Heat Cartridges - Viking pump 323A Series Technical & Service Manual

2. Loosen locknut (which locks adjusting screw so pressure
setting will not change during operation of pump).
3. Install a pressure gauge in discharge line for actual
adjusting operation.
4. Turn adjusting screw in to increase pressure and out to
decrease pressure.
5. With discharge line closed at point beyond pressure
gauge and pump running, gauge will show maximum
pressure that the valve will allow (full bypass).
IMPORTANT
In ordering parts for pressure relief valve, always give
model number and serial number of pump as it appears on
nameplate and name of part wanted. When ordering springs,
be sure to give pressure setting desired.

HEAT CARTRIDGES

This section applies to 324E Series only.
INSTALLATION INSTRUCTIONS:
WARNING !
The pump needs to be properly grounded
before the heat cartridges are installed.
FIGURE 15 - HEAT CARTRIDGE AND THERMOCOUPLE LOCATIONS
Pump Size
N
TABLE 1 - NUMBER OF HEAT CARTRIDGES IN EACH PUMP MODEL
THERMOCOUPLE
Wattage By Pump Size
Numbers of Heaters in Head
2
1. Spacers should be installed between the foot of the
pump and the base. This will create an air gap between
the pump and base to limit heat transfer to the base.
2. Coat the threads of the heat cartridge with an anti-seize
compound prior to installation. Install heat cartridges into
the tapped ports on the head and bracket in the locations
shown in Figure 15 below. Figure 15 also shows the
location for the thermocouple. The number of heaters
used and the total wattage for each pump size is given in
Table 1 below. ¾" heat cartridges should be tightened to
20 ft-lbs.
3. Viking recommends installing a closed loop temperature
controller with a control algorithm that will minimize or
prevent overshooting the set point temperature. The set
point temperature needs to be slightly higher than the
melting point and significantly lower than the flash point
or boiling point of the liquid being pumped. Viking does
offer a controller for use with our heat cartridges. Ask
your local Viking distributor for details.
WARNING !
Setting the set point temperature higher
than necessary will not make the pump
heat any faster and will shorten the life
of the heat cartridges.
4.
Properly insulate the pump to minimize heat loss.
The pump will not heat properly if it is not insulated.
HEAT
CARTRIDGES
Number of Heaters in Bracket
2
SECTION TSM 630.3
Total Wattage
2500
ISSUE L PAGE 11 OF 12