Viconics VBZS Application Guide User Manual
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5B) Proper Commissioning RTU Controllers
At the
RTU level, care should be applied to insure the following:
-
Proper sizing of the RTU heating and cooling capacity to insure it will meet the highest
instantaneous peak loads of the areas being served by the system.
-
Proper strategy and system layout of the mechanical system architecture.
-
Proper commissioning and verification of the by-pass system. A incorrectly set-up by-pass damper
system can result in all of the zones being properly commissioned and all equipment being
properly sized, but can still cause the system to not receive the proper RTU capacity down to the
zones.
-
Proper setup of the following important configuration parameters: Heating lockout, cooling lockout,
control type strategy, discharge air low and high limits, static pressure sensor range and static
pressure setpoint. All of which need to be properly evaluated and set according to the
specifications of the installation.
-
Proper verification of RTU I/O operation including the RTU on board economizer operation.
5C) Operational System Checklist
It is recommended to keep a checklist of all milestones and configuration settings during start-up. This list
should be kept as a reference with the system when it is fully commissioned. The following is only provided
as a guideline template but can be extremely helpful for servicing issues and questions.
RTU Unit
Manufacturer:
Serial number
Model number:
Year of manufacture
Location:
Date of original installation
Cooling tonnage:
Cooling number of stages:
Heating capacity:
Heating number of stages:
Maximum CFMs:
Total number of zones:
RTU Configuration, critical operational configuration parameters are in bold
RTC MAC
cal RS
RTC Baud
cal OS
Lockout
H
stage
Pwr del
C stage
CntrlTyp
H
Lock
Dis HL
C Lock
Dis LL
2/4event
Anticycl
Aux
cont
Heat cph
Prog rec
Cool cph
Occ CL
Deadband
Occ
HT
Units
Unocc
CL
Fan del
Unocc HT
BI 1
Sp range
TOccTime
Pressure
RTU Local Schedule Settings
2 events
4 events
Occupied
day?
1
st
Occ event
2
nd
Unocc event 3
rd
Occ event
4
th
Unocc event
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
Bold items are critical for proper system operation