Carel pCO2 Series Application Program

Standard air-conditioning units
Carel Cod. +030221421 – Rel. 1.2 – April, 11, 2003
40
DESCRIPTION SCR ADD. TYPE DESCRIPTION SCR ADD. TYPE
Outlet fan off delay T0 38 R/W Select On-Off time bands Sunday (0=F1;
1=F2; 2=F3; 3=F4)
K5 92 R/W
Outlet fan start delay T0 39 R/W Cond. fan Speed-up time Ge-Gf 93 R/W
Compressor 1 operating hours threshold E8 94 R/W
Delay in activating minor alarm relay no.7 T3 40 R/W Compressor 2 operating hours threshold E8 95 R/W
Delay in activating serious alarm relay
no.8
T3 41 R/W Humidifier operating hour threshold E8 96 R/W
Water flow switch alarm delay T4 42 R/W Fan operating hour threshold E8 97 R/W
Delay between starts of different
compressors
T6 43 R/W Rotation mode for units in pLAN
network
Gk 98 R/W
Heater start delay T8 44 R/W Forcing delay for high ambient temp. Gm 99 R/W
Low pressure alarm delay T2 45 R/W Forcing delay for low ambient temp. Gm 100 R/W
Integration time for P+I control T1 46 R/W Interval in days for automatic rotation Gl 101 R/W
Minimum compressor off time T5 47 R/W Hour automatic rotation Gl 102 R/W
Minimum compressor on time T5 48 R/W Minutes automatic rotation Gl 103 R/W
High ambient temperature differential to
force units in network
Go 49 R/W Number of units in Standby mode Gk 105 R/W
Delay between compressor starts T6 49 R/W Automatic rotation interval for units in
pLAN
Gk 106 R/W
Low ambient temperature differential to
force units in network
Gn 50 R/W pLAN connection class board 1 (0=not
present; 1=present/no rot.;
2=present/rotation)
Cn 107 R/W
Cap. control activation delay T7 50 R/W pLAN connection class board 2 (0=not
present; 1=present/no rot.;
2=present/rotation)
Cn 108 R/W
High ambient temperature offset to force
units in network
Go 51 R/W pLAN connection class board 3 (0=not
present; 1=present/no rot.;
2=present/rotation)
Cn 109 R/W
3 position valve travel time T1 51 R/W pLAN connection class board 4 (0=not
present; 1=present/no rot.;
2=present/rotation)
Co 110 R/W
Low ambient temperature offset to force
units in network
Gn 52 R/W pLAN connection class board 5 (0=not
present; 1=present/no rot.;
2=present/rotation)
Co 111 R/W
High-low temperature-humidity alarm
delay
T2 52 R/W pLAN connection class board 6 (0=not
present; 1=present/no rot.;
2=present/rotation)
Co 112 R/W
High conductivity pre-alarm threshold Gb 53 R/W pLAN connection class board 7 (0=not
present; 1=present/no rot.;
2=present/rotation)
Cp 113 R/W
High conductivity alarm delay Gb 54 R/W pLAN connection class board 8 (0=not
present; 1=present/no rot.;
2=present/rotation)
Cp 114 R/W
Type of humidifier Cg 55 R/W Valve position driver 1 Ij 115 R
Start hour On-Off time band F1-1 K3 58 R/W Valve position driver 2 Io 116 R
22.0 EXAMPLES OF INSTALLATION
The connection of pCO1 - pCO2 boards in pLAN network allows for the following functions:
1. balancing air-conditioning units working hours by spare units (in stand-by
mode) rotation
2. spare units start-up in case other units stop due to serious alarms or black-out
3. spare units start-up to compensate for the excessive thermal load
4. controlling up to 8 air-conditioning units by a single external LCD terminal
5. operation of all air-conditioning units according to Master air-conditioning unit probes to adjust units operation
6. managing alarms printing and probes values by shared external terminal.
Connection in pLAN network allows configuring a wide range of systems. The following list includes the main system types to be possibly
created, in order of complexity, and provides suggestions for executing connections:
1. one or more independent air-conditioning units (board(s) with pLAN address 1 + external terminal(s), if any, with pLAN address 25);
2. two or more air-conditioning units and one external terminal (boards with pLAN addresses 1-8 connected with Rs485 via J11,
terminal with pLAN address 32 connected with one of the boards); this connection allows for the functions listed in the previous
paragraph;
3. two or more air-conditioning units in pLAN network, each provided with private display (boards with pLAN addresses 1-8 connected
with Rs485 via J11, terminals with pLAN addresses 25-32 connected with the relevant board); this connection allows for the functions
listed in the previous paragraph.
Networks in which boards are connected with the pLAN allow selecting the units involved in the Rotation functions, thus obtaining a mixed
network with interacting and independent units.
pLAN connection among the boards allows using a shared external terminal (add. 32) in addition to the boards private displays; this solution is
adopted where private displays are assembled on the air-conditioning units and the shared terminal is installed inside a room.
IMPORTANT: if only one board is being used, it must have pLAN address 1; no pLAN electric connection is required and the external
terminal, if any, must have pLAN address 25.

Carel pCO2 Series Specifications

General

Brand	Carel
Model	pCO2 Series
Category	Controller
Language	English