VICI ITC - Manual (Page 18)

2.5 Installation
The following discussion is intended to assist you in the initial installation of an
ITC. It is assumed that you have read the foregoing portions of this manual.
Check the instrument for shipping damages. Open the instrument and check for
loose components. There shouldn’t be any. In the event that damage is noted,
notify the carrier immediately. Valco assumes no responsibility for damage incurred
in shipment.
Assuming no damage is seen, perform the following checkout. You will need an
ordinary incandescent light or other resistive load that provides indication of when
power is applied.
1. Connect the load to the ITC. In 110V models, a receptacle (labeled P1) is
provided which accepts ordinary three-wire appliance plugs. The 220V uses a
cinch socket.
2. Connect the instrument to a suitable source of 120V AC.
3. Set the setpoint and attenuation switches to 0. Switch the instrument on. The
TCPL indicator should illuminate momentarily. (The instrument is determining
whether or not its thermocouple is OK.) The HTR indicator should be OFF.
4. After allowing the instrument to warm up for a few minutes, increase the
setpoint until the HTR indicator flashed with a 50/50 duty cycle. The setpoint
should approximate the ambient temperature.
5. Hold the thermocouple’s measuring junction firmly in one hand. Since your
skin temperature is usually 10° above ambient (and subsequently, the setpoint),
the HTR indicator should cease flashing.
6. Increase the setpoint until the HTR indicator is ON continuously. (Try 50°.)
Change the power attenuation switch to 9. The HTR indicator should flicker faintly.
Progressively decrease the ATTN setting, noting that the HTR indicator "bright-
ness" increases at each position. When the ATTN switch is at zero, the HTR indi-
cator should be ON continuously, with no visible flickering.
Regarding the zone heater specifications, care should be taken to avoid exceeding
the ITC’s specifications for switched power. The ITC10 will switch loads up to
1000 watts. If you attempt to exceed this rating, the instrument will probably sacri-
fice its fuses and/or power triac.
The present ITC power circuitry is intended to switch resistive loads only. This
means that inductive loads, such as electric motors, solenoids, and especially
variacs cannot be switched successfully.
Damage may result if inductive loads are used.
Always use three-wire power connections for the instrument, as well as heater
connection. (Ref. Section 2.2.) It is important that the heater block, etc. be
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