
196
]98

183
188
193

183
188

177
182

238
243

233

241 185 'H 1
244 181 21.2

228
232
238
242
244 176 22 1

227 202 22 5

232 193

236

22,
226

223 198

214 209 25 ■

1500

Kw

Тб 0

16.3,

1.51
16 6

166
157

16 9
17 0

151

^^.2

148

17 2

172

17 5

163
154

17 8

169

18 1
18 3

160

175

18 6

18.9

166

1500

К w

193 19 8
184 20,1

199

20 6

190 20 9

20 1 21 4

196 21 7

187 22 0

181 22 3

22 8

187 23 1

207 23 3
198 23 6

94.6.

TC

SHC

292

T56

,156,

192

154

187
187

154
154

187
187

154

182 152
182 152
182

152

182

152

182

152

17*7

150

177

150

,177

2,50,

172

148

172

148

]46

iV/

144

162

IC

£HC

334

192

234

192

229

190

190

229

190

229

190

229

188

223

188

223

188

223

188

223

188

223

186

218

186

218

186

218

184

213

21 3

18.£

207

J82,i

202

180

P

0

Outdoor Air

Kw

16 0

16.,0
16 6

16 6
16 6
16,6

17 1
17 1
17 1
17 1

,17 1

17 7
17 7
1,7^7

18 3
18П

18.8
19 4

Outdoor Air Cfm

Kw

J,C„

__

TTo

19,6

20 4
20 4
20 4

20 1

££2

21 2
21 2
21 2
21 .£

21'V

21 9
21 9

22 /

22 7_

23.
24 1

IC

195'

]98
190

193
194
196

185
188
190

192
193

18*2
185
Ш7,

177
170

17“

169

243

234
238
240
241

230
232
235
237

239

226
229
231

221

223
.2] 9^

21 1

7,000

Cfm

750

l£w

SHC

'l64'

16 T

160

16.3 Л02

16 7

166
162

16 9

159

16 9
17£

J5?

17 3

168
164

17 5
17 6

159
156

17 7
n 8

2 5£
'160'

18 0

161

18 2

2843

..IJi

168

18 6

163

18.8

*162

19'?

168

48MA/50ME024

9,000

***750

..........

Kw

SHC

202

198

20-1

204

20 7

200

20 9

197

21 0

21.1

195

£ 5

206

301

21 7

197

21 9

194

22 0

192

22 1

2*03

22 5

199

22 7

196

22 8

20.~

2ТЗ 2

2.3 1

201

199,

24.3

204

24 8

TC

197

192
196
199

201
186

191
195

185

180

TC

_4_.

248
238

242
246
24£

233
236

242

231
236

226

229

1500
SHC

171
163

177
169
163
1,59

184
175
165

181

180

jjpo

SHC

'210

201

21 5
207

202

198

221*

213

204

218
209

224
215

Kw

16 2

26.4,
16 8

17 0

17 2
17,,3_

17 4
17 6
17 9

18 2

18 8

jK w

20 Г

20,3
20 9

21 2

21 3
21 5

21 *8*

22 0

22 3

22 8

2i 1

23 6
23 8

.

OUTDOOR

AIR

TEMP

Db Wb,

'б5

85

70

65

70

90

73

75

65

70
75

95

78
80_

*70

100

75
78

70

105

75
78

.1.10

75

115

Kw — Compressor Motor Power Input

SHC — Sensible Heat Capacity (1000 Btuh)

0 1000 2000

SHC Kw TC SHC К w TC

TC

282 205
282 205

276
276 203 25 9 288 215 26 6
276 203
276 203 25.9 293 208

270 200
270 200
270 200
270 200
270 200 26.8

263 197 27 7
263 197
263

257
257

251

244 189

24 9

24.9 295

203 25 9 284 220 26 3

25 9

26 8
26 8
26 8
26 8

27 7

197 27,7 282
195 28 6

195 28.6 272
192 29.5 268

30 3

TC — Total Capacity (1000 Btuh)

8,000

Outdoor Air Cfm

290 218

JJTj

291 21 1 26 7 299

Yj~j

223 27 2 280
281 217 27 5 287 232 27 9 279
286

211
289 207
292 204

274

220
279

213

209 28.9 293 219
267 222 29 3

216

215
258 221

- " - -

-

SHC

294 227

25 4

25.6 302,

26,9 .303 211

27 8 295 219 28 4
28 0 301

28.1
28 4

28 7 288

29.7

30.7
31 4 266 251

216 26.0

287

235

294 224 26 9

216 27 2

243 27 4 279 223

211 28 7

304 205

239

280

227 29 3 272 220

273 247 29 7 265 217 29 2 275 245

28C 235

278

235

TOTAL UNIT CFM

10,000

0

К w

TC SHC Kw

25 6

292

228

292 ,2,28 25,4

26 5

285 225 26 4
285 225 26 4 297
285 225 26 4

27.4

285 225 26 4

223
279 223 27 3 294 234
279 223

28.9 279 223 27,3 299 227
272 220 28 ?

23 8

29. c 27: 220

217 29,2 279

265

30-2

31.5

32 0 25. 212 30 4

258

215 30.1

Outdoor Air Cfm

loop

TC SHC

25 4

300 241 25 9

23.5

304
293 243

238
234

299
301 231

27 3
27 3 289 240

27 3 297 230

28 3

28.3

NOTES: 1

246

285

243 28 9

282

236 29 2

286
289 232

23?
237

274

244

264

Я1

48MA/50ME028

12,000

Outdoor Air Cfm

2000

TC SHC

Kw

303 251 26 0
310

26.1
26 3 296 258

27

302 247 27 4

27 2

301

27.,4

310

27 8 288

295

28 0

302

28 3

306 234 29 0

28 4

28.;5,

- -

287
294

29,4

298

279 270 30 2

29 8

28':, 258

30.1

31 .2 - -

271 271 32 4

31 8

No values are given where unit cannot maintain the assumed room
design relative humidity since the moisture content of the air leaving
the unit is higher than the assumed room moisture content

Ratings are gross and do not include fan motor heat deduction

Kw

239

2.Л4
27 0

27 6

240
234 27.8

26g 27 9
255 28 3
242 28 7

29 1

262

29 7

250

3(3,0

242

30.6

0

SHC Kw

298
298

292
292
292
292

285
285

285

285

285
277

277
277

270

270

263

25 8 306

250

25 .„8

250
247 26 8

247

26 8 303 259 27 4
247 26 8 305 256 27 5
247

26.8

.

245 27 7 295
245 27 7 299 256

245 27 7 302 252

27.7

245
242 28 7

242

28 7
242 ,28.7

239 29 6 380 267 30 2 283 284

29.6 2,83 261 30.5 - -

23?,

30.4,

.23c_
*234

31 3

jppp 2000

Kw

.SHC

T£

3LQ

299

301 ,253 27.6

29“

.303

287 264 29 3
291
294„

278
268 266 *32 2

26 2 309

262

.25?

2AJ

265 27 2 302 280 27 3

267

28 1

262 28 3 300

28 6
28 7

28.,8

249.

258 39 5

29,7

.254

£59

.31j5

SHC Kw

.T£

272

.26,7 ,

261,

Л1.6

269 37 7

308
312 262 27 9
31,4

.257,

294

288 28 3
277

306 264 29 0

- -

284

29 3

- -

- -

- - -

- - -

26 4

28.0

28 6

29 6

30 5

PERFORMANCE DATA

Room Design 80 F/50% Rh

OUTDOOR

AIR

TEMP
Db

100

_

Wb

65

188 133 IS 8

70

jas

65 183 131
70

90

95 75 179

183

73

183 131

75

183 .131

65

179 130 17 0

70 179
78

179 130 17 0 189

80

J79 130

70 174
75 174
78

174

70 169 126
75 169 126

no

78 165 124

115 75 160

OUTDOOR

AIR

TEMP

Wb

рь

95

100

no

115 75

TC SHC Kw

227 159

65

227 159

70

222 157 20 0 227

65

222 157

70

222 157 20 0

73

222 157

75

217

65
70

217

75

217

78

217 155 20 8

80

217 155

70

212 153

75 212 153 21 6 224
78 212 153

70 207 151 22 3

207 151

75

202 149

78

197 147

__ (

0

TC

SHC Kw TC SHC Kw TC

133 15,8 194

16 4 186 143
16 4

131

16 4 191 136 16 8 196

16.4 192 134 16.8 198 136 17.1 188 144

130 17 0

17 0 187

130

17.0 191

128 17 5
128 17 5 182 139
128 17.5 184 136

18 1

18.1 177 141 18.6

18.7

19.2

122

0

19 2

19.2 236 164

20 0 231 166

20.0 235

155 20 8
155 20 8 225

155 20 8 229 164 21 5 237 170

20.8
21 6 220 170 22 1 224 185

21.6 226 163 22.5 235

22.3 218

23.0 215 166 23.9

23.7 207 171

5,000

or A

lutdc r Cfm C

750

141

191

189 139 16 7 192 146

181 145 17 1 182 160 17 1 183
184

179

174 145

174

15 9

16.1 197 139

J37

16 5

141 17 3 187 152 17 4 183
137 17 4 193 142 17 7 183
134

17 6 197 136 17 9 183

17.6 199 132

131J
143 17 5

18 0

18.1
18 4

140 19.3 180 155 19.7 168

167 145 19.7 172 167 20.' 164 134 19.5

6lQ00

Outd<

jor A

r Cftn

750

TC SHC Kw TC SHC Kw

232 168 19 5 234 176

233 164 20 6 239

222 172 21 1 225 187 21 3

232 161 21 7 241 164
234

215 172 22 8 219 191

19.7 241 167

170 20 3 229 182

20 5 235 173 20 8 229 175

162 20 7 242

168 21 3

159

21.8

166 22 3 231 176

167 23.1 225 182 23.5 214 169

24.5

TOTAL UNIT CFM

___6,000

)utdoor Air Cfm

146 16 0

193
193 146

144 16 6

188

144
144 16 6

0

TC

196

16.0 199
191

16 6

194
195

1500

192

148

16 0

16.2 1

Kw TC SHC К w

SHC

187 154 16 6

16 8 188

140 17 0 188

16.6 197 147

142
142
142
142

182

18.1 183

158 18 0 178
188 149 18 3 178 140 17 8 186
191 142 18.6 178 140

164

177
182

18 6 173 138 18 4 178

155 18.9 173 138

142

140 17 8

186

17 2
17 2

188
17 2 191
17 2 193 146

17.2 195

183 156

17.8 188 148

18.4

181 153

136 18.9 177

170

IOTA

1500

—

19 6

234
234

20.0
229

20 4

168 21 0 229 175 20 4
164

21 2 229 175 20 4

224

230 179

244 160

170 23.0 219 171 22.0

223 182
214

193

224

21 6

224

22 0

224

22 2

224

lJ2.4

219 171

22 3

219 171

22 7

23 1 214 169

24.5 208 167 23.5

.25,0 203 165

TC SHC

177 19 6
177 19.6

175 20 4

173 21 2
173 21 2

173 21 2
173 21 2

173 21.2 240

Outd

0

Kw

TC SHC

240 186 19 9
243 182 20.1

235 188 20 7

20 4 238

240 181 21 0 246 186
242 180 21 1

230 19(f 21 6
232 186 21 7 236 197
236 182 21 9 242 188
238 179 22 1 246

22 0 227
22 0

230 183 22 7 236 194
232 181 22.9

22 8 221 190 23 3 226 208

22.8 224
220

24.2 212 189 24.9

COOLING CAPACITIES

750

SHC

153 16 2
149 16.3

156 16 8
151 16 9
149 17 0 200 152 17 2 192 155

—

1500

Kw

TC SHC Kw TC SHC

197 160
202 152

192 167
197

158

17.1 202 149 17.3 192 155 16.8

17.3 186 173 17 4 187

158
153 17 5 191 164 17 7
149 17 7 196 155 17 9 187 153 17 4

17 8 199 149

144

151

_

17.8
186

18 1

191

18 2

18.4 194

170
161 18 5 182 151 18 0
155

158 18 7 180 176

18.8 185 167

152 19.5
157 19.9

к UN
7,50

ООГ A

750

184

177

188 22 5 231 203

185
184

_ _ _

175 175 20 2

IT CFM

P

ir Cfm

150( 0

Kw

TC SHC

194

242
248 185 20.3 240 194 19.9 249 199 20,4

237

20 9

22.2

23.5

24.3 227 200 24.9 213 184 23.8

200 20 9 235

191

242

248 182 21 5

233 205 21 7 229 190 21 5 235 207 21 9

182 22 5 229 190 21 5 243 196 22 3

249

178

240 188 23 3 224

230 200

219 211 25.4 207

­0 1500^

16 2 197 157 16 2 199 165 16 3 201

16.4
16 8 192 155 16 8

17 1 192 155 16 8 197 163 17 1 200

18 1

_

18 2

18.7
18 8

19.1

157

197

153

187 153
187 153 17 4 196

187 153 17.4 197 155 18.0
182 151 18 0

182 151
176 150 18 6 181

176 150 18.6 183 165 19.0 187 179 19.3
171

148

167 146 19 7 173 169 20 1

—

Kw

TC SHC

20 0 240 194 19 9 245 203

21 2 235
21 4 235

22 0 229 190 21 5 237
22 3 229 190 21 5

22.7 229

22 8
23 1

23 6

23.9 218 186 23 1 228 202 23 7 234

192
192
192

235 192 20 7

190 21.5

224

188 22 3 231 205 22 8

224

188 22 3
188 22.3

218 "186 23 f

181 24.5

48MA/50ME016

7,000

C

Outdoor Air Cfm

750

К w TC SHC Kw

202 161 16.5 205

16.2
194

167 16 9

16 8 199 160

200 159

17 4 189 169 17 5
17 4 191

194 161

186 167
189 163
190 160 18.5

18.0

19.1

i'79

Dutdoor Air Cfm

Kw

TC SHC

20 7 240
20 7 243
20 7 245 199

246 197

241

244 194 22.4

234
237

226 207"

224
216 206

17 2 202 164 17 4

17.2

17 7 194

165

17 8 199
17 9

158

18 3 189 182
18 4

169

18 8 183 183 19 0

...-4

19.7"

9,000

750

Kw

20 2

205 21 0
201 21 2 247 209

21 3 250 203
21 4 253 199

203

22 0 241 214

199 22 2 347

200 23 0
198 23 1 244

23 6 230

201 24.6

25.2 222

TC

SHC Kw

16 4

172
164 16,6

195 178 17 0

170 17 2

204

161 17.5
184

190

_

_ _ _

193 173 18 7

- - -

_ _ _

17 6

176 17 8

167 18 1

_ _

18 4

- - -

48MA/50ME024

1500

TC SHC

248 211
253

243 216 21 2

238 222

250 199

- _

236 220
240 21 1

20 3

203 20.6

21 4
21 6
21 7

22 0

22 2

205 22 6

22 8

23 1
23 3

205 23.6
225 23 9

217 24.1

Kw

_ _ _

222 25.6

AIR

0

Db

Wb

TC

65

85

70
65

70

90

73 284 204
75 284

65 277

70

95

75 277

78

80

70 271

100

75 271 199

78

70

105

75 264

no 78

115 75 251 191

Kw — Compressor Motor Power I nput

SHC — Sensible Heat Capacity (1000 Btuh)
TC — Total Capacity (1000 Btuh)

SHC Kw

290

207 25 4

290 207

284 204
284 204 26 3

277 201

277
277

271 199
264

258

25.4
26 3 290 221 26 7 292 236 26 8

26 3

204 26.3
201 27 3

27 3

201 27 3 292 212

27 3 295

201
201

27.3

199

28 2
28 2 285 215

28.2

196 29 1

196 29.1
194

30.0 273
30 8 263

8,000

Outdoor Air Cfm

1000

TC SHC Kw TC SHC Kw

297 218 25 7 299 228 25 8 300 230 25 9 306
302 213 26.0 307 217

295 216 26 9 300 225 27 2 293 227 26 8
298 212
300 210 27.2

283

224

288

218

208 28 4

298 206

221

280

211 29.3 298 220 30.0 279 222

288

224 29 7

273

217

278

216 31.2 282 236
223

TOTAL UNIT CFM

10,000

Outdoor A ir C fm

2000 0

TC SHC

26.3 300 230 25.9
293

27 1

305 218
308

27 6 285 244 27 7 286 225 27 8 292 247
27 9

292 233 28 2
301

28 2

306

28.5 309 207 29.2 286 225 27.8 305 229 28.9
285

28 8

29 1

293 228

277 248 30 0 272

30.1 285

31 8 270 252 32 3 258

27 5

212 27.7 293 227

220 28 7

212

241

236 30.6 272 219 29.7

293

286
286 225 27 8

29 0 286 225 27 8 303

29 1 279 222
29 6 279 222

265 217 30.6

31.8

К w

227

26 8

227

26 8 306

26.8 308 233 27.7 315 236

27 8 296

225

28 7 288

28 7 292 238

28.7

219 29 7

214 31 4

1000 2000 ’ 0

TC SHCi К w

242 26 2 309
237 26.4

311

299 244 27 2

303 239 27 4

236 27 6 312

28 1

242

28 4

236

300

295 234 29.8 304 244 30 3 285
281 247 30 3 285 272 30 5 27E

285
280

270

NOTES: 1 No values are given where unit cannot maintain the assumed room

28 6

232 28 8

244 29 3

29 6 299

241

30.5

239 31.6

246 32 3 276 "275 32 8

design relative humidity since the moisture content of the air leaving
the unit is higher than the assumed room moisture content

2. Ratings are gross and do not include fan motor heat deduction

32

48MA/50ME028

12,666“”

Outdoor Air Cfm

1000

TC SHC Kw TC SHC

26 3

252

316 241 26.7
301 260 27 3 299 249 27 2 305 267 27 5

308 248 27 7 299 249 27 2 309 261 27 7 314 271

241

294

267 28 3 292 ”247 28 2

300

256 28 6 292
244

307

236 29 3 292

312

231 29.5 292 247 28 2

315

264

292

252 30 0 285

291

260 31 0

288 260 32'2‘

306 252 26 2 313
306 252 26.2

27 9 299 249 27 2 312 258 27 9

28.1 299 249

29 1 292 247

29" 6

285

27E 241 30 1

"270 239 31 0

263

К w

27.2 313 255

247

28 2
28 2 305 258 29 0 312 266 29 4

247

28 2

_

29 1
29 1

244
244

29 1

241 30 1

236 31 "8

SHC Kw

TC

264

26 6 315

259 26 8

317

^298

301

308 254 29 1
310 251 29 2

'2941 266 29 7

298 260
300 257 30 1 - - -

2'86 Ш'
290 263

184..262
274

28 0 320

269 28 5 300 289 28 6
264 28 / 306 279 29 0

29 9 304

~30~6

30 9
32 0
32 6

268

2000

TC

SHC

322
308

318

- -

298

296 282 31 3

- -

-

274

26 7

263 27 0
282 '27 7

28 0

264

28 2

259 28.4

- -

286 29 9
274 30 3

290 30 9

.....T.....

Kw

PERFORMANCE DATA

Room Design 75 F/50% Rh

COOLING CAPACITIES

48MA/50ME030

TOTAL UNIT CFM

A1K

■ cMr

Db

Wb

65 298 215
70

65
70 292 212
73
75

65 285 209 31 8 297 234 32 6 303 255 33 0 305 264 33 2 296 232 32 5
70

. 95 75 285 209 31.8

78 285 209 31 8 311 217 33 6
80 285 209 31 8 314

70 279 207 32 8

. TOO 75

78
70

1V 0

75

110 78 266 201 34 6 289 224 36.6 303 244 37.7
115 75

0

TC

298
292

292
292

285

279 207

279 207

273 204 33 7
273 204

261 199

Kw

SHC

"29 T' 311 229 30 5 317 240

215

29 7 317 223 30 9

212

30 7

30 7 309 225 31 9 318
212 30 7
212 30 7

209 31 8 302 228 33 0 311 243 33 6 314

32 8 300 224

32.8

33 7 293 226

35 5

SHC

TC

304

313 222
315 219

306

295 230

303
288

279

OUTDOOR

AIR

TEMP

Db Wb TC

65

85

70
65 307 245 31 8

70

90

73
75 307 245 31.8 328

65 300
70 300 242 32 8

95 75 300

78 300
80 300 242 32.8 325 249

70 293 240 33 8

100

75
78 293 240 33.8 315 253 35.5 327 263

70 286 237 34 8 300 266 35 9 309 290 36 6 311

105

75 286 237 34.8 304 259 36.3 313 278 37.0

110 78 279
115 75

0 1000

Kw TC SHC

SHC

314

248 30 7

314

248 30.7

307

245

307 245 31 8 326 256 33 1 336 261 33 7 339 264 33 9

242 32 8 311 267 33 9

326 263 31 5 332 273 31 8 334 278 31 9 317 259 30 9' 330 273 31 7 335 284 32 0
331 257

319 265 32 5 324 281 32 9

31 8 323 259 32 9 331 269 33 4

315 261 33 9 323 276 34 4
242 32 8 321
242 32 8 323

307

293 240 33 8 312 257 35 3 322 271 36 0 326 277 36 3 296 250 34 1 315 268 35 5

234 35.7

300

273 231 36 6 289

8,000

Outdoor Air Cfm

1000

Kw TC SHC Kw TC

31 6 309 247 31 9 312 254 32 1

231

32 2 324
32 3

222 33 4 320 230 34 2 325

33 8 330 216 34 9 337

215

34 0 303
34 4

34.7 318 229 35.7 324

220
232 34 9

35.4 304

231 37 1

11,000

Outdoor

Kw

31.8

2000 2500 0

326

328

326

312 237 35 3 317 244

297 258 35 7

291

30 9 319

228 31.5

235 32 5
228
222 33.2 333 234

222 34 7 332

250

245 36.3 309 254

260 38 2 296

329

322 240 32 8 303

32 9

328 230

34 6 307 260 34 9 289

300 269 35 9 282 226 34 5 296 255 35 6 305 280 36 3

308

Air Cfm Outdoor Air Cfm

2000

TC SHC Kw TC SHC Kw TC SHC K w

339

32.3 312 264 32.5 317 259

262

326
334

253 33.2 339 256 33.9 343

317

287 34 1 319 297 34 2 303

34 3

255
251

263

330 263 35 0 334 267

34 5 335 255

34.6 - - - - ­34 9

315 283 35 5 318 292 35 7 296 250

325 283 34 6 303 253 33 0 319 272 34 1 326 287 34 6

35 3 _ _ _

36.4 - - -

257 37.4
264

- - - - - -

38 0 300

293 38 9

Kw TC

SHC

245

31 0 309 238 30 4 322

230 31 7 309

33 2 303 235 31 5 323 245

33.5

250 33 8 296 232 32 5 312
234

34 6
35 1

223‘
216 35 4

35 6 289 229 33 5

234 36.1 289 229 33.5 312

36.6 282 226 34.5 301 249 36.0 311

254

38 1

274

38 6 270 220

TOTAL UNIT CFM

2500

33 1 310 256 32 0 322 275 32 8

288

274 33 6 310 256 32 0 327
257 34.2 310

35 2 303 253

302

36 8 289 247 35 1 303

- -

- - -

10,000

Outdoor Air Cfm

1000 2000

SHC Kw

238
235

303

235

303 235 31 5

296 232 32 5 317 244 34 0 328 253 34 8 332 257
296 232
296 232 32 5 322

229 33.5

276 223 35.4 297 247

0 1000

TC SHC Kw

30 4 327 246 31.5 335 251 32 1 339
31 5 315

31 5

32 5

36 3

252

254

320 248

242

325
307 256 33.3 314 277 33 8 316 286

251

240 34 2 333 244 35.1

320

237 34 4 336

304

253

304 246

242

253 37 8 297 282

287

SHC Kw TC SHC Kw TC

TC

TC

SHC Kw TC

31 2 328 263 31 6

32.3 320 270

32.6

328 258 33 1
332

32.8

33.0 336 245- 33.7 340 246

33 7

319

34 7

312 273

35 0 319 260 35 8 324

324

35.3

- - -

37.2

12,000

32 7

251 33 5 336 253 33 7

266 34 2

35 4

238

35 ¡2 315 282

252 36.2

268 36.8 315 276 37.1

38 7 302 296 39 1

2000 2500

30.9 334 268 32.0 342 272 32.5 345

256 32 0 329 266 33 3

310

256

32.0 331
33 C 314 277 33 9 321

253

33 0
303 253 33 0
303 253 33.0

34 1
296 250

289
282 244
276

34.1

247 35.1 367 270 36.5 316 289 37.2 - -

36.0

241 36 8

270
263 33.4 341

323 265 34 5 333
326 261

258 34.8

328
310 274 35 2 318 294 35 7 321 303 35 9

318 263

276 36 1

302 268 37.6

275

292

338

-

34 7

- - - - - -

324

35.7 - - - - ­311 300 36 8 3T4 312 37 0

-

38 3

328 291

33 1 334

33 1
280 33 6 337
272 33 9 342

34.1

267

34 3 323

298
274

35.1

_ —

281 36 2

-

- - -

- - - -

2500
SHC

330 267 31 7

253 32.3

322 277 32 8
331

263 33 3

322 273 34.4

-

267 36 1

-

308 291 36 6

SHC Kw

337 289

274

330 298

284
275

345 268 34.3

307
294

328

_

-

34.0
33 9

35 1

— _

- -

35 5

- -

32 1

32.7
33 3

33.8

34.1

34 4
34 8

_ —

-

Kw

-

-

_

Kw — Compressor Motor Power Input
SHC — Sensible Heat Capacity (1000 Btuh)
TC — Total Capacity (1000 Btuh)

NOTES: 1. No values are given where unit cannot maintain the assumed room

design relative humidity since the moisture content of the air leaving
the unit is higher than the assumed room moisture content

2 Ratings are gross and do not include fan motor heat deduction

33

COOLING CAPACITIES

48MA/50ME030

PERFORMANCE DATA

Room Design 78 F/50% Rh

OUTDOOR

AIR

Db

Wb

65 310 217 1з0 5
70 310 217 30.5

65
70 304

90

73 304
75 304

65 297 212 32 6

70 297 212 32 6

95

75

78 297
80 297

70

100 75 291

78 291_
70 284

105

75

no

78

115 75 272

OUTDOOR

TEMP

Db

Wb TC

65

70 326

65
70 319 249

90

73 319
75

65 312 246 33 6

70

95

75 312 246 33 6 330 258
78
80

70 304 243 34 7 317 267

100

75

78 304
70 297

1ПЧ

75

no

78 290 238 36.7 309 261 38.2 319 282

115 75 284 235 37 6

0

TC

304

297

291

284

278 204 35.6

326

319

319

312 246

312 246 33 6 333 254

312 246

304

297

К w

SHC

215 31 5 314 234

31 5

215

31 5

215

31.5 325 222

215

212 32 6 317 224 34 1
212 32 6 321
212

32.6 324 217 34.5 338 218

209 33 7 304
209

33 7

209 33.7

34 7

206
206

34.7 302 229 36.1 312

201 36 5 288 234 37.9

, — -

-

0

Kw

SHC

252 31 4

31.4

252
249 32 6 329 267

32 6 333 262 33 5
249 32 6 336 259
249

32.6 338 256 33.9 348 260

33 6 325

33.6

243 34 7

34.7

243
240 35 7

240 35.7 314 263

Outdoor Air Cfm

1000 2000

TC SHC

321

231 31 2

327 226 31 5 334

319

228

323 224 32 8

307 236 33 3 312

230 33 7

312

220

233
226

310
313 222 35,4 326

297

235

227 37.3

298

- - •" - - -

Ou tdoor Air Cfm

lOPP

TC SHC Kw TC SHC

337

265 32 1 341 276 32 4
260 32.4

342

322 270 34 4 327 290

264

252 35.3 347 253 36.2

335

261 36 0

322
325 257 36.7 335 266 37,0 339

269 36 7 317 294 37 3

31C

299 268 38 9 308

8,000

Kw

TC

325

32 2 318 249 32 5
32 6

327 237 33.1 329
332

33.0 336 225 33.7

319 245 34 2
328 232 34 8

34 3 334

34 7

311

35 1 320

35 7

305 260

310 247 38.3 315
298

11,000

348 265 32.9 351
334

33 2

340

33 7 345 265

332 279 35 1 334

34 6

339

35 0

344

35 2

324

35 7

331

37.0 322

К w

SHC

241 31 4
230 32.0 337

33 5

230

256 33 7

224 35 2 339

35.5

252

35 2 314
35 9 324 246 36 2

240

36.3 331 236

232

36 3

36.9

248

263

38.8 303

2000

Kw

283 33 5 335
272 34 0

34 3

34.5 351 261 34.7
34 7

267 35 6 343
259 35 9 348 261

286 36 2 327
274 36 7 334

282 37.7

39.0

296

39 7

TOTAL UNIT CFM

2500

TC

SHC Kw

327 246

232 32.2

320 256

242 33 3
336 232 33 7
340 226

313 266
321 252 34 3
332 236

226

344

219
262 35 4 301

308 271 36 5
316 256

257 38.7 287
277 39,2

TOTAL U

2500

TC SHC К w

342

280 32 5 329 262~^ 31 7
266 33.0 329 262 31.7

290 33 6 322
342 276 34 1
348 267 34 5

328 299

286 35 2

271 35 8

-

295

281 36 9
271 37 3

320 305 37 5
325

290 37.9 301

- -

312

310 40 C 287

TC SHC Kw TC

31.5

321 241
321 241

32 6

315
315
315

34.0

315 238 32.3

33 8

308 235 33 4 318 259 34 1 323 279 34 4
308 235

35 1

308 235

35 6

308 235

35.9

308 235 33.4 332

301

36.7 301
294

37.2 294

280 224 37 3

NIT CFM

TC SHC Kw

322 260 32 8 337
322 260 32 8 339
322 260 32.8 341 267 34.1

34 8 315

315 257 33 9
315 257 33 9

36 2

315 257 33 9 336
315 257 33.9

36 3 308 254 34 9

308
308 254

301 251

-

294

10,000

Outdoor Air Cfm

0 1000 2000

Kw TC

31 2 333 '254 31 9

31.2 338 249 32.2

238 32 3 325 257 33 0
238 32 3
238 32 3 333

33 4
33 4 327 247 34 7
33 4

232 34 4
232 34 4
232 34.4

229 35 4 306
229 35.4 311

226 36.4

6 1000 2000

32 8

260

257 33 9 325 281 34 6

254

34 9

34.9 328 267 36.4 338 277 37.2
36 0 313 280 36 9 320 304 37 5

251

36.0
248 36.9 312
246

37,8 301

SHC

330 251

248 33 5

335 245

322 253

330

243
241 35,1 345 242

314 256

250 35 8 328 263 36 4 331

319

246 36.0 333

322

258 36 4
252 36.8 320 271

306 250 38.0 316 271

296 257 38.6 305 285

Ou tdoor Air Cfm

TC SHC

340 276 32 4 344
345 271 32,7

332 279 1 33 5 337 294

273 33 7 343
269 33 9 397

328 275

269

333

265 35 4 346 270 36 1
262 35.5 349 264

338
320 277 35.9 327 297 36 4 329

325 271 36 2 333 285 36 8 336 292

317 274 37.2 325

272
279

337
345

329 272
336

33 3

341 253 34 1 344

33.6

345 248 34,3 348

34 4

328 268 34 8
336

34 9 341

321 275 35 9

35 4

314

- -“ — —

12,000

К w

TC SHC

351

351
330 301

34 8

335

35 2 342 278 35 8

38.4

321

39 1 310 307 39.9 314 314

Kw

SHC

265 32 2
253 32.6 347 255

261 33 7

256
248 35 7 346

255 36.8 337
283 37 0 316

287
275

283

276
271

290

203 37.9 327
292

TC

338

33 3 331 279

339 265

324
330 275

35 4 340

36,0 350 243

323 284

37.5 323 279

38.8 320
39,5 309

К w.

TC SHC

32 6

346 291

33.1 354 277

33.8 339
34 2

345 287

34.5 350

34.7 354 271
34 9

332

35 3 337 297

345 282

_ _

-

36.3

- -

322

_

39.2

2500
SHC

269

256
250

288

260
250

270
260

294

280

29_9

2500

301

278

309

306

315

301

_

K\^

32 2

32.8

33’4

33 9
34 3

34Л ^

34 5
35 0

35.6
36 0
36J

36 1

36 7

37,J. .

37 2

37.7

39.1_

39.8

Kw

32 7

33,i

33 9
34 3
34 7
34,9

35 0

35 4
36 0

36 6
37 1

37 7

38.1

40.2

Kw — Compressor Motor Power Input

SHC — Sensible Heat Capacity (1000 Btuh)

TC — Total Capacity (1000 Btuh)

NOTES: I No values are given where unit cannot maintain the assumed room

design relative humidity since the moisture content of the air leaving
the unit is higher than the assumed room moisture content

2 Ratings are gross and do not include fan motor heat deduction

34

PERFORMANCE DATA

Room Design 80 F/50% Rh

COOLING CAPACITIES

48MA/50ME030

OUTDOOR

AIR

TEMP

pb _

85

90

95

100

105

110

115

OUTDOOR

AIR

pb

85

90

95

100

105

IIP

115

TC

Wb ^

65

319

70

319

65

*312

312

70

312

73

312

75

306

65
70

306

75

306

78

306
306

1P_

299

70
75

299

78

299

70

292

292

75

266

78

75

261

ЛР

Wb

TC SHC

335 252

65

70 335

327 249 33 1

65

70 327 249 33 1

327 249 33 1

73

327 249 33.1 346

75

320 247

65
70 320 247

320 247

75
78 320
80 320 247

70 313 244 35 3 325

313

75

313 Г244 35.3

78
70 306

306

75
78 298

292 236 38 3 306 269

75

^ 8,pop

Outdoor Air Cfm

0

SHC

218
218

215
215
215

_215__

'212'

212

212
212

2] 2

216

210
210

207

207

201

198

Kw

31 0

31.0
32 1*

32 1
32 1

32.1
33 2

33 2
33 2
33 2

33.2_
34 3

34 3

34.3_
35 3

35.3

35.6

35^5

TC

329
334_

3*2 f

327
330

331.

315
319
325
328
331

3lT
317

320^

304
30?

305
295

loop

SHC

231
226

233
228
225

122

236
231
225

221

218
233

227
223

235
229

228
234

Kw

31*6

32.0
32 7

33 1
33 3

33;5

33 8
34 2
34 6
34 8

35. P_
35 2

35.6

35-9

36 2

36.6

37.9

38.5

TC SHC

332
341

325
333
338

34^

318

325

334

340

344

318

326

332

311

318

316

304

11,pop

Outdoor Air Cfm

0 1000 2000*

Kw

TC SHC

344 266 32 6 348 276 32 8 348 280

32 0

252 32.0 349 260

247

244

241 36 4 317 270
241 36.4 321

238 37.3

336 268 33 7 340
341 263
344 259

34 2 329 270
34 2 333 265 35 1 338

34 2

338

34 2 341 255 35 7

34.2 343 253

329 261

35 3

332 258 36.8

316

Kw

TC

32.9 355 265

34 0 347 273 34 4 348 277
34 2

351

257 34.4

259 35 5

267

264 37.6 329 283 38.2 331 291
262

354

34 9 334 290 35 2 335 299 35 3

346 268 36 0 349
350
354

35.8
36 2 331 287 36 6 333

36 5 337 275 37 1 340 282

342

37 3 323

38.8 325
314 297

39 5

TOTAL UNIT CFM

2000

Kw

241

31 8

230

3Z4^
33 0

249

33 5

238
230

33 9
34,1

225
256

34 1

34.6

245
233

35 2

225

35 6
1,9

Ц9

35*7

253
241

36 3

233

36; 7

36 8

260
248

37; 3

38.8

248_

39I*

26*3~

SHC Kw TC SHC

33.3 357 267 33.4 338 263 32.2

282 34 0 342

34 7 354

265

34.9 357 262 35.1 331 260

260

280 35 5 340 286 35 6 323

36 4

260

36.6

255

37,5 345 272

268
294

37 8 326

282 39.5

40 2

2500

TC SHC

332
343

’32*6

335
341
346

319
327
338
344

ЗЛ9_

320
329
336

313
321

319
308*

354 262 36 6 323 257
358

328
317

Kw

246

31 9

232

32.5
3*3*0

256
242

33 6

233

34 1

227

34.4
34 2

257
252

34 7

237

35 5

227

35 9

220

36,3

262

35 8
36 6

247

137

37.0
37 0

272

37.6

257

39_.l

258

2I

39.7*

TOTAL UNIT CFM

2500

Kw

32 9

34 1

290

34 5

34 9

268

272 36 2 323

255 36.9 323
296 36 8 316 255 35 6 328

37 3 316 255 35 6

37.7 316 255 35.6 335

306 37 9 309 252 36 6 320 280

38.4

292 39.8 301 249

311 40 5 295

TC SHC

330
330

323*
323
323
323

316
316
316
316
316

309
309
309

302

.302

295

Wb

TC

338

331 260
331 260
331 260

323 257

309

10,000

Outdoor Air Cfm

241
241

*238
238
238
238

236
236

236
236
236

'233

233

233

230

230

227

Й5

0

Kw

31 7

31.7
32 9

32 9
32 9

32.9
34*0

34 0
34 0
34 0

34.0
*35*0

35 0

35.0
36 1

36.1
39-L

38 C

1000

TC SHC Kw

255

340

249

345

*257

33*2

252

337

248

340

246

342

259

325
329

254

334

248

337

244
241

339

256

321
326

250

329

246

314

258

318

253

313

251

303

258

32 4

32.7
33 5

33 8
34 0

34; 1

34*6
34 9
35 2
35 4

35.6
35 9

36 3

36.5
37**0*

37.3

38.6
39*2

TC

34*3
35

336
343
348
351

329
335
342
348
351

327
334
339

320
326

322
311

12,000

Outdoor Air Cfm

0

Kw

SHC

32 2

263

33 4 340 279
33 4
33 4 347 270
33 4 349 268

34 5 333
34 5 336 276 35 4 341 291 35 7

257

257 34 5

34 5 343

257 34.5 345

252 36 6

37.6 319 273 39 0

247 38 5

1060

Kw

SHC

TC

348
352 271 33.1 358

344 274 34 2 350 284

340

332 272 36 8 340

324

309

32 8 351 287 331 352 291

277

34 0 344 294 34 2

34 4 354 276
34 6 357 272

337

35 1

281

270 35 7 348
266

35 9 353

264 36.0 356
278 36 4

269 37.0

275

280

334

344

37 5 326
37 8 331

327 294 39 7

39 7 316 308 40 5 319 319

2000

Kw

SH*1

265

32 6

254^

33.1

*33 7

272

34 2

261
254

34 5

34.7

249

34*9

279
269

35 3

257

35 8

249

36 2

36.4

241

36 4

276*
264

36 9

256

37.3
37*5

283

37.9

272

39.3

27 2_
286

40.0

2000 2500*

TC SHC

Kw TC

276 33.5 360

34 6
34 9
351

301 35 4 338 310

279 36 2 251 283
271 36 5 356 273

36.8

266

36 9 336 307

298
286 37 3 342 293
279 37.6

306

38 0 328 316
38 4 334 302

294

2500

TC jSHC

34/~^*’269*

353 256
337

279

345

266
257

350
354

250
289

3*30

275

336

261

346
351

251

356

?4i

329

28*5*
271

337

261_

343
322

*295*

328

280

326

281

315*

30*0

SHC

278
301

345
352 288

279

357

273

360

343

298

347

283

- -

Kw

32 *6 *

33.2

'3*3*8

34 3
34 7

34.9
35*0

35 4
36 0
36 4

36.7 ^
36 5

37 1

37.6

*37 7 '

38.2

316

40.3

Kw

33 i

33 6
34 3*

34 7
35 1
35 3

35 5
35 8
36 4
36 8

-

37 0
37 5

37.9
38 2

38 6

'40 7

Kw — Compressor Motor Power Input

SHC — Sensible Heat Capacity (1000 Btuh)

TC — Total Capacity (1000 Btuh)

NOTES: 1 No values are given where unit cannot maintain the assumed room

design relative humidity since the moisture content of the air leaving
the unit is higher than the assumed room moisture content

2 Ratings are gross and do not include fan motor heat deduction

35

COOLING CAPACITIES

48MA/50ME034

PERFORMANCE DATA

Room Design 75 F/50% Rh

OUTDOOR

AIR

TEMP

Db

Wb

65 314

70

65 307

70 307

9D

73 307
75 307 228

65 300 225

70

95

75
78
80

70

100

75 293 222 31 8
80

70

1ПЦ

75

no

78

115 75 271

OUTDOOR

AIR

TEMP

Db Wb

65 325 254 29 1

85

70 325

65 318 “зоТ

70

90

73 318
75 318 251 30.2

65 310 247
70

95

75 310 247 31 3
78
80

70

100

75 302
78 302

70 294 241

105

75

no

78 287

115 75 279

-

0

TC

314 231 28.6 332 240 29.5 342

300 225
300 225
300 225

300 225 30.7 329 231

293

293
285 219

285 219
278 215

Kw

^SHC

231 28 6

29 6

228

29 6 324

228
228 29 6

29.6
30 7

30 7
30 7 322 238 32 C 336 247
30 7 326

222 31 8

222

31.8 318
32 8 300

32 8 306 242 34 1
33 8 301 240 35 4 316

212 34 7

1000

TC SHC

246 29 2

326

318 248 30 3 325 264

242 30 6 334

239

32S

236

330
311

250 31 3

316 244

234

246 32 7

308
314

240
236

248

246 36 1

290

Jtdoor

0

30 8

30.9

31 6 326

32 2

32.4

33 1

33.3
33 8 314

Kw

”9,C

00

Air Cfm

11,000

—

0

__

SHC

254

29 1

251

318

310

310
310 247 31 3

302 244 32 4

294 241 33.4

30 2

251

30 2

31 3

247 31.3

247 31 3

244

32 4

244 32 4

33 4

34 4

238
234

35 4

Kw

Outdoor Air Cfm

1000

TC

336
341

J28

334
337
339

324
325
331
334

337

322
325

308
313

308
296

Kw

SHC

29 7 343 279 30 1 345 285 30 2 329 264 29 3

268
262 30 0 352 268 30 5 355 270 30 7 329 264 29 3

30 8 335

270
264

31 1
31 3

261

31 4 353 262 32 1 358 264 32 4 322 261

256

32 1 332

275
267 32 2 334 282 32 7 338
260 32 5 344 270
256 32 7
253 32 8 354 256 33 8

33 2 326 290

268
262 33 6 335 277

33 8 340 269

258

34 3 322

270

264

34.6

262 35 9

36 6 312 303 37 8

268

—

...........

2000

Kw

SHC

TC

257 29 6

333

341
345 240

322 275 32 0

343 239
348

318 267 33 3 321
328
334

319 262 35.0 324

306 280 37 3 312

30.0

245

30 6 327
253 31 1 339
245 31 5

31.7 351 242

260 32 2

32 8 342 252

33 2 350 241
233 33.4

254

33 9 333 261
246 34.3 341

34 7

278

261 36 4

TOTAL UNIT CFM

2500

TC

336 262
347

346

325
330 267 32 4

356 234

319 291

- - - 283

Kw

SHC

29 7

247

30.3 320 243

272

30 8 313 240 29 9
31 4

257
248 31 7 313

32.0 313 240 29.9

286

32 2 305 237

33 1 305
33 6

33.9 305

277 33 5

34 2

251

34.7
35 0

271

35 3 290

295 37 8

TOTAL UNIT CFM

TC SHC

320 243 28 9 331

313

240 29 9 329 253 30 9 340 264 31 4
240 29 9 333

305 237

237 31 0

305 237 31 0

237 31.0 333 242
233

298
298 233 32 1

233

298
290

230
230 33.1

227

275 224

- ' -

2000 2500 0

TC SHC

343 275 31 6 347 280 31 8 322 261
349 268

350

Kw

TC SHC

31 1 342 299 31 5 322 261

28/

31 9 354 271

32 5 335

298

33 2

349

262 33 5

- _ _

- - -

33 8 334 304
34 3

340

_

34 7
35 2 326 313 35 4

301
284 35.4

325

- - - - - -

330

- -

Kw

TC SHC

32 1 322 261 30 4 341

32 7 314

308

32 9 314

290
274

33 5 314

34 3 306 255 32 6

284

34.6 306 255 32 6 325 273 33 8

-

-

294

35 7 298 251 33 6 316 275

258 31 5 328 286 32 31
258
258

314

258

314

258

306 255 32 6

251 33 6 311

298

290 248 34 6 31 : 273 36 1

245 35" 6 299

282

10,C

00

tdoor

Ou

0

К w

28.9 337

31 0 319 264 31 8
31 C 321 256 31 9 331 271

32 1 313

32.1
33 1 304

34 1
35 1 293 257 36 4 309 292 37 6

—

1000 2000

TC SHC

257
251 29.8 348

324 259 30 6 330 276 30 9

250 31.0 345 257 31 7

335 247 31^ 349

327 249 32 3 340 259 33 0
330 245 32 5 347

257
318 251 33 3 331
322 247 33.6 338 258 34.5

259 34 1

253 34.4

310
305 251 35.7 319 272

Air Cfm

Kw 1

TC SHC

29 5 338

328 287 32 3 331 297 32 5

32.6 351 245 33.6
33 C 322

318 290 35 0 323
322 273 35.2

12,000

Outdoor Air Cfm

1000 2000 2500

Kw

TC

340
345

30 T 7337^
30 4 337 275

343

30 4

Kw

SHC

279
273 30 2 355 279 30_7 359

281 TTT^O 297' 31 3 346 '3TO 31 7
272

269

TC SHC

29 9 347 290

31 3

347 286 31 8 350 291 32 0
31 4 352 279 32 0 357 282
31 6

355 273 32.2 361 275 32 5

336 309 32“" 8

31 5

329 277
31 5 334
31 5

337 267
31 5

340

320

328

32 4 338 293 32 9
32 7 347 280

271

32 9 352 272 33 7

264 33 0
279 33 5

269
281

279

- - - “ -

329
337

34 0

- - - - - -

34 5 325 312 35 4 329 324
34 8

328

-

К w

TC

29 8

268
257

30.3 352 259

251 31.9 355 253

32 5 335 279

250 33 4 353 253

279 33 6 326

34 1

266

36.6

Kw

30 3

SHC

341 273

338

288
343 269 31 6
350 260 32 0

346 263

_

289 33 8
337 273
344

263 34.9

302 35 2
328 283 35.5

- - -

315 307

TC SHC Kw

349

295 30 4
281

319

338
341

301

351 285 33.6

- - -

337 315 34 4

295

300
288

33 4

34 C
34 5 342

295 35 6 - -

- -

~

-

-

_ _

■ —

- -

2500 W

Kw

30 0

30.5
31 3

32.2

32 7
33 3 1
33 7

34 4

38 0

30 9

32 3

32 9
33 1

34 8

35 6

Kw — Compressor Motor Power Input

SHC — Sensible Heat Capacity (1000 Btuh)

TC — Total Capacity (1000 Btuh)

NOTES: 1 No values are given where unit cannot maintain the assumed room

design relative humidity since the moisture content of the air leaving
the unit is higher than the assumed room moisture content

2 Ratings are gross and do not include fan motor heat deduction

36

PERFORMANCE DATA

Room Design 78 F/50% Rh

COOLING CAPACITIES

48MA/50ME034

OUTDOOR

AIR

Db Wb

65

RS

_70 333

65
70 326

9D

73 326 243

_75 326

65 319
70 319

95

75 319 240 31 8
78 319 240
80 319

70 311

100

75 311
78 311

__

_

70 303

105

75 303 234
78 295

-JIL

115

75 287

---

---

OUTDOOR

AIR

TEMP

Db Wb

65 343 269

85

70 343

65 335

70

90

73 335

75 335 266
65 327 263

70

95 75 327

78 327
80

70

100

75 319 259
78 319 259_,

70 311

105

75

110'^

78

115 75 295

0

TC SHC Kw

333 246

246

326

243
243

243
240 31 8 331

240 31 8

240
237

237
237

234

231
228 36 0 304 261

—

.

--

-

0

TC

SHC

269
266 31 2 344

335 266 31 2

266 31 2

327 263 32 3

263 32 3
263 32 3 349

327 263 32.3
319 259 33 4

256 34 5

311

256

302, 253

250 36 5

—

—

_jOi

Jtdoor Air 1

1000

TC

29 6
29,6 349

30 7
30 7 341
30 7 344

_30.7 346

31 8 342

31.8
32 9 324

32 9 329

32.9 333 251
34 0

34.0

35.C 3]5. 255 36.4

SHC

343

260 30 1
254

335 262

257 31 5
253
251 31.8 359

267 32 5 337
333 259
338 253 32 9

249 33 1 356 254
344

246 33.2

261 33 7 331
255 34 0 341

*315 263 34 8

321 257

-

------

--

—

0

Kw

30 1 352

30.1 358 277

31.2 354

32 3 339

33 4 336

33.4 339

34.5 327 279

35.5 321

1000

TC

SHC

282 30 5 357 293

284 31 6 354

349

279

352 276 32 1

273 32.2 366

289 33 G 346
340 281 33 0
345 275 33 3 356

271 33 5 362
351 269 33.6

332 283 34 1

277

273 34.6
326

288 35 4 335

277

310 283 37 6

10,000

Ifm

2000

Kw

30.4
31 2 340

31 6 355

32 6 341 274

34.2

35.1 331

37 1

Jtdoor Air

Kw

30.8 366 282

31 9

34 4

35.5 337 299

36.8

SHC

TC

349

271 30 3 350 276

357

260
278

349 267 31 9

260
255 32.4 364

289 32.9

350 262 33 5

360 249 34.1

282 34 1
269 34 7

347 261
328 293

277

328 276

295

318

12,000

Zfm

200C

TC SHC

305

357

290 32 3

362 282

278
312 33 3

348 297

285 33 9
277 34 2

366 271
343

308 34 8

347

292
284

352

315 36 C

333

298

323 318

~ -

Kw

30.8
31 4

32 2

33 0

33 9

35.0 352
35 6

35.8 335 286 36.1

37.2 333
38 2 323

--

.

—

Kw

30 8 359

31.2 369 284
32 1

32 6 366

32.8 370 279 33.0

33 4

34.4

35 0 351 299

35.4

36.2 341

^37.6

38 6 328

TOTAL UNIT CFM

2500

TC

SHC

361

262

347 290 31 S

272 32 1

352
359

263
256 32.7

340 299 33 0 323
344 282

354

266 33 8

362

256 34 2 323

367

250 34.5

339 296 34 6

345 276

266 35.4

331 305

286 37.6

310

-

-

TOTAL UNIT

—

2500

TC SHC

298 30 9 346

356 312
360 294

285 32 8

348 322
350 304
361 289
367 279

_ _

346 318 35 0 322

357 289
338 328 36 2

309

_

_

328 38 9 297

- ~ -

Kw

30 4

31.0

32 4 331

33 2 323

34 9

35 8 307

38 6 291

0

TC

SHC

338

258

338 258 29 8 353 266
331

255 30 9

331

255 30 9 345
255

331

323 252

32.3
315

315
315

307

299 242

__

30 9 349 265 31 9

255 30.9 351
252 32 1 336

252

32 1 337 270

32 1 342 264
252 32 1
252 32 1

248 33 2

33 2

248
248 33.2 336 262

245 34 2 322
245 34.2 324

35.3 319 266

239 36 3 307

- .

—

Kw

31.4
32 3 339

32 5

33 5 331
33 6 331
34 1 331
34 5 331

_

35 3

35.7 322

36.4

_

0

TC

SHC

280

346

280 30.2 361
277 31 3 347

339

277 31 3

339

277

3.39

277 31.3 357 284
273

32 5 343
273 32 5 344
273 32 5
273 32 5

331

273

32.5 354

270 33 6 334

322

270

33 6 339

270

314
314

305

33,,6j 342 .284
267 34 7 329

267

34.7

264 35.7

260 36 7 312

- --

Kw

29 8

__

_

Kw

30 2 356 293

31 3 355

'_q

loo'o

TC

SHC

348 271

340 273 31 4

268

262
278 32 7 342

346 260

l348

258

328 272 33 9 335 293 34 4
333 266 34 2 344

277 35 2 331 304
268 35.3 334

272

____

. - ™ ___

1060

TC SHC

288
295 31 8

352 290 32.1

286 32 2 365 293

300 33 2 349

292
349 286 33 5
352 282

279

294 34 3
288

299 35 6

330 290 35 7
323

288 37.0
294

)oo''

Jtdoor

Air (

Kw

TC

30 3 353 282

30.6 362
349

31.7

353
359

32.0 363

32 8 345
33 1

353

33 3 359 266 34 1

33.4

363

34.4

350 273

36.6

330

37 4 321 307

_ 13,000

Outdoor Air Cfm

Kw

TC SHC

30 T 36; 304

31.0 369 293

357 316

360

32.3 368

33 2 351

359

33 6 364

368 282

33.8
346 319

34 6 349

34.8 354
337 326 36 2 341

340

37.8 325 325

2000

Kw

30 6

31.0 365 273
31 9

32 4 363 274

32.6 367
33 1

33 7

34.3

35.2
35 8

36 n 339

37.4
38 4 325 321

_

___

2000

Kw

31 0

31.4
32 3 359

32 7

32.9
33 5 352 333

33 6

34 3

34.5
35 0 349

35.5

38 8

—

2fm

SHC

271
293

279 32 1 356 283
271
266

301
286 33 2 347
273

260

281 34.9

288
287

300 32 5

288
323

308
295 34 1 363
288

303 35 2
295

310 36.3 343

- -

—-

TC

355 287

351 301 ^

345 311

358
365
370 261

343 307
348 288 35 1

355
335

_

-

----

TC

363
372 295

363 305
369
373 290 33.1

354

_ _

353 310

_

- -

?50ri

SHC

268

293 33 4
278
268 34 4

278
316 36 0

297

-

" 2500

SHC

309 '"311

323 32 4

296 32 9

315 33 8
300

_ _

329

-

338 36 4
319 36 5

_

—

30 7

31.2
32 0

32 3
32 6

32.8
33 2 '

34 0

34 6
34'8~

35.5

36.3

38 8

31.5

32 6

33 7

34 3

35 2
35 4

Kw

_

_

-

Kw — Compressor Motor Power Input
SHC — Sensible Heat Capacity (1000 Btuh)
TC — Total Capacity (1000 Btuh)

NOTES: 1. No values are given where unit cannot maintain the assumed room

design relative humidity since the moisture content of the air leaving

the unit is higher than the assumed room moisture content

2 Ratings are gross and do not include fan motor heat deduction

37

COOLING CAPACITIES

PERFORMANCE DATA

48MA/50ME034

AIR

TPL4P

_____

Db Wb

85

90

_

___

_

95

100

105

_ II?

115 75

OUTDOOR

AIR

TEMP

Db

85

90

95

100

105

lis

TC

65 343
70 343

65 336 244
70

336

73 336
75 336 244

65 328 241

70

328 241

75 328 241
78 328 241
80

328 241

70 320
75 320
78

320

70

312 235 34 6

_75

jn

78 зоР

296

TC

—

65

353 270

70

353

65~

345 267

70

345

73

345 267

75

345 267

65

337 264

70

337 264

75

337

78

337

8^

337

70“

329 261

75

329 261

329

Z®
У6"

■32b 257'

75

320 257

78

Ш

75~

304*“'

0

Kw

SHC

247
247

244
244

238 33 5
238
238 33.5 341 252

_235 34.6

232
229 36 6 ^Tl

TC SHC

30 1 352 260

30.1 15 7_ 255
31 2 344

31 2

349 257 31 9

31 2

352

31.2

355 252

32 3

339 267
32 3 341
32 3

346
32 3

350 250 33 5 363

32.3

352

332
33 5

337 256

326 266

128_ _258 35.6

J351 123 256

...

- _

SHC

Kv^

TC

361

30 6

270

267

264
264
264

261

254

251

30 6
31 7

31 7
31 7

3.W

32 8
32 8
32 8
32 8
32 8

34 0
34 0

310

35 1
35 1

36 1

3^ 2'

366

353

358

36 I
36_3

34"8

349
354
357

359

345*
345
348

3"34
335

32Ц

317

10,000

Air Cfm

Outdoor

lOOC 2000

Kw

TC

30 5 356

30.8 365

262

31 б1 352 282

254

32 1

32.2
32 9

259

33 0

254

33 3

247

33.7

261

34 2 342 286
34 5

34.7
35 5 '335 293

36.9 1

262 37 7

0

Jtdoor

160c

Kw

SHC

283 31 0
278 31 2 373

285 32 1 361
280 32 3

277

32 5 370 283 33 0

274

32 0 373

290

33 4

282 33 5

276

33 8 363

272

34 0 369

270 34 1
284

34 6 350
278 34 9
274

35 1 359

Г35 9

289
280

36 0
278

37 3 339
284

38 1 330

_26p

357 268 32 3 361
362 26'
366

345
348
357 263

367 250

348 270 35 1
353 263

338 278_ [36.2 345_
334
325

000

12,

Air Cfm

"Ibob

TC SHC

365

365 291 32 7 369

354

355

373 273

354

342 316 36 5 *■ 347
344

SHC Kw

30 9

271

256
289

275

255 34 3 373

77Л
29^1

111

32 1 355

32 6 369

32.8
33 3

33 4
33 9 365

34.5 378
34 8

35.4
36 0

37.7 343
38 7 ^32

358
370

374
348

352

348
355
363

340

Kw

294

31 2

283 31 6
305 32 o'*! 365

279 33 2
3i2

298 33 9 359
286
278 34 6

309 35 2 356
293 35 5 361

285 35 8 368

300
300 38 6
319

367
378

376
381 282 33 5

33 8

357

34 3

371
378

34 3

J6 6

350

39 1 337

TOTAL UNIT CFM

3000

TC

SHC К w

281 30 8
264 31.4
¿97

277 32 5
266 32 9
259 33.2

309 33 4
290 33 7
272
260 34 8
252 35.1

^305' "35'

284 35 5

273

318 36 4
297 36.7

298 38.0

325 39 3

TOTAL UNIT CFM

3000

T?

SHC

304
287 31 8

320 32 7
300 32 9
289 33 3

332 33 9
312 34 1
295
283 35 1

-

- ~

328 ^5 6
307 35 9
295 36 3

340
319

-

337 39 6

0

TC SHC

349 259
349 259

32 2 341

341 256
341 256
341 256

333 253'
333 253

34 4

333 253
333 253
333j

325 250 33 7
325 250 33 7 341

36.0 325 250 33 7
317 246

317 246
308

300 240 36 9 314 273

—

Kw

30 4

30.4

256

31 5
31 5
31 5

31.5
32 6 344

32 6
32 6
32 6 354

253

32.6 356 259

34 8 330

34.8 332

243

35.9 326 268

-

0

Kw

31 3

357 281
357

349
349
349 278 31 9
349 278 31.9

340 275
340 275

34 7

340 275
340
340 275 33 0

332 '271
332 271
332 271

36 8

323

37 0

323
ЗТ5 '
306* 262

Tcl SHC

30 8

281 30 8

278 31 9
278 31 9

33 0 352 301
33 0 352 293
33 0 357

275 33 0

34 2
34 2
34 2

Ьб8 ■3ГЗ

268

35 3 338 291

*265* *ЗбТ

WJ

Kw TC*'

Room Design 80 F/50% Rh

11,000

Outdoor Air Cfm

1000

TC SHC

357 272
362 267

274

349
354 269
357 266
359 263 32.4

279 33 2
271

345
350 265 33 6 360

261 33 8

Г3З6 273 '34 4 347

267

345 263 34 9 356

'278 135 7 338

269

^35.8

----

- -

Outdoor

looo

SHC

294 31 2

365

1289

370
356 32 3

361 291
364 287

285

366

287 33 9 366
360 283 34 1 371
362 281 34 2

з4з 295

289

347
350 285

ТГ9 295

"SOfT

_

1З5.З

ЖТ

17 5

Kw

30 8

31.C
31 0 357

32 1
32 3 366

33 3 352

33.9

34 7

37.1 337 289
37 9 327

13,

Kw

31 4 377

32 5 368
32 7 373
32 8 376

33 6 357
33 7 358

34 8 353
35 1

36 2 346 1 311

38 3

2000

TC SHC

361

283 31 0

369

272

294 32 3

361

279 32 5 365
272 32 8 372

370

267

350 'З0Г

287
275

366

267
261

370

298

351

282 35 3 358 296
274 35 6

305 36 2 344

341

289 36 4

308 38 9 '"ззз

000

Air Cfm

"2006

TC

SHC

369

305

294

*365

ГзТб 12*7 367

302 32 9
295 33 1 376
290

323 34 0 359
309 34 0
297 34 5
289 34 7

375 283 34 9

320 l5 4" 356

356

304 35.6

361

i296 i35 9

__

[ 327' 36 6

14i

liT 18 2

-332

"333

Kw

31.4

33 0
33 5

33 7
34 1
34 4 376

34.7
35 0 352

37.9 345

Kw

31 4
31 7

33 3

i365
[348 339

36 7

3000

TC

SHC

363
374

360

,377
353

356
368

381 264 35.3

365 284 36 2

348

Г Kw

292

276 31.6
309 32 5

289
278
271 33.4

321 [33 7
301 33 9

283
272 35 0

3iZ

329 36 6
308

309 38.4
335 Г39 5

2500

TC

SHC

370

310 31 4

379

296

*324 ^

370 306 33 0

298

380 291

333 34 1

360

316

370

301

376

292 35 0

330

360 311

302 35 2

16*8 ■

321

350

--

-

■

‘336*^

■3З6

31 1

32 8
33 1

34 6

35 4"’
35 7

36.9

Kw

31 9
32 8

33 3
33 5

34 1
34 7

35 6

35 8

37 0

__

Kw — Compressor Motor Power Input
SHC — Sensible Heat Capacity (1000 Btuh)
TC — Total Capacity (1 000 Btuh)

NOTES: 1. No values are given where unit cannot maintain the assumed room

design relative humidity since the moisture content of the air leaving
the unit is higher than the assumed room moisture content

2 Ratings are gross and do not include fan motor heat deduction

TQ

PERFORMANCE DATA

Room Design 75 F/50% Rh

_

— , ____ - —

OUTDOOR

Db Wb TC

95 75

100 75

1 U U

no 78

115 75

OUTDOOR

Db Wb

95 75 367 279 40 0

100

110 78 349 279 44.7 364 302

115

“ - —“

Outdoor Air Cfm

0

Kw

65 367 262 36 8
70 367 262

65
70
73
75

65
70 361 264 39 8

78 361 264 39 8 402
80 361 264 39 8

70
78

70 351 263 42 8
75 351

SHC^

364
364
364

364 263
361 264

361 264

355
355
355

342
334

.

36,8 410 290 39.5

263 38 3
263 38 3 401 293
263

38 3 408 291 41 4 419 298 42 8

38.3 413 290 41 5 425 293 43 1
39 8 386

39 8

264 41 3 397 294 43 9
264 41 3 383 288 44 6 390 300 46 2 399
264 41 3

263 42.8

44.3 354 280

260
257 45 8

• ‘ —

1000

frc SHC

294

402

394

392 295 42 3 398 309
398

405

387
365

368

336

* - •“

39 0

297 40 4 403

40 9 412

41 8

300

289 43 1 408 296 44 6 416 304 45 6

43 4 413 287 45 2 427

285
282 43 6 418

284 44 9 397
294 45 5 364

287 46.1 373 303

48.2 360 298 50.1 373 319 51 4 347 269 44 6 359 291 48 4 366 309

283 49 4

— -

Outdoor Air Cfm

0

TC s'hc^ Kw

371 273 36 9 409

65
70 371 273 36.9 417 307

369 276

65
70 369 276 38 5 409 312 41 2

369 276

73
75 369 276 38.5 423 312

65 367 279 40 0 395 320 42 1
70 367 279

78 367
80 367 279

70 362
75

362

78

362

70 357

357

75

75 342

38 5 402 315 40 7 415 339 42 0 417

38 5 416 311 41 7 431

40 0 401

279 40 0 412 307 43 7

40.0 415 304 44.0 427 304
41 6

280

41 6

280
280 41.6 397 307 45.3

281 43 1 376 317 45 9
281 43.1 379 310 46.5

46 3 347

278

1000

TC SHC Kw TC

310 39 2

39.8 437

41.8

316

408 311 43 4 418 319

388 317 44 3
394 310 45 0

42 7 410

48 6 371 320 50.5

305 49 9 350 331

11,000 12,000

Kw

13,000

COOLING CAPACITIES

__ .

„ ™

----

2000 3000 0 1000 2000

SHC Kw TC

TC

416 311 40 2 420
426

300 40.8
316 41 6 404

304 42 3 418 314

321

390

381

338

43 1
43 8

45 6

281
313 45 4 384

291 46 7 410 302 47 8

j_,i .

46 9 366

47.8 381 322 48.8 354 271

309 51 3 347 336 52 9

- “ -

- —- —

2000 3000

К w

shYI

426

333 40 5 432 345

41.2 446 329

322

423

436
403 345

423 310 45 5 436 315 46 6

393 336 45 7
400 322 46 6
406 314 47.1 417 324

'*375 338 47 3 376

383 325 48.2

42 6

328
321 43 2 439 327 44 0
316 43.4

43 4 401 362 44 2
44 1 414

333

45 0

45,9 442 307

51 7 359 354

TOTAL UNIT CFM

- —

Ontdoor Air Cfm

Kw

SHC

322 40 8^

434

305 41.6
330 42 3 366 270 38 4 399 307 40 6 41C 328

427

303 43 7 366 270 38 4 413 303

434

295

388 339
402

323 44 6

292 46 3
284

433

331 46 3 ззГ’ 273
313 47 2 359 273

338 48 0

TOTAL UNIT CFM

------- — -

---

-

TC SHC

368
368 268

43 1 366 270 38 4

44 1

366 270 38 4 419 302 41 8 431 305

364

43 8~i

364

364
364
364

46 7

359 273

354 271 43 0 371 306 45 7 370 327 47 1 371

339

—--“1------- - •

Kw

fc SHC

36 8 406 302 39 1 423 323

268

36 8 414 300 39 7 432 312

406 303 41 1

272

39 9 392 312 42 0

272 39 9

272 39 9 404 301 43 3

272 39 9

272 39 9

269 46 1

----

-----

398

408
411 294 43 8

41 5 384
41 5

389

41 5 393 296 45.1

374 299 46.3 378 314 48.0

43.0

342

—

----

-

41 7 426

307 42 6

297 43 8 419 299 45 4 433

44 2

306
300 44 8

295 49 7 343 320 51 6

-- --

Outdoor Air Cfm

6

TC SHC Kw

354 42.7

430

338

445 319 44.3

347

427

328 46 0 369 286 40.1

395 353 46 7 364 287 41 7

336 47 6 364 287 41 7

408

359 48 4 359 289 43 2
344

390

341

380

TC SHC

41 1 374

42.0 374
371 282

43 5

371 282
371 282
371 282 38.6 427 322 41.9

369 286 40 1 397 328 42 2 409

45 0 369

369

47.0 369 286 40.1 419 315 44.1 431

48.2 364 287 41.7

49.2 359 289 43.2 384

51.7

352 288

53 3 345 287 46 4

Kw

279 37 1
279 37.1

38 6 405 323 40 8 419 349
38 6 412 321
38 6 419 320

286

40 1 405 326 42 9 416

286

40 1 416 317 43 8

44.8

1000 2000

TC SH?

412 318 39 4 429

315

420

412

Г393

398
402 318

380 328 46 1 380

368 313 48 8 377
352

39.9 442

41 4
41 8

321

43 5 422

44 5

327
321 45 1

45.4

321 46.7 388 335 48.4

316

50 Г

48MA/50ME040

_ -

_ —

Kw TC

418

397 334
404
414

423 293 45 8 438 296 46 9

387 325 45 6 390 342
396
402

- —

14,000

Kw

TC

429 339 42 8
439 332
440 328 43.5 449

428 321

398 347
405
410 325 47.2

357

—

“

Kw

SHC

317 42 5
310 43 0 434 315

322
308 44 9 423 316 45 8

311 46 5 404
303 47 0 414

SHC

342
333

356 43 5 409
345
330 45 2 431 339

315 46.0 445

333

Г 2A9

330 50.7 385
343 51 8

TC

427

40 4
41 0

441

41 8

411 ^343
425 326 43 3

43 4 440 308 44 2
43 3 398 351 44 1

44 0

409

385 333 49 0

37б"

50 3

353 347 53 1

— —

Kw

fc

40 6

438 356 41 3

41.4

451

42 1

422 364
435 349

43 3 443

44 2

418 358

45 7 438 326 46 7

45 9 400 364 46 9
46 8

413
420 334

47 5

382 369
395

365

------

—

3000

SHC

335 41 0
318 41 9

335 44 8

305 46 4

325 47 4
313

1349

3000
SHC

340 42.2

338 44 2

330

373 44 4

317 47.1

347

355 49.3

351 51.8
362

42 5

43 9

46 5

48.0
48 3

si'5 ‘

——

42 8
43 6

44.5

45 1
46 1

47 7

48.3.
48 6

53 6

К w

Kw

Kw — Compressor Motor Power Input
SHC — Sensible Heat Capacity (1000 Btuh)
TC — Total Capacity (1000 Btuh)

NOTES: 1 No values are given where unit cannot maintain the assumed room

design relative humidity since the moisture content of the air leaving
the unit is higher than the assumed room moisture content

2 Ratings are gross and do not include fan motor heat deduction

COOLING CAPACITIES

PERFORMANCE DATA

48MA/50ME040

OUTDOOR

Db

85

90

95

100

105

110

115

OUTDOOR

TEMP

Db

85

9D

95

100

no

115

.—

AIR

Wb

TC

65 372 262
70 372 262

65 371 266 38 5 403 302 40 8 415

371

70
73 371 266 38 5
75 371 266 38.5 423 298 41.8 439 303 43.5 448

65 370 269
70 370 269 40 2 404 303 42 8 414 320 44 2 416

370 269 40 2 411

75
78 370 269 40 2 416 295 43 8 429 299 45 6 442
80

370 269 40.2 420 292 44.0
364

70

364

75

364 269 41.7 404 295

78
70 359 268 43 2 383 306 46 0 381 328

359

75

352

78

345

75

AIR

¡5

Wb TC

65 378 276 37 2
70 378 276 37.2 424 312

65

377

70

377

73 377
75 377

65 375 284
70 375 284

375 284

75
78

375

80 375 284 40.4
70

370 285 42 0 402 326 44 8 409

75 370 285 42 0
78 370 285

364

70

364

75
78

358 285 45.1
351

75

Room Design 78 F/50% Rh

-

....

11,000

— —

TOTALU

Outdoor Air Cfm Outdoor Air Cfm

0 1000 2000 3000 0 1000 2000

Kw

SHC

266 38 5

269
269

268
267 44.8 372 293 48.8
265

TC

410 298

37 9

417 295 39.8 438

37.9

411
417

40 2 396

41 7

393

41 7 399 299

43.2 386 299 46.6 391 315 48.3 397

46 4

358 298

Kw

SHC

299

298

306 42.2

298

304 44 4

TC SHC

39 3 425 318 40 4 431

41 3 426 314 42 7

41 7 433 307 43 2

405 331

43 4 423 307 45 1 431

434 293

398

407 311 46 7 414 324

45 0

45.4

412 303 47.2 425

379 311 50 6 387

49 9 356 322 51 9 363 347

13,000

Ou

0

К w

SHC

280 38 8 409 320 41 0
280
280 38 8 424 317 42 0 444 331 43 6
280 38.8 431

284

285 43 5 392
285 43.5 397 323

285 46 7 368 322 50 4 368 345 52 3

TC

416

38 8

418 318

40 4 403 325 42 5 416 355 43 8

411

40 4
40 4 420 319 43 8 434 332 45 4

40 4 423 316 44 1 439

427

408

42.0 413

384

tdoor Air C

1000

К w

SHC

314

317

323 43 2 425 345 44 5

314

321 45 4 419 336 47 0
319 45.7

330

318 49.2 389

TC SHC

39 5 434 337

40.0 446
425

41 6

436 336 43 0 442

42.2 450 328 43.9

44.4

443

423 328 47.5

46 3

393 352 47 8 394

46.9 403

Kw

TC SHC Kw

307 41.2
324 41 9

43 4

46.0 448 295

324

45 8 398

47 4

329 41 1

7145

312 41.9 375

417

339 42 6 374 273

431

323 43 4 374 273 38 7 415 310

441 313 44 0 374 273

305 44.4

402

348
333 44 9 374 277
315 46 C 374 277
306 46 7 374

340 46 7

312 48.3 368 277 41.9

381 347

333
330 51 9 355 277 45 0 378 306 49 0 385

JPJ

fm

2000

Kw

40 8 442 352 41 4

328 41.5 456 336
346

42 3 429

323 46 0 451 327

318 46.3 457 319

46 2 411

348

341

48.6 407

334

51.1 397

3o6b“

TC SHC Kw

363 43 ' 379
347 43 8 379

453

338

460 331 44.7

417

373
429 359
442 340 46 4

365

424

348 48 0 372 292 42 1
432 336 48.7

371 48 9

357

353
375 368

1! .T C F M

TC SHC

375 268

374

44 2 374 277

47.2 374 277 40.4 424
368

47 7

368

48 5 362 278 43 4 388 319 46 2 388

362

49.3

53 4 348 275

AL UNIT

. .... —

Kw

TC SHC

37 0 414

268 37.0 421

407 312 40 9 421 337 42 2 424

38 7

38 7 422

273 38.7

277 40 4 421 307

277 41 9
277

278

CFM

429 306

40 4 400 317 42 4
40 4 409 315 43 1 420
40 4 417 310 43 7 429 320 45 3 438

398

41 9 405 311 45 2

410 308

43.4 393 312 46 8 399 329 48 4 402 345 49 5

46 6

363 311 50 2 363

-

12,000

Kw

307 39 5
304

308

304 44.3

317 44 6

431
443

39.9

41 5

432 327 42 9 437 336

41 9 439 320 43 4 448 326 44 2

42.1 445 316
411 344

44 0 435

439 306 46.2 454
404

414

45.6 417

14,000

Outdoor Air Cfm

“6 ''

TC SHC

382 283

42.2 382 283

44 4

379 287
379 287

44 7

377

45 3 377 291

377 291 40 5

47 0 377

47.5 377 291 40.5
47 1

372 292 42 1

372 292 42.1 417
367 293 43 6 397

49.6 367 293 43.6

52.2 361 293
53 9 354 294 46 9

37 4

37.4 428 319 40.2 449

287 39 0 412 327 41 1
287 39 0

39 0 427 325 42 1

39.0

291 40 5 405 334 42 6

40 5

291 40 5 426 324 44 2 444 336

45.3 389 329 49.3 393 345

К w

1000 2000

TC SHC

418

421 326 41 7 439 346 43 1

434

414
423 328 43 9 439 344 45.6

430 323 44.5 448 330
406 336 44 9 414 360 46 4

412 331 45 5 423

401

373 333

Kw

321 39 6 437 346

429 356 42 4 434 374

448

50 5

454
420 365

407 352

374

326 42.4

332 43 3 429 356 44 7

329 45.9 429
340 46 5 398

334 47.1

TC SHC

TC SHC Kw

^ ^ ..

-

—

3000

Kw

TC

SHC Kw

329 40 7 438 342 41 3

41.4

320

334 44 4

311 45 9 447 316 46 9

337
325 46 9 420 337 47 9
315 47.5 429

341

324
334 52 1 369

452 325 42.1

352 42 9

43.8 455 319 44.6
411

43 6

46.0

47 7 387 360 48 7

50 8 392 342 52 1

361 44 5

423 346

328

308 47.3

404

353 47 0

325

358 53 6

—

3000

TC

SHC

40 9 445

337 41.6 459 347

342

43.7 457

44.0

339

43 9 424

46 1 454 339

46.4

47 2

348
340

47.6

364

480

48.8 411 369

51.3 402

357

52 5

363 41.5

448 359 43 9

349 44.5
344

465

385 44 8
436 371
447 352

459 331
417

377
429

360 48 1
435 348 48.8

399

382

364 52.4
381 377 54 1

-----------------

43 6

45 2
46 2

48.5

Kw

42.4
43 2

44.8

45 5
46 5
47 2

47.6

47 3

49 1

49.8

--

Kw — Compressor Motor Power Input

SHC — Sensible Heat Capacity (1000 Btuh)

TC — Total Capacity (1000 Btuh)

NOTES: 1 No values are given where unit cannot maintain the assumed room

design relative humidity since the moisture content of the air leaving
the unit is higher than the assumed room moisture content

2 Ratings are gross and do not include fan motor heat deduction

40

PERFORMANCE DATA

Room Design 80 F/50% Rh

COOLING CAPACITIES

48MA/50ME040

#

OUTDOOR

AIR

TEMP

Wb

Db

65 378

85

70 378
65

70
73
75

65
70

95 75

78

80

70

100 75

78
70 368 263 43 7

75
no 78
115 75

— — —

0

TC SHC

377
377 259
377 259
377 259 38.8 431

376
376 262 40 5
376 262 40 5
376
376 262 40.5 429

372 263 42 1
372 263 42 1 412
372 263 42.1 418 295 45.9

368 263
361 262 45.3 394
354 261 46.9

Kw

256

37.1 417

256 37.1 424 288 40.0
259

38 8
38 8
38 8

262 40 5

40 5 426

262

43.7

UU 1DUU K

AIR

TEMP

Wb

Db

65

85

70

65

70

73

75 382 271 39.0

65 380

70 380 274 40 6 420 317 43 5
75 380 274

95

78
80 380 274 40.6 437 309 44.7

70

100 75

78
70 375

75

0 1000 2000

TC SHC

384
384

382 271 39 0 417 312
382 271
382

380 274

377
377 277 42 4 419 317

377

375

Kw TC SHC Kw TC SHC

37 5

268

37.5 431

268

39 0

271

39.0 432 310 42 3 453 328 43 8

274

40 6

40 6
40 6

277 42 4

42.4 427 316 46.3 441 331

277

44 2 402

280
280 44.2 410

no 78 368 279 45.7

115

360

75

47.2 389 325

278

TOTAL UNIT CFM

inooo

Outdoor Air Cfm

1000

Kw TC

SHC

TC

292

39 5

411 297
419
425 292

405 302 42 6
413
421 295

404

395 304 46 3
402 300 47.1 408

377 301

—

422 305

425 311

436 309 42.4 462 326
412

428
433 311 44 5 455 325 46 3 466 330 47 4 380 278 40 5 437 320

411 321

403 321

41 1

293

41 6

42 0

292

42.2

298 43 1

43 8

292

44 2

290 44.4 450

301 44 7
297

45 4

297 49.3 399 315

50 5

- •

13,000

Outdoor Air Cfm

39 7

40.3

304

41 3
41 9 445

42 9 427 352 44 3

318

313

44 1 448

45 0
45 7 433

324

46 6

322 47.4 419 344

49.6 408 339

50.9 389

2000 3000

Kw

SHC

434 314
446 304

425 322 42 3 429
436
445 306 43 5
453 303 43.9 460

416
427 319 44 5 431
438 308 45 5
446 301 46 1 455 305

413
423
431

399 331

376 327 52 4

--

-

441 332 41 1
454

434

436 342

461
424

412

40 8

41.5

312 43 0 444 323 43 8 380

330 43 8 418

295

46.3 463

325

46 2

313 47 1 429

306

47.6 438 315 48.8 375
47 9 399

319

48.8 413

51.1

— —

К w

323

41.8 465

342

42 7 440

332

43 3

44.1 474 332 45.1 383 275 39.0 439

44 8 443 359 45 7 380 278 40 5 423

332

45 8 457

319 46.7 472 322 47.9 380 278 40.5 440 318 44.8 465 331 47.0 476

349

46 6

338 47 5

47.9 449

356

48 3

49.2 423

51.5

352

52.8

SHC Kw TC

TC

327 41 3

440
456 312

454 313 44 4

444 316 46 5 379 269 40 6 425 305

414 343

406
377 351 53 9

TC

448

454 346 44 1
464

432

426 367 47 5 379 284 42 5 414 330 45 2 429 359 46 7
440

412 376 49 4 378 289

415 359
390

42.3 381

338 43 0 380

306

44.8 380

350 44 6 379 269 40 6 409
335 45 3

47 2

297 47.6 379 269 40.6

47 1

326 48 1 375 270

48 9

352
336

49.8

335

52.3 365

TOTAL UNIT CFM

3000
SHC Kw TC SHC

347 41 6
333

42.6 387 278 37.6 435 310

360 43 3

337 44 7 383 275 39 0 435 320

374 45 0

342

46 8 380 278 40 5

351 48 5 379
340 49.1 379 284 42.5 429 325

361

50.2

52.6

374

54.3

0

”Kw

SHC TC SHC

263 37 4

381

263 37.4 427 296 40.1 451
266 39 0 415 305

266 39 0 422 302
266

380

266 39.0 433

269 40 6 417

379

269 40 6 430 302

379

270 42 3

375

270 42.3

272 43 9 399 316 46 4 406

371
371 272

271 45.5 399 310

358 270

0 1000 2000 3000

278 37 6

387

275 39 0

383

275 39 0

383

380 278

284 42 5

289

378

371 287 45.9 408 332

286 47.4 394 337 , 51.0 394 363 52.9

363

421

39.0 429 302 42 1 449 319

434
408

42 3 416 309 45 6 429

424 307

43.9 407 312 47.3 414 332 49.0

47 1 384 314

Kw

TC SHC

422

418 320
429 320

40 5 414 327 42 9

431 321 44 2

422 326

44 4

405 333 46 7

44.4 413 331

12,000

Outdoor

Air Cfm

1000

Kw

TC SHC

39 7

300

302 42.3 459
3n 42 8 ^423

308

300

312

311 39 7 444

316 42.5

326 43 7

438

41 2

431

41 7

442

43 3

433
44 0 444
44 4 452

44.6

456
44 9

419 338

46.2

437 319 47.8

49.5 404

384

50 7

14,000

Outdoor

Air Cfm

Kw

40.5 457 331

41 3

437 351 42 8 444 370 43 4
42 1

448
42 5

456 337

464

430

440

451

44 7

458 335

45 9

438

46.4

446

47.5

49.7

TC

418
425 355

413

2000

Kw

324 41 0
314

334 42 5
323 43 2 450

317 44.0
343

332
322
314 46 2
308 46.5

327 47 4

344

328
340

SHC

340

342 43 4

336 44.2
362

352 45 0
343 45 9

349 47 6
342 48.1 454

367 48 3

351 51.7

445 338

41.7

462 324
436 351 43 1

43 7

44 1

428

44 7

438 348 45 5

45 7 452

46 4

48 1 406 364 49 2

51.4
52 7 384 363 54 1

— —

Kw

41 2

41.9

43 9

44 4

46 4

49.3

3000

TC SHC Kw

460
469 320

462
468 310 47.8

421
435 339 48 3
444

418
410

TC

452 356
468

458 356
467 348 44 9
478

437 385 45 1
448 370 45 8
461
470

432
444 363 48 6

418
428

419 370 52.7

396 385 54.5

41 5

42.5

336 44 0
326 44 6

45.0

364 44 8

46 7

330

47 3

318

356 47 4

328 49.0

349

50.0

347

52.5

SHC К w

41 7

342 42.7

44 2

344

45.2

354 46 9
342 47 5
334

48.0

379 47 7

352 49.2
387 49 6

373 50.3

Kw — Compressor Motor Power Input

SHC — Sensible Heat Capacity (1000 Btuh)
TC — Total Capacity (1000 Btuh)

NOTES: 1 No values are given where unit cannot maintain the assumed room

design relative humidity since the moisture content of the air leaving
the unit is higher than the assumed room moisture content

2 Ratings are gross and do not include fan motor heat deduction

41

FAN PERFORMANCE

The procedure for determining required fan
speed (rpm) and shaft horsepower for a 48MA (or
SOME) unit is described below.

Since the various unit zones operate at different
air quantities and different external resistances, it
is necessary to identify the zone having the highest
static pressure requirement for the supply duct and
supply outlet.

Usually, the longest duct run to the last outlet,
with the greatest number of offsets and elbows, has
the greatest static pressure requirement. Assume
that a duct friction analysis has been made and the
cfm and static pressure are as follows:

Zone No

1

4
5
6
7 1440 5 2 720

Totals

CFM ESP (in wg) No Modules

2
3

720
1080
1080 5
2700 6

900 4 1 900
1080 4

9000 10

6
8

CFM/Module

1 720
1
1
3

1

1080
1080

900

1080

The total unit cfm is 9000. Zones 4 and 7 have 3

and 2 modules, respectively, “

comply with the limitation

ganged” together to

of 1200 cfm per

module.

The cfm for zone 2 is 1080 with an ESP of

.8 in. wg. This module appears to possess the
highest friction loss. Therefore, the main fan static
pressure is established at .8 in. wg ESP.

Enter Tabled fan performance at 9000 cfm,

.8 in. wg ESP and read: 1070 rpm and 5.7 bhp.
The 028 indoor fan motor data shows the standard

lOhp motor with a maximum bhp of 11.5.
Therefore, 5.7 bhp for this selection is satisfactory.
Two pulley selections are available with the 028:
Pulley A, shipped mounted; Pulley B, shipped in

the blower compartment. Pulley A has a fixed

pitch and at 1095 rpm is close enough to the
required cfm and should be used. Pulley B at

1230 rpm allows selection of the unit at higher

cfm’s and static pressures. (See Table 1.)

Pulley Selection — In general, for start-up, the

pulley producing an rpm higher than required but
closest to the required speed should be used. If this
results in excess air being delivered, a locally
supplied pulley that produces lower air quantity
should be used. Two pulley selections are provided
with each motor and cover most application
requirements.

Balancing Dampers — As in any multizone

application, suitable balancing dampers should be
provided in each zone duct run. Normally, a
2-bladed damper is preferred to a single blade. For

the selection example, balancing dampers should
be adjusted (by the installer) to give the desired
airflow and static pressures in each module. Ready
access to balancing dampers is a major considera
tion when designing a multizone system. In a T-bar
ceiling, this is not a problem. In a plastered ceiling,
an access door at the damper location is required.

Low Cfm, Long Run Zones — Small zones with

long runs can cause problems in any multizone
system. As the cfm decreases at a given duct
velocity, the friction loss per 100 ft increases
significantly. Also, seam and joint leakage in a
small duct of long length can prevent delivery of
required cfm at the outlet grille.

Long ducts with low cfm should be oversized to
give lower velocities, lower friction rates and
reduced leakage rates. Recognition of the charac

teristics of small ducts and proper design of such

runs will avert potential problem areas.

In addition to the fan performance table, fan
curves (Fig. 32, 33, 34) have been included for
easier interpolation and fan selection at rpm’s and
static pressures not shown in the fan performance

table.

42

Table 4 — Fan Performance

FAN PERFORMANCE

UNIT
48 M A/
SOME

016
and
024

028
and
030

CFM

5.000

6.000

7.000

8.000

9.000

9,600

7.000

8.000

9.000

10,000

11,000

12,000

7.000

8.000

0.2

740 805

820

3.9

900

-

960

6.4

980

S-Î

1065

6.3

1150 !

' a.o '.]'.

1 " " - ' f

EXTERNAL STATIC PRESSURE (in. wg)

0.4 0.6

705

760 820 900 955

0.8 ] 1.0 ~J 1.2 [ 1.4 1[ 1.6

740 810 880 955

3.2

880

4.4

980

5.9

1030

7.Î

'880

3,8

970

.3.0

1040

1090

7.8

960

4,2

1020

1100

7 2

1150

3.3

I ' 945 I '995 i 1040 |

960.

1040

s.s

1115

7.0

1200

'9,0

r 950

i 1

1015

5.C

1090

6,3

1170

7.7

1240

10.0

1000

' 5.0

1070

5,7

1140

6,9

1210

3.7

1290

u.o

I 930 i '960' i;'990 r 1030, I 1060 I 1100

-L

900 940 975

3.0

1020

4.7

1080^

6,i

1160

7.9

1205

8.9

1050

1120

6,3

T180

7.6

1255

9,7

1

Fan Rpm

Shp

3.0

1020

4,1

1070

1130

5.2

1 145

6.7

1215

3.5

1255

9-5

i.

1100

5.7

1170

6,9

1 230

S.4

I 1300 1 -

rio.s r -

1010 1040

1020

1070 1120

3.0

1070461130

1190

5,S

1200

7.3

1265

4,7

1090

5.2

1150

62

1210

1280

9.3

7 5

.’.250.

1130

5.8

1190

6.9

1250

8.3

1070 ino I 1155 1200-

5.1

6.2

8.0

i ' "1

1.8

1

4,4

1180

5.6

1235

7.0

1300 I

£2 !

1180

6.5

1230

7.5

1295

9.3

1170

4.9

1225

6.2

1280

7.7

1220

7.0

1270

S-Î

I 1220

■i

.......

I 1140

1__=„

2.2

1270

6.S

-■

1260

7,6

9,000

034

and

040

10,000

11,000

12,000

13,000

14,000

NOTES;

1 Italics indicate higher horsepower motor is required Units 016

and 024 are shown in the same table Underlined italicized values
apply to 024 only Units 016 and 024 may use 10-hp 215T
(NEMA frame size) motor A larger motor may not be installed
in units 028 and 030 Optional 20-hp motor for units 034 and 040
has 256T frame Motor drives on units 024, 028 and 030 are
interchangeable to permit fan operation above or below standard
fan speeds

2 Maximum fan motor bhp is based on conditions of minimum

voltage and 80 F air across motor

3. Fan performance has deductions for unit casing, wet coils, heaters
and clean filters.

4. Cfm range per module is 600 to 1200 cfm. Lower flow volumes
are permissible if only first stage of heat is operated. Volumes
above 1200 cfm may cause water blow-off during cooling.

900

970

-

1045

- 1

1130

11.-2

1210

131511345 !

Ì7J

930

1000 1

1

“ 1

!
1

1080 1

— \

1

1160 1 1195

1

1'5.9 i

1

,1.250... I_

34,5

Ji±l

J-

960

1030

1000 1030

!

1070

- 1 -

1115[1150

9,9

30,6

I

1

1230

12,6 33-,2

1

.1.2.00...

T5,2

1370

18,8

t
1

1

1325

1.6,0.

1400

i

1105

i
1

1180

1Î.8\12.3Ì

r
1

1260

1

•4.0

1.350.

i

37.0

1

1435

2‘X:>

±JiÀ.

1070 1105 1145 1190

1 1 145
1

■98

1 1220

!

1295

14.7-

Ì
1

,1.3.80,

T

U.B'

1 1460

UNIT
48 MA/ MAX BHP

SOME

016 5.75
024
028
030
034
040

‘Field Supplied

1180 1 1210

1

\

30.5 \

1250 1 ' 1280

1

V3.0- 1

>

1330 1 1360

1

• ■•••

Î5.8 1

J40G

-i.

1

1485 1 1

f

2Z.8 i

_L

INDOOR AIR FAN MOTOR DATA

MOTOR

Std

8 60
11 50
11 50

22.8 1095 1230 1320 1425

17.25

17.25 22 2 1095 1230 1320

Opt

_
—

\

*
*

11.2

33,8

36.2

..1.4.3Q..

39,2

Std Motor

Pulley A

880 995

995
1095
1095

1220

9.9

1250

1

32,1

<■

1320

1

14,5 f 15.3 3

\

1390

1

37.3

r-

1

.1460

26,3

­«

i

FAN SPEED (Rpm)

Pul ley B Pulley A Pulley B

1145

1230
1230

lO.S

1 1280 !
i 33.0 ] 34.0
1 1350 1

1 1420 1

f- .36.2 f

1 1480 1

1 23-6 1

1 - 1

L_.r 1

Opt Motor

_

_
_

—

1250

r.,3

1320

1380

l6-5

1445

39.6

...

1425

_
_
_

-

43

pp

INCHES H20 EXTERNAL STATIC PRESSURE

BRAKE HORSEPOWER

INCHES H20 EXTERNAL STATIC PRESSURE

<jt b

to

CO
CO

03

3

T3

(0

3

03

3

o

m

s

i

00

BRAKE HORSEPOWER

^ o> 00 o

>

o
m

s

00

o

CO

o

30NviAiaoda3d wvd

*

O

<

cc

FAN PERFORMANCE

</>

V)

o

z

6000

8000

10000 12000

CFM-STD AIR

Fig. 34 - Fan Performance, 48MA/50ME034,040

14000

45

HEATING PERFORMANCE

Table 5 — Electric Heater Performance

UNIT

48MA

016
024
028 600
030
034
040

Total

UNIT

SOME

016

&

024
028 75

HEAT TO

COOL RATIO

.75 1 53

1

1

1.5 1 106
1 66

& 1 1

030 1.5 1

034 .75 1

& 1 1

040

1 .5

1

Table 6 — Gas Heating Capacities (1000 Btuh)

INPUT BONNET CAPACITY

Each

Zone

Module

480 60
480 60

60
600 60
720
720

60

60

Total

360
360

450

450
540
540

Each Zone Module

HEATER KW

Stage 1 Full

22.5

22.5

45
45

22.5 45
22 5 45

22 5
22 5

45
45

TOTAL

70

88

132

79
106
158

STEPS OF HEAT

PER MODULE

2
2
3

KW/STEP

PER MODULE

3 3

4.4

4.4

2 3.3
2
3

4.4

4.4

2 3.3
2
3

NOTES:
1 Ratings are approved for altitudes to 2000 feet 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
calculate air temp rise:

. bonnet capacity

At =

----------------:--------------

3. At altitudes above 2000 ft, the following formula may be used:

4. Maximum allowable gas pressure is 14.0 in wg

5 Unit design is A G A certified

1 09 X air quantity

_

______________

( 24 X specific weight of air x 60) (air quantity)

Minimum allowable gas pressure for full rated
input is 5 0 in wg

bonnet capacity

4.4

4.4

_____________

46

1 Determine zone module air quantity as described in the

Selection Procedure (1000 cfm)

2 Enter curve at determined zone moduie air quantity Project left

to intersect with entering air temperature curve (70 F)

3 From this intersection, project up to intersect with entering

water temperature (180 F)

4. From this intersection,project right to intersect with Water Flow
Rate (4 gpm).

5 From this intersection, project down to read Zone Module

Fleating Capacity (49,500 Btuh)

Fig. 35 — Hot Water/Glycol Heating Capacities (Hot Water with 20% Ethylene Glycol Solution)

When using soiution mixtures above 20% glycol concentration,
reduce the capacity using the correction factor

i e If 30% glycol concentration applies to the example,
Corrected Zone Module Fleating Capacity

= Zone Module Fleating Capacity x Correction Factor
= 49,500 X 0 985
= 48,750 Btuh

See Fig 36 The Ap at 4 gpm is 8 2 psig

Fig. 36 — Module Pressure Drop

47

ELECTRICAL DATA

Table 7 — Electrical Data, 48MA

UNIT

MODEL

48MA016

48MA024

48MA028

48MA030

48MA034

48MA040

FLA
LRA

CBMTA -

VOLTAGE

V-PH-HZ

200-3-60
230-3-60 207 264
460-3-60 414
575-3-60

200-3-60 180 229
230-3-60
460-3-60 414 528
575-3-60

200-3-60 180 229
230-3-60 207
460-3-60 414

RANGE

Min Max FLA LRA MTA LRA

^ ■ -j

180 229 63.6

57.2
28 6

528

22.8

660

518

44.4

207 264

40.0

19 9

15.7

660

518

63.6

57.2

264

28.6

528

575-3-60 518 660 22 8

CÔMPRES!

186/266
168/240

>6r

NO. 1

44 5*

40.0*

120 40 0

96 32 0

170
153

62 0

56.0 40 0

77 27 8 19.9

22.0

62

266
240
120

89.0
80 0 40 0

40.0 19 9

96 32.0

200-3-60 180 229 63.6 266 89.0
230-3-60

460-3-60 414

575-3-60

200-3-60 180 229 63.6

230-3-60 207 264 57 2

460-3-60 414 528

575-3-60

207

518

518

264
528
660

57 2

28.6 120

22.8 96

240 80.0

41.0
33 0

266

89.0

240 80 0 57 2 240 80 C 6 2 6 0 6 0 1 1

28 6 120 40 0 28 6 120

660

22.8

96 32.0 22 8 96 32.0

coi

1PREÎ

>SOR

NO. 2

CB

MTA

_

-

— _

- _

- - - 6 2 24

44 4 170 62.0

153 56 C 6.2

77 27.8 6.2

15.7

62 22.0

170

44.4
153 56 0 6 2

77 27.8 6 2 3.0

15.7

62 22 0 6.2 2 4

63.6

266

57 2

240

120

28.6
96

22.8

63 6 266 89 0 6.2 6 6 6.6 1 1

200-3-60 180 229 80 C 332 112 0 80 0 332 112 0

230-3-60

207 264 77.0 300 109.0 77.0

460-3-60 414 528

575-3-60

-

Part-winding/full-winding start

Full Load Amps
Locked Rotor Amps

Circuit Breaker Must Trip Amps

518

660

.

38.5 150 54.0

31 4 120

44 0

, . —

38 5 150 54 0

31 4

109 0

300

120

‘Unit has 2 mechanically interlocked circuit breakers. Values are for each.
NOTES:

1 Combustion air fan — 115 volts

2. Outdoor fan motor is a 200/230-1-60 motor on all units.

OUTDOOR FAN

CB

_

MOTOR FLA

No. 1

6.2 6.6

No. 2

6.2 6.0

6 2 3 0

6.2 6.6

6.0
3 0
2 4

6 2

62.C

6.2 6 6

6.0

89 0

6.2 6.6 1 1
80 0
41 C

6.0

6 2
6 2 3 0

33 C 6 2 2 4

6 2

3.0 3.0

2 4

40.0 6 2

6.2 6.6 6 6 1 1

6 2 6.0

6 2 3 0 3 0

44 5

6 2 2 4 2 4

COMBUST

MOTOR

No. 3

_

_

_

_

_

-

—

-

_

—

-

-

_

—

-

2 4 1.1

6 0 1 1

INDOOR

FAN

FLA

1.1 5 0

1 1 5 C

1.1 5 0

1.1 5.0
1 1

FAN

MOTOR

FLA

Hp

16 2

13.2
6 6

5 6

7 5 24 0

1.1 7.5 22.0
1 1 7.5

11.0

1.1 7.5 9.0

n

10.0 29.6~

10.0

25 0

10.0

12 5

10 0

9.5

29 0

10.0

25.0

10 0

12.5

10.0

9 5

15.0

45.0
60 8

20.0

15.0

38.6

20.0

51 4

15.0

19.3

20 C

25.9

15 0

15 4

20 0

20.0

, ______

15 0

4s¥

20 0

60 8

15 0

38.6

20 0

51.4

15.0

19 3

20 0

25 9

15 0

I5I

20 0

20 0

1.1

1.1

1.1

1.1

1 1 10 0

1.1
1 1

1 1

1 1

POWER SUPPLY

Min

Wire

Amps

109 6

99.5

Max

Fuse

Amps

125”

no

49.8

39.8

’b7.5~

124.8

150"'

150

62 2

49 4

'i687r

152.3

■ 200 "

175

76.1
60 4

Ï87 3

169.5
84 2

' 200 ‘

200
100

67.5

tTcTs

224.6

■ 225'

250

18879”

200 9

94 5"

100 5

75 6
80 6

2477.7

261.5
233 5

245.5

122.7

250

~ ioo”'

125
”'90”

100

”'30*0”'

300

300"

300

150

9s7o

100 0

125

60
45

70
60

90
70

90

150”'

125”

48

Table 8 — Cooling Electrical Data, 50ME

ELECTRICAL DATA (Contd)

UNIT V-PH-HZ

200-3-60 180

50ME016

230-3-60 207
460-3-60
575-3-60 518 660 22 8 96 32 0

200-3-60 180 229

50ME024

230-3-60
460-3-60

i 575-3-60 518

200-3-60 180

SOME 028

230-3-60

460-3-60

575-3-60 518
200-3-60

SOME 030

230-3-60 207 264 57 2
460-3-60
575-3-60 518 660 22 8

200-3-60

230-3-60 207 264 57 2

S0ME034

460-3-60

575-3-60

—

200-3-60 180 229 80.0

230-3-60

SOME 040

460-3-60

575-3-60 518

VOLTAGE

RANGE

Min Max

229 63.6

COMPRESSOR

FLA

'Ì86/266

NO. 1

LRA

264 57.2 168/’24G

414

207

414

528 28 6

44.4
40 0

264

19.9

528

Ì20 40 0

170 62 0
153 56.0

77 27.8 19 9

660 15.7 62

229

^ól^ó
207 264 57.2
414

528 28.6
660

22 8

266
240 80 0 40.0 153 56.0 6 2

120 40 0 19 9 77 27 8 6.2 3 0

96 32 0 15 7 62 22 0 6 2

180 229 63 6 266 '

240 80 0

414

528 28 6

120

96 33 0 22 8 228

180

229 63 6

266

240 80 0

~

414

518

28 6 120

528

660 22 8

96 32 0 22 8 96

“

332 112 0 80 0 332 112 0 6 2

207 264 77.0 300

L. . _

414

582 38 5

660 31 4

150

120 44 0

compressor“

NO. 2

.........

CB

MTA FLA LRA

44 5*
40 0*

— — —

- —

CB

MTA

- -

- - -

44 4 170

40.0 153

22.0 15 7
89 0

44.4 170 62 0 '62"

89 0 63 6 266

57 2

41 0

28 6 120

62 0
56 0

77

27 8 6 2

62 22.0

' 39 0

240 80 0

41 0

33.0

89 0 6 2

57 2

266

240

80 0

89 0 63 6

- ­40 0 28.6

120

40.0

32 0 6 2

109 0 77 0 109 0 6.2

54.0

300

. ------„ -

38 5 54 0 6 2

31 4

-----

150 3 0 3 0

120 44 0

OUTDOOR

FAN MOTOR

No. 1

6 2

6.2
6 2

6.2
6 2

6 2

6.2

6 2 6 6
6 2 6.0
6 2

6.2 2 4

6 2

6.2

6 2

FLA

No. 2 No. 3

6 6
6 0
3 0
2 4

6 6

_

6 0
3 0

2.4

-

6 6

6.0

2.4
—

3 0

6 6

6 6

6 0

6 0

3 0

3 0

2 4

2 4

6.6 6 6

6 u 6 6

_ ..

2 4 2 4

INDOOR ■'

FAN MOTOR

F LA

HP FLA

-

5 0 16 2 109 8 125

-

5 0 13.2

-

5 0 6 6

5 0 5.6

­7 5

7 5

POWER SUPPLY

24.0 138 0 150

22.0 124 0

- 7 5 11.0

7 5 9 0 49 2 60

-

10.0 29.0 168 9 200

-

10.0 25 0 151.7 175

-

-

12.5 75 8 90

10.0

10.0

9.5 60 2 70

10.0 29.0

-

10.0 25.0 168.9 200
10 0

12 5

10 0 9 5 67.3

-

45 0

15 0

60.8

20 0
15 0 38 6

20 0 51 4
“l5 0

25.9 100.5 125

20.C

15.0

15.4

20.0

20 0

15 0 45 0
20 0 60.8 261.5

15 0

38.6

51.4

20.0

- — —

15 0

19 3 116 7 150

233 5

245.5 300

20 0 25 9 122 7 150

15.0

20 0

15 4
20 0

100 0

Wire

Amps

89.8

Max
Fuse
Amps

no

49.5 60

39.6

45

150

61.9 70

188 0 200

84 5

100

90

210 8 225
224 6

188 9

250
200

200 9 250

94.5~ lOO"“"

75.6
80 690100

247 7

300

300
300

--------

95 Ó

125

125

Part-winding/full-winding start

FLA — Full Load Amps

LRA

Locked Rotor Amps

‘Unit has 2 mechanically interlocked circuit breakers. Values are for each.

NOTE:

Outdoor air fan motor is a 200/230-1-60 motor on all units.

49

ELECTRICAL DATA (Contd)

Table 9 — Electric Resistance Heater Data

HEATING
ELEMENTS
PER ZONE

MODULE

„ --------

FULL LOAD
AMPS PER

HEATING

ELEMENT

16 5

14.4
7 2

22.0

19.2
9 6

22 0

19.2
9 6
7 7

16 5
14 4

7 2

22 0

19.2

96 45

22 0
19 2

9 6
7 7

16 5
14 4

7 2

22 0
19 2

9 6

22 0

19.2

9.6

7 7

...

CB MTA

EACH AMPS
ZONE

MODULE

52 225
52
45 100

52 300
52
45

52 200
52
45
45 150

52 250
52
45

52 350
52

52 250
52
45 225
45

52
52
45

52
52
45

52 300
52
45
45

------

-

--------

MAX FUSE

EACH

CIRCUIT

200

250
125

175

175

225

125

300
175

225

175
300

250

125

200

175
150

250
250
200

MIN WIRE

AMPS

EACH

CIRCUIT

215.0

187.0
94 0

287.0

250 0
125 0

190 4

165.8

165 8

132.5

250 0
218 0
125 0

334.0

292 0

167.0

238 0
207 0
207 0
166 0

286 4
249 6
124 8

190 4
165 8
132 5

285 6
249 6

249.6

199.2

C8 MTA — Circuit Breaker Must Trip Amps

NOTE; Terminal boards provided for heater power wire connections
are suitable for use with copper or aluminum wire.

50

Where a single feeder is to be used, the cooling power tap may be

sized according to the Cooling Minimum Wire Amps shown in

the Power Wiring Data, Table 1 0, provided the tap is 10 ft or less
in length and enclosed in a raceway
Similarly, the heating power tap may be sized according to the

Heating Minimum Wire Amps shown in the table provided the

tap is 25 ft or less in length and enclosed in a raceway

If reheat is necessary for humidity control in all or part of the

modules, use caution in sizing common feeder as heating and

cooling can occur simultaneously in each reheat module

3.

For 200/230 volt units, line protection is internal to the unit
For 460/575 volt units, overcurrent protection must be provided

in each power tap per NEC

Fig. 37 — Common Feeder Wiring

51

ELECTRICAL DATA (Contd)

Table 10 — Power Wiring Data

UNIT

VOLTS

(Nom)

200 53 109 8 215.0
230 53 98 9 187 0
460

200

50ME016

230
460 70 49 5

200
230
460
575

200 53 138 0
230
460

200

50ME024

230 70 124 2
460 70

200
230
460
575

200
230
460 66 75 8 125 0

200

50ME028

230
460

200
230
460 132 75 8 207 0
575

200 66 188 0
230
460 66 84 5 125.0

200 88 188.0 334 0

50ME030

230
460

200
230
460 132 84.5 207 0
575

IFM — Indoor Air Fan Motor

KW

(Unit
Total)

53 49 5 94.0

MINIMUM WIRE AMPS

Heating

Cooling

Circuit
1 2 1 2

_

-

-

70 109.8 287.0
70 98.9 250.0

125 0

109 8

106

190 4 190 4

_

-

106 98 9 165.8 165 8
106 49 5 165 8
106

39 6

132 5

215 0
53 124.2 187.0
53 61.9 94.0

70

138.0 287 0
250 0

61 9 125 0

106
106
106

138 0
124 2

190.4 190 4

165.8 165 8

61.9

165.8 176 8

106 49.2 132.5

66 168 9 250.0
66 151 7 218 0

-

-

-

-

-

—

-

-

-

-

-

-

88 168 9 334.0
88 151 7 292 0
88 75 8

167 0 - 181.0

-

-

132 168 9 238 0 238 0
132 151.7

132 60 2 166 0

207 0

207 0 442 0

-

-

250 0

66 168 9 218 0 277 9

-

-

168 9

88
88

84 5

292 0

167.0

132 188 0 238 0

132 168 9 207 0

132 67 3 166 0

-

—

-

-

-

1 */ * ' K

11" IVI

1 r IVI

it) np

IFM

20 Hp

15 Hp

IFM

20 Hp

IFM

VOLTS

(Nom)

(Unit

T otal)

200
230

460

200 79 224.6 286 4

460
200

230 106
460

200 106

460 106

9nn
230

460 158

575 158 75.6
200 158

230
460 158
575 158

200 79
230
460

200
230 79 245 5

_ UNIT
Lrommon

232 5
202 2

101 6

304 5
265 2 230 79

132.6

398 3

346.8

173.4
138 6

---------— 50ME034

245 5 230
217 7

108.9

312 3

275 3

136 0

406.1

353 6

141.8

293 9
260 7

139 0

366 2
320 0

460 79 122 7

508 2 200 106

221 0

183 0

313 0 50ME040

147 0

366 2 15 Hp
320 0

181.0

508 2
444 9 20 Hp

222 5 IFM

183 0

1 lip

11” M

20 Hp

1 r IVI

IFM

230

460 106

200 106 261 5
230

460

200 158
230 158 233 7
460 158 116 7
575

200 158
230 158
460 158
575 158

KW

79 210 8 286.4

MINIMUM WIRE AMPS

Heating

Cooling

Circuit

_

Common

354.0
79 188 9 249.6 313 7
79 94.5 124.8

200.9

79 100.5

106 210.8 190 4

106

106

249.6

124.8

188 9 165 8

94 5 165 8

224 6

190 4

200.9 165 8

190.4 429 1
165 8 374 8

100 5 165 8

158
158

210 8

285 6 285 6 619 5

188.9

249.6 249 6 541.2

94.5 249 6
199 2

224.6 ^285 6 285.6

158 200 9 249 6 249 6

156.8

-

_

367 8

-

325.7

162.9

-

187 4

-

190.4

442 9

165 8 385.6

192 8

-

-

270 6
216 2

-

633.3
553 2

100 5 249 6 276 6

80 6 199 2

247 7

286 4
79 233 5 249 6
79 116 7 124.8

79 261.5 286 4

249 6

124 8

106

247 7

233.5

190 4

165.8 165 8

116 7 165 8

190 4

245 5 165 8 165 8

106

106 122 7 165 8

247 7 285 6 285 6

249 6
249 6

158

95 0 199 2

261 5 285 6

245.5 249 6 249 6
122 7 249.6

100 0 199 2

221 2

-

_

390 9

—

358 3

179.1

-

_

404 7

-

370.3

-

185 1

190.4

438 1
399 3

199.6

-

190.4

451.9

411.3

-

205 6

628.5

249 6

566 5

-

283 1

-

227 8

285 6 642 3

578 3

-

289.1

-

232 8

m

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Tab 6

Form 50ME-1 XA New

Printed in U S A

8-76

PC 111 Catalog No 515-002