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Part number 550-142-054/0411
23
GV90+ gas-fired water boiler — Boiler Manual
Multiple boiler installations
Placing multiple boilers
1. Locate multiple boilers in boiler room according
to:
a. Figure 28 (side-to-side), or
b. Figure 29 (back-to-back).
2. Provide the clearances indicated in the illustrations
listed above to provide for access and servicing. If
these recommended dimensions are not possible,
provide at least the recommended service clearances
given on page 6. Also follow local codes.
3. Construct boiler foundation if boiler room floor
is uneven or if there is a danger of flooding. Size
foundation to allow for clearance and spacing di-
mensions shown in the illustrations at right.
4. Chalkline boiler locations on foundation or boiler
room floor.
5. Uncrate, assemble and mount boilers according to
instructions in this manual.
6. Provide clearance for installation of venting, air
piping, gas piping, expansion tank, primary circula-
tor and other accessories.
Controlling multiple GV90+
boilers
1. Multiple GV90+ boilers can be controlled using any
boiler control/sequencing system that provides an
isolated contact for call for heat (connected to the
boiler's T-T terminals).
Piping multiple GV90+ boilers
1. See suggested piping diagrams in this manual.
Contact Weil-McLain for assistance for systems
not covered.
2. Always pipe the boilers on a secondary loop in a
primary/secondary circuit as shown in the examples
in this manual.
Figure 28 Side-to-side mounting of multiple GV90+ boilers,
showing RECOMMENDED clearances
Figure 29 Back-to-back installation of multiple GV90+ boilers,
showing RECOMMENDED clearances