Zehnder Rittling VS Series Installation, Operation And Maintenance Manual page 5

Nomenclature
VS series, chassis
1, 2, 3, 4 5, 6 7
VHCH 09 A
Unit type
VHN = Vertical Stack Water Source Heat Pump complete
Nominal capacity
09 = 9,000 BTU/Hr
12 = 12,000 BTU/Hr
15 = 15,000 BTU/Hr
18 = 18,000 BTU/Hr
24 = 24,000 BTU/Hr
30 = 30,000 BTU/Hr
36 = 36,000 BTU/Hr
Voltage
A = 208-230V/60/1
B = 277V/60/1
Heat exhanger
1 = Copper coax with air coil
Flow regulator
X = None
A = 1/2", 1.5 GPM (1, 2)
B = 1/2", 2.0 GPM (1, 2)
C = 1/2", 2.5 GPM (1, 2)
D = 1/2", 3.0 GPM (1, 2)
E = 3/4", 2.0 GPM (3, 4)
F = 3/4", 2.5 GPM (3, 4)
G = 3/4", 3.0 GPM (3, 4, 5)
H = 3/4", 3.5 GPM (5, 6)
I = 3/4", 4.0 GPM (5, 6)
J = 3/4", 5.0 GPM (5, 6, 7)
K = 3/4", 6.0 GPM (5, 6, 7)
L = 3/4", 7.0 GPM (6, 7)
M = 3/4", 8.0 GPM (6, 7)
N = 3/4", 9.0 GPM (7)
O = 3/4", 10.5 GPM (7)
8 9 10
1 D A
11 12 13
X A 1
14 15 16, 17
A - AA
Special option codes
AA = Standard
Placeholder
Revision level
A = Rev. 1
Air filter
1 = Washable
2 = 1" throwaway
Hose kit (3')
X = None
A = 1/2"
B = 3/4"
Y strainer
X = None
A = 1/2" Y strainer (09, 12)
Zone valve
X = None
A = 1/2" 24VAC zone valve (09, 12)
B = 3/4" 24VAC zone valve (15-36)
Nomenclature 3