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5B) Proper Commissioning RTU Thermostats
At the
RTU level
, care should be applied to insure the following conditions are met:
-
Proper sizing of the RTU heating and cooling capacity to insure it will meet the highest
instantaneous peak loads of the areas deserved by the system.
-
Proper strategy and system layout of the mechanical system architecture.
-
Proper commissioning and verification of the by-pass system. A wrongly configured by-pass
system may cause all the zones in a section of the system unable to get the proper RTU capacity
down to the zones. Even when all of the zones are properly commissioned and all equipment are
properly sized.
-
Proper setup of the 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 these 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
TOccTime
RTC Baud
cal RS
PAN ID
cal
OS
Channel
H
stage
Lockout
C
stage
Pwr del
H Lock
CntrlTyp
C
Lock
Dis HL
2/4event
Dis LL
Aux cont
Anticycl
Prog
rec
Heat cph
Occ CL
Cool cph
Occ HT
Deadband
Unocc
CL
Units
Unocc
HT
Fan del
Sp range
BI 1
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
RTC Baud refers to BACnet models only
PAN ID and Channel refers to Wireless models only
