LAARS Mighty Therm2 MT2P (Sizes 500–2000 MBTU/h) - Install and Operating Manual - Manual (Page 11)

MT2P Pool Heater Page 11
Commercial Kit from the manufacturer.
Part numbers for the low profile terminals to cover
the vent and combustion air openings are shown in
Table 6.
SECTION 3.
Gas Supply and Piping
3.1 Gas Supply and Piping
Gas piping should be supported by suitable
hangers or floor stands, not by the appliance.
The MT2P’s gas train allows the user to pipe the
gas from either the right side or the left side of the unit.
As shipped, the left side of the gas train is capped off,
and there is a manual valve on the right side. If desired,
the manual valve may be switched with the cap on the
opposite side to accommodate alternate installations.
Review the following instructions before
proceeding with the installation.
1. Verify that the appliance is fitted for the proper
type of gas by checking the rating plate. Laars
Heating Systems appliances are normally
equipped to operate at elevations up to 2000 feet
(610m). MT2P appliances may be adjusted to
operate properly at higher elevations; however,
input will be reduced if the heating value of the
gas supply is below sea level values.
2. The maximum inlet gas pressure must not exceed
13" W.C (3.2kPa). The minimum inlet gas
pressure is 5" W.C. (1.2kPa).
3. Refer to Table 7 , size supply.
4. Run gas supply line in accordance with all
applicable codes.
5. Locate and install manual shutoff valves in
accordance with state and local requirements.
6. A sediment trap must be provided upstream of the
gas controls.
7. All threaded joints should be coated with
piping compound resistant to action of liquefied
petroleum gas.
8. The appliance and its individual shutoff valve
must be disconnected from the gas supply piping
during any pressure testing of that system at test
pressures in excess of 1/2 PSIG (3.45kpa).
9. The unit must be isolated from the gas supply
system by closing its individual manual shutoff
valve during any pressure testing of the gas supply
piping system at test pressures equal to or less
than 1/2 PSIG (3.45kpa).
10. The appliance and its gas connection must be leak
tested before placing it in operation.
11. Purge all air from gas lines.
Caution
Do not use open flame to check for leaks.
NOTE: The MT2P appliance and all other gas
appliances sharing the gas supply line must be firing at
maximum capacity to properly measure the inlet supply
pressure. The pressure can be measured at the supply
pressure port on the gas valve. Low gas pressure
could be an indication of an undersized gas meter,
Figure 5. Pool Heater Piping.
The MT2P Pool Heater is shipped with a field-installed mixing system, and must be piped in prima-
ry-secondary style, as shown. A remote pool temperature sensor and remote pool temperature high
limit are wired to the MT2P, to be mounted in the pool water loop, as shown.