Page 17 ZC-KI6_VSS1709
Check fan for dust once a year. If dirty,
vacuum to remove dust. Keeping the fan
blades clean will reduce noise and
improve the capacity and efficiency of
the heating system.
Pump
The circulating pump is water lubricated
and should require no regular
maintenance. A cycle timer feature is
available on the Vortex control to
exercise the pump even during
prolonged periods of no heat to avoid
seizing from long idle periods.
TROUBLESHOOTING
Also refer to the controls
troubleshooting guide.
Thermostat Call Error
Thermostat calls are displayed on the
8_gang relay board. ANY valid heating
call will be illuminated as well as the
pump relay LED. Likewise, ANY valid
cooling call will illuminate as well as
AIR_COND LED.
If both Z1_HEAT and Z2_COOL are on
at the same time, there is a thermostat
error. Check wiring and that the
thermostat is set as a regular heat/cool
and not heat pump mode.
Calls on thermostats two, three and four
are ignored if the air handler system
(through zone one) has not switched
over to the same season. For example,
if zone one is in heating mode, any
cooling call on zones 2, 3 or 4 are
ignored and Z2_CALL, Z3_CALL and
Z4_CALL will not illuminate. If the air
handler does not run when zones two,
three or four are calling, activate the
primary zone briefly ( at least 5 seconds)
to set the air handler in heating or
cooling mode. Note that some
thermostats have a delay (typically five
minutes) before they will start the air
handler in cooling the first time.
Relay failure – a 24vac DPDT relay acts
as a latching relay for zones 2 and 3 to
prevent incorrect thermostat calls from
reaching the control. A second relay
may be present for zones 4 and 5.
Wrong Zones Operating
Change the damper wires on the
terminal block. Refer to the labels on the
thermostat wires and colour code at the
damper connections.
Pump does not run
The pump is activated by a 12vdc DPDT
relay powered by the control. One side
runs the pump (120vac) and the other
side provides a dry contact (TT) for a
boiler. If the PUMP LED is illuminated
but the pump does not run, the issue is
the pump.
• Seized due to lime build-up; clean
or replace
• Air bound (re-purge)
• Valves closed in error
Second Stage Air Conditioning
Second stage air conditioning is
activated by a 12vdc DPDT relay
powered by the control. Only one set of
contacts is used to provide 24vac to the
air conditioner second stage. First stage
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