FOR MODELS: JGI, JGM, JGN, JGP AND JGQ SECTION 4 LUBRICATION
PAGE 4-10 9/08
heat the oil from ambient to a minimum temperature prior to starting, see Table 4-5. The spe-
cific application requirements will determine which heating mode is necessary.
Circulation type heaters are recommended. All compressor models have at least one con-
nection for a heater. Four and Six throw frames have two locations. The maximum allowable
wattage per unit area for an immersion heater is 15 W/in
2
(2.3 W/cm
2
). This limit will prevent
oil from coking on the heater element and reducing the efficiency of the heater. It will also
prevent the coked oil particles from contaminating the remaining oil. JGU:Z, JGB:V and
KBB:V models are designed to use circulation heating only.
Lube Oil Analysis Sampling Point
A sampling point should be installed at a convenient location between the oil pump and the
filter. This should be installed at an easily accessible location and designed to minimize the
amount of dirt or debris that can collect around the dispensing point. A needle valve should
be used to better control the flow of the pressurized oil.
TABLE 4-4 HEAT REQUIRED TO MAINTAIN MINIMUM FRAME TEMPERATURE
MODEL
MULTIPLY TIMES DIFFERENTIAL BETWEEN OIL & AMBIENT TEMPERATURE
2-THROW 4-THROW 6-THROW
kW/°F (kW/°C) kW/°F (kW/°C) kW/°F (kW/°C)
JGM:N:Q:P 0.0086 (0.0155) --- --- --- ---
JG:A 0.0094 (0.0170) 0.0179 (0.0322) 0.0261 (0.0470)
JGW:R:J 0.0147 (0.0265) 0.0289 (0.0520) 0.0419 (0.0754)
JGH:E:K:T 0.0252 (0.0454) 0.0492 (0.0886) 0.0731 (0.1316)
JGC:D 0.0392 (0.0706) 0.0722 (0.1300) 0.1044 (0.1880)
JGU:Z 0.0534 (0.0961) 0.0944 (0.1700) 0.1319 (0.2374)
JGB:V & KBB:V --- --- 0.1295 (0.2331) 0.1768 (0.3182)
TABLE 4-5 HEAT REQUIRED TO WARM COLD COMPRESSOR FRAME & OIL
MODEL
MULTIPLY TIMES TEMPERATURE RISE DIVIDED BY TIME (h)
2-THROW 4-THROW 6-THROW
kW-h/°F (kW-h/°C) kW-h/°F (kW-h/°C) kW-h/°F (kW-h/°C)
JGM:N:Q:P 0.0275 (0.0495) --- --- --- ---
JG:A 0.0352 (0.0634) 0.0818 (0.1472) 0.1347 (0.3425)
JGW:R:J 0.0591 (0.1064) 0.1212 (0.2182) 0.1832 (0.3298)
JGH:E 0.1368 (0.2462) 0.2962 (0.5332) 0.4526 (0.8147)
JGK:T 0.1494 (0.2689) 0.3024 (0.5832) 0.4526 (0.8147)
JGC:D 0.2684 (0.4831) 0.5614 (1.0105) 0.8074 (1.4533)
JGU:Z 0.4496 (0.8093) 0.8900 (1.6020) 1.2421 (2.2358)
JGB:V & KBB:V --- --- 1.4176 (2.5517) 2.0224 (3.6403)
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