Carrier 50DQ - Manual

Carrier
installation, Start-Up
and Service Instructiôns*
50DQ
Ô16
Single-Package Heat Pump Units
INSTALLATION
General — Unit components are mounted to
eliminate vibration. Isolators are not required for
slab mounting. In some rooftop installations,
rubber pad-type isolators may be required due to
type of roof construction. For proper support of
unit, refer to Table 1 for weights. Pads, blocks, or
beams must be in contact with at least 4 in. of the
surface area at the ends and center of each rail
located at bottom of the unit. Regardless of the
type of mounting configuration, allow a minimum
of 12 in. under the outdoor coil for condensate
drainage. Increase to 18 in. where prolonged sub-
freezing temperatures exist. Refer to paragraph on
Roof Adapter Curb and Duct Adapter Fabrication.
Roof Mount — Check building codes for weight
distribution requirements. Mount unit on a level
platform or frame adequate to support unit weight
and size.
Slab Mount — Provide a level concrete slab that
extends beyond unit cabinet at least 6 in. Make
slab 8 in. thick and 4 in. above grade. Refer to
Table 1 for proper clearance under outdoor coils.
Provide a gravel apron in front of outdoor air
openings to prevent grass and foliage from ob­
structing air flow.
Rigging and Unit Placement — Inspect unit for
transportation damage. File claim with trans­
portation agency. Do not remove shipping skid
until unit is ready to be placed. Do not drop unit.
Keep unit upright. Use spreader bars to prevent
sling or cable damage to unit (Fig. 1). Level unit
using unit frame as reference.
Locate unit as close as possible to duct open­
ings. Outdoor air inlet is not affected by wind. Do
not locate unit air inlets near exhaust vents or
other sources of contaminated air. Provide clear­
ance around and above unit for air flow, safety and
service access area as shown in Fig. 2.
Although unit is weatherproof, guard against
water from higher grade runoff and overhangs. •
Table 1 — Physical Data
UNIT 50DQ
OPERATING WEIGHT (lb)
REFRIGERANT; R-22 (lb)
COMPRESSOR
Oil PP 33-2 (pf)
OUTDOOR AIR FANS
Motor Hp ... Rpm
1-ph
3-ph
Motor Frame (NEMA)
INDOOR AIR FAN SECTION
Motor Hp ... Rpm
Motor Frame (NEMA)
Motor Pulley Range (in.)
Fan Pulley (in.)
Belt; No. ... Type ... Length (in.)
Fan Speed Range
Fan Factory Setting (Rpm)
Max Allowable Fan Speed (Rpm)
Speed change per
^2 turn of motor
movable pulley flange (Rpm)
Movable pulley factory setting
turns open
Max Allowab le full turns from
closed position
PRESSU r I s TAT SETTINGS (psig)
High cutout
cut-in
Low cutout
cut-in _
DEFROST THERMO CONTACTS - Open
Close
GRAVirv
Fig. 1 - Rigging
EMERGENCY HEAT THERMO
CONJACTS_ _ _ ____ _____
FILTERS (factory-supplied)
No. ... Size
ANTICIPATOR SETTINGS
First Stage Heating Thermostat
Second Stage Heating Thermostat
1 relay
2 relays
3 relays
C L E A R ^ Q li IR E D U N D E R
OUTDOOR COILS
. Open
. Close
016
1853
34
06DB537
10
2
% .. 1075
%
1140
48
3 .. 1725
56
4.0 - 5.0
8.2
A48 ... 49.3
860-1060
980
1200
20
2
5
390 ± 5
290 + 15
29 i 5
64 + 5
43 F
105 F______
6 5 ± 6 F ^
80 ± 6 F
C leanable
2 .. 20 X 20 X 1
2 ... 20 X 25 X 1
4
.8
1.2
12 to 18 in.
(S)
© Carrier Corporation 1971 275 Form 50DQ-1SI