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INSTALLER'S GUIDE
5A. Checkout - For Units with a Honeywell W7459 Control, Only. See 5B for W7212
Operate the motor through its complete open-close
stroke. If necessary, release one of the previously tight-
ened linkage connections to prevent damage. Check
for proper operation, making sure that the linkage does
not bind and that the motor travels smoothly throughout
its fully open and closed position. Table 1 describes
how to drive the motor to the full open and full closed
positions (power connected). If there is excess length
of linkage rod, cut it to size. Make necessary minor
adjustments until desired operation is obtained, and
tighten all nuts and set screws.
MODEL
DRIVE MOTOR OPEN
M7415
Power to TR and TR1, jumper T and T1
Single enthalpy: The enthalpy change-
over set point is set to return the outdoor
air damper to minimum position when the
enthalpy rises above its set point. The
enthalpy set point scale markings, located
on W7459, are A,B,C,D; see table for the
corresponding control point. The factory-
installed R4 WHITE 620-ohm jumper must
be in place across terminals + and SR.
10
Table 1. Motor Operation Checkout - W7459 Control Only
Disconnect jumper at T or T1 and
CONTROL POINT
CONTROL
APPROX. F (C)
CURVE
AT 50% RH
A
73 (23)
B
70 (21)
C
67 (19)
D
63 (17)
1
Figure 10. Single Enthalpy Changeover Set Point
This motor checkout ensures that:
1. The motor operates the load.
2. The motor responds properly to the controller.
3. There is no binding of the linkage or motor
stalling at any point of travel.
If motor does not operate properly, check for proper
voltage or mechanical binding in linkage or damper.
If questions arise regarding this product, contact
your distributor or representative.
DRIVE MOTOR CLOSED
disconnect P or P1, if connected
60
(16)
55
(13)
B
50
C
(10)
D
45
(7)
40
(4)
35
(2)
35
40
45
50
55
60
(2)
(4)
(7)
(10)
(13)
(16)
APPROXIMATE DRY BULB TEMPERATURE— F ( C)
HIGH LIMIT CURVE FOR W7459D.
SPRING RETURN
Disconnect power at TR and
TR1
85
90
95
(29)
(32)
(35)
80
(27)
75
(24)
70
(21)
65
(18)
A
1
A
B
C
D
65
70
75
80
85
90
95
(18)
(21)
(24)
(27)
(29)
(32)
(35)
100
105
110
(38)
(41)
(43)
100
105
110
(38)
(41)
(43)
M11681
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