UTICA BOILERS MGC-8D Installation, Operation & Maintenance Manual page 8

WARNING
!
Burn and scald hazard. Safety relief valve
could discharge steam or hot water during
operation. Install discharge piping per these
instructions.
Boiler is shipped assembled.
1.
piping from safety relief valve. See Warning, Page
7.
Install temperature pressure gauge.
2.
• Apply pipe sealant to threads on shaft of
gauge.
• Thread gauge into supply water tee. See Figure
3.
NOTICE
DO NOT TIGHTEN GAUGE BY HAND!! Gauge
should be tightened using crescent wrench or
9/16" open end wrench. See Figure 3.
Connect supply and return lines to boiler.
3.
Connections may require additional fi ttings and
parts, as shown on diagrams.
Figure 3 - Temperature Pressure Gauge
6 - CONNECTING SUPPLY AND RETURN PIPING
Install discharge
Verify clean water supply is available to water inlet
valve. Install sand strainer when water supply is from
a well or pump.
Install hot water boiler above radiation level or as
required by Authority having jurisdiction install low
water cutoff device at time of installation. Periodic
inspection is necessary, as is fl ushing of fl oat type
devices, per manufacturers specifi c instruction.
FOR USE WITH COOLING UNITS
A. Boiler used in connection with refrigeration
system, must be installed so that chilled medium
is piped in parallel with heating boiler. Appropriate
valves must be used to prevent chilled medium
from entering heating boiler. See Figure 5 page 9.
B. Boiler connected to heating coils located in air
handling units where they may be exposed to
refrigerated air circulation, piping system shall
be equipped with fl ow control valves or other
automatic means to prevent gravity circulation of
boiler water during cooling cycle.
LOW WATER TEMPERATURE AND LARGE WATER
CONTENT SYSTEM (See Figures 6 and 7, Page 10.)
Signifi cant condensation may form in boiler and/or
venting system if boiler is operated for long period of
time with return temperatures of less than 120° F.
Condensate is corrosive and can cause severe
damage to boiler and venting system. Minimum
design return water temperature to prevent
condensation in boiler and venting is 120°F.
Minimum high limit setting is 140°F.
Boiler used in heating system where design
1.
water temperatures below 140°F are desired
(e.g. radiant fl oor heating), 4-way mixing valve
or suitable alternative is required to prevent
low temperature low return water from entering
boiler. Follow mixing valve manufacturer's
instructions.
Boiler connected to system having large water
2.
content (such as former gravity system), install
system bypass. See Figures 7 and 8, page 10.
Boiler water reset control is used to operate
3.
boiler, minimum reset supply water temperature
setpoint must be at least 140°F, unless mixing
valve is used as in (1) above.
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