SM/SV-Space Master Unit Coolers (E316008_B)
10
6.5
EXPANSION VALVE
Before mounting the unit, install the expansion valve and connect the equalizer tube. The expansion valve
should be installed directly to the distributor body or as close as possible with no elbows or bends. Locate the
expansion valve bulb on a horizontal length of suction line as close to the suction header as possible. Position
the bulb in a 3, 4 or 8, 9 o’clock position (do not position on the bottom side of the pipe). Clamp the bulb down
flush and tight against the pipe and insulate. Never locate the bulb in a trap or downstream from a trap.
Expansion valves are adjusted at the factory prior to shipment. The setting will be correct for many applications,
but in other applications adjustments may be needed. It is important that the operation of the expansion valve be
checked after the system has balanced out at the desired room temperature. If the coil is being starved it is
necessary to reduce the superheat setting of the valve by turning the adjusting stem counter-clockwise. If the
superheat is too low it is necessary to increase the superheat setting of the valve by turning the adjusting stem
clockwise. It is recommended that for a 10 F to 12 F T.D. system, the valve should be adjusted to maintain 5 F
to 6 F superheat.
7
ELECTRICAL
7.1
FIELD WIRING
Field wiring should comply with NEC and local codes. The power supply voltage, phase and frequency must
match what is shown on the unit cooler data plate.
The field-wiring compartment is constructed as part of the unit cooler enclosure. The wiring diagram for each
unit is located on the inside of the electrical panel door. Wiring connections are made at the terminal block(s)
provided inside the unit on the end opposite the refrigerant connections. The unit must be grounded. Refer to
tables 3, 4, and 5 for motor and heater electrical information.
7.2
ELECTRICAL DATA
Table 4 SM MOTOR ELECTRICAL DATA (AMPS)
FAN Q-ty 230/60/3 460/60/3 575/60/3
1
4.00
2.00
1.45
2
8.00
4.00
2.90
3
12.00
6.00
4.35
4
16.00
8.00
5.80
Table 5 SV MOTOR ELECTRICAL DATA (AMPS)
FAN Q-ty 230/60/3 460/60/3 575/60/3
1
7.00
3.50
2.60
2
14.00
7.00
5.20
3
21.00
10.50
7.80
4
28.00*
14.00
10.40
*Total 24 amps wired in two circuits.
