Bryant 541A - Manual (Page 2)

Table 1 — Physical Data
UNIT 541A 120 180
OPERATING WEIGHT (lb) 750 803
REFRIGERANT R-22 R-22
Operating Charge (lb)* 30 37
COMPRESSOR Recip Hermetic; 1750 Rpm
Model No. 06DF824 06DF537
Cylinders 6 6
Oil (pts) 10 10
Crankcase Heater (Watts) 180 180
OUTDOOR AIR FANS Direct Drive — Axial Flow
Number 2 2
Speed (rpm) 1075 1075
Diameter (in.) 26 26
Motor Hp 1 ⁄ 2 1 ⁄ 2
Airflow (cfm) 11,000 11,000
kW (total) 1.46 1.46
OUTDOOR COIL Plate Fins; 15 Per Inch
Rows Deep 2 3
Face Area (sq ft) 29.2 29.2
Storage Capacity (lb)† 27.2 40.1
CONTROLS
High-Pressure Switch (HPS)
Cutout (psig) 400
Cut-in (psig) 300
Loss-of-Charge Switch
(Liquid Line)
Cutout (psig) 7 Ϯ 3
Cut-in (psig) 22 Ϯ 5
Head Pressure
(No. 2 Fan Cycling)**
Opens (psig) 160 ± 10
Closes (psig) 255 ± 10
Oil Pressure Switch (Differential)
Set Point (psig)
(Close on Rise) 9.5 Ϯ 1
(Open on Fall) 5
Defrost Pressure Switch (HPS2)
Opens (psig) 280 Ϯ 10
Closes (psig) 180 Ϯ 2
THERMOSTAT
Defrost Switch
Opens (F) 65 80
Closes (F) 27 27
*Approximate charge with 25 ft of interconnecting piping. Use
appropriate charging charts for actual charging of unit.
†Refrigerant storage capacity at 120 F condensing temperature with
condenser 80% full of liquid.
**Head pressure control on cooling cycle only.
B. Locate Unit
For service access and unrestricted airflow, provide 2 ft clear-
ance on each end of unit and 3 ft clearance on each side of
unit. Position unit so that there is unrestricted airflow above
unit.
NOTE: Before mounting unit, remove 4 holddown brackets
and release skid.
If conditions or local codes require unit to be fastened to
pad, use the mounting holes in the 4 unit mounting feet (see
Fig. 1).
C. Mount Unit
The unit may be mounted on a solid, level concrete pad, on
accessory mounting legs, or on field-supplied raised supports
at each mounting position. (Note that mounting hardware is
field supplied.)
Weight distribution (shown in Fig. 3 and Table 2) determines
the type of support required. Bolt unit securely to pad or sup-
ports after unit is in position and is level. Be sure to mount
unit level to ensure proper oil return to compressors. Mount-
ing holes on unit can be used to secure unit to vibration iso-
lators, if required.
D. Compressor Mounting
As shipped, compressor is held down by 4 bolts. After unit is
installed, loosen each bolt using locknut shown in Fig. 4 un-
til flat washer (
3 ⁄
8
in.) can be moved with finger pressure.
III. STEP 3 — COMPLETE REFRIGERANT PIPING
CONNECTIONS
Refrigerant lines must be carefully designed and constructed
to ensure equipment reliability and efficiency. Line length,
pressure drop, compressor oil return, and vertical separation
are several of the design criteria that must be evaluated. See
the following sections.
IMPORTANT: Piping must be properly sized and installed for
the system to operate efficiently.
A. Check Vertical Separation
If there is any vertical separation between the indoor and out-
door units, check Table 3 to ensure that the separation is within
allowable limits. Relocate equipment if necessary.
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