Table of Contents
Advertisement
4. Installation
4.6.2 Connection of the heating circuit
The boiler is supplied with the following NPT type
threaded components which include:
1¼"x 1¼"x ½" NPT black iron malleable TEE fitting
1¼"x 1¼"x ¾" NPT black iron malleable TEE fitting
1¼" NPT x 4 inch long black iron nipple
1¼" NPT x 1 inch close black iron nipple
¾" NPT black iron 90° street elbow
Watts PRV, 30 psig, model M3351M1 or Conbraco
Watts 2½" Temp. Pressure gauge, ½" DPTG3-2.5
⅜" by 3 inch long lag bolts
⅜" x 1 ¾" inches long lag shield
⅜" flat washer
1¼" Brass union
¾" NPT black iron malleable tee fitting
Note:
All components must be installed onto the boiler
BEFORE the boiler is to be installed onto the wall
bracket.
Installation procedure for water connection kit
Step 1
Remove the anti-dust plugs supplied with
boilers, some water may come out of the boiler
(from factory testing of boiler)
Step 2
Lay the boiler on its side and use cardboard
under the boiler to prevent scratching of the
boiler casing surface
Step 3
Remove all fittings from the components box
supplied, and add pipe dope to all male threads,
including the 1
threads on the boiler
Step 4
Use a chain pipe wrench on the 1
side and install male side of the 1
union. Be careful not to apply torque onto
the 1
NPT brass union without a chain pipe
¼
"
wrench on the 1
cause the boiler casing to distort.
Step 5
Using a pipe vise, attach the female side of the
brass union to one end of the 1
pipe nipple, and attach the 1
tee to opposite end of 1
Step 6
Install a close nipple onto the 1
inch NPT tee to bottom of the assembly
Step 7
Install
" street elbows in
¾
the assembly, ensure the street elbow is facing
upwards.
Step 8
Install supplied
Model M3351 in street elbow. Ensure the
pressure relief valve is facing outwards
MCA-Pro ISM Rv.4.1 2/2017
NPT inlet and 1
NPT outlet
¼
¼
"
"
NPT outlet
¼
"
NPT brass
¼
"
NPT outlet pipe as this could
¼"
NPT x 6" long
¼
"
X 1
" X
¼
¼
"
NPT nipple
1/4"
x 2" x
¼
"
" inch portion of
¾
" brass pressure relief valve
¾
1
1
1
1
2
1
1
2
2
1 1/4x1 1/4x3/4NPT
Tee Fitting
2
1
1
1 1/4 Niple,4"long
1/2NPT Temp/Pressure
Gauge Model DPTG
NEVER INSTALL A PRESSURE RELIEF VALVE THAT IS
RATED HIGHER THAN 56 PSIG / 3.9 BAR, as severe
personnel injury or death can occur.
Step 9
Install the remaining ¾" street elbow into the
outlet port of the pressure relief valve, ensure
this
Step 10 Install the supplied temperature and pressure
" NPT
¾
gauge in the ½" NPT port of the bottom 1
x 1
"
½
Step 11 Install the pipe assembly onto the boiler by
tightening the brass 1¼" NPT union
Step 12 Install the siphon container onto the boiler
Now the boiler is ready to be installed onto the wall
bracket, please ensure two people handle the boiler
and carefully place the assembled boiler onto the wall
bracket.
After the boiler is installed onto the wall bracket, use a
water level to ensure the boiler is level in all planes.
MCA Pro 45/65/90/115
1 1/4x1 1/4x1/2NPT
3/4x 3 Tee
Tee Fitting
Fitting GAS
3/4NPT Black
1 1/4 Close Nipple
Iron Street Elbow
3/8x3"L Lag Bolt
DANGER
NPT street elbow is facing downwards
¾"
X½" NPT tee fitting
¾
"
Brass 1 1/4
Union
PRV,30PSI,
M3351
5/8 diameter x 1 3/4"L lags
"
¼
29
Advertisement
Table of Contents
