Viconics VZ7656E Installation Guide - Manual (Page 21)

21 | VZ7656E1000W Installation Guide
CntrlTyp
Sets how the Zones attached
to the RTU controller vote to
determine the actual system
mode of operation.
(Heat or Cool)
Default Value:
1 = AV_H3
This parameter will select the type of operation required
for the RTU based on the size of the system. Please refer
to the Viconics Zoning System Guide for recommended
settings.
Only the Zones that actually have values above 0% in
their (PIHT Wei & PICL Wei) configuration parameters
will be able to vote on the RTU operational mode
calculation.
0 =Highest: The highest PI Heating or PI Cooling
demand from the selected voting zones will dictate
heating or cooling operation of the RTU controller.
1 = AV_H3: The average of the 3 highest PI Heating or PI
Cooling demands from the selected voting zones will
dictate heating or cooling operation of the RTU controller.
2 = AV_H5: The average of the 5 highest PI Heating or
PI Cooling demands from the selected voting zones will
dictate heating or cooling operation of the RTU controller.
Dis HL
Discharge air temperature
high limit
Default: 120°F
Discharge air high temperature value at which the heating
stages will be locked out.
70°F to 150°F (21°C to 65°C)
(increments: 0.5° or 5°)
Dis LL
Discharge air temperature low
limit
Default: 45°F
Discharge air low temperature value at which the cooling
stages will be locked out.
35 to 65°F (2.0°C to 19.0°C)
(increments: 0.5° or 5°)
Anticycl
Minimum On-Off operation
time for stages
Default value = 2 minutes.
Minimum On-Off operation time of cooling & heating
stages.
IMPORTANT, anti-short cycling can be set to 0 minutes
for equipment that possess their own anti cycling timer.
Do not use this value unless the equipment has the above
mentioned internal timer. Failure to follow this guideline
may lead to damaged equipment.
0, 1, 2, 3, 4 & 5 minutes.
Heat cph
Heating stages cycles per
hour
Default value = 4 C.P.H.
Will set the maximum number of heating stage cycles per
hour under normal control operation. It represents the
maximum number of cycles that the equipment will be
turned on and off in the span of an hour.
Note that a higher C.P.H will represent a higher accuracy
of control at the expense of wearing down mechanical
components faster .
3, 4, 5, 6,7 & 8 C.P.H.