Sterlco Micro Series Water Temperature Control Unit - Manual (Page 23)

MICRO Series Water Temperature Control Units Page 23
Chapter 4: Identifying Controls and Features
4-1 Identifying Mechanical Controls and Features
To Process Probe
One (1) type K thermocouple probe is included with your MICRO temperature
control unit. It is located in the heater tank to sense TO PROCESS temperature.
Safety Thermostat
The safety thermostat mounted on the side of the heater tank protects against
thermal runaway. The thermostat guards against the unlikely event of “runaway”
heating. If overheating occurs, the safety thermostat shuts down heater outputs.
The unit continues to pump water through the system to prevent heater damage.
We recommend that you install an audible or visual alarm to the terminals
provided. Factory installed alarms are available; see the electrical schematics in
Figure 3 on Pages 23 and 24 for more information.
Pressure Relief Valve
If the combined pressure of the cooling supply water and pump discharge
exceeds 150 psig (1,034.25 kPa/10.34 bars), the pressure relief valve opens and
relieves the pressure. This is a non-adjustable ASME construction valve with a
stainless steel spring.
Important!
Route a pipe from the pressure relief valve
to a suitable drain to reduce potential scalding hazard.
The drain line must not have any restrictions or back pressure.
Low Pressure Cutout Switch
This switch, set at 16 psig with a 2 psig differential (110.3 kPa/ 1.10 bars with a
13.79 kPa/0.14 bars differential) shuts down the unit if the COOLING WATER
IN or MAKEUP water pressure drops below 16 psig (110.3 kPa/1.10 bars).
Pumps
Pumps range in power from ½ hp to ¾ hp (0.37 kW to 0.56 kW) and are
equipped with 3-phase ODP motors and seal flush lines as standard.
The pump is a stamped stainless steel, bronze-fitted close-coupled centrifugal
type. It features a split case design to facilitate replacement of the seal. It has a
high output capacity with excellent discharge pressure helping it facilitate
turbulence to maximize heat transfer, and is well suited for the conditions under
which it was designed to operate.