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The full range of HEVAC HTC and HRC Controllers and Staging Relays are
Dual Voltage,
this means they can except either a 240 VOLT
supply or a 24 VOLT Supply.
Warning:
Use only one Supply Voltage at any one time.
With the increase in radio interference being transmitted from
mobile phones etc.
As a precautionary measure, HEVAC recommends the use of Screened
Cable, earthed
at the controller end ONLY !
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When using an adjustable sensor with a HTC Analogue Controller
the Setpoint on
the Controller should be set to mid range i.e. 22.0 Degrees.
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Since 2006 all HEVAC Controllers except for the HTC DIGITAL
series no longer have a
Voltage Supply Selector switch. Wiring into the appropriate Voltage terminals
either 240Volt
or 24Volt is all that is now required.
Warning:
Use only one Supply Voltage at any one time.
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No ! The sensors for the HTC 2 & 4 Series Analogue
controller range are not compatible with the
Digital controller range.
Yes ! The sensors for the HTC
3 & 5 Series Analogue
controller range are compatible with the
Digital controller range and vice a versa.
If the Controller has either a full call for cooling or a full call
for heating and doesn't respond when you dial the setpoint knob up or down then
the possible causes might be:
 | Sensor might be open circuit (full cooling call). |
| Sensor might be short circuit (full heating call). |
| Wiring between the sensor and the controller might be open circuit
(full cooling call) |
| Wiring between the sensor and the controller might be short circuit
(full heating call) |
If the Controller has a full cooling call and doesn't respond when you
dial the
setpoint knob up or down then the possible causes might be:
| Sensor might be open circuit. |
| Wiring between the sensor and the controller might be open circuit. |
If the Controller has a full heating call and doesn't respond when you
dial the
setpoint knob up or down then the possible causes might be:
| Sensor might be short circuit. |
| Wiring between the sensor and the controller might be short
circuit. |
The HTC Analogue and Digital Series
controller range are designed for switchboard
mounting or miniature circuit breaker enclosure mounting using DIN rail.
You can though, surface mount the controller by purchasing a model
HTC-ENCLOSURE
from HEVAC Controls or you nearest HEVAC stockist.
Earlier Versions prior to Version 28 (manufactured before 1995) had an
incorrect
Leap Year Program such that the controller implements a Leap Year every
four years, but does so, two years late. The Version number of the controller
can be checked by simultaneously pushing both the "UP and the "DOWN" buttons for
approximately 5 seconds until a "00##" appears
(## = the Version Number. i.e. 27). It should be noted
that this error only affects the correct operation of the Holiday "OFF OVERRIDE"
program, and not the normal weekly operation of the controller. This problem is
normally bypassed by the very fact that the Holiday's have to be reprogrammed
each year anyway (if this function is being used) and at the same time the Clock
and Date should be checked and corrected if required.
A transposition table showing Terminal wiring for the OLD
Series 1 HTC-4 and Terminals for the new
HTC-4 Series 2 is available form our Download area.
Go to the Download
Area
If the internal battery in your HTC-DIGITAL or
HTC-DIGITAL-TC needs to be replaced you can purchase
the following Lithium coin cell battery models CR1220 or
DL1220.
The battery is readily available from HEVAC or from any of the following
retailers.
DICK SMITH ELECTRONICS, TANDY ELECTRONICS, RADIO PARTS, JAYCAR ELECTRONICS
If the internal battery in your SRT-LCD series
digital display sensor needs to be replaced you can purchase the following
Lithium coin cell battery models LR44, A76,
V13GA or PX76A.
The battery is readily available from HEVAC or from any of the following
retailers.
DICK SMITH ELECTRONICS, TANDY ELECTRONICS, RADIO PARTS, JAYCAR ELECTRONICS
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