Stulz C2020 User Manual

EN/07.2013/58/57
Damper and evaporator fan regulation
With this type of regulation, if in the system the max number of unit on is three (M04 = 3), the offset will be equal to:
Offset = B / (3 * max number of units on) = S06 / (3 * M04) = S06 / (9)
Unit 1 (Leader board) Unit 2 Unit 3
Damper starts to
open at T:
T-START=CS+[0*B/9]
T-START=S01+[0*S06/(3*M04)]
T-START=CS+[1*B/9]
T-START=S01+[1*S06/(3*M04)]
T-START=CS+[2*B/9]
T-START=S01+[2*S06/(2*M04)]
Damper max
aperture at T:
T-MAX=CS+[1*B/9]
T-MAX=S01+[1*S06/(3*M04)]
T-MAX=CS+[2*B/9]
T-MAX= S01+[2*S06/(3* M04)]
T-MAX=CS+[3*B/6]
T-MAX=S01+[3*S06/(2*M04)]
Evaporator fan speed
starts to increase at T:
T-MIN=CS+[3*B/9]
T-MIN=S01+[3*S06/(3*M04)]
T-MIN=CS+[4*B/9]
T-MIN=S01+[4*S06/(3*M04)]
T-MIN=CS+[5*B/9]
T-MIN=S01+[5*S06/(3*M04)]
Evaporator fan speed
max value at T:
T-MAX=CS+[4*B/9]
T-MAX=S01+[4*S06/(3*M04)]
T-MAX=CS+[5*B/9]
T-MAX=S01+[5*S06/(3*M04)]
T-MAX=CS+[6*B/9]
T-MAX=S01+[6*S06/(3*M04)]
Compressor on:
T-ON=CS+[7*B/9]
T-ON=S01+[7*v/(3*M04)]
T-ON=CS+[8*B/9]
T-ON=S01+[8*S06/(3*M04)]
T-ON=CS+[9*B/9]
T-ON=S01+[9*S06/(3*M04)]
Compressor off:
T-OFF=CS+[6*B/9]
T-OFF= S01+[6*S06/(3*M04)]
T-OFF=CS+[7*B/9]
T-OFF= S01+[7*S06/(3*M04)]
T-OFF=CS+[8*B/96]
T-OFF=S01+[8*S06/(3*M04)]
If in a system the max number of units on is five (M04= 5), the offset will be equal to:
Offset = B / (2 * max number of units on) = S06 / (3 * M04) = S06 / (15)
4.8.7. Heating
If the leader unit isn’t sufficient to heat, it will ask the support to another unit and that one with lower number of evaporator
fan running hours will switch on its heaters. The logic function is under control of the master.
If two units aren’t sufficient to heat, a third one will be switched on following the logic of lower number of evaporator fan
running hours. The offset is equal to: Offset = S03 / (number of unit) = S03 / M04
Unit 1 (Leader board) Unit 2 Unit 3
Heaters on: T-ON = CS - [HB / 5]
T-ON = S03 - [S07 / M04]
T-ON = CS - [2 * HB / 5]
T-ON = S03 - [2 * S07 / M04]
T-ON = CS - [3 * HB / 5]
T-ON = S03 - [3 * S07 / M04]
Heaters off: T-ON = CS - [0 * HB / 5]
T-ON = S03 - [0 * S07 / M04]
T-ON = CS - [1 * HB / 5]
T-ON = S03 - [1 * S07 / M04]
T-ON = CS - [2 * HB / 5]
T-ON = S03 - [2 * S07 / M04]
In the next figure there’s an example.
Temp
Heating temp
set point
5 OFFSET 4 OFFSET 3 OFFSET 2 OFFSET 1 OFFSET
HEATING BAND
OFF
OFF
OFF
OFF
OFF
Leader
board heater
Unit 5 heater
ON
ON
ON
ON
ON
Unit 4 heater
Unit 3 heater
Unit 2 heater

Stulz C2020 Specifications

General

Brand	Stulz
Model	C2020
Category	Controller
Language	English