Page 1
50DP,DPE012,014
50DP016,020
HEATING t COOLING
Single-Package Cooling Units
Installation, Start-Up and Service Instructions
CONTENTS
Page
safety considerations
installation .... 1_10
• RooFcto'S""
...........................
.
.................... • • • '
I
• alternate unit support
• p*ootTt”'9 Unit
• POSITIONING
• ROOF MOUNT
Q+fE c Nlake Unit Duct Connections
Fabricate Ductwork
c Trap Condensate Drain
m Make Electrical Connections
! POWER SUPPLY
CONTROL WIRING
Adjustments
Make Outdoor Air Inlet
............................................................
1 outdoor" AIR "dAMPE’r
• OPTIONAL ECONOMIZER
step 8 — Install Outdoor Air Hood
^"FART-UP
SERVICE..................................................................14-16
.............................................................
................................
.......................
.......................
.................................
.................
...........
.........................
10-13
1
6
6
6
7
...
10
SAFETY CONSIDERATIONS
Installation and servicing of air conditioning
ment can be hazardous due to system pressure ano _
trical components. Only trained and •
personnel should install, repair or service air condì g
equipment.
Untrained personnel can perform basic
functions of cleaning coils and filters and rep g
filters. All other operations should ^
trained service personnel. When working on
tioning equipment, observe precautions »of“® ^ r>rpl
tags and labels attached to the unit and other sal y p
cautions that may apply.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for unbrazing operations.
Have fire extinguishers available for all brazing
operations.
A WARNING
Before performing service or maintenance operations
on unit, turn off main power switch to unit. Electrical
shock could cause personal injury.
INSTALLATION
Step 1 — Provide Unit Support
ROOF CURB — Assemble and install accessory roof
curb in accordance with instructions shipped with this
accessory. Accessory roof curb and information required
to field fabricate a roof curb are shown in Fig. 1 and 2.
Install insulation, cant strips, roofing and flashing as
shown. Ductwork can be installed to roof curb before unit
is set in place. Curb should be level. Unit leveling toler
ance is ± l/16in. per linear ft in any direction. This is
necessary to permit unit drain to function properly. Refer
to Accessory Roof Curb Installation Instructions for
additional information as required.
ALTERNATE UNIT SUPPORT — When the curb
cannot be used, support unit with sleepers using unit curb
support area. If sleepers cannot be used, support long
sides of unit with a minimum of 3 equally spaced 4-in. x
4-in. pads on each side.
Step 2 — Rig and Place Unit — Inspect unit for
transportation damage. File any claim with transporta
tion agency. Do not drop unit, keep upright. Use spreader
bars over unit to prevent sling or cable damage. Rollers
may be used to move unit across a roof Level by using
unit frame as a reference; leveling tolerance is ± 1/16 in.
per linear ft in any direction. See Fig. 3 for additional
information. Unit weight is shown in Table 1.
Four lifting holes are provided in ends of unit base rails
as shown in Fig. 3. Refer to rigging instructions on unit.
POSITIONING — Provide clearance around and above
unit for airflow, safety and service access (Fig. 4).
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
g2°k|l |4 PC111
TabTlbl6b
Catalog No 565-104
Printed in U S A Form 50DP-26SI
ii.n,. Carrier Specified Parts.
Pgi
7-88
Replaces; 50DP-25SI
Page 2
Fig. 1 — Roof Curb Details
INDOOR AIR
FAN MOTOR
(50PQ900I5I )
INDOOR AIR
FAN MOTOR
TRANSITION DUCT
Fig. 2 — Side Supply/Return Curb Details
Do not install unit in an indoor location. Do not locate
unit air inlets near exhaust vents or other sources of
contaminated air.
Although unit is weatherproof, guard against water
from higher level runoff and overhangs.
ROOF MOUNT — Check building codes for weight dis
tribution requirements. Unit weight is shown in Table 1.
NOTE: Rig by inserting hooks into unit base rails as shown. Main
tain a distance of 120 m. (3048 mm) from top of unit to eyehook.
Use corner post from packaging to protect coil of unit from
damage by rigging cable Use bumper boards for spreader bars.
CAUTION!
All panels must be in place when rigging.
Fig. 3 — Rigging Details
t
©
Page 3
25% AIR OR ECONOMIZER HOOD
#
INDOOR AIRFLOW
0
• OUTDOOR AIRFLOW
F'9" 4 — Physical Data and Dimensions
> ALTERNATE AIRFLOW
SPACE REQUIRED FOR
B
SERVICE AND AIRFLOW
Page 4
Table la — Physical Data — 50DP,DPE012,014
UNIT SIZE
OPERATING WEIGHT (lb)
Unit (Outdoor Coil/Indoor Coil)
AI/AI
Al/Cu
Cu/Cu
Roof Curb
Economizer
Electric Heat 65
Alternate Motor and Drive 5
COMPRESSOR
Quantity...Type
Oil (oz)
REFRIGERANT
Charge (lb) Sys 1* Sys 2
REFRIGERANT METERING DEVICE
Upper Circuit
Quantity...Length...lD/OD (in.)
Lower Circuit
Quantity...Length...ID/OD (in.) 6.. 20...0.055/0 125
OUTDOOR COIL Copper Tube, Aluminum or Copper Plate Fins
Rows
Fins/in.
Aluminum 13.6
Copper 124
Total Face Area (sq ft) 18.9
OUTDOOR AIR FAN Propeller Type, Direct Drive
Nominal Cfm
Quantity...Diameter (in.) 2. 22
Motor Hp (1075 Rpm) V2 ’/2 'k
INDOOR COIL Copper Tube, Aluminum or Copper Plate Fins
Rows 2
Fins/in.
Aluminum
Copper 13.1
Total Face Area (sq ft) 14.7
INDOOR AIR FANt Centrifugal, Belt Drive
Quantity...Size (in.)
Nominal Cfm
Rpm Range
Max Allowable Rpm 1550 1550 1550 1550
Motor Pulley Pitch Diameter (in.)
Fan Pulley Pitch Diameter (in.) 5.5
Belt, Quantity...Type...Length (in.) 1 V. 41
Speed Change per Full Turn
of Moveable Pulley Flange (Rpm) Opt 63
Moveaable Pulley Max Full Turns
from Closed Position
Factory Setting — Full Turns Open
Factory Speed Setting (Rpm) Std 846
Motor Hp (Service Factor)
HIGH-PRESSURE SWITCH
Cutout (psig)
Reset (psig) 320
LOW-PRESSURE SWITCH (Liquid Line)
Cutout (psig)
Reset (psig)
_______________________
Std 753-1066
Opt 878-1191
Std
Opt 2.8-3.8 3 4-4 4 3 4-4.4 3 4-4 4
Std
Opt 972
Std 1 (1.25)
Opt 1’/2 (1.20) 3 (1.15) 3 (1.15) 3 (1.15)
50DP012
1180 1260
1230 1340
1280
2. .P64
76 ea 76 ea
7.9, 6.6 10.9, 12.5
7 .35 0 055/0 125 8 34.0.055/0 125 8.. 44. 0 065/0.125
2
9000
144
2 10x10
4000 4000 5000
2 4-3 4
62
3 5
AIR INLET SCREENS
Economizer, Number...Size (in.)
iNDOOR AIR FILTERS (Type)
Number...Size (in.)
‘System 1 consists of upper portion of outdoor coil and lower portion of indoor coil
fUnits have adjustable standard and alternate drives
2.16x20x2
4 .16x25x2
50DPE012 50DP014
1260 1470
1340 1550
1410
Hermetic — 2 Cylinders
1 P56, 1 P60
±
Capillary Tubes
7...20 .0.055/0 125 7...35...0.065/0.125
3
13.6 136 136
12.4
18.9 18.9 18.9
8000 8000 12,000
2. .22 2...22 2...26
3
156
14.2
13.8 13.8 16.5
2 ..10x10
805-1093 805-1093 805-1093
978-1265 978-1265 978-1265
2 8-3 8 2.8-3.8 2 8-3 8
6.0
1 V. 43
58
57
3
920
1092 1063
2 (1 15)
10% efficient — Disposable Fiberglass
2. .16x20x2
4 16x25x2
1410 1630
200
110
2. .P77 1 ..06DA328
76 ea 160
R-22
8 3, 8 4
3
12.4
3 3
156 14.3
14.2
2 .10x10
6.0
1 V. 43
58
57
35 3
891 920
2 (1.15)
428
27
60
2 .20x25x1
1...20x20x1
2.. .16x20x2
4.. .16x25x2
Semi-Hermetic — 6 Cylinders
50DPE014
6...25 0 055/0 125
6. 25 0 055/0.125
6 .25.. 0 055/0.125
2 .20x20x2
3 16x20x2
2.16x25x2
20.8
—
3
124
1
13 1
2...10x10
5000
6.0
1. V...43
58
57
1092
2 (1 15)
i
Page 5
Table 1b — Physical Data — 50DP016,020
UNIT SIZE 50DP016
OPERATING WEIGHT (lb)
Unit (Outdoor Coil/Indoor Coil)
AI/AI
Al/Cu
Cu/Cu
Roof Curb
Economizer
Electric Heat
COMPRESSOR
Quantity...Type
OH (oz) 160 160 ea
REFRIGERANT
Charge (lb) Sys 1*. Sys 2
REFRIGERANT METERING DEVICE Capillary Tubes
U|»er Circuit
Quantity...Length...ID/OD (in.) 6 40 0 065/0 125
Lower Circuit
Quantity ...Length...ID/OD (in.)
OUTDOOR COIL
Rows 3
Fins/in.
Aluminum 13.6 136
Copper
Totai Face Area (sq ft) 18.9
OUTDOOR AIR FAN Propeller Type, Direct Drive
Nominal Cfm 12,000
Number...Dlameter (in.) 2 26
Motor Hp (1075 Rptn) 1
INDOOR COIL Copper Tubes, Aluminum or Copper Plate Fins
Rows 3
FIns/ln.
Aluminum 14.3
Copper 13.1
Totai Face Area (sq ft) 16.5
INDOOR AIR FANf Centrifugal, Belt Drive
Quantity ...Size (in.) 2 .10x10
Nominal Cfm 6000
Rpm Range Std 916-1186
Maximum Aiiowabie Rpm 1550 1550
Motor Puiley Pitch Diameter (in.) Std 3 4-4.4
Fan Puiiey Pitch Diameter (in.) 6.4 6.6
Belt, Quantity...Type...Length (in.)
SpeedChangeperFuilTurn Std
of Moveable Pu Iley Flange (R pm) Opt
Moveable Pulley Max Full Turns
from Closed Position
Factory Setting — Full Turns Open
Factory Speed Setting (Rpm) Std 970
Motor Hp (Service Factor) Std
HIGH-PRESSURE SWITCH
Cutout (psig)
Reset (psig)
LOW-PRESSURE SWITCH (Liquid Line)
Cutout (psig)
Reset (psig)
Opt 1158-1428
Pulley A
Pulley B
Opt 4 3-5 3
Puiiey A
Puiiey B
Opt
Puiiey A
Puiiey B
Opt
AiR INLET SCREENS
Economizer, Number...Size (in.)
INDOOR AIR FILTERS (Type)
Number...Size (in.)
1470
1550
1630
1 .06DA537
6 20 .0 055/0 125
6...20 ..0 055/0 125
Semi-Hermetic — 6 Cylinders
R-22 R-22
21.2
200
110
65
Copper Tubes, Aluminum or Copper Plate Fins
124
—
—
—
—
1 V.45
54
55
5
35
1240
—
—
3 (1.15) 5 (1 15)
— —
428
320
27
60
2 20x25x1
1...20x20x1
10% efficient
2. 20x20x2
3.16x20x2
2.16x25x2
Disposable Fiberglass
50DP020
1980
2110
2220
2. 06DA824
17.0, 17.0
13 25 0 055/0 125
13. .25.0 055/0 125
4
124
22.2
11,400
2 .26
1
4
14.4
13 1
17.9
2 .12x12
7200
—
—
848
1060
—
—
32
4.0
2 ..V 45
—
—
—
—
—
—
848
1060
4 20x20x2
4 16x20x2
'System 1 consists of upper portion of outdoor coil and lower
portion of indoor coii, except for size 020 which is intertwined
t016 unit has adjustable standard and aiternate drives The 020
unit does not have an aiternate drive, but has 2 non-adjustable
pulieys Puiiey A is installed in unit; puiley B is shipped with unit
Page 6
Step 3 — Field Fabricate Ductwork — Secure all
ducts to building structure. Use flexible duct connectors
between unit and ducts as required. Insulate and weather
proof all external ductwork, joints and roof openings
with flashing and mastic in accordance with applicable
codes.
Ducts passing through an unconditioned space must
be insulated and covered with a vapor barrier.
A minimum clearance is not required on 50DP,
DPE012,014 and 50DP016 units. The 50DP020 units
with electric heat require one-in. clearance the first 24 in.
of ductwork.
Outlet grilles must not lie directly below unit discharge.
Step 4 — Make Unit Duct Connections — Unit
is shipped for through-the-bottom duct connections.
Ductwork openings are shown in Fig. 1 and 4. Duet
connections are shown in Fig. 5. Field-fabricated con
centric ductwork may be connected as shown in Fig. 6 and
7. Attach all ductwork to roof curb and roof curb basepans. Refer to installation instructions shipped with
accessory roof curb.
50DR DPE0I2.0I4 50DP0I6
INDOOR FAN MOTOR
NOTE: Do not drill in this area, damage to basepan may resuit
In water ieak
Fig. 6 — Concentric Duct Air Distribution
I
NOTE: Do not drill in this area, damage to basepan may result
in water leak.
Fig. 5 — Air Distribution — Through-the-Bottom
Step 5 — Trap Condensate Drain — See Fig. 4
and 8 for drain location. Plug is provided in drain hole
and must be removed when unit is operating. One 3/4-in.
half coupling is provided inside unit evaporator section
for condensate drain connection. An 8-1/2in. x 3/4-in.
diameter and 2-in. x 3/4-in. diameter pipe nipple coupled
to standard 3/4-in. diameter elbows provide a straight
path down through holes in unit base rails (see Fig. 9).
A trap at least 4 in. deep must be used and must be pro
tected against freeze-up.
NOTE: Dimension A, A1 and B, B1 are obtained from fieldsupplied ceiling diffuser.
Fig. 7 — Concentric Duct Details
■ y--:
CONNECTION
11 DRAIN HOLES
Fig. 8 — Condensate Drain Details
Page 7
(| )FPT
DRAIN CONNECTION^ U
(HALF COUPLING)
Determine maximum deviation from average voltage;
(AB) 457 - 452 = 5 volts
(BC) 464 - 457 = 7 volts
(AC) 457 ~ 455 = 2 volts
u
#
Fig. 9 — Condensate Drain Piping Details
BASE RAIL-
TO TRAP -!>
Maximum deviation is 7 volts.
Determine % voltage unbalanee;
% Voltage Unbalance = 100 ~ 1-53%
7
This amount of phase unbalance is satisfaetory as it is
below the maximum allowable 2%.
IMPORTANT; If the supply voltage phase un
balance is more than 2%, contaet your loeal electric
utility company immediately.
Unit failure as a result of operation on improper line
voltage or excessive phase imbalance constitutes abuse
and may eause damage to eleetrieal eomponents. Sueh
operation would invalidate any applieable Carrier
warranty.
Step 6 — Make Electrical Connections
FIELD POWER SUPPLY ^ Unit is factory wired for
voltage shown on nameplate. Units are provided with
terminal bloek.
When installing units, provide a diseonnect per NEC
of adequate size (Table 2).
All field wiring must eomply with National Eleetrieal
Code and loeal requirements.
Route power lines through control box end panel — or
unit basepan — (Fig. 4) to terminal connections as shown
on unit wiring diagram and Fig. 10.
FIELD CONTROL WIRING — Install a Carrierapproved accessory thermostat assembly aecording to
installation instruetions ineluded with aecessory. Loeate
thermostat assembly on a solid wall in the eonditioned
space to sense average temperature.
Route thermostat eable or equivalent single leads of
no. 18 AWG colored wire from subbase terminals
through eonduit in unit to low-voltage connections as
shown on unit label wiring diagram and in Fig. 11.
NOTE; For wire runs up to 50 ft, use no. 18 AWG insu
lated wire (35 C minimum). For 50 to 75 ft, use no. 16
AWG insulated wire (35 C minimum). For over 75 ft, use
no. 14 AWG insulated wire (35 C minimum).
Set heat anticipator settings as indicated in Table 3.
Settings may be changed slightly to provide a greater
degree of eomfort for a partieular installation.
Refer to accessory remote control panel instructions
as required.
UjO
2
O IE
OT Q.
r-\ •
1 FIELD
! POWER
1 SUPPLY
1
TBI
11
\Z
lá ¿6
•¿\
EQUIP GND
_____
I
Fig. 10 — Field Power Wiring Connections
Operating voltage to eompressor must be within
voltage range indieated on unit nameplate. On 3-phase
units, voltages between phases must be balanced within
2% and the eurrent must be balanced within 10%.
Use the following formula to determine the % voltage
unbalanee.
% Voltage Unbalanee
average voltage
Example; Supply voltage is 460-3-60.
AB = 452 volts
BC = 464 volts
AC = 455 volts
Average Voltage
452 + 464 + 455
1371
457
REMOVABLE JUMPER
THERMOSTAT ASSEMBLY
IhPHr^ 1^ ^ ^
[r][b]1^ÉÉ]É[^[£][x][h][1][KI
o
<
(r.
liJ
e>
q:
LOW-VOLTAGE TERMINAL BLOCK IN UNIT CONTROL BOX
z>
_j
CD s
Fig. 11 — Field Control Thermostat Wiring
Step 7 — Make Outdoor Air Inlet Adjustments
MANUAL OUTDOOR AIR DAMPER — All units
(except those equipped with a faetory-installed eeono-
mizer) have a manual outdoor air damper to provide
ventilation air. Damper ean be preset to admit up to 25%
outdoor air into return air compartment. To adjust,
loosen seeuring screws and move damper to desired
setting then retighten screws to seeure damper (Fig. 12).
OPTIONAL ECONOMIZER
Enthalpy Control Setting (loeation is shown in Fig. 13) —
For maximum benefit of outside air, set enthalpy control
to the A setting (Fig. 14).
Page 8
25% ADJUSTABLE
AIR DAMPER
SECURING SCREWS
Fig. 12 — 25% Outdoor Air Section Details
COOLING
LOCKOUT
SWITCH
ENTHALPY
CONTROL
DAMPER MOTOR
BASE
'UNIT
Fig. 14 — Enthalpy Control Assembly
Mixed Air Thermostat Setting — Set mixed air thermo
stat in return air compartment to desired temperature of
air delivered to the conditioned space (not less than 35 F
or condensation in unit will result).
FILTERS
ECONOMIZER
CONTROL BOX
ECONOMIZER ::|i
Fig. 13 — Enthalpy Control Location
(Economizer Damper Assembly — End View)
VOLTAGE
UNIT
MODEL
50DP012
VOLTS-PH-HZ
208/230-3-60
460-3-60
575-3-60
RANGE
Max
Min
187 253
414 508 105
632
518
Damper Vent Position Setting
1. Set fan switch at ON (continuous fan operation) and
close night switch if used.
2. Set system selector switch to OFF.
3. Remove cap from vent adjustment screw on damper
motor terminal box cover.
4. Turn adjustment screw slowly until dampers assume
desired vent position. Do not manually operate
damper motor; damage to motor will result.
Table 2 — Electrical Data
136
(ea)
49
(ea)
41
(ea)
OUTDOOR
FAN
MOTOR
FLA
Qty
38
2
25
2
2 1
2
COMPR
RLA LRA
24 0
(ea)
(ea)
8 3
(ea)
INDOOR
FAN
MOTOR
FLA FLA
Hp
1 0
1 5
1 0
1 0
1 0
1 0
1 5
1 5
1 5
1 5
1 0
1 5
1 0
1 0
1 0
1 5
1 5
1 5
1 0
20
1 0
20
40
5 7
40
40
40
40
5 7
5 7
57
5 7
1 8
2 6
1 8
1 8
1 8
26
26
26
1 4
27
2 7
1 4
FACTORY-
INSTALLED
HEATERS
74/ 82
122
122/135
41/ 45
74/ 82
122
122/135
41/ 45
21
39
66
21
39
66
37
37
kW
26/31
42*
42/52
14/17
26/31
42*
42/52
14/17
16
30
51
16
30
51
37
37
POWER
SUPPLY
Min Ckt
Amps
66/ 66
68/ 68
98/108
158
158/174
66/ 66
101/110
160
160/176
68/ 68
31
i ta
23 1 30
24 30
48 50
50 50
MOCP
(Amps)
175
i
Page 9
Table 2 — Electrical Data (cont)
98
49
69
41
55
OUTDOOR
FAN
MOTOR
Qiy
2 38
2
2 2 1
2 38
UNIT
MODEL
50DPE012
VOLTAGE
RANGE
VOLTS-PH-HZ
Min Max RLA LRA
208/230-3-60 187
460-3-60
575-3-60 518 632
208/230-3-60
414
187
253
508
253
COMPR
20 9
(compr 1)
20 9
(compr 2)
104
(compr 1)
103
(compr 2)
93
(compr 1)
83
(compr 2)
25 6
(ea)
(compr 1)
137
(compr 2)
(compr 1)
(compr 2)
(compr 1)
(compr 2)
137
(ea)
50DP014
460-3-60
575-3-60 518 632
#
208/230-3-60 187 253 49 3 191
414 508
11 6
(ea)
93
(ea)
69
(ea)
55
(ea)
2 25
2
2 7 7
50DPE014
414
460-3-60
575-3-60 518
208/230-3-60
508 22 1
632 179 69 2 26
187 253
61
86 2 33
266 2 77 30
500P016
460-3-60 414 508 32 0 120
575-3-60
208/230-3-60
518 632 25 6
187 254 49 3
50DP020
460-3-60
Fuse only; unshaded values indicate fuses or circuit
■SiSiiiJ breakers may be used
Compr — Compressor
FLA — Full Load Amps
Hp — Horsepower
414 508
(ea)
199
(ea)
96 2
153
(ea)
77
(ea)
2 33 30 48
2
2
LRA — Looked Rotor Amps
MOCP — Maximum Overcurrent Protection
RLA — Rated Load Amps
*CSA-approved heaters are rated at 208 volts only
INDOOR
FAN
MOTOR
FLA
25
2 1
26
77 50 167
33 50 76
Hp
20
30
20
20
20
20
30
30
30
3.0
20
30
20
20
20
30
30
3 0
20
30
20
30
20
30
20
20
20
20
30
30
30
3.0
20
30
20
20
20
30
30
30
20
30
20
3.0
20
30
20
20
20
20
30
30
30
30
20
30
2 0
20
20
30
30
30
20
30
20
30
3.0
FLA FLA
106
106
106
106
10.6
10 5
10 5
105
105
10.5
106
10 6
106
106
10 6
10 5
INSTALLED
75
75
74/ 82
7 5
122
7 5
122/135
75
41/ 45
74/ 82
122
122/135
41/ 45
34
48
34
34
34
48
48
48
2 7
39
27
39
7 5
75
74/ 82
75
122
7 5
122/135
7 5
41/ 45
74/ 82
122
122/135
41/ 45
34
48
34
34
34
48
48
48
2 7
39
27
3.9
7 5
74/ 82
75
122
75
122/135
75
41/ 45
75
74/ 82
122
122/135
41/ 45
34
48
34
34
34
48
48
48
27
39
27
3.93737
74/ 82
122/135
163
163/180
39
74/ 82
122/135
163/180
FACTORY-
HEATERS
kW
26/31
42*
42/52
14/17
26/31
42*
42/52
14/17
16
21
39
30
66
51
21
16
39
30
66
51
37
37
37
37
26/31
42*
42/52
14/17
26/31
42*
42/52
14/17
21
16
39
30
66
51
21
16
39
30
66
51
37
37
37
37
26/31
42*
42/52
14/17
26/31
42*
42/52
14/17
21
16
39
30
66
51
21
16
39
30
66
51
37
37
26/31
42/52
56*
56/69
39
30
66
51
96
73
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Page 10
Step 8 — Install Outdoor Air Hood — The out
door air hood is common to 25% air ventilation and
economizer. If economizer is used, all electrical connec
tions have been made and adjusted at the factory.
Assemble and install hood in the field.
NOTE: The hood top cover, upper and lower filter
retainers, hood drain pan and filter support bracket are
secured to the top crate above the condenser fans. The
screens, hood side panels, remaining section of filter
support bracket and all other hardware are in a package
located inside the return-air filter access panel (Fig. 15
and 16).
OUTDOOR AIR HOOD AND
MOUNTING BRACKETS
Fig. 15 — Outdoor Air Hood
Component Location
UNIT TOP CRATE
^ -j:
______________________
/
----------------
—=
----------
/—\
^ \
UPPER FILTER
RETAINER
/ I n«/FR
LOWER
FILTER
RETAINER
HOOD DRAIN PAN
FILTER
SUPPORT
BRACKET
Fig. 16 — Outdoor Air Hood Components
HOOD TOP
COVER
START-UP
Unit Preparation — Check that unit has been installed
in accordance with installation instructions and appli
cable codes.
Compressor Mounting — On 50DP,DPE012 and
50DP014 units, compressors are internally spring
mounted. Do not loosen or remove compressor hold
down bolts. On 50DPE014 and 50DP016, 020 units,
loosen compressor holddown bolts until sidewise move
ment of the washer under each holddown bolt head can
be obtained. Do not loosen completely as bolts are self
locking and will maintain adjustment.
Internal Wiring — Check all electrical connections
in unit control boxes; tighten as required.
Refrigerant Service Valves — Each 50DP,DPE012
and 50DP014 unit system has 2 Schrader type service
ports, one on suction line and one on compressor dis
charge line. Be sure that caps on the ports are tight. The
50DPE014 and 50DP016, 020 have one service valve on
suction line, one on discharge line and one on liquid line.
Be sure valves are open.
Crankcase Heater(s) are energized as long as there is
power to the unit.
NOTE: Unit power must be on for 24 hours prior to
start-up.
1. Assemble hood top cover, side panels, upper filter
retainer and drain pan (Fig. 17).
2. Secure lower filter retainer and support bracket to
unit as shown in Fig. 17.
3. Loosen sheet metal screws for base unit top cover
located above outdoor air inlet opening.
4. Match notches in hood top cover to unit top cover
screws. Insert hood flange between unit top cover
flange and unit. Tighten screws.
5. Insert outdoor air inlet screens and spacer in channel
created by lower filter retainer and filter support
bracket.
6. Attach remaining section of filter support bracket.
UNIT MODEL VOLTAGES
50DP,DPE012,014
10
Table 3 — Heat Anticipator Settings
kW STAGE 1
208-230/3/60 26-31 40
460/3/60
208-230/3/60
460/3/60 51 40
14-17
42-52
16
30
51 .40
26-31
42-52
56-69
30 40
73
40
66
40
40
40
.66
66
.66
STAGE 2
—
.40
40
—
.40
.66
66
40
.66
.40
66
.66
Page 11
w
Table 4 — Air Quantity Limits
UNIT MODEL MIN CFM MAX CFM
50DP,DPE012 3000
50DP,DPE014
50DP016 4500
50DP020
'Indoor Fan Max Watts = 3000
3750
5400
5000
6250
7500*
9000
HEATING — Turn on main power to unit. Set system
selector switch at HEAT, fan switch at AUTO.; and
thermostat at a setting above room temperature. First
stage of electric heater elements are energized on closing
of heating contact No. 1 in thermostat. On a further fall
of room temperature, heater contact No. 2 closes ener
gizing second-stage electric heater elements.
To Shut Off Unit — Set system selector switch at OFF.
VENTILATION AIR CIRCULATION (Continuous
Fan) — Unit power on. System selector switch at OFF,
HEAT or COOL; fan switch set at ON. Indoor fan con
tactor is energized through the switch on the thermostat,
and the indoor fan runs continuously.
Indoor Air Fan — Fan belts and pulleys are factory
installed. Belts are secured to pulleys with tape.
Remove tape and, if required, adjust as described in
Service, Indoor Air Fan Adjustment.
50DP020 has 2 non-adjustable pulleys. Pulley A is
installed in unit. Pulley В is shipped in cardboard box
taped to vestibule below main control box.
AUTOMATIC CHANGEOVER (with Autqmatic
Changeover Thermostat) — System selector switch set
at AUTO. When temperature of conditioned space rises
to cooling selector lever setting, unit automatically
switches from heating mode to cooling mode. When tem
perature of the conditioned space falls to the heating
selector lever setting, unit automatically changes from
cooling mode to heating mode. The thermostat is inter
Outdoor Air Fans and Motors are factory set. Refer
to Service, Outdoor Air Fan Adjustment as required.
Return Air Filters — Check that correct filters are
installed in filter tracks. See Table 1. Do not operate unit
without return air filters.
Outdoor Air Inlet Screens — Outdoor air inlet
locked so that cooling and heating systems do not operate
at the same time.
HEAD PRESSURE CONTROL — All units have fan
cycling thermostats which, at 55 F, shut off one outdoor
fan motor. This permits unit to operate down to 40 F
outdoor air temperature.
screens must be in place before operating unit.
Economizer Section — Remove filter access
panel. Check that outdoor air damper is closed and return
#
air damper is open.
Economizer operation and adjustment is described in
Start-Up, Economizer Operation; and Service, Econo
mizer Adjustment, respectively.
Base Unit Operation
COOLING — Unit power on. System selector switch at
COOL; fan switch at AUTO.; thermostat at a setting
Economizer Operation — If unit is equipped with
modulating outdoor air control (economizer), it should
operate as follows;
below room temperature.
50DPE014 and 50DP016 — Compressor starts unloaded
on closure of No. 1 contact in thermostat.
Additional rise in room temperature closes contact
No. 2 in thermostat which de-energizes the unloader coil.
Compressor is now fully loaded.
Check cooling effects at a setting below room tempera
ture. Check unit charge. Refer to Service, Refrigerant
Charge.
Reset thermostat at a temperature above room tem
perature. Compressor(s) will shut off.
50DP,DPE012 and 50DP014.020 — Upon a rise in room
temperature, cooling contact No. 1 in the thermostat
closes, energizing the first-stage cooling contactor and the
indoor fan contactor. The first-stage compressor, out
door fan motor and indoor fan motor start and run.
Upon a further rise in room temperature, cooling
contact No. 2 in the thermostat closes, energizing the
second-stage cooling contactor. The second-stage
compressor starts and runs.
COOLING MODE — Indoor and outdoor fans and com
pressor energize when there is a call for cooling and
enthalpy of outdoor air is above enthalpy control setting.
The economizer damper moves to VENT position.
Indoor fan starts and economizer damper opens fully
on a first-stage call for cooling when enthalpy of outdoor
air is below the enthalpy control setting. Compressor
remains off.
Compressor is energized and mechanical cooling
integrates with economizer cooling upon a second-
stage call for cooling. If outdoor air temperature falls
below 50 F, cooling lockout switch prevents compressor
from operating.
Economizer damper modulates when mixed air tem
perature is below mixed air thermostat setting.
A freeze protection thermostat (FPT) is located on the
indoor coil. It detects ice buildup and turns off the
compressor, thus allowing the coil to clear. Once ice
melts, the compressor can be re-energized.
To Shut Off Unit — Set system selector switch at OFF
position or reset thermostat above room temperature.
Units with Signal-LOC™ protection device shut down on
any safety trip and thermostat light comes on. Determine
reason for safety trip. Restart 50DPE014 and 50DP016,
020 compressor(s) by resetting circuit breaker at unit.
HEATING MODE — Outdoor air damper stays at
VENT position while indoor air fan runs.
NOTE: If fan switch is at ON position, and room thermo
stat is satisfied, damper goes to ventilation position.
11
Page 12
Variable Volume Units — Units suitable for use with
variable volume air handling systems are equipped with 2
electric unloaders on the compressor. The control panel
for these units (Fig. 18) consists of a step controller, a
proportional thermostat, a 7-day timer and a power
switch.
Before starting unit, open compressor service valves
and liquid line shutoff valve. Be sure compressor crank-
ease heaters have been on for 24 hours and that crankcase
oil level indicates half full.
CONTROL SEQUENCE CHECKOUT
1. Turn on unit main power supply. Be sure unit is ready
to operate.
2. Set variable volume control panel POWER switch
at ON.
3. If supply air leaving unit is above 50 F (or other fieldset temperature), step controller will operate to de
energize compressor unloader solenoids (compressor
loads up) until set temperature is achieved. An interval
of 13.5 minutes is required to maximum loading
position. Refer to unit label diagram for unloader
sequencing. Also see Fig. 19.
4. Step controller, 7-day timer and proportional thermo
stat are factory set and adjusted. If other settings
or changes in adjustment are required, refer to dis
cussion of these items.
SEVEN-DAY TIMER ADJUSTMENT — Factory
settings are ON — 6:30 A.M.; OFF — 7:30 P.M. for each
of 7 days.
1. On the timer dial face (Fig. 18), loosen the thumb
screws which position the system ON and OFF
trippers.
2. Set trippers at desired system ON and OFF time
settings and tighten thumbscrews. Skipping a day(s) is
accomplished by removing trippers from the dial.
3. Set the timer by turning the dial face clockwise until
fixed pointer indicates correct day and time. Do not
turn dial face counterclockwise. Do not move fixed
pointer.
PROPORTIONAL THERMOSTAT — The propor
tional thermostat. Fig. 18, monitors temperature of the
conditioned air leaving unit. On signal from the thermo
stat, sequence motor operates cam switches to load or
unload compressor to maintain thermostat setting.
Thermostat is factory set at 50 F ± 6 F but may be reset
between 0°F and 100F as follows:
Temperature Setting — Turn knob on front of case until
pointer indicates desired set point temperature. This is
the center point of proportional range.
Range Adjustment — Remove cover and turn adjustment
wheel until pointer indicates desired range.
If sequencer motor shaft constantly moves back and
forth, increase proportional thermostat range (about 5 F
at a time) until system is stable.
CYCLE-LOC
STEP
CONTROLLER
POWER
SWITCH
PROPORTIONAL
THERMOSTAT
Fig. 18 — Control Panel, Variable Volume Limits
SEVEN
DAY
TIMER
12
Page 13
STEP CONTROLLER — The step controller consists of
a reversible electric motor which drives a set of cams that
MAKE
POINT
BREAK
POINT
activate up to 5 snap-acting switches. Each cam is adjust
able to operate at any point on the 160 angular degrees of
camshaft rotation. The differential of each system may be
adjusted from a minimum of 5 angular degrees to a maxi
mum limited only by the 160 angular degrees of camshaft
rotation.
Rotational direction is controlled by the proportional
thermostat through the step controller feedback poten
tiometer and balancing relay.
Determining Switch Settings — Switches are factory set
at angular settings as shown m Fig. 19 (also shown on unit
label diagram). To reset, if desired, determine angular
differential for each switch and between switches. Then
determine minimum differential or throttling range of
proportional thermostat to provide desired step con
troller differential or throttling range. This range should
be wide enough to prevent rapid cycling from one
capacity step to another. Then adjust cams to new settings
as required.
Fig. 20 — Step Controller Cam Adjusting
Details (Motor End View)
Cam Adjustments — The step controller is shipped with
cams set to operate switches (i.e. compressor unloaders)
as shown in Fig. 19. All switches are closed (compressor
unloaded). The shaft is positioned all the way counter
clockwise (as viewed from motor end).
Using the following procedure, first adjust all operating
points in one direction of motor drive. Then reverse
motor direction and adjust switch differentials. Use
potentiometer wiper as an approximate indicator of
#
angular adjustments using angular displacement scale
mounted on potentiometer back plate. Also see Fig. 20.
1. Loosen all bushing setscrews with a 1/16-in. Allen
wrench. Loosen all cam hex screws with a 3/16-in.
open-end wrench.
If setscrews are not accessible from top of controller,
operate motor to rotate cams and bushings by shorting
terminals R and B for counterclockwise rotation and
terminals R and W for clockwise rotation.
2. Momentarily de-energize motor to permit motor to
recycle to start position. Jumper terminals R and W to
run motor camshaft to desired position for operating
first switch. Stop motor in this position by removing
jumper between terminals S and T.
3. Starting with first switch, turn cam clockwise until
switch makes an audible “click” as roller moves up cam
rise to higher level. This is the operating point. Lock
bushing setscrews.
operating point of each of remaining switches in
Set
manner. Advance motor by momentarily jumper-
like manner.__
______
ing terminals S and T.
160
5. Set switch differential by reversing motor (short
terminals R and B) and running it to desired break
point. Stop motor at this point by de-energizing power
at LI (POWER switch off). Start at last switch and
progress to first switch.
Move differential cam clockwise so that roller is on
high part of cam. Be sure that switch is at make
position. To check this, manually lift roller assembly
to make switch. Move differential cam counterclock
wise until roller drops to low level of cam. At this
point, switch should break. Lock the hex screw.
#
6. Check settings by performing Control Sequence
Checkout.
I 2 3 4
STEP CONTROL SWITCH
Fig. 19 — Step Controller Sequence
7. If 115-volt to step controller is de-energized, timer
recycles to start point when power is restored.
13
Page 14
SERVICE
A WARNING
Before performing service or maintenance operations
on unit, turn off main power switch to unit. Turn off
accessory heater power switch if applicable. Elec
trical shock could cause personal injury.
Cleaning — Inspect unit interior at beginning of each
heating and cooling season or as operating conditions
require. Remove unit top panel and/or side panels for
access to unit interior.
INDOOR COIL — Clean with a commercial coil cleaner.
OUTDOOR COIL — Clean outdoor coil annually or as
required by location or outdoor air conditions. Inspect
coil monthly — clean as required.
CONDENSATE DRAINS — Check and clean each year
at start of cooling season. In winter, keep drains and traps
dry or protect against freeze-up.
5. Set movable flange at nearest keyway of pulley hub
and tighten setscrew. (See Table 1 for speed change for
each full turn of pulley flange.)
To align fan and motor pulleys, loosen fan pulley set
screws and slide fan pulley along fan shaft. Make angular
alignment by loosening motor from mounting plate.
FILTERS — Clean or replace at start of each heating
and cooling season, or more often if operating conditions
require. Refer to Table 1 for type and size.
OUTDOOR AIR INLET SCREENS — Clean screens
with steam or hot water and a mild detergent. Do not use
throwaway filters in place of screens.
Lubrication
COMPRESSORS — Each compressor is charged with
correct amount of oil at the factory.
FAN SHAFT BEARINGS — No lubrication required.
Bearings are permanently lubricated.
FAN MOTOR BEARINGS — No lubrication of out
door fan or indoor blower motors are required for first
5 years of operation. Annually thereafter, clean and
repack bearings with a suitable bearing grease.
Indoor Air Fan Adjustment — Fan motor pulleys
are factory set for speed shown in Table 1. The 50DP020
units have fixed pulleys. Fan speed can be adjusted only
by changing the pulley. To change fan speed on 50DP,
DPE012,014and 50DP016:
Fig. 21 — Indoor Air Fan Pulley Adjustment
(50DP.DPE012,014 and 50DP016)
To Adjust Belt Tension — Loosen fan motor pivot
bolts. Move motor mounting plate up or down for proper
belt tension (1/2-in. deflection with one finger) and
tighten pivot bolts. Adjust lock bolt and nut on mounting
plate to secure in fixed position.
Outdoor Air Fan Adjustment (Fig. 22) — Shut off
unit power supply. Remove fan top grille assembly and
loosen fan hub screws. Adjust fan height on unit using a
straight edge placed across the fan orifice. Tighten
setscrews and replace rubber hubcap to prevent hub from
rusting to motorshaft. Fill hub recess with permagum if
rubber hubcap is missing.
1. Shut off unit power supply.
2. Loosen belt by loosening fan motor mounting
plate nuts.
3. Loosen movable pulley flange setscrew (see Fig. 21).
4. Screw movable flange toward fixed flange to increase
speed and away from fixed flange to decrease speed.
Increasing fan speed increases load on motor. Do not
exceed maximum speed specified in Table 1.
See Table 4 for air quantity limits.
14
50DPE014
'/4 ± '/b
A
(in.)
50DP,DPE012
50DP014 50DP016,020
’Vi6 ± Vs
Fig. 22 — Outdoor Air Fan Adjustment
Page 15
Economizer Adjustment
1. Set enthalpy control at its highest setting. If outdoor
temperature is above 70 F, perform the following:
install jumper between enthalpy control terminals 1
and 2 (red and yellow wires).
#
2. Set system selector switch at COOL and set cooling
selector lever at lowest setting. (Cooling mode may be
simulated by removing thermostat wires from termi
nals Y1 and Y2 [if used] and installing jumper between
Y1 and R.)
3. Set mixed air thermostat (MAT.) at lowest setting.
Outdoor air damper goes to fully open position
(indoor air damper closes).
4. Set mixed air thermostat at highest setting. Outdoor
air damper goes to fully elosed position ^ndoor air
damper opens).
5. Adjust meehanical linkage for correct positioning
if necessary. If cooling was simulated in 2, remove
jumper and reconnect thermostat wire(s).
Power Failure — Dampers do not have a spring
return. In event of power failure, dampers remain in
position until power is restored. Do not manually
Refrigerant Charge — Amount of refrigerant charge
is listed on unit nameplate and in Table 1. Refer to Carrier
Standard Service Techniques Manual, Chapter 1,
Refrigerants.
Unit panels must be in place when unit is operating
during charging procedure.
NO CHARGE — Use standard evacuating techniques.
After evacuating system, weigh in the specified amount of
refrigerant. (Refer to Table 1.)
LOW CHARGE COOLING — Using appropriate cool
ing charging chart. Fig. 24, 25, 26 or 27, add refrigerant
until conditions of the chart are met. Note that charging
charts are different from ones normally used. Charts are
based on charging units to correct superheat for various
operating conditions. An accurate pressure gage and
temperature sensing device are required. Connect tem
perature sensing device to service port on suction line and
insulate it so that outdoor ambient temperature does not
affect reading. Indoor air cfm must be within normal
operating range of unit.
operate damper motor.
TO USE COOLING CHARGING CHART — Take
outdoor ambient temperature and read the suction
pressure gage. Refer to chart to determine correct
50DP020 Indoor Air Fan Motor Removal
NOTE: To remove belts only, follow steps 1 - 4.
1. Remove filter and supply air section access panels.
Remove center post (Fig. 4).
2. Loosen adjusting nuts A and E, Fig. 23.
3. Push motor away from indoor coil to zero adjustment.
Tighten nut A.
4. Remove belts from pulleys.
5. Remove holddown screws at B and C. Loosen screw
at D.
6. Holding motor and pulley securely, slide motor
mount assembly out of unit along slide tracks.
NOTE: To reinstall motor, reverse above procedure.
suction temperature. If suction temperature is high, add
refrigerant. If suction temperature is low, carefully blow
some of the charge. Recheck suction pressure as charge
is adjusted.
Example: Fig. 24 — 50DP012
Outdoor Temperature
Suction Pressure
Suction Temperature should be
(Suction Temperature may vary ± 5F.)
If Chargemaster® charging device is used, temperature
and pressure readings must be accomplished using
appropriate charging chart.
.....................................................
........................................................
.....................................
75 F
65 psig
62 F
Page 16
SUCTION LINE TEMPERATURE F
Fig. 25 — Cooling Charging Chart —
50DPE012. 50DP014
(T
D
V)
CO
u
z
z
o
20 30 40 50 60
SUCTION LINE TEMP (F)
Fig. 26 — Cooling Charging Chart
50DPE014, 50DP016
70
20 3 0 4 5 50 6 0 65
SUCTION LINE TEMPERATURE (F)
70
Fig. 27 — Cooling Charging Chart — 50DP020
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book|1 |4 PC111 Catalog No 565-104 Printed in U S A Form50DP-26SI Pg16 7-88 Repiaces: 50DP-25Si
Tab llb|6b
For replacement items use Carrier Specifieci Parts
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