Carrier 50HS024-060 Dimensions and installation guide

Installation, Start-Up and
Service Instructions
CONTENTS Page
SAFETY CONSIDERATIONS ...................1
GENERAL ..................................1,2
RECEIVING AND INSTALLATION ............2-14
Step 1 — Check Equipment ...................2
• IDENTIFY UNIT
• INSPECT SHIPMENT
Step 2 — Provide Unit Support ...............2
• ROOF CURB
• SLAB MOUNT
Step 3 — Provide Clearances .................2
Step 4 — Rig and Place Unit ..................6
Step 5 — Select and Install Ductwork .........6
• CONVERTING HORIZONTAL DISCHARGE
UNITS TO DOWNFLOW (VERTICAL) DISCHARGE
• ACCESSORY RECTANGULAR DUCT
CONNECTION KIT INSTALLATION
Step 6 — Provide for Condensate Disposal ...12
Step 7 — Install Electrical Connections ......12
• HIGH-VOLTAGE CONNECTIONS
• ROUTING POWER LEADS INTO UNIT
• CONNECTING GROUND LEAD TO GROUND LUG
• ROUTING CONTROL POWER WIRES (24 v)
PRE-START-UP ............................14,15
START-UP ................................15-19
Check for Refrigerant Leaks .................15
Unit Start-Up Adjustments ...................15
Sequence of Operation ......................17
MAINTENANCE ............................20,21
Air Filter ....................................20
Unit Top Removal ...........................20
Indoor Blower and Motor ....................20
Outdoor Coil, Indoor Coil,
and Condensate Drain Pan ................21
Outdoor Fan ................................21
Electrical Controls and Wiring ...............21
Refrigerant Circuit ..........................21
Indoor Airflow ..............................21
Metering Devices ...........................21
Liquid Line Strainers ........................21
COOLING AND HEATING TROUBLESHOOTING
CHART ....................................22,23
START-UP CHECKLIST .....................CL-1
NOTE TO INSTALLER — Before the installation, READ
THESE INSTRUCTIONS CAREFULLY AND COM-
PLETELY. Also, make sure the Owner’s Manual and Serv-
ice Instructions are left with the unit after installation.
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment
can be hazardous due to system pressure and electrical com-
ponents. Only trained and qualified personnel should install,
repair, or service air-conditioning equipment.
Untrained personnel can perform basic maintenance
functions of cleaning coils and filters. All other operations
should be performed by trained service personnel. When work-
ing on air-conditioning equipment, observe precautions in
the literature, tags and labels attached to the unit, and other
safety precautions that may apply.
Follow all safety codes. Wear safety glasses and work gloves.
Use quenching cloth for unbrazing operations. Have fire ex-
tinguisher available for all brazing operations.
Before performing service or maintenance operations on
system, turn off main power to unit. Turn off accessory
heater power switch if applicable. Electrical shock can
cause personal injury.
GENERAL
The 50HS heat pumps are fully self-contained and
designed for outdoor installation. See Fig. 1. As shown in
Fig. 2 and 3, all units are shipped in a horizontal-discharge
configuration for installation on a ground-level slab.All units
can be converted to downflow discharge configurations for
rooftop applications. See Fig. 4 for roof curb dimensions.
Fig. 1 — Model 50HS Unit
50HS024-060
Single-Package Heat Pump Units
50 Hz, CE Units
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Tab 5a 5a Catalog No. 015-034 Printed in U.S.A. Form 50HS-C5SI Pg 1 5-98 Replaces: 50HS-C3SI

This literature contains installation, start-up, and service
instructions for 50HS heat pump units bearing the Mark of
the European Community (CE). These units are designed in
accordance with European Standard EN60335-2-40 and dis-
play the following Symbols:
Check Here
Compressor or Compressor Section
Compressor Test Pressure — High
Compressor Test Pressure — Low
Fuse
Heater
Minimum Clearance to Combustible
Materials 25 mm (1 in.) for first 305 mm
(12 in.) of duct when electric heater
is installed on vertical discharge unit
Minimum Unit Disconnect
Outdoor Fan
Phase
Number
Single Point Box
Fire Hazard
Explosion Hazard
No Open Flame
Check Compressor Rotation
Moving Parts Hazard
Indoor Air Section
Fan Section
Electrical Hazard
Ground
RECEIVING AND INSTALLATION
Step 1 — Check Equipment
IDENTIFYUNIT — The unit model number and serial num-
ber are stamped on the unit identification plate. Check this
information against shipping papers.
INSPECT SHIPMENT— Inspect for shipping damage while
unit is still on shipping pallet. If unit appears to be damaged
or is torn loose from its anchorage, have it examined by trans-
portation inspectors before removal. Forward claim papers
directly to transportation company. Manufacturer is not re-
sponsible for any damage incurred in transit.
Check all items against shipping list. Immediately notify
the nearest Carrier Air Conditioning office if any item is
missing.
To prevent loss or damage, leave all parts in original pack-
ages until installation.
Step 2 — Provide Unit Support
ROOF CURB — Install accessory roof curb in accordance
with instructions shipped with curb. See Fig. 4. Install in-
sulation, cant strips, roofing, and counter flashing as shown.
Ductwork must be attached to curb.
IMPORTANT: The gasketing of the unit to the roof curb
is critical for a watertight seal. Install gasketing material
supplied with the roof curb. Improperly applied gasketing
also can result in air leaks and poor unit performance.
Curb should be level to within 6 mm (
1
⁄ 4 in.). This is nec-
essary for unit drain to function properly. Refer to accessory
roof curb installation instructions for additional information
as required.
SLAB MOUNT — Place the unit on a solid, level concrete
pad that is a minimum of 102 mm (4 in.) thick with 51 mm
(2 in.) above grade. The slab should extend approximately
51 mm (2 in.) beyond the casing on all 4 sides of the unit.
Install a 152-mm (6-in.) gravel apron in front of outdoor coil
air inlet to prevent obstruction of airflow by grass or shrubs.
Do not secure the unit to the slab except when required by
local codes. In areas where prolonged subfreezing tempera-
tures or snowfall occur, increase unit clearance to 305 to
457 mm (12 to 18 in.) by constructing an angle-iron frame
to support unit. See Fig. 5 for recommended frame construc-
tion. Alternate construction should follow dimensions pro-
vided in Fig. 5.
Step 3 — Provide Clearances — The required mini-
mum service clearances and clearances to combustibles are
shown in Fig. 2 and 3.Adequate ventilation and outdoor air-
flow must be provided.
The outdoor fan pushes air through the outdoor coil and
discharges it through louvers on the top cover, the decora-
tive grille, and the compressor access panel. Be sure that the
fan discharge does not recirculate to the outdoor coil. Do not
locate the unit in a corner or under an overhead obstruction.
The minimum clearance under a partial overhang (such as a
normal house overhang) is 1219 mm (48 in.) above the unit
top. The maximum horizontal extension of a partial over-
hang must not exceed 1219 mm (48 in.).
Do not restrict outdoor airflow. An air restriction at ei-
ther the outdoor-air inlet or the fan discharge can be det-
rimental to compressor life.
Do not place the unit where water, ice, or snow from an
overhang or roof will damage or flood the unit. Do not in-
stall the unit on carpeting, tile, or other combustible mate-
rials. The unit may be installed on wood flooring or on Class
A, B, or C (U.S.A. Standard) roof covering materials.
2

Fig. 2 — Dimensions; Sizes 024-036
UNIT ELECTRICAL
CHARACTERISTICS UNIT WT CORNER WT (Kg/Lb) UNIT HEIGHT (mm/in.) DIMENSION (mm/in.)
Kg Lb A B C D E F
50HS024 400-3-50 128 281 29/64 31/69 44/ 96 24/52 697/27.4 546/21.5
50HS030 400-3-50 136 300 35/78 35/78 53/116 20/43 697/27.4 546/21.5
50HS036 400-3-50 147 324 29/63 42/93 45/100 31/68 798/31.4 648/25.5
UNIT CENTER OF GRAVITY (mm/in.)
XYZ
50HS024 544/21.4 522/20.5 304/11.9
50HS030 553/20.8 518/20.4 304/11.9
50HS036 552/21.7 531/20.9 344/13.5
REQ’D CLEARANCES FOR SERVICING — mm (in.)
Indoor Coil Access Side .....................762(30)
Control Box Access Side ....................762(30)
Unit Top .............................914(36)
Side Opposite Ducts ......................762(30)
REQ’D CLEARANCES TO COMBUSTIBLE MAT’L — mm (in.)
Unit Top .................................0
Duct Side of Unit ............................0
Side Opposite Ducts ..........................0
Bottom of Unit .............................0
Vertical Discharge, First 305 mm (12 in.) of Supply Duct .....25(1)
LEGEND
CG — Center of Gravity
MAT’L — Material
REQ’D — Required
NOTES:
1. Clearancesmustbemaintained toprevent recirculationof airfrom outdoor-
fan discharge.
2. Dimensions in ( ) are in millimeters unless otherwise noted.
3

Fig. 3 — Dimensions; Sizes 048,060
UNIT ELECTRICAL
CHARACTERISTICS UNIT WT CORNER WT (Kg/Lb)
Kg Lb A B C D
50HS048 400-3-50 165 363 38/83 43/95 54/118 30/67
50HS060 400-3-50 168 370 40/89 42/92 48/105 38/84
REQ’D CLEARANCES FOR SERVICING — mm (in.)
Indoor Coil Access Side ...................762(30)
Control Box Access Side ..................762(30)
Unit Top ...........................914(36)
Side Opposite Ducts ....................762(30)
REQ’D CLEARANCES TO COMBUSTIBLE MAT’L — mm (in.)
Unit Top ...............................0
Duct Side of Unit ..........................0
Side Opposite Ducts ........................0
Bottom of Unit ...........................0
Vertical Discharge, First 305 mm (12 in.) of Supply Duct . . . 25 (1)
UNIT CENTER OF GRAVITY (mm/in.)
XYZ
50HS048 543/21.4 540/21.3 440/17.3
50HS060 493/19.4 539/21.2 440/17.3
LEGEND
CG — Center of Gravity
MAT’L — Material
REQ’D — Required
NOTES:
1. Clearances must be maintained to prevent recirculation of air from
outdoor-fan discharge.
2. Dimensions in ( ) are in millimeters unless otherwise noted.
4

PART NUMBER ‘‘A’’
mm [in.]
Flat 50SS900015 203 [8] 50SS900016 279 [11]
50SS900017 356 [14]
NOTES:
1. Roof curb must be set up for unit being installed.
2. Seal strip must be applied as required for unit being installed.
3. Dimensions in [ ] are in millimeters unless otherwise noted.
4. Roof curb is made of 1.5 mm (16 gage) steel.
5. Attach ductwork to curb (flanges of duct rest on curb).
6. Service clearance 1219 mm (4 ft) on each side.
7. Direction of airflow.
8. Insulated panels: 25-mm (1-in.) thick fiberglass, .45-kg (1-lb) density.
Fig. 4 — Roof Curb Dimensions
5

Step 4 — Rig and Place Unit — Use spreader bars
or crate top when rigging unit. The units must be rigged for
lifting as shown in Fig. 6. Refer to Fig. 6 for rigging weights
and Tables 1A and 1B for operating weights. Use extreme
caution to prevent damage when moving the unit. Unit must
remain in an upright position during all rigging and moving
operations. Rollers may be used to move unit across roof.
The unit must be level for proper condensate drainage; the
ground-level pad or accessory roof curb must be level be-
fore setting the unit in place. When a field-fabricated sup-
port is used be sure that the support is level and that it
properly supports the unit.
Rig unit as shown in Fig. 6. See Fig. 2 and 3 for addi-
tional information. Lifting holes are provided in base rails as
shown in Fig. 6. Refer to rigging instructions on unit.
Step 5 — Select and Install Ductwork — The de-
sign and installation of the duct system must be in accor-
dance with local codes and ordinances.
Select and size ductwork, supply-air registers and return-
air grilles according to local codes.
The unit has duct flanges on the supply- and return-air
openings on the side of the unit. See Fig. 2 and 3 for con-
nection sizes and locations.
When designing and installing ductwork, consider the
following:
When connecting ductwork to units, do not drill deeper
than 13 mm (
1
⁄ 2 in.) in shaded area shown in Fig. 7 or
coil may be damaged.
• All units should have field-supplied filters or accessory fil-
ter rack installed in the return-air side of the unit. Rec-
ommended sizes for filters are shown in Tables 1A and
1B.
• Avoid abrupt duct size increases and reductions. Abrupt
change in duct size adversely affects airflow and unit
performance.
IMPORTANT: Use flexible connectors between duct-
work and unit to prevent transmission of vibration. Use
suitable gaskets to ensure weathertight and airtight seal.
When electric heat is installed, use fireproof canvas
(or similar heat resistant material) connector between
ductwork and unit discharge connection. If flexible duct
is used, insert a sheet metal sleeve inside duct. Heat
resistant duct connector (or sheet metal sleeve) must
extend 610 mm (24 in.) from electric heater element.
• Size ductwork for cooling air quantity (Tables 1Aand 1B).
The minimum air quantity for proper electric heater op-
eration is listed in Tables 2Aand 2B. Heater limit switches
may trip at air quantities below those recommended.
• Insulate and weatherproof all external ductwork. Insulate
and cover all ductwork passing through conditioned spaces
with a vapor barrier.
Fig. 5 — Heat Pump Mounting Frame
REQ — Required
NOTE: Mounting frame is constructed of 31.8 mm (1
1
⁄ 4 in.) to 38 mm
(1
1
⁄ 2 in.) commercial standard angle iron. Weld frame together. Paint
with zinc-rich paint (rustproof).
6

Table 1A — Physical Data — SI
UNIT 50HS 024 030 036 048 060
REFRIGERANT* R-22
Refrigerant Control Acutrol™ System
OPERATING WEIGHT (Kg) 128 136 147 165 168
COMPRESSOR
Type Reciprocating Reciprocating Reciprocating Scroll Scroll
INDOOR BLOWER Centrifugal — Direct Drive
Speeds 22222
R/s (High/Low Speed) 15.4/13.3 15.4/13.3 15.4/13.3 15.8/15.4 15.8/15.4
Diameter (mm) 254 254 254 254 254
Width (mm) 229 229 229 229 229
Nominal Airflow (L/s) 378 472 566 755 941
Motor (Watts) 373 373 373 559 559
INDOOR COIL
Rows...Fins/mm 3...0.59 3...0.59 3...0.59 4...0.59 4...0.59
Face Area (sq m) 0.21 0.28 0.33 0.41 0.41
OUTDOOR FAN Propeller — Direct Drive
L/s 802 896 896 1133 1133
R/s 16.7 18.3 18.3 17.9 17.9
Diameter (mm) 457 457 457 508 508
Motor (Watts) 186 186 186 248 248
OUTDOOR COIL
Rows...Fins/mm 1.6...0.67 2...0.67 2...0.67 2...0.67 2...0.67
Face Area (sq m) 0.54 0.54 0.64 0.78 0.78
FILTER SIZE (mm)†
Throwaway 508x508 508x610 610x610 610x762 610x762
*Operating charge listed on unit nameplate.
†Recommended field-supplied filters are 25-mm thick.
Table 1B — Physical Data — English
UNIT 50HS 024 030 036 048 060
REFRIGERANT* R-22
Refrigerant Control Acutrol System
OPERATING WEIGHT (lb) 281 300 324 363 370
COMPRESSOR
Type Reciprocating Reciprocating Reciprocating Scroll Scroll
INDOOR BLOWER Centrifugal — Direct Drive
Speeds 22222
Rpm (High/Low Speed) 925/800 925/800 925/800 950/925 950/925
Diameter (in.) 10 10 10 10 10
Width (in.) 99999
Nominal Airflow (Cfm) 800 1000 1200 1600 1995
Motor Hp
1
⁄ 21 ⁄ 21 ⁄ 23 ⁄ 43 ⁄ 4
INDOOR COIL
Rows...Fins/in. 3...15 3...15 3...15 4...15 4...15
Face Area (sq ft) 2.29 3.06 3.50 4.44 4.44
OUTDOOR FAN Propeller — Direct Drive
Cfm 1700 1900 1900 2400 2400
Rpm 1000 1100 1100 1075 1075
Diameter (in.) 18 18 18 20 20
Motor Hp
1
⁄ 41 ⁄ 41 ⁄ 41 ⁄ 31 ⁄ 3
OUTDOOR COIL
Rows...Fins/in. 1.6...17 2...17 2...17 2...17 2...17
Face Area (sq ft) 5.80 5.80 6.86 8.44 8.44
FILTER SIZE (in.)†
Throwaway 20x20 20x24 24x24 24x30 24x30
*Operating charge listed on unit nameplate.
†Recommended field-supplied filters are 1-in. thick.
7

• A 90-degree elbow must be used in the return duct or a
straight return duct must terminate with a grille securely
attached, so that if tools are dropped when working on the
unit, they will not enter the occupied psace.
• Units with electric heat require a 1-in. clearance for the
first 24 in. of ductwork.
• Outlet grilles must not lie directly below unit discharge.
Failure to follow these instructions on clearances and
90-degree ductwork and the location of outlet grilles could
result in personal injury and property damage from fall-
ing objects.
• Secure all ducts to building structure. Flash, weather-
proof, and vibration-isolate duct openings in wall or roof
according to good construction practices.
Figure 8 shows a typical duct system with 50HS installed.
Table 2A — Minimum Airflow for Uninterrupted
Electric Heater Operation — SI
MINIMUM AIRFLOW (L/s)
Unit Size
024 030 036 048 060
330 413 567 661 826
Table 2B — Minimum Airflow for Uninterrupted
Electric Heater Operation — English
MINIMUM AIRFLOW (Cfm)
Unit Size
024 030 036 048 060
700 875 1200 1400 1750
All panels must be in place when rigging.
NOTICE TO RIGGERS
Hook rigging shackles through holes in lifting brackets as shown in Detail A.
Lifting brackets shall be centered around the unit center of gravity. Use wood
top skid when rigging to prevent rigging straps from damaging unit. Remove
4 screws to slide wood support through rectangular hole in rail.
CHART A — UNITS WITH BASE RAIL
Unit
50HS
Shipping
Weight AB
Kg Lb mm in. mm in.
024 134 295 413 16.26 715.0 28.15
030 139 307 415 16.34 715.0 28.15
036 148 327 418 16.46 816.6 32.15
048 180 398 428 16.85 969.0 38.15
060 187 412 429 16.89 969.0 38.15
Fig. 6 — Suggested Rigging
Fig. 7 — Area Not To Be Drilled
8

CONVERTING HORIZONTAL DISCHARGE UNITS TO
DOWNFLOW (VERTICAL) DISCHARGE — The 50HS
units are shipped in a horizontal configuration. To convert a
horizontal unit for downflow (vertical) discharge, perform
the following steps:
Before performing service or maintenance operations on
system, turn off main power to unit. Turn off accessory
heater power switch if applicable. Electrical shock can
cause personal injury.
1. Open all electrical disconnects before starting any serv-
ice work.
2. Remove indoor coil access panel (Fig. 9). Save screws.
3. Locate lances in basepan insulation that is placed over
the perimeter of the vertical return duct opening cover
(Fig. 10).
4. Using a straight edge and sharp knife, cut and remove
the insulation around the perimeter of the cover. Re-
move the screws securing the cover to the basepan and
slide out the cover. Discard the cover (Fig. 11).
5. Remove indoor blower access panel (Fig. 12). Save screws.
6. Disconnect indoor-fan motor leads from indoor-fan
relay and unit contactor. Carefully disengage wire tie
containing indoor-fan motor leads from the unit control
box (Fig. 13).
7. Remove screws (Fig. 14) securing indoor blower hous-
ing to blower shelf and carefully slide out blower hous-
ing. On unit sizes 024-036, there is a filler bracket at-
tached to the blower shelf; remove this filler bracket and
retain for later use.
8. Locate lances in basepan insulation that is placed over
the perimeter of the vertical supply duct opening cover
(Fig. 15).
9. Using a straight edge and sharp knife, cut the insulation
around the perimeter of the cover. Remove the screws
securing the cover to the basepan and slide out the cover
(Fig. 16). Discard the cover. Install filler bracket re-
moved in Step 7.
10. If unit ductwork is to be attached to vertical opening
flanges on the unit basepan (jackstand applications only),
do so at this time.
Power Wiring
Control Wiring
Outdoor Section Airflow
Indoor Section Airflow
Fig.8—Typical Installation
ACCESS PANEL
(REMOVE SCREWS)
Fig. 9 — Indoor Coil Access Panel
LANCES OVER
PERIMETER
OF COVER
Fig. 10 — Basepan Insulation Over
Vertical Return Duct Opening
Fig. 11 — Insulation and Cover Removed from
Vertical Return Duct Opening
9

11. It is recommended that the basepan insulation around
the perimeter of the vertical opening be secured to the
basepan with aluminum tape to prevent the insulation
from tearing or bunching up when the blower housing is
installed in the vertical discharge position.
12. Orient blower housing for vertical airflow (blower mo-
tor adjacent to horizontal duct opening) and slide into
vertical opening making sure the flanges on the blower
side plates engage the tabs in the unit basepan.
Resistance will be felt as the blower housing contacts
the basepan insulation; this can be overcome by apply-
ing a slight force to the base of the blower. Continue
sliding blower in until hole in side plate flange aligns
with the hole in the basepan.
Secure using screws removed in Step 7. Reconnect indoor-
fan motor leads and insert wire tie back into unit control
box (Fig. 13).
13. Cover the horizontal duct openings. Duct covers can be
ordered as an accessory or be field-fabricated as shown
in Fig. 17.
14. Reinstall the indoor coil and indoor blower access
panels.
15. After completing unit installation, perform all safety checks
and power up unit.
REMOVE
SCREWS
Fig. 12 — Indoor Blower Access Panel
WIRE
TIES FAN MOTOR LEADS
Fig. 13 — Fan Motor Leads
REMOVE
FILLER
BRACKET
(024-036 0NLY)
Fig. 14 — Blower Shelf and Housing
LANCES OVER
PERIMETER OF COVER
Fig. 15 — Basepan Insulation Over
Vertical Supply Duct Opening
Fig. 16 — Insulation and Cover Removed from
Vertical Supply Duct Opening
10

ACCESSORY RECTANGULAR DUCT CONNECTION KIT
INSTALLATION (024-048 Only) — Refer to Fig. 18 for
duct adapter dimensions and hole locations.
1. Mark hole locations shown in Fig. 18.
2. At marked locations, drill holes using a no. 26 (.147-in.)
twist drill.
3. Partially secure duct flanges using 2 of the no. 10, 13-mm
(
1
⁄ 2 -in.) screws provided.
4. See the following caution. Using remaining holes in duct
flanges as templates, drill the remaining holes with the
no. 26 (.147-in.) drill.
Do not drill deeper than 13 mm (
1
⁄ 2 in.) into shaded
area shown in Fig. 18. Damage to refrigerant coil
could result.
5. Fully secure the duct flanges using the remaining screws
provided.
The finished kit installation accommodates a 375-mm x
375-mm (14
3
⁄ 4 -in. x 14
3
⁄ 4 -in.) duct.
NOTES:
1. An accessory duct cover is available as an alternative to field fabrication.
2. Construct duct cover out of 0.8 mm (22-gage) sheet metal.
Fig. 17 — Field-Fabricated Horizontal Duct Cover
NOTE: Do not drill more than 13 mm (
1
⁄ 2 in.) deep in shaded area.
Fig. 18 — Rectangular Duct Connection Kit —
Locating Holes
11

Step 6 — Provide for Condensate Disposal
NOTE: Be sure that condensate water disposal methods com-
ply with local codes, restrictions, and practices.
Units dispose of condensate through a
3
⁄ 4 -in. NPT fitting
which exits through the compressor access panel. See
Fig. 2 and 3 for location of condensate connection.
Condensate water can be drained directly onto the roof in
rooftop installations (where permitted) or onto a gravel apron
in ground-level installations. Install a field-supplied conden-
sate trap at end of condensate connection to ensure proper
drainage. See Fig. 19. Make sure that the outlet of the trap
is at least 25 mm (1 in.) lower than the drain-pan condensate
connection to prevent the pan from overflowing. Prime the
trap with water. When using a gravel apron, make sure it
slopes away from the unit.
If the installation requires draining the condensate water
away from the unit, install a 51 mm (2-in.) trap using a
3
⁄ 4 -in. FPT connection. See Fig. 19. Make sure that the outlet
of the trap is at least 25 mm (1 in.) lower than the unit
drain-pan condensate connection to prevent the pan from
overflowing.
Prime the trap with water. Connect a drain tube using a
minimum of 19 mm (
3
⁄ 4 -in.) PVC, 19 mm (
3
⁄ 4 -in.) CPVC, or
19 mm (
3
⁄ 4 -in.) copper pipe (all field supplied). Do not un-
dersize the tube. Pitch the drain tube downward at a slope of
at least 25 mm (1 in.) for every 3 m (10 ft) of horizontal run.
Be sure to check the drain tube for leaks.
Step 7 — Install Electrical Connections
The unit cabinet must have an uninterrupted, unbroken
electrical ground to minimize the possibility of personal
injury if an electrical fault should occur. This ground
may consist of an electrical wire connected to the unit
ground lug in the control compartment, or conduit ap-
proved for electrical ground when installed in accor-
dance with local electrical codes. Failure to adhere to
this warning could result in personal injury or death.
Failure to follow these precautions could result in dam-
age to the unit being installed:
1. Make all electrical connections in accordance with
local electrical codes governing such wiring. Refer
to unit wiring diagram.
2. Use only copper conductor for connections between
field-supplied electrical disconnect switch and unit.
DO NOT USE ALUMINUM WIRE.
3. Be sure that high-voltage power to unit is within op-
erating voltage range indicated on unit rating plate.
Ensure that phases are balanced within 2%. Consult
local power company for correction of improper volt-
age and/or phase imbalance.
4. Insulate low-voltage wires for highest voltage con-
tained within conduit when low-voltage control wires
are run in same conduit as high-voltage wires.
5. Do not damage internal components when drilling
through any panel to mount electrical hardware, con-
duit, etc.
HIGH-VOLTAGE CONNECTIONS — The unit must have
a separate electrical service with a field-supplied, water-
proof disconnect switch mounted at, or within sight from,
the unit. Refer to the unit rating plate for maximum fuse/
circuit breaker size and minimum circuit amps (ampacity)
for wire sizing. See Table 3 for electrical data.
The field-supplied disconnect may be mounted on the unit
over the high-voltage inlet hole. See Fig. 2 and 3.
Consult the Installation Instructions provided with the ac-
cessory for electrical service connections. For electric heater
information, see Table 4.
Operation of unit on improper line voltage constitutes
abuse and may cause unit damage that could affect
warranty.
ROUTING POWER LEADS INTO UNIT — Use only cop-
per wire between disconnect and unit. The high-voltage leads
should be in a conduit until they enter the duct panel; con-
duit termination at the duct panel must be watertight. Run
the high-voltage leads through the power entry knockout on
the duct panel (see Fig. 20 for location and size). When the
leads are inside the unit, run leads up the high-voltage race-
way to the control box (Fig. 21). Connect the leads to the
terminal block (see Fig. 22).
CONNECTING GROUND LEAD TO GROUND LUG —
Refer to Fig. 24. Connect the ground lead to the chassis us-
ing the ground lug in the wiring box.
ROUTING CONTROL POWER WIRES (24 v) — Form a
drip-loop with the thermostat leads before routing them into
the unit. Route the thermostat leads through grommeted, low
voltage hole provided in unit (see Fig. 20) into unit control
power splice box. Connect thermostat leads to unit control
power leads as shown in Fig. 23.
The unit transformer is of the safety-isolation type and
supplies 24-v power for the complete system. A manual-
reset circuit breaker is provided in the 24-v circuit, and the
unit transformer is factory-wired for 400 v.
Fig. 19 — Drain Tubing Connection and
Condensate Trap
35mm (1 3/8″) DIA.
POWER ENTRY
51mm (2″)DIA.
51mm (2″) DIA.
22mm (7/8″) DIA.
LOW VOLTAGE
ENTRY
29 mm (1 1/8") DIA.
NOTE: Power entry knockout measurements are for sizes 024-048.
For size 060 power entry knockout measurements see Fig. 3.
Fig. 20 — Duct Panel Knockouts
12

Table 3 — Electrical Data
UNIT
50HS V-PH (50 Hz)
VOLTAGE
RANGE COMPRESSOR OFM
FLA IFM FLA ELECTRIC HEAT UNIT
kW POWER SUPPLY
Min Max RLA LRA Nominal kW* FLA MCA MOCP†
024 400-3 380 420 4.8 34 1.4 1.6 — 6.9
10.4
—
10.5
15.8
3.1
9.4
12.9
9.0
22.1
28.7
10
25
30
030 400-3 380 420 4.8 40 1.4 1.6 — 6.9
10.4
—
10.5
15.8
3.8
9.6
13.1
9.0
22.1
28.7
10
25
30
036 400-3 380 420 6.4 42 1.4 1.6 — 6.9
10.4
—
10.5
15.8
4.8
10.3
13.8
11.0
24.1
30.7
15
25
35
048 400-3 380 420 8.9 64 2.0 4.0 —
6.9
10.4
12.1
—
10.5
15.8
18.5
5.6
11.5
15.0
16.7
17.1
31.6
38.3
41.6
25
35
40
45
060 400-3 380 420 11.3 73 2.0 4.0 —
6.9
10.4
12.1
—
10.5
15.8
18.5
8.3
12.5
16.0
17.7
20.0
31.0
37.6
41.0
25
35
40
45
LEGEND
——No Electric Heat
AWG — American Wire Gage
FLA — Full Load Amps
IFM — Indoor-Fan Motor
LRA — Locked Rotor Amps
MCA — Minimum Circuit Amps
MOCP — Maximum Over-Current Protection
OFM — Outdoor-Fan Motor
RLA — Rated Load Amps
*Electric heat capacity (kW) is based on heater voltages of 400 v. If
power distribution voltage to units varies from rated heater voltage,
see Table 5 on page 14.
†Fuse or circuit breaker.
NOTES:
1. The wire size and length is as follows:
UNIT
50HS MIN WIRE MAX WIRE LENGTH
mm
2
AWG60C M Ft
024-036 2.5 14 30.5 100
048, 060 4.0 12 30.5 100
2. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply voltage
is greater than 2%. Use the following formula to determine the per-
cent of voltage imbalance.
% Voltage Imbalance
max voltage deviation from average voltage
= 100 x average voltage
Example: Supply voltage is 400-3-50.
AB = 393 v
BC = 403 v
AC = 396 v
393 + 403 + 396
Average Voltage = 3
1192
=3
= 397
Determine maximum deviation from average voltage.
(AB) 397 – 393=4v
(BC) 403 – 397=6v
(AC) 397 – 396=1v
Maximum deviation is 6 v.
Determine percent of voltage imbalance.
6
% Voltage Imbalance = 100 x 397
= 1.5%
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.
IMPORTANT: If thesupply voltage phase imbalanceis more than
2%, contact your local electric utility company immediately.
Table 4 — Accessory Electric Heater Packages — Single-Point Connection
UNIT
50HS ELECTRIC HEAT KIT PART NO. CPHEATER------* ELECTRIC HEAT
(kW)†
400 V, 3 Ph HEATER
FLA MIN CIRCUIT
AMPACITY
FOR WIRE SIZING
MAX FUSE
OR CIRCUIT
BREAKER
024 021A00 6.9 10.5 22.1 25
022A00 10.4 15.8 28.7 30
030 021A00 6.9 10.5 22.1 25
022A00 10.4 15.8 28.7 30
036 021A00 6.9 10.5 24.1 25
022A00 10.4 15.8 30.7 35
048 021A00 6.9 10.5 31.6 35 022A00 10.4 15.8 38.3 40
023A00 12.1 18.5 41.6 45
060 021A00 6.9 10.5 31.0 35 022A00 10.4 15.8 37.6 40
023A00 12.1 18.5 41.0 45
LEGEND
FLA — Full Load Amps
*Electric heat kit provides single point wiring connections.
†Electric heat capacity (kW) is based on heater voltages of 400 v. If power distribution voltage to units
varies from rated heater voltage, see Table 5 on page 14.
13

Table 5 — Multiplication Factors
HEATER kW
RATING VOLTAGE DISTRIBUTION V,3Ph MULTIPLICATION FACTOR
400 380 .90
400 1.00
415 1.08
420 1.10
Example: 12.1 kW (at 440 v ) heater on 380 v
= 12.1 (.90 multiplication factor)
= 10.9 kW capacity at 380 v
NOTE: Heater kW rating is voltage as marked on 50HS base unit
nameplate. Voltage distribution is the design power supply at instal-
lation site.
PRE-START-UP
Failure to observe the following warnings could result
in serious personal injury:
1. Follow recognized safety practices and wear protec-
tive goggles when checking or servicing refrigerant
system.
2. Do not operate compressor or provide any electric
power to unit unless compressor terminal cover is in
place and secured.
3. Do not remove compressor terminal cover until all
electrical sources are disconnected.
4. Relieve all pressure from both high- and low-
pressure sides of the system before touching or dis-
turbing anything inside terminal box if refrigerant leak
is suspected around compressor terminals. Use ac-
cepted methods to recover refrigerant.
5. Never attempt to repair soldered connection while re-
frigerant system is under pressure.
6. Do not use torch to remove any component. System
contains oil and refrigerant under pressure. To re-
move a component, wear protective goggles and pro-
ceed as follows:
a. Shut off electrical power to unit.
b. Relieve all pressure from system using both high-
and low-pressure ports. Use accepted methods to
recover refrigerant.
c. Cut component connecting tubing with tubing cut-
ter and remove component from unit.
d. Carefully unsweat remaining tubing stubs when
necessary. Oil can ignite when exposed to torch
flame.
Complete the Start-Up Checklist on page CL-1 and
proceed as follows to inspect and prepare the unit for initial
start-up:
1. Remove all access panels.
2. Read and follow instructions on all WARNING, CAU-
TION, and INFORMATION labels attached to, or shipped
with, unit.
Make the following inspections:
a. Inspect for shipping and handling damages such as bro-
ken lines, loose parts, disconnected wires, etc.
b. Inspect for oil at all refrigerant tubing connections and
on unit base. Detecting oil generally indicates a re-
frigerant leak. Leak-test all refrigerant tubing connec-
tions using electronic leak detector or liquid-soap so-
lution. If a refrigerant leak is detected, see Check for
Refrigerant Leaks section on page 15.
Fig. 21 — Field Wiring
LEGEND
GND — Ground
HR — Heater Relay
TB — Terminal Block
Factory Wiring
—--— Field Accessory Wiring
Splice Connections
Fig. 22 — Line Power Connections
Fig. 23 — Control Connections
14

c. Inspect all field and factory wiring connections. Be sure
that connections are completed and tight.
d. Inspect coil fins. If damaged during shipping and han-
dling, carefully straighten fins with a fin comb.
3. Verify the following conditions:
a. Make sure that outdoor-fan blade is correctly posi-
tioned in fan orifice. Leading edge of blade should be
51 mm (2 in.) back from outdoor inlet grille and
12.7 mm (
1
⁄ 2 in.) maximum from fan deck.
b. Make sure that air filter(s) is in place.
c. Make sure that condensate drain pan and trap are filled
with water to ensure proper drainage.
d. Make sure that all tools and miscellaneous loose parts
have been removed.
4. If the unit is equipped with a crankcase heater, start the
heater 24 hours before starting the unit. To start the heater
only, turn the thermostat to the OFF position and ener-
gize the electrical disconnect to the unit.
START-UP
Complete the Start-Up Checklist on page CL-1 (if not al-
ready completed), and proceed as follows:
Check for Refrigerant Leaks — Locate and repair
refrigerant leaks and charge the unit as follows:
1. Using both high- and low-pressure ports, locate leaks and
recover remaining refrigerant to relieve system pressure.
2. Repair leak following accepted practices.
NOTE: Install a filter drier whenever the system has been
opened for repair.
3. Check system for leaks using an approved method.
4. Evacuate refrigerant system and recover refrigerant if no
additional leaks are found.
5. Charge unit with R-22 refrigerant, using a volumetric-
charging cylinder or accurate scale. Refer to unit rating
plate for required charge. Be sure to add extra refrigerant
to compensate for internal volume of filter drier.
Unit Start-Up Adjustments
Complete the required procedures given in the Pre-
Start-Up section on this page before starting the unit.
Do not jumper any safety devices when operating
the unit.
Do not operate the unit in cooling mode when the
outdoor temperature is below 4 C (40 F) (unless acces-
sory low-ambient kit is installed).
Do not rapid-cycle the compressor. Allow 5 minutes
between ‘‘on’’ cycles to prevent compressor damage.
CHECKING COOLING AND HEATING CONTROL OP-
ERATION — Start and check the unit for proper control op-
eration as follows:
1. Place room thermostat SYSTEM switch in OFF position.
Observe that blower motor starts when FAN switch is placed
in ON position and shuts down within 30 seconds when
FAN switch is placed in AUTO. position.
2. Place SYSTEM switch in COOLposition and FAN switch
in AUTO. position. Set control below room temperature.
Observe that compressor, outdoor fan, and indoor blower
motors start. Observe that cooling cycle shuts down when
control setting is satisfied.
3. Place system switch in HEAT position. Set control above
room temperature. Observe that heating cycle shuts down
when control setting is satisfied.
4. When using an automatic changeover room thermostat,
place both SYSTEM and FAN switches in AUTO. posi-
tion. Observe that unit operates in cooling mode when
temperature control is set to ‘‘call for cooling’’ (below
room temperature), and unit operates in heating mode when
temperature control is set to ‘‘call for heating’’(above room
temperature).
IMPORTANT: Scroll compressors in the 048 and
060 size units are direction-oriented. Units must be
checked to ensure proper compressor 3-phase power
lead orientation. If not corrected within 5 minutes,
the internal protector will shut off the compressor.
The 3-phase power leads to the unit must be re-
versed to correct rotation. When turning back-
wards, scroll compressors emit elevated noise lev-
els, and the difference between compressor suction
and discharge pressures may be dramatically lower
than normal.
REFRIGERANT CHARGE —Amount of refrigerant charge
is listed on unit nameplate. Refer to Carrier Standard Serv-
ice Techniques Manual, Chapter 1, Refrigerants section.
Unit panels must be in place when unit is operating dur-
ing charging procedure.
No Charge — Use standard evacuating techniques.After evacu-
ating system, weigh in the specified amount of refrigerant
(refer to unit nameplate).
Low Charge Cooling — Use Cooling Charging Charts,
Fig. 24-28. Vary refrigerant until the conditions of the ap-
propriate chart are met. Note that charging charts are dif-
ferent from the type normally used. Charts are based on charging
the units to the correct superheat for the various operating
conditions. Accurate pressure gage and temperature sensing
device are required. Connect the pressure gage to the service
port on the suction line. Mount the temperature sensing
device on the suction line and insulate it so that outdoor am-
bient temperature does not affect the reading. Indoor-air L/s
(cfm) must be within the normal operating range of the unit.
To Use Cooling Charging Chart — Take the outdoor ambi-
ent temperature and read the suction pressure gage. Refer to
appropriate chart to determine what the suction temperature
should be. If suction temperature is high, add refrigerant. If
suction temperature is low, carefully recover some of the charge.
Recheck the suction pressure as charge is adjusted.
Example: (Fig. 24)
Outdoor Temperature ....................29C(85F)
Suction Pressure should be ..........524kPa(76psig)
Suction Temperature should be ............17C(62F)
(Suction Temperature may vary ± 2.5 C [5 F].)
If Chargemastertcharging device is used, temperature and
pressure readings must be accomplished using the charging
chart.
15

Fig. 24 — Cooling Charging Chart, 50HS024
Fig. 25 — Cooling Charging Chart, 50HS030
Fig. 26 — Cooling Charging Chart, 50HS036
Fig. 27 — Cooling Charging Chart, 50HS048
LEGEND (Fig. 24-28)
Outdoor-Air Temperature Pressure Compressor Suction Line Temperature
16

INDOOR AIRFLOW AND AIRFLOW ADJUSTMENTS
For cooling operation, the recommended airflow is
165 to 212 L/s (350 to 450 cfm) per each 3.5 kW (12,000
Btuh) of rated cooling capacity.
Tables 6 and 7 show airflows at several external static pres-
sures. Tables 8A-10B show accompanying pressure drops for
wet coils, electric heaters, and filters. Be sure that airflow
does not fall below requirement for safe electric heater op-
eration. See Tables 2A and 2B. Refer to these tables to de-
termine the airflow for the system being installed.
NOTE: Be sure that all supply- and return-air grilles are open,
free from obstructions, and adjusted properly.
Disconnect electrical power to the unit before changing
blower speed. Electrical shock can cause personal in-
jury or death.
The airflow can be changed by changing the lead connec-
tions of the blower motor. The motor leads are color-coded
as follows:
black = high speed
red = low speed
The 2-speed indoor-fan motor is factory wired for low-
speed operation (red wire) on all models. To change the speed
of the blower motor, remove the fan motor speed leg lead
from the indoor-fan contactor (IFC). This wire is attached to
terminal 3. Remove red wire and replace with black lead for
high speed. Make sure that the removed lead is insulated so
that it will not contact any unit chassis parts.
UNIT CONTROLS — All compressors have the following
internal-protection controls.
High-Pressure Relief Valve — This valve opens when the
pressure differential between the low and high side becomes
excessive.
Compressor Overload — This overload interrupts power to
the compressor when either the current or internal tempera-
ture becomes excessive, and automatically resets when the
internal temperature drops to a safe level.
The compressor overload may require up to 60 minutes
(or longer) to reset; therefore, if the internal overload is sus-
pected of being open, disconnect the electrical power to the
unit and check the circuit through the overload with an ohm-
meter or continuity tester.
Sequence of Operation
INDOOR FAN — With the thermostat fan switch in the ON
position, 24 v is supplied to the indoor-fan contactor (IFC)
through G on the thermostat. This voltage energizes the coil
of the relay, closes the normally open set of contacts, and
provides continuous power to the indoor-fan motor (IFM).
If the switch is moved to the AUTO. position, the fan will
cycle with the compressor.
COOLING — When power is supplied to the unit, trans-
former (TRAN) is energized. On units with a reciprocating
compressor, crankcase heater (CH) is also energized.
On a call for cooling and with indoor fan set at AUTO.
position, the thermostat makes circuits R-Y, R-G, and R-O.
When room temperature rises, the thermostat makes circuits
R to Y to contactor (C).After a 5-minute delay, the outdoor-
fan motor (OFM) and compressor start. Circuit R-O ener-
gizes the reversing valve (RVS). Circuit R-G makes and en-
ergizes IFC starting the IFM.When the thermostat is satisfied,
contacts open, deenergizing the contactor. The compressor
and IFM stop. The IFR has a 30-second delay before deen-
ergizing the indoor blower motor.
HEATING — On a call for heating, the thermostat makes
circuits R-Yand R-G. When room temperature falls, the ther-
mostat makes circuits to R to Y to contactor (C). After a
5-minute delay, the OFM and compressor start. Circuit R-G
makes and energizes the IFC, starting the IFM. If room tem-
perature continues to fall, circuit R-W makes through the
second-stage thermostat bulb. If an accessory electric heat
package is used, a relay is energized bringing on electric heat.
When the thermostat is satisfied, contacts open, deenergiz-
ing the contactor and relay. Motors and heaters stop. The
IFM can be controlled by a time-delay relay which causes
the fan to delay for 30 seconds.
DEFROST — Defrost board (DB) is a time and temperature
control. The DB includes a field-selectable time period be-
tween checks for frost (30, 50, or 90 minutes). The elec-
tronic timer and defrost cycle start only when contactor is
energized and defrost thermostat (DFT) is closed. The De-
frost mode is identical to Cooling mode, except in Defrost
mode, the OFM stops and the accessory electric heat is en-
ergized to warm the air supplying the conditioned space.
Fig. 28 — Cooling Charging Chart, 50HS060
17

Table 6 — Dry Coil Air Delivery* — Horizontal and Vertical Discharge — SI
UNIT
50HS MOTOR SPEED
400 VOLT
External Static Pressure (Pa)
0 25 50 75 100 125 150 175 200 225 250
024 Low Watts 522 492 467 429 408 373 320 316 270 — —
L/s 726 690 656 599 569 496 458 404 295 — —
High Watts — 591 562 530 492 474 427 392 349 — —
L/s — 747 702 652 603 558 473 380 287 — —
030 Low Watts — 572 537 490 452 408 368 329 291 — —
L/s — 723 701 656 615 541 485 391 314 — —
High Watts — 650 597 571 522 487 453 393 361 — —
L/s — 814 766 719 655 599 516 403 317 — —
036 Low Watts — — — 557 528 500 477 440 — — —
L/s — — — 717 661 596 544 451 — — —
High Watts — — — — 686 656 625 576 — — —
L/s — — — — 708 634 565 441 — — —
048 Low Watts — — — — 983 890 770 758 731 667 —
L/s — — — — 1000 917 827 807 764 665 —
High Watts — ————1139881851772754—
L/s—————1024 885 846 722 687 —
060 Low Watts — 1116 1046 1009 978 907 839 ————
L/s — 1212 1161 1105 1064 961 865 ————
High Watts — — 980 934 870 807 717 ————
L/s — — 1160 1125 1039 964 836 ————
*Air delivery values are based on operating voltage of 400 v, dry coil, without filter or electric heater.
Deduct wet coil, filter, and electric heater pressure drops to obtain external static pressure available for
ducting.
NOTES:
1. Do not operate the unit at a cooling airflow that is less than 165 L/s for each 3.5 kW of rated cooling
capacity. Indoor coil frosting may occur at airflows below this point.
2. Dashes indicate portions of table that are beyond the blower motor capacity or are not recom-
mended.
Table 7 — Dry Coil Air Delivery* — Horizontal and Vertical Discharge — English
UNIT
50HS MOTOR SPEED
400 VOLT
External Static Pressure (in. wg)
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
024 Low Watts 522 492 467 429 408 373 320 316 270 — —
Cfm 1538 1463 1390 1269 1206 1052 971 856 626 — —
High Watts — 591 562 530 492 474 427 392 349 — —
Cfm — 1583 1487 1381 1277 1183 1002 805 609 — —
030 Low Watts — 572 537 490 452 408 368 329 291 — —
Cfm — 1533 1486 1390 1303 1146 1028 829 666 — —
High Watts — 650 597 571 522 487 453 393 361 — —
Cfm — 1724 1624 1524 1387 1270 1094 855 672 — —
036 Low Watts — — — 557 528 500 477 440 — — —
Cfm — — — 1519 1400 1264 1153 956 — — —
High Watts ————686656625576———
Cfm————1500 1344 1197 934 — — —
048 Low Watts ————983890770758731667—
Cfm————2120 1944 1753 1711 1618 1409 —
High Watts —————1139881851772754—
Cfm—————2171 1876 1793 1531 1456 —
060 Low Watts — 1116 1046 1009 978 907 839 — — — —
Cfm — 2568 2461 2341 2254 2036 1834 — — — —
High Watts — — 980 934 870 807 717 — — — —
Cfm — — 2459 2383 2202 2043 1771 — — — —
*Air delivery values are based on operating voltage of 400 v, dry coil, without filter or electric heater.
Deduct wet coil, filter, and electric heater pressure drops to obtain external static pressure available for
ducting.
NOTES:
1. Do not operate the unit at a cooling airflow that is less than 350 cfm for each 12,000 Btuh of rated
cooling capacity. Indoor coil frosting may occur at airflows below this point.
2. Dashes indicate portions of table that are beyond the blower motor capacity or are not
recommended.
18

Table 8A — Wet Coil Pressure Drop — SI
UNIT 50HS AIRFLOW
(L/s) PRESSURE DROP (Pa)
024
283 10
330 14
378 19
425 22
030 425 22 472 24
569 31
036
472 17
569 22
661 27
755 31
048 661 17 755 19
850 22
060
802 20
896 24
991 27
1085 31
NOTE: Direct interpolation is permissible. Do not extrapolate.
Table 9A—Accessory Electric Heater Pressure Drop
(Pa) — SI
HEATER
kW L/s
283 378 472 569 661 755 850 944 1038
6.9-12.1 7.5 8.2 9.2 10.4 11.7 12.9 14.9 16.7 18.7
NOTE: Direct interpolation is permissible. Do not extrapolate.
Table 8B — Wet Coil Pressure Drop — English
UNIT 50HS AIRFLOW
(cfm) PRESSURE DROP (in. wg)
024
600 0.039
700 0.058
800 0.075
900 0.088
030 900 0.088 1000 0.095
1200 0.123
036
1000 0.082
1200 0.102
1400 0.120
1600 0.143
048 1400 0.068 1600 0.075
1800 0.088
060
1700 0.082
1900 0.095
2100 0.108
2300 0.123
NOTE: Direct interpolation is permissible. Do not extrapolate.
Table 9B —Accessory Electric Heater Pressure Drop
(in. wg) — English
HEATER
kW CFM
600 800 1000 1200 1400 1600 1800 2000 2200
6.9-12.1 0.030 0.033 0.037 0.042 0.047 0.052 0.060 0.067 0.075
NOTE: Direct interpolation is permissible. Do not extrapolate.
Table 10A — Filter Pressure Drop (Pa) — SI
UNIT 50HS FILTER
SIZE (mm) L/s
236 283 330 378 425 472 519 569 614 661 707 755 802 850 896 944 991 1038 1085
024 508 x 508 12.4 17.4 19.9 24.9 29.9 32.3 ———————————— —
030 508x610————22.4 24.9 27.4 32.3 34.8 ————————— —
036 610x610—————19.9 22.4 24.9 27.4 29.9 34.8 37.3 —————— —
048, 060 610x762—————————22.4 24.9 27.4 29.9 32.3 34.8 37.3 39.8 42.3 44.8
NOTE: Direct interpolation is permissible. Do not extrapolate.
Table 10B — Filter Pressure Drop (in. wg) — English
UNIT 50HS FILTER
SIZE (in.) CFM
500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300
024 20 x 20 0.05 0.07 0.08 0.10 0.12 0.13 — ————————————
030 20x24————0.09 0.10 0.11 0.13 0.14 ——————————
036 24x24—————0.08 0.09 0.10 0.11 0.12 0.14 0.15 ———————
048, 060 24x30—————— — — —0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18
NOTE: Direct interpolation is permissible. Do not extrapolate.
19

MAINTENANCE
To ensure continuing high performance, and to minimize
the possibility of premature equipment failure, periodic main-
tenance must be performed on this equipment. This heat pump
unit should be inspected at least once each year by a quali-
fied service person. To troubleshoot units, refer to
Cooling and Heating Troubleshooting chart in the back of
this book.
NOTE TO EQUIPMENT OWNER: Consult your local dealer
about the availability of a maintenance contract.
The ability to properly perform maintenance on this equip-
ment requires certain expertise, mechanical skills, tools,
and equipment. If you do not possess these, do not at-
tempt to perform any maintenance on this equipment.
FAILURE TO HEED THIS WARNING COULD RE-
SULT IN SERIOUS PERSONAL INJURY AND POS-
SIBLE DAMAGE TO THIS EQUIPMENT.
The minimum maintenance requirements for this equip-
ment are as follows:
1. Inspect air filter(s) each month. Clean or replace when
necessary.
2. Inspect indoor coil, drain pan, and condensate drain each
cooling season for cleanliness. Clean when necessary.
3. Inspect blower motor and wheel for cleanliness and check
lubrication each cooling season. Clean and lubricate when
necessary.
4. Check that electrical connections are tight and check con-
trols for proper operation each cooling season. Service
when necessary.
Failure to follow these warnings could result in serious
personal injury:
1. Turn off electrical power to the unit before perform-
ing any maintenance or service on the unit.
2. Use extreme caution when removing panels and parts.
As with any mechanical equipment, personal injury
can result from sharp edges.
3. Never place anything combustible either on, or in con-
tact with, the unit.
Air Filter
Never operate the unit without a suitable air filter in the
return-air duct system. Always replace the filter with the
same dimensional size and type as originally installed.
See Tables 1A and 1B for recommended filter sizes.
Inspect air filter(s) at least once each month and replace
at least twice during each cooling season or whenever the
filters become clogged with dust and lint.
Replace filters with the same dimensional size and type as
originally provided.
Unit Top Removal
NOTE: When performing maintenance or service proce-
dures that require removal of the unit top, be sure to perform
all of the routine maintenance procedures that require top
removal, including coil and condensate drain pan inspection
and cleaning.
Only qualified service personnel should perform mainte-
nance and service procedures that require unit top removal.
To remove unit top:
1. Remove 7 screws on unit top cover surface. (Save all screws.)
2. Remove 4 screws on unit top cover flange. (Save all screws.)
3. Lift top from unit carefully. Set top on edge and make
sure that top is supported by unit side that is opposite
duct (or plenum) side.
4. Carefully replace and secure unit top to unit (using screws
removed in Steps 1 and 2), when maintenance and/or serv-
ice procedures are completed.
Indoor Blower and Motor
NOTE: Motors without oilers are prelubricated. Do not at-
tempt to lubricate these motors.
For longer life, operating economy, and continuing effi-
ciency, clean accumulated dirt and grease from the blower
wheel and motor annually.
Lubricate the motor every 5 years if the motor is used in-
termittently (thermostat FAN switch in AUTO. position), or
every 2 years if the motor is used continuously (thermostat
FAN switch in ON position).
Disconnect and tag electrical power to the unit before
cleaning and lubricating the blower motor and wheel.
Failure to adhere to this warning could cause personal
injury or death.
To clean and lubricate the blower motor and wheel:
1. Remove and disassemble blower assembly as follows:
a. Remove blower access door.
b. Disconnect motor lead from indoor-fan contactor. Dis-
connect yellow motor lead from terminal L2 or 23 of
the contactor.
c. Remove blower assembly from unit. Be careful not to
tear insulation in blower compartment.
d. Ensure proper reassembly by marking blower wheel
and motor in relation to blower housing before
disassembly.
e. Loosen setscrew(s) which secure wheel to motor shaft.
Remove screws that secure motor mount brackets to
housing and slide motor and motor mount out of
housing.
2. Lubricate motor as follows:
a. Thoroughly clean all accumulations of dirt or grease
from motor housing.
b. Remove dust caps or plugs from oil ports located at
each end of motor.
c. Use a good grade of SAE 20 (Society of Automotive
Engineers, U.S.A.) nondetergent motor oil and put
5 cc (1 teaspoon,
3
⁄ 16 oz, or 16 to 25 drops) in each oil
port.
d. Allow time for oil to be absorbed by each bearing,
then wipe excess oil from motor housing.
e. Replace dust caps or plugs in oil ports.
3. Remove and clean blower wheel as follows:
a. Ensure proper reassembly by marking wheel orienta-
tion and cutoff plate location.
b. Remove screws holding cut-off plate, and remove plate
from housing.
20