Carrier 50YQ Installation, Start-Up And Service Instructions Manual

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Carrier Parkway • Syracuse, N Y 13221
Single-Package Heat Pump
INDEX
Page
INSTALLATION. 1-4
Step 1 — Check Equipment and Jobsite ... 1
• UNPACKAGE UNITS
• INSPECT EQUIPMENT
• COMPLETE OR CONSIDER SYSTEM
REQUIREMENTS
Step 2 — Mount Heat Pump Package . 1
• ON THE GROUND: MOUNT HEAT
PUMP ON AN ELEVATED FRAME
POSITIONED ON A LEVEL CON¬
CRETE PAD
• ON THE ROOF: MOUNT UNIT ON A
LEVEL PLATFORM OR FRAME
Step 3 — Make Ductwork Connections .... 1
• CONNECT SUPPLY AND RETURN
AIR DUCTWORK
Step 4 — Provide for Cooling Cycle
Condensate Disposal . 4
• CONNECT DRAIN LINE TO UNIT
Step 5 — Make Electrical Connections .... 4
• INSTALL BRANCH CIRCUIT FUSED
DISCONNECT
• BRING LINE POWER LEADS INTO UNIT
• CONNECT GROUND LEAD TO
GROUND LUG IN SPLICE BOX
• SET INDOOR BLOWER MOTOR SPEED
• CONTROL POWER WIRING
• ELECTRIC HEATER INSTALLATION
START-UP. 6,7
SERVICE.7-12
MAINTENANCE.12,13
INSTALLATION
Step 1 — Check Equipment and Jobsite
UNPACKAGE UNITS - Move units to final
location. Slide units from cartons taking special
care not to damage unit.
INSPECT EQUIPMENT — File claim with shipping
company if shipment is damaged or incomplete.
COMPLETE OR CONSIDER SYSTEM REQUIRE¬
MENTS before installing the 50YQ units.
Consult local building codes and National
Electrical Code (NEC) for special installation
requirements.
Provide sufficient space for coil airflow clear¬
ance, wiring, and servicing unit. (See Fig. 1.)
Locate unit where supply and return air ducts can
be conveniently brought out to unit duct
connections.
Unit may be placed with duct side as close to
building as condensate drain, top removal, duct
connections and power connections permit. Posi¬
tion unit so water or ice from roof does not drop
directly on top of unit or in front of coil.
Provisions must be made for condensate drainage
and defrost water disposal.
Roof installation method for 50YQ depends on
building construction and special requirements of
local building codes. Ensure that roof can support
unit weight. Protect unit from prevailing winds to
ensure adequate defrost.
Step 2 — Mount Heat Pump Package
ON THE GROUND: MOUNT HEAT PUMP ON
AN ELEVATED FRAME POSITIONED ON A
LEVEL CONCRETE PAD - See Fig. 2 for pad
dimensions. Ensure pad does not obstruct coil slots
in unit base pan. (Slots drain water during heating
and defrost cycles. See Fig. 2 for drain slot
locations). Construct pad a minimum of 6 in. thick
to provide clearance under base pan coil slots for
drainage and ice buildup. In areas where prolonged
subfreezing temperatures or snowfall occur, in¬
crease clearance to 12 to 18 inches by constructing
an angle-iron frame to support unit 12 to 18 in. off
concrete base. Cross angle of frame must not
obstruct base pan coil slots. See Fig. 3 for rec¬
ommended frame construction. Alternate construc¬
tion should follow dimensions. Extend a 24-in.
gravel apron around pad for condensate and
defrost water drainage field.
ON THE ROOF: MOUNT UNIT ON A LEVEL
PLATFORM OR FRAME — Unit must be elevated
for proper clearance as described under ground
installation above. Roof design and water drainage
must be planned to prevent unit and its duct
flashing from sitting in water.
Step 3 — Make Ductwork Connections
CONNECT RETURN AND SUPPLY AIR DUCT¬
WORK — Connect ductwork to unit supply and
return air duct connections. Refer to Fig. 1 and
Table 1 for unit supply and return air connection
sizes and locations.
© Carrier Corporation 1978 Form 50YQ-1SI