13
installation
&
operation
manual
|
dlv
heating
system
4
HEATING SYSTEM START-UP
WARNING
!
Hazardous voltage:
Before wiring, servicing or cleaning the heating system, turn off the power and follow
your organization’s lockout and tagout procedure. Failure to do so could allow others to turn on the power
unexpectedly, resulting in harmful or fatal electrical shock.
NOTICE
Pump damage:
Do not run the motor/pump assembly dry for more than a few seconds. Running a pump
that is not completely filled with fluid will cause damage to the pump seal.
Proper heating operation:
The high-limit temperature control relay (TCR2 and TCR4) must be set at least
18
°
F (10
°
C) higher than the corresponding control temperature control relay (TCR1 and TCR3) for proper
heating operation. This will prevent nuisance tripping of the high-limit circuit.
1.
Check and tighten all electrical and plumbing connections.
2.
Ensure isolation valves are
open
before energizing the system.
3.
If you are operating a three-phase heating system,
check for proper rotation of the pump motor
.
Turn and hold the
on
/
off
/
prime
switch to
prime
to check the pump for proper rotation.
OOICE!
Do not run the motor/pump assembly dry for more than a few seconds.
If the pump motor is not
rotating in the correct direction, switch any two electrical leads at the main power terminal block.
OOE:
Single-phase systems are prewired to ensure the pump motor rotates in the correct direction.
4.
Bleed all trapped air from the heating system by opening a plug or pipe fitting at or near the pump.
Turn and hold the
on
/
off
/
prime
switch to
prime
to evacuate any remaining air in the lines.
OOE:
When priming the pump, the pressure gauge should indicate an increase in pressure. Your system’s
operating pressure may vary depending on the configuration of the engine.
5.
Turn the
on
/
off
/
prime
switch to
on
to energize the heating system.
6.
Once operation is satisfactory, turn the control dials on the temperature control relay TCR1 to the
desired temperature setting for engine coolant. HOTSTART recommends a control temperature on
TCR1 of 122 °F (50 °C). The high-limit temperature setting on TCR2 should be set at 194 °F (90 °C).
See
SECOIO 3.5
and
SECOIO 3.6
.
7.
Turn the control dials on the temperature control relay TCR3 to the desired temperature setting for
engine oil. HOTSTART recommends a control temperature on TCR3 of 104 °F (40 °C). The high-limit
temperature setting on TCR4 should be set at 194 °F (90 °C).
See
SECOIO 3.5
and
SECOIO 3.6
.
