External Motor Installation - Belt Drive - EVAPCO ATC-E Rigging And Assembly Instructions

ATC-E, ATC-ES, ATWB, eco-ATWB and eco-ATWB-E Evaporative Condensers and Closed Circuit Coolers
External Motor Installation – Belt Drive
All units narrower than 10' (3m) wide have their motors installed outside the unit in a shaft up configuration as shown in figures 18a
and 18b below. Due to shipping width restrictions, these motors cannot ship mounted on the units since they would extend past the
width of the truck. For this reason, the motor(s), motor base(s), motor guard(s), "J" bolts, pivot pins and belt(s) are shipped in the
cold-water basin of the cooling tower. Please follow the step-by-step instructions below to properly install these components.
G
A
J
B
Figure 18a - External Motor Installation
C
1. Study Figure 18a above before installing the motor base on the unit.
2. Insert the lifting device into the slots A located on the top of the motor base.
3. Lift the motor base B and insert the pivot pin C down into hole E and pivot pin F into hole D.
4. Install washer and nut (do not overtighten) on pivot pins. Install jam nut on pivot pin C.
5. Insert "J" bolts G into holes H. Install flat washers and cotter pins. Place nuts and washers on threaded portion of "J" bolts.
These will be behind the motor base installed in the next step.
6. Install "J" bolts G into holes J in the motor base. Install flat washers, lock washer and nuts. Remove lifting device from the
motor base. Position motor base towards top section of unit for belt installation.
7. Install Power-Band belt K (Figure 18b) around fan
sheave and motor sheave. Tighten belt by adjusting
nuts on "J" bolts. Do not overtighten the belts. The
center of the belt should deflect approximately 3/4"
(19mm) in the horizontal plane with moderate hand
pressure.
8. Measure to see that the top and bottom of the
motor base are the same distance out from the
casing of the unit. This will ensure that the sheaves
are properly aligned since the driven sheave on the
fan shaft comes pre-set from the factory.
9. As a final check, lay a straight edge from sheave to
sheave as shown below in Figure 19. There should
be four-point contact. Adjust the position of the
motor sheave as necessary until four-point contact
is achieved.
10. To install motor guard L, match up hinges and install hinge pins M as shown in Figure 18b.
11. Close motor guard L and install wing bolts M.
Note: For European market, additional belt cover plate needs to be installed.
H
F
E
G
D
16
K
N
Figure 18b - Motor Guard and Power-Band
Belt Installation
1 2
ADJUST POSITION
OF MOTOR SHEAVE
FAN SHEAVE
(only if necessary)
Figure 19 - Sheave Alignment Check
L
3 4
M