Demand Duo
™
H
-
Series Installation and Operation Manual
40
A
Hot Water Outlet
*
B
Hot Water Outlet Valve
*
C
Cold and Hot Unions
*
D
Temperature
-
Pressure Relief
Valve
E
Operation Unit / Temperature
Control
F
Temperature
-
Pressure Relief
Valve Discharge Pipe
(do not cap, plug, or reduce)
*
G
Pressure Relief Valve Discharge
Pipe (do not cap, plug, or re-
*
H
Condensate Discharge Pipe
(Must include air gap)
*
I
Drain Pan
*
J
Vent pipe (PVC Room Air shown
for illustration purposes, see
venting section for other options)
*
K
Gas Control Valve
*
L
Gas Union
*
M
Drip Leg (Sediment Trap)
*
N
Cold Water Supply Valve
*
O
Cold Water Supply
*
P
Thermal Expansion Tank
*
Q
Non
-
Tempered Supply Line
*
R
Thermostatic Mixing Valve
*
S
Purge Line
*
T
Check Valve
*
*
Field Supplied
Mixing Valve Installation
Hot Water
Supply
A
B
C
D
O
N
P
J
E
I
F
M
L
K
R
Q
S
G
H
D
Figure 41
Figure 42
Cold Water Supply
T
