SETUP INSTRUCTIONS
FOR BOTH 2020B-2P AND 1520B-2P
1. The Parallel Unit MUST be piped according to a Leonard
Required Piping Method 5 (see page 4).
2. Make sure full hot and cold supplies to this assembly are
operating. The temperature of the hot water source must be
properly set and maintained.
3. The circulator (if used) must be turned OFF before setup.
4. Turn on enough fixtures for a flow of at least 30 GPM (114
l/min.) downstream from this system. Make sure each fixture
is set to deliver full "HOT" water.
5. Close outlet ball valves V1R,V2R, V1L.
6. Make sure ball valve V2L is in the full open position.
7. Set outlet temperature of the mixing valve LVL to the required
level.
8.
Open ball valve V2R and shut ball valve V2L at the mixing
valve.
9.
Set outlet temperature of the mixing valve LVR to the same
temperature as step 7.
10. Turn off enough fixtures for a flow of at least 2 GPM (7.6
l/min) downstream from this system. Make sure each fixture
is set to deliver full "HOT" water.
11. Open V1L, shut off ball valve V2R
12. Set outlet temperature of mixing valve SVL to the same
temperature as Step 7.
13. Open V1R and shut V1L, set outlet temperature of SVR
mixing valve to the same temperature as STEP 7.
14. Open all outlets. System is operational. To balance
circulation system temperature, see page 5 .
NOTE! FOR OPTIONAL OUTLET SETUP PIPING ARRANGEMENT, SEE PAGE 12
HOT
INLET
COLD
INLET
V2R
V1R
LVR
THERMOMETER
SVR
V2L
V1L
LVL
SVL
10
-10
2
0
0
4
0
14
0
°F
0
60
°C
50
LEONARD
20
40
R
30
1
2
0
1
0
0
60
80
LEONARD
THERMOSTATIC
C
H
ASSE
1017
LEONARD
THERMOSTATIC
C
H
ASSE
1017
4
