50VR-K: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
11
If an accessory electric heater is installed, low voltage leads from heater
must be connected to factory supplied control leads from Indoor Fan
Board P4 connector.
NOTE: If the unit 24V wires do not have a matching receptacle, cut the
24V wires from the electric heater plug, strip the ends, and wire nut
together to match the schematic connections. If the electric heater 24V
wires do not have a matching plug, cut the 24V wires from the unit
receptacle, strip the ends, and wire nut together to match the schematic
connections.
Factory wires are provided for electric heat staging W1 and W2 (W2 and
W3 on IFB). If room thermostat has only one stage of supplemental heat,
connect white and violet wires shown in Fig. 10 to second stage heat
field wire.
Some electric heaters have four control wires (plus common wire).
Consult unit wiring diagram and electric heater wiring diagram for
additional details.
Transformer Protection
The transformer is of the energy-limiting type, however a direct short
will likely blow a secondary fuse. If an overload or short is present,
correct overload condition and check for blower fuse on Indoor Fan
Board. Replace fuse as required with correct size and rating.
Table 1 – Physical Data
UNIT SIZE 24 36 48 60
NOMINAL CAPACITY (ton) 2 3 4 5
SHIPPING WEIGHT lb.
SHIPPING WEIGHT (kg)
347
157
420
191
462
210
511
232
COMPRESSORS
Quantity
Scroll
1
REFRIGERANT (R-410A)
Quantity lb
Quantity (kg)
8.2
3.7
10.0
4.5
12.0
5.4
16.6
7.5
REFRIGERANT METERING DEVICE TXV, Indoor TXV
ORIFICE
ID (in.)
ID (mm)
.032 (2)
0.81 (2)
.042 (2)
1.07 (2)
.042 (2)
1.07 (2)
.052 (2)
1.32 (2)
OUTDOOR COIL
Rows...Fins/in.
Face Area (sq ft)
1...21
18.8
2...21
13.6
2...21
17.5
2...21
23.3
OUTDOOR FAN
Nominal Cfm
Diameter in.
Diameter (mm)
Motor Hp (Rpm)
2100
24
609.6
1/12 (800)
3000
26
660.4
1/5 (810)
3300
26
660.4
1/5 (810)
3600
26
660.4
1/5 (810)
INDOOR COIL
Rows...Fins/in.
Face Area (sq ft)
3...17
3.7
3...17
4.7
3...17
5.7
4...17
5.7
INDOOR BLOWER
Nominal Low Stage Cooling Airflow (Cfm)
Nominal High Stage Cooling Airflow (Cfm) Size in.
Size (mm.)
Motor HP (RPM)
675
855
10x10
254x254
1/2 (1050)
900
1200
11x10
279.4x254
3/4 (1000)
1200
1600
11x10
279.4x254
1.0 (1075)
1400
1750
11x10
279.4x254
1.0 (1075)
HIGH-PRESSURE SWITCH
(psig) Cut-out Reset (Auto)
650 +/- 15
420 +/- 25
LOW-PRESSURE SWITCH
(psig) cut-out Reset (auto)
20 +/- 5
45 +/- 5
RETURN-AIR FILTERS
*
Throwaway Size in.
Throwaway Size (mm)
*. Required filter sizes shown are based on the larger of the AHRI (Air Conditioning Heating and Refrigeration Institute) rated cooling airflow or the heating airflow velocity of
300 ft/minute for throwaway type or 450 ft/minute for high-capacity type. Air filter pressure drop for non-standard filters must not exceed 0.08 in. W.C.
If using accessory filter rack refer to the filter rack installation instructions for correct filter sizes and quantity.
20x20x1
508x508x25
24x30x1
610x762x25
24x36x1
610x914x25
Table 2 – Minimum Airflow for Safe Electric Heater Operation (CFM)
SIZE 24 36 48 60
Cfm 850 1200 1600 1750
To Next Page
Loading...
