Table of Contents
Advertisement
Cd31 Stagger Start Offset
Time (Seconds)
Cd32 Current Limit
(Amperes)
Perishable Mode
Dehumidification/Hu-
Cd33
midification Control
(% RH)
Cd34 Economy Mode
(On--Off)
Cd35 Bulb Mode
Cd36 Evaporator Speed
Select
Defrost Termination
Cd37
Temperature Setting
(Bulb Mode)
T-296
Downloaded from
ManualsNet.com
Table 3-5 Controller Function Codes (Sheet 3 of 4)
The stagger start offset time is the amount of time that the unit will delay at start-
up, thus allowing multiple units to stagger their control initiation when all units are
powered up together. The eight possible offset values are:
0 (Factory Default), 3, 6, 9, 12, 15, 18 or 21 seconds
The current limit is the maximum current draw allowed on any phase at any time.
Limiting the unit's current reduces the load on the main power supply. This is ac-
complished by reducing the SMV position until current draw is reduced to the set
point. When desirable, the limit can be lowered. Note, however, that capacity is
also reduced. The five values for 460vac operation are:
15, 17, 19, 21 (Factory Default), 23
Relative humidity set point is available only on units configured for dehumidifica-
tion. When the mode is activated, the control probe LED flashes on and off every
second to alert the user. If not configured, the mode is permanently deactivated
and "-- -- -- -- -- " will display. The value can be set to "OFF." "TEST," or a range of
65 to 95% relative humidity in increments of 1%. [If bulb mode is active (code
Cd35) and "Lo" speed evaporator motors are selected (code Cd36) then set point
ranges from 60 to 95%.] When "TEST" is selected or test set point is entered, the
heat LED should illuminate, indicating that dehumidification mode is activated.
After a period of five minutes in the "TEST" mode has elapsed, the previously
selected mode is reinstated.
If humidification (CnF35) is enabled, then humidification will be enabled and
dehumidification locked out at set points of 75% and above. At set points be-
low 75%, dehumidification will be enabled and humidification locked out.
Economy mode is a user selectable mode of operation provided for power saving
purposes.
Bulb mode is a user selectable mode of operation that is an extension of dehu-
midification control (Cd33). If dehumidification is set to "Off," code Cd35 will dis-
play "Nor" and the user will be unable to change it. After a dehumidification set
point has been selected and entered for code Cd33, the user may then change
code Cd35 to "bulb." After bulb has been selected and entered, the user may then
utilize function codes Cd36 and Cd37 to make the desired changes.
This code is enabled only if in the dehumidification mode (code Cd33) and bulb
mode (Cd35) has been set to "bulb". If these conditions are not met, "alt" will be
displayed (indicating that the evaporator fans will alternate their speed) and the
display cannot be changed. If a dehumidification set point has been selected
along with bulb mode then "alt" may be selected for alternating speed, "Lo" for low
speed evaporator fan only, or "Hi" for high speed evaporator fan only. If a setting
other than "alt" has been selected and bulb mode is deactivated in any manner,
then selection reverts back to "alt."
This code, as with function code Cd36, is used in conjunction with bulb mode and
dehumidification. If bulb mode is active, this code allows the user to change the
defrost termination thermostat settings. If bulb mode is deactivated, the DTS set-
ting returns to the default.
search engine
NOTE
3-16
Advertisement
Table of Contents
