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60
Fig. 67 — EconoMi$er
®
IV Wiring
Step 12 — Adjust Factory-Installed Options
ECONOMI$ER IV OCCUPANCY SWITCH
Refer to Fig. 67 for general EconoMi$er IV wiring. External occu-
pancy control is managed through a connection on the Controls
Connections Board.
If external occupancy control is desired, connect a time clock or
remotely controlled switch (closed for Occupied, open for Unoc-
cupied sequence) at terminals marked OCCUPANCY on CTB.
Remove or cut jumper JMP 2 to complete the installation.
Step 13 — Install Accessories
Available accessories include:
• Roof curb
• Thru-base connection kit (must be installed before unit is
set on curb)
• LP conversion kit
• Manual outside air damper
• High altitude gas kit
• Flue discharge deflector
• Low ambient controls
• Thermostat/sensor
• Two-position motorized outside air damper
• EconoMi$er2 (without control/for external signal and inte-
grated barometric relief)
• EconoMi$er IV (with control and integrated barometric
relief)
• Power exhaust
• Differential dry-bulb sensor (EconoMi$er IV)
• Outdoor enthalpy sensor
• Differential enthalpy sensor
• CO
2
sensor
• DDC interface (PremierLink)
• Louvered hail guard
• Phase monitor control
• Winter start kit
Refer to separate installation instructions for information on in-
stalling these accessories.
Step 14 — Check Belt Tension
Measure the belt span length as shown in Fig. 68. Calculate the re-
quired deflection by multiplying the belt span length by
1
/
64
. For
example, if the belt span length is 32 inches:
32 x
1
/
64
=
1
/
2
inch deflection.
BELT FORCE — DEFLECTION METHOD
Check the belt tension with a spring-force belt force deflection
gage (available from drive belt manufacturer).
1. Place a straightedge along the belt between the two pulleys.
Measure the distance between the motor shaft and the blower
shaft.
2. Set the tension gage to the desired tension (see Table 1 in
Fig. 68). Place the large O-ring at that point.
3. Press the tension checker downward on the belt until the large
O-ring is at the bottom of the straightedge.
4. Adjust the belt tension as needed.
Adjust belt tension by loosing the motor mounting plate front bolts
and rear bolt (see Fig. 69) and slide the plate towards the fan (to
reduce tension) or away from the fan (to increase tension). Ensure
the blower shaft and motor shaft are parallel to each other (pulleys
aligned). Tighten all bolts securely when finished.
BELT TENSION METHOD
Requires belt tension gage that measures tension in belt in units of
lbs force (see Fig. 68).
ECONOMIZER
2 POSITION DAMPER
UNIT WITHOUT ECONOMIZER OR
2 POSITION DAMPER
Summary of Contents for 48TC D/E17 Series
Page 5: ...5 Fig 2 48TC 17 20 Vertical Airflow...
Page 6: ...6 Fig 3 48TC 17 20 Back View and Condensate Drain Location...
Page 7: ...7 Fig 4 48TC 17 20 Corner Weights and Clearances...
Page 8: ...8 Fig 5 48TC 17 20 Bottom View...
Page 9: ...9 Fig 6 48TC 24 28 Vertical Airflow...
Page 10: ...10 Fig 7 48TC 24 28 Back View and Condensate Drain Location...
Page 11: ...11 Fig 8 48TC 24 28 Corner Weights and Clearances...
Page 12: ...12 Fig 9 48TC 24 28 Bottom View...
Page 13: ...13 Fig 10 48TC 30 Vertical Airflow...
Page 14: ...14 Fig 11 48TC 30 Back View and Condensate Drain Location...
Page 15: ...15 Fig 12 48TC 30 Corner Weights and Clearances...
Page 16: ...16 Fig 13 48TC 30 Bottom View...
Page 19: ...19 Fig 16 Roof Curb Details 17 and 20 Size Units...
Page 20: ...20 Fig 17 Roof Curb Details 24 and 28 Size Units...
Page 21: ...21 Fig 18 Roof Curb Details 30 Size Units...
Page 47: ...47 Fig 52 PremierLink Wiring Diagram...
Page 48: ...48 Fig 53 PremierLink Wiring Diagram with Humidi MiZer System...
Page 49: ...49 Fig 54 Typical RTU Open System Control Wiring Diagram...
Page 50: ...50 Fig 55 Typical RTU Open System Control Wiring Diagram with Humidi MiZer System...
Page 51: ...51 Fig 56 48TC 17 30 Control Wiring Diagram...
Page 52: ...52 Fig 57 48TC 17 30 Power Wiring Diagram 208 230 3 60...
Page 53: ...53 Fig 58 48TC 17 30 Power Wiring Diagram 460 3 60...
Page 54: ...54 Fig 59 48TC 17 30 Power Wiring Diagram 575 3 60...
Page 55: ...55 Fig 60 48TC 17 30 Control Wiring Diagram with Humidi MiZer System...
Page 56: ...56 Fig 61 48TC 17 30 Power Wiring Diagram with Humidi MiZer System 208 230 3 60...
Page 57: ...57 Fig 62 48TC 17 30 Power Wiring Diagram with Humidi MiZer System 460 3 60...
Page 58: ...58 Fig 63 48TC 17 30 Power Wiring Diagram with Humidi MiZer System 575 3 60...