Duct Installation - Modine Manufacturing MPR Series Installation And Service Manual

UNIT AND DUCT INSTALLATION
Figure 7.1 - Typical Rigging for Model MPR
B-CABINET UNIT - WITHOUT ENERGY RECOVERY
C-CABINET UNIT - ALL
ADJUST CHAIN/STRAP
LENGTH SO UNIT IS
LEVEL WHEN LIFTED
B-CABINET UNIT - WITH ENERGY RECOVERY
ENSURE THE LIFTING
CHAINS/STRAPS CLEAR
THE CASING ON EACH SIDE
D-CABINET UNIT - WITHOUT ENERGY RECOVERY
ADJUST CHAIN/STRAP
LENGTH SO UNIT IS
LEVEL WHEN LIFTED
MIN. 65 v
LIFTING LUG KIT IS SHIPPED LOOSE IN SUPPLY FAN SECTION.
INSTALL (4) LIFTING LUGS PER MCP15-505 USING (4) GRADE 5 BOLTS PER LUG, TORQUED TO 75 ft-lb.
D-CABINET UNIT - WITH ENERGY RECOVERY
ADJUST CHAIN / STRIP
LENGTH SO UNIT IS
LEVEL WHEN LIFTED
12.0'
MINIMUM
EXHAUST HOOD
SUPPLY FAN SECTION
(FIELD INSTALLED)
LIFTING LUG KIT IS SHIPPED LOOSE IN SUPPLY FAN SECTION.
INSTALL (6) LIFTING LUGS PER MCP15-505 USING (4) GRADE 5 BOLTS PER LUG, TORQUED TO 75 ft-lb.
SPREADER BAR
AND LIFTING
CHAINS/STRAPS
BY INSTALLER
(4) 1.50" LIFTING EYE BOLTS
(EACH CORNER OF UNIT)
RAINHOOD
ACCESSORY
(FIELD INSTALL)
SPREADER BAR
AND LIFTING
CHAINS/STRAPS
BY INSTALLER
(6) 1.0" LIFTING LUGS
SPREADER BAR
AND LIFTING
CHAINS/STRAPS
BY INSTALLER
ENSURE THE LIFTING
CHAINS/STRAPS CLEAR
THE CASING ON EACH SIDE
RAINHOOD
ACCESSORY
(FIELD INSTALL)
(4) 1.0" LIFTING LUGS
SPREADER BAR
AND LIFTING
CHAINS/STRAPS
BY INSTALLER
ENSURE THE LIFTING
CHAINS/STRAPS CLEAR
THE CASING ON EACH SIDE
ERM SECTION RAINHOOD
ACCESSORY
(6) 1.0" LIFTING LUGS
(FIELD INSTALL)
to the unit, include a spreader bar as illustrated in Figure
7.1. Avoid twisting or uneven lifting of the unit. The cable
length from the lifting point on the unit to the spreader bar
should always be longer than the distance between the
outer lifting points.
6. Test lift the unit to check for proper rigging balance before
hoisting to the desired installation location.
7. Once lifted to the installation location, orient the hoisted
unit to match the ductwork locations and set evenly on the
curb or stand.
8. Following the instructions in this manual, make final unit
connections to the electric power supply and remote
control circuits. Connect the gas lines to the unit heating
compartment. Seal all utility line clearance holes on the unit
after connections are completed so they are watertight.

Duct Installation

1. The unit is designed to accept 90° flanged ductwork on both
the supply and return air openings. Refer to the roof curb or
the unit base dimensional drawings to determine the location
of the openings.
2. Acoustic duct liners are recommended on all internal supply
and return air ducts.
3. When ductwork is installed prior to unit arrival, flexible
connections should be included to make connections easier
and to simplify possible future service.
4. When a roof curb is used in conjunction with factory supplied
discharge and/or return air connectors, the ductwork can be
fastened to the connectors prior to the unit installation. The
connectors will accept 90° flanged ductwork (see Figure 7.2).
Figure 7.2 - Discharge and/or Return Air Connectors
UNIT BASE
(Shown without
unit for clarity)
90° FLANGED
DUCTWORK
(By Installer)
BEFORE UNIT
INSTALLATION
CAULK ALL MATING
SURFACES ➀
(Caulk by installer)
ROOF
CURB
➀ If roof curb is supplied
by Modine, full perimeter
gasket material is supplied
and caulking is not necessary.
5. To assure proper air flow from the unit, follow these duct
design recommendations:
a. Be sure ducts are properly sized and installed.
b. As a general rule, all discharge ducts should have
a straight run of at least three (3) hydraulic duct
diameters before making turns in the ductwork.
Hydraulic Duct Diameter for Rectangular Ducts = 4A/P
Hydraulic Duct Diameter for Circular Ducts = D where:
A = Cross Sectional Area of Rectangular Duct
P = Perimeter of Rectangular Duct
D = Diameter of Round Cut
c. Wherever turns in the duct work are made, include
turning vanes.
d. Supply air ducts in a "T" configuration should be
avoided to prevent air temperature stratification. If
this configuration must be used, provide appropriate
mixing devices and/or the necessary straight duct
length before the "T" to provide uniformly mixed air
temperature delivery to both supply air duct trunks.
MCP15-500.9
RETURN AIR
CONNECTOR
DISCHARGE AIR
CONNECTOR
7