LAARS Mighty Therm HH-PH (Sizes 175-400) - Installation, Operation and Maintenance Instructions - Manual (Page 4)

LAARS HEATING SYSTEMS Page 4
HOT HOT
SECTION 2.
Installation Instructions
2A. General Information
WARNING
Follow local regulations with respect to installation
of carbon monoxide (CO) detectors and
manufacturer's maintenance schedule of the boiler.
Install the HH-PH boilers in accordance with the
procedures in this manual (or the Laars warranty may
be voided), local codes and ordinances. In the absence
of such codes, install the boilers in accordance with
the latest edition of the National Fuel Gas Code, ANSI
Z223.1. In Canada, the installation must be in
accordance with CAN1-B149.1 or .2 and local codes.
The authority having jurisdiction may require the
installation conform to the Standard for Controls and
Safety Devices for Automatically Fired Boilers,
ANSI/ASME CSD-1. Any changes to the boiler, gas
controls, gas orifices, wiring or draft hood may void
the warranty. If field conditions require change,
consult the factory.
All gas-fired products require correct installation
to assure safe operation. The requirements for boilers
include the following:
1.
Field assembly of draft hood and vent cap
(if required – see Section 2B)
2. Appropriate site location (clearances) and
flooring
3. Sufficient combustion and ventilation air
4. Adequate venting of combustion products
5. Adequate water flow
6. Properly sized gas meter and piping
7. Proper electrical wiring
This manual provides the information needed to
meet these requirements. Review all application and
installation procedures completely before continuing
the installation.
2B. Field Assembly
The HH-PH boiler is shipped from the factory
with the top assembly in the low-profile configuration
for outdoor installations.
The HH-PH boiler is design certified for indoor
installation when equipped with a drafthood, which
must be installed without modification. Check the
rating plate on the boiler for the correct Laars part
number.
Follow this procedure to make the conversion:
a. Remove the top filler plate, stamped “HOT,” by
slipping a fine-blade screw driver into the slot at
the rear of the plate and gently prying it up (see
Figure 2).
b. Remove the two screws attaching the adapter
plate to the top assembly and lift it out (see
Figure 3).
c. Remove the vent cap or drafthood from its
package.
d. Disengage the flue transition ring from the stack
extension and place it on top of the collector
assembly as shown in Figure 4.
Figure 2. Top Filler Plate. Figure 3. Adapter Plate.
Figure 5. Vent Cap with
Adapter Plate
Figure 4. Flue Transition
Ring.
e. Slide the adapter plate over the bottom of the
stack extension as shown in Figure 5. Fit the
stack extension down over the flue transition
ring. Seat the adapter plate on the top assembly
and secure it with two screws (see Figure 6).
f. Find the vent damper box which is located in the
boiler package (boiler models 175 to 250 only)
(see Figure 8).
g. Install the vent damper directly to the top of the
draft hood outlet. The damper operator should
face to the front of the boiler, and the flow
direction arrow should point upward. Use the
vent damper wire harness to connect the vent
damper to the boiler. The bracket end of the
harness should be connected to the vent damper
actuator.