LAARS Mini-Therm II JVT (Sizes 50-225) - Install and Operating Manual - Manual (Page 5)

Mini-Therm II Hydronic Boiler Page 5
2.2 Field Assembly
1. Mini-Therm II boilers have built-in draft diverter
for natural draft operation.
2. Find the vent damper box which is located in the
boiler package.
3. Install the vent damper directly to the top of the
draft diverter outlet with the damper operator
facing to the front of the boiler, and with the
flow direction arrow pointing upward. Use the
vent damper wire harness provided with the
boiler to connect the vent damper to the boiler.
The bracket end of the harness should be
connected to the vent damper actuator.
4. For Model JVS only: Install the metal plug
provided with the vent damper onto the damper
plate hole. Disregard the metal plug in case of
standing (continuous) pilot boilers. For all JVT
models, the damper plate hole should never be
blocked.
5. Do not modify the automatic vent damper
device. It is very important that no other vents
are closed. Provide at least six inches clearance
between the automatic vent damper and
combustible construction, and be sure to allow
access for servicing the damper.
6. Install the temperature/pressure gauge provided
in the parts box.
Figure 1. Dimensional Information.
Vent Damper
optional in Canada
Front
View
Top
View
Left
Side
View
B D
V
E
9-1/4
24
7
18
17-3/4 451
Vent Damper
Harness
1-1/4 NPT
Draft
Diverter A/2
C
A
In Return
T&P Gauge
Out Supply
PRV
Dimensions in inches cm
Dimensions Water Gas
inches cm Conn. Conn.
Size* A B C D E V in. in.
50 13-3/8 34 27-3/4 71 23-5/8 60 21-3/4 55 26-1/2 67 4 10 1-1/4 1/2
75 13-3/8 34 27-3/4 71 24-1/8 61 21-3/4 55 27-1/2 70 5 13 1-1/4 1/2
100 16-7/8 43 28-3/4 73 24-1/8 61 22-3/4 58 27-1/2 70 5 13 1-1/4 1/2
125 16-7/8 43 28-3/4 73 23-5/8 60 22-3/4 58 27-1/2 70 6 15 1-1/4 1/2
160 20-3/8 52 28-3/4 73 23-5/8 60 22-3/4 58 27-1/2 70 6 15 1-1/4 1/2
225 25-5/8 65 31-1/2 80 23-1/4 59 23-3/4 63 27-1/2 70 7 18 1-1/4 * 3/4**
* Values shown are for both JVS and JVT Models **1/2 for propane
Figure 2. Field Assembly Items.
Vent
Damper
Harness
Vent
Damper
Draft
Diverter
(built-in)
Temp
Press
Gauge