44
HVAC Mode — FREEZESTAT TRIP (25)
— If the freeze-
stat trips, the unit enters the Freezestat Trip HVAC mode. The
supply fan will run, the hydronic heat valve will be wide open,
and the economizer damper will be closed.
HVAC Mode — PLEN.PRESS.FAIL (26)
— The unit is off
due to a failure of the plenum pressure switch.
HVAC Mode — RCB COMM FAILURE (27)
— The unit is
off due to a Rooftop Control Board (RCB) communication fail-
ure.
HVAC Mode — SUPPLY VFD FAULT (28)
— The unit is
off due to a supply fan VFD fault or supply fan VFD communi-
cations loss.
Unit Configuration — There is a sub-menu under the
Configuration mode of the local display entitled UNIT. This
sub-menu contains an assortment of items that most of which
are relative to other particular sub-sections of this control man-
ual. This section will define all of these configurations here for
easy reference. The sub-menu which contains these configura-
tions is located at the local display under Configura-
tion
UNIT. See Table 25.
Machine Control Type (
C.TYP) — This configuration de-
fines the technique and control source responsible for selecting
a cooling mode and in determining the method by which com-
pressors are staged.
The types possible will now be defined:
• C.TYP = 1 (VAV-RAT) and C.TYP = 2 ( VAV- S P T )
Both of these configurations refer to standard VAV oper-
ation. If the control is occupied, the supply fan is run
continuously and return-air temperature will be used for
both in the determination of the selection of a cooling
mode. VAV-SPT differs only in that during the unoccu-
pied period, space temperature will be used to "kick
start" the fan for 10 minutes before the return-air temper-
ature is allowed to call out any mode.
• C.TYP = 3 (TSTAT - MULTI )
This configuration will force the control to monitor the
thermostat inputs to make a determination of mode. But
unlike traditional 2-stage thermostat control the unit is
allowed to use multiple stages of cooling control and per-
form VAV style operation. Essentially the control will be
able to call out a LOW COOL or a HIGH COOL mode
and maintain a low or high cool supply air set point.
• C.TYP = 4 (SPT - MULTI )
This configuration will force the control to monitor a
space temperature sensor to make a determination of
mode. But unlike traditional 2-stage space temperature
control, the unit is allowed to use multiple stages of cool-
ing control and perform VAV style operation. Essentially
the control will be able to call out a LOW COOL or a
HIGH COOL mode and maintain a low or high cool sup-
ply air set point.
Unit Size (75-150) (
SIZE) — There are several available ton-
nages for the N Series control. Make sure this configuration
matches the size called out by the model number of the unit.
This is important as the cooling stage tables are directly deter-
mined based on the SIZE configuration.
Fan Mode (
CV.FN) (0= Auto, 1= Cont) — This Fan Mode
configuration can be used for machine control types (Configu-
ration
UNIT
C.TYP) 3, 4, 5 and 6.
The Fan Mode variable establishes the operating sequence
for the supply fan during occupied periods. When set to 1 =
Continuous, the fan will operate continuously during occupied
periods.
When set to 0 = Automatic, the fan will run only during a
heating or cooling mode.
Remote Switch Configutation (
RM.CF) — The remote
switch input is connected to TB201 terminals 1 and 2. This
switch can be used for several remote control functions. Please
refer to the Remote Control Switch Input section on page 96
for details on its use and operation.
CEM Module Installed (
CEM) — This configuration in-
structs the control to communicate with the Controls Expan-
sion Module (CEM) module over the local equipment network
(LEN) when set to YES. When the unit is configured for cer-
tain sensors and configs, this option will be set to YES auto-
matically.
The sensors and configurations that automatically turn on
this board are:
Configuration
UNIT
SENS
SRH.S = Enable (Space
Relative Humidity Sensor Enable)
Configuration
UNIT
SENS
RRH.S = Enable (Re-
turn Air Relative Humidity Sensor Enable)
Configuration
UNIT
SENS
MRH.S = Enable
(Mixed Air Relative Humidity Sensor Enable)
Table 25 — Unit Configuration
ITEM EXPANSION RANGE UNITS CCN POINT DEFAULTS
UNIT UNIT CONFIGURATION
C.TYP Machine Control Type 1 to 4 CTRLTYPE 3
SIZE Unit Size (75-150) 75 to 150 UNITSIZE 75
FN.MD Fan Mode (0=Auto, 1=Cont) 0 to 1 FAN_MODE 1
RM.CF Remote Switch Config 0 to 3 RMTINCFG 0
CEM CEM Module Installed No/Yes CEM_BRD No
LQ.SN Liquid Sensors Installed No/Yes LQ_SENS No
PW.MN Power Monitor Installed No/Yes PWR_MON No
VFD.B VFD Bypass Enable? No/Yes VFD_BYEN No
UVC.L UV-C Lamp Config? 0 to 2 UVCL_CFG 0
TSC.C Temp.Cmp.Strt.Cool Factr 0 to 60 Minutes TCSTCOOL 0
TSC.H Temp.Cmp.Strt.Heat Factr 0 to 60 Minutes TCSTHEAT 0
SFS.S Fan Fail Shuts Down Unit No/Yes SFS_SHUT No
SFS.M Fan Stat Monitoring Type 0 to 2 SFS_MON 0
VAV.S VAV Unocc.Fan Retry Time 0 to 720 Minutes SAMPMINS 50
MAT.S MAT Calc Config 0 to 2 MAT_SEL 1
MAT.R Reset MAT Table Entries? No/Yes MATRESET No
MAT.D MAT Outside Air Default 0 to 100 % MATOADOS 20
ALTI Altitude……..in feet: –1000 to 60000 ALTITUDE 0
DLAY Startup Delay Time 0 to 900 Seconds DELAY 0
AUX.R Auxiliary Relay Config 0 to 3 AUXRELAY 0
SENS INPUT SENSOR CONFIG
SPT.S Space Temp Sensor Disable/Enable SPTSENS Disable
SP.O.S Space Temp Offset Sensor Disable/Enable SPTOSENS Disable
SP.O.R Space Temp Offset Range 1 to 10 SPTO_RNG 5
SRH.S Space Air RH Sensor Disable/Enable SPRHSENS Disable
RRH.S Return Air RH Sensor Disable/Enable RARHSENS Disable
MRH.S Mixed Air RH Sensor Disable/Enable MARHSENS Disable
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