WaterFurnace Series NXW - Manual (Page 31)

31
ENVISION 2 NKW 50Hz REVERSIBLE CHILLER INSTALLATION MANUAL
Compressor Resistance
Thermistor Resistance
Operating Limits
Operating Limits
Cooling Heating
(°F) (°C) (°F) (°C)
Source Side Water Limits
Min. Entering Water 30 -1.1 30 -1.1
Normal Entering Water 85 29.4 60 15.6
Max. Entering Water 110 43.3 90 32.2
Load Side Water Limits
Min. Entering Water 50 10.0 60 15.6
Normal Entering Water 60 15.6 100 37.8
Max. Entering Water 90 32.2 120 48.9
Notes:
Minimum/maximum limits are only for start-up conditions, and are meant for bringing the space up to occupancy temperature. Units
are not designed to operate at the minimum/maximum conditions on a regular basis. The operating limits are dependant upon three
primary factors: 1) entering source temperature, 2) entering load temperature, and 3) flow rate (gpm). When any of the factors are at
the minimum or maximum levels, the other two factors must be at the normal level for proper and reliable unit operation. Consult the
Capacity Tables for each model to determine allowable normal operating conditions. Units are not designed for outdoor installation.
Compressor Resistance Chart
Model 380-400V
120 2.116 / 2.088 / 2.072
180 1.29 / 1.28 / 1.33
240 1.13 / 1.11 / 1.10
360 .83 / .83 / .83
600 0.52 / .52 / .52
10/7/2014
Resistance values listed in ohms and measured at 25C between phases 1-2, 1-3, 2-3, respectively.
Specialized measurement device should be used for accurate resistance readings due to low resistance values.
Thermistor Resistance
Thermistor FX10
Temperature (°C) Resistance (Ohms)
-15 746-770
-10 775-803
-5 808-836
0 841-869
5 875-903
10 910-938
15 946-974
20 981-1013
25 1019-1051
30 1058-1090
35 1097-1129
40 1137-1169
45 1179-1211
50 1221-1253
55 1261-1297
60 1305-1341
65 1350-1386