American Standard UV05 User's Manual | Page 14

American Standard Air Conditioners User's Manual - UV05.
Download
Page  of 50
4.5, 2240 votes
background image

14

McQuay OM 751

Description of Operation

Table 8: UVC state names and numbers

OFF Mode (State 9)

Off mode is provided so that the UVC can be forced into a powered OFF condition. OFF mode 
is a “stop” state for the unit ventilator; it is not a power off state. OFF mode consists of a 
single UVC state: OFF [9].

When OFF mode becomes active, the UVC stops all normal heating, cooling, and ventilation 
(OA damper is closed), and fan operation ends. The UVC continues to monitor space 
conditions, indicate faults, and provide network communications (if connected to a network) 
in the OFF mode while power is maintained to the unit.

While in OFF mode, the UVC does not maintain DA temperatures. If the space temperature 
drops below EHS while in the OFF mode, the UVC is forced into the Emergency Heat mode 
(see “Emergency Heat Mode (Super State)” on page 16).

The space lighting output continues to operate based upon the current occupancy mode.
Note – Special purpose unit modes such as Purge, Pressurize, and De-pressurize can force the 

UVC to perform “special” functions during which the display appears to be in the OFF 
mode.

Figure 7: Off state diagram

Normal UVC modes

State names

State numbers

Decimal

ASCII

Hex

OFF

OFF

9

9

57

Night purge

Night Purge

8

8

56

Fan only

Fan Only

10

A

65

Emergency heat

Full Heat

7

7

55

Cant Heat

13

D

68

Auto

Heat

Heat

5

5

53

Cant Heat

11

B

66

Low Limit

14

E

69

Cool

 EconMech

1

1

49

Mech

2

2

50

Econ

3

3

51

DA Heat

4

4

52

Cant Cool

12

C

67

Low Limit

15

F

70

WARNING

Off mode is a “stop” state for the unit ventilator. It is not a “power 
off” state. Power may still be provided to the unit.

OFF

9

UVC Mode 

≠ OFF

UVC Mode 

= OFF

Transition 

point

Related Manuals for American Standard UV05

0.557678s