Airedale StoreMaster 50kW - 77kW - Manual (Page 31)

Comfort STOREMASTER
™
Comfort Range
31
Technical Manual : 6678403 V1.3.0_ 02_2013
Performance Data
FAN PERFORMANCE - SUPPLY AIR
Input voltage signal The input voltage signal to the fan speed controller from the unit microprocessor (Vdc)
sets the fan speed for design performance.
The voltage can be determined from the graphs at design air volume using the Total
Static Pressure:
ESP ISP TP
 
Where:
TP
= Total static pressure
ISP = Internal Unit static pressure at 0Pa ESP
ESP = External static pressure at design conditions
Internal static pressure The IP at 0Pa ESP can be determined at design air volume using the system lines
provided on the graphs. 3 lines are shown on the graph representing the different internal
system pressure characteristics for each heating option:
1 = 0Pa ESP with gas fired heating
2 = 0Pa ESP with LPHW/Electric heating
3 = 0Pa ESP cooling only
Select the correct internal system line for the chosen design.
Example STM50R
Air volume, design = 3.0 m³/s
External static pressure, design = 120 Pa
Internal static pressure, from graph = 138 Pa with gas fired heating
Total static pressure, calculate = 120 + 138 = 358 Pa
Input signal voltage, from graph = 1030 rpm (7.8 V)
.
STM50
Minimum Air
Volume
Minimum Air Volume
with Gas Heating
Maximum Air
Volume
800
700
600
500
400
300
200
Sta
tic
Pre
s
s
ure
(Pa
)
100
1
2
3
1320 rpm (10V)
1150 rpm (8.7V)
950 rpm (7.3V)
750 rpm (5.9V)
0
2
.5
0
2
.7
5
3
.0
0
3
.2
5
3
.5
0
3
.7
5
Air Volume m³/s
358 Pa
138 Pa