31
Table 6 — Unit Ventilator Airflow — ECM Airflow
LEGEND NOTES:
1. Factory default is Low Position.
2. Med, High, and Max positions are field settings.
Step 6 — Make Final Preparations
1. Turn power off (lock out and tag electrical disconnect).
2. Install thermostats and perform any other final wiring as
applicable.
3. Clean dirt, dust, and other construction debris from unit
interior. Be sure to check fan wheel and housing.
4. Rotate fan wheel by hand to be sure it is free and does
not rub on housing.
5. Be sure drain line is clear and is properly and securely
positioned. Pour water into drain to check operation.
6. Vent all air from unit coil and related piping. The coil is
provided with a Schrader or screw-type manual air vent
on the return manifold to release air from the coil.
NOTE: This vent is not adequate for removing air from the
building piping system. Customer must provide for venting of
the piping system.
a. Pressurize the building piping system with water.
Vent trapped air at system vents.
b. Schrader type vent: Remove cap. Depress valve at
coil vent until air is expelled from the unit. Release
valve. Re-install cap.
c. Screw type vent: Back out manual setscrew until air
is expelled. Re-tighten setscrew.
d. Automatic type vent: Trapped air will be vented
automatically. Vent releases air slowly, usually drip-
ping water into the drain pan in the process.
Make sure all service valves are open and that motorized control
valves, if supplied, are set for automatic operation.
7. Check all control valves in the system for proper opera-
tion in accordance with valve manufacturer’s instruc-
tions.
8. Install filter in frame at front of coil. If field-supplied
filters are used, be sure size is correct. See Table 1 for
filter data.
9. Ensure all panels and filters are installed before checking
fan operation. Turn on unit power. Check fan and motor
operation.
.
START-UP
Start-up procedures vary depending on time of year (summer or
winter) and building characteristics (new building/old building,
occupied/unoccupied, etc.). All building windows and door
should be closed before starting the unit. Close the unit’s outdoor
air dampers. Bathroom and kitchen exhaust fans should be off.
Start-up in the cooling mode requires proper care to avoid con-
densation problems. Condensation forms on surfaces that are
colder than the dew point of the surrounding air. If a unit is start-
ed and is piped with low-temperature chilled water in a hot, hu-
mid atmosphere, condensation will form on many parts of the
unit. In order to avoid excessive condensation, higher tempera-
ture water should initially be used (approximately 65°F to 70°F),
reduce the chilled water flow rate (GPM) and set the fan to high
speed for maximum airflow.
As the building temperature drops, the chilled water temperature
can be gradually reduced until it reaches 50°F. At this point the
outside-air damper can be opened to take in minimum outside
air. When the chilled water temperature is reduced to its design
point, the exhaust fans can be turned on.
Maximum entering water temperature is 180°F, unless name-
plate indicates 200°F.
UNIT SIZE
MOTOR
HP
COIL TYPE
APPROXIMATE AIR DELIVERY (Cfm)
ESP Speed Board Position
Low Position
(0.0 in. wg)
Med Position
(0.10 in. wg)
High Position
(0.25 in. wg)
Max Position
(0.45 in. wg)
Max High Low Max High Low Max High Low Max High Low
40UV050
1
/
3
CW 499 336 248 — — — — — — — — —
3-4EH/DX 499 419 336 — — — — — — — — —
5-6EH 491 380 324 — — — — — — — — —
40UV,UH075
1
/
3
CW 747 484 346 753 548 432 752 530 427 751 541 386
3-4EH/DX 747 644 498 753 609 472 752 612 470 751 618 498
5-6EH 755 645 583 746 598 539 755 585 554 765 610 542
40UV,UH100
1
/
3
CW 997 703 505 987 693 543 1012 663 483 994 692 480
3-4EH/DX 997 853 615 987 850 639 1012 823 626 994 819 618
5-6EH 1016 819 719 1002 851 709 1024 798 787 1024 820 734
40UV,UH125
1
/
2
CW 1266 880 657 1239 905 609 1235 898 676 1231 898 627
3-4EH/DX 1266 1023 769 1239 1055 758 1235 1037 765 1231 1010 778
5-6EH 1259 1049 897 1239 995 888 1226 995 888 1253 994 919
40UV,UH150
1
/
2
CW 1503 1033 775 1479 1046 712 1494 1020 770 1486 1075 737
3-4EH/DX 1503 1246 956 1479 1216 965 1494 1209 927 1486 1222 917
5-6EH 1517 1222 1068 1490 1206 1087 1498 1159 1120 1503 1188 1074
40UH200
3
/
4
ALL 2014 1384 1023 1981 1386 971 1965 1385 997 1814 1354 993
3-4EH/DX — Direct Expansion Coil Applications with 3 to
4 Elements of Electric Heat
5-6EH — 5 to 6 Elements of Electric Heat
CW — Chilled Water Applications
ECM — Electronically Commutated Motor
ESP — External Static Pressure
IMPORTANT: Do not start up or operate unit without
filter and panels installed. Be sure filter and unit interior
are clean.
CAUTION
If unit is marked for 200°F maximum entering water tem-
perature, customer must ensure that water vaporization
does not occur, especially at higher elevations when enter-
ing water temperatures are greater than 190°F.
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