APC UTS6H Specifications download pdf (Page 51)

Table 16-2

Alarms Codes for Combined Heat and Power LED on

freewatt

Control Module

Combined Heat Power

LED Status

Condition

Rapid Flash

(~5 per second)

MCHP operation suspended

on detection of high coolant

temperature

Steady ON Normal MCHP Operation

16.5 MCHP Suspended Mode

MCHP operation will be suspended if there is detection of

high coolant temperature, indicated by rapidly ﬂ ashing

Combined Heat and Power LED. MCHP Suspend Mode

prevents MCHP unit from cycling in overheat situation

in which it cannot run. Condition may be due to boiler

temperature set higher than recommended, improperly

commissioned system, or high aquastat setting on indirect

hot water tank. Perform following tasks if suspend

condition is encountered.

Check boiler parameters• . Hydronic freewatt system

has maximum recommended design water temperature

of 160° F. Suspend mode will occur and effect overall

MCHP runtime and power generation, if boiler water

temperature is higher than 160° F.

Check aquastat on indirect water tank is set no •

higher than 125° F. MCHP may not run while boiler

is satisfying indirect hot water tank, if aquastat must be

set higher for hot water recovery.

Ensure ﬂ ow is presen• t in coolant loop and hydronic

loop (check for working pumps).

Ensure system is properly commissioned• per

Hydronic Commissioning Procedure.

16 - TROUBLESHOOTING

16.6 Control Board LED Interpretation

Observe green LEDs on control board by removing •

cover of

freewatt

Control Module.

Control Board LEDs are valid only in Combined Heat •

and Power Mode (CHP Mode switch “ON”). They are not

used when system is in Bypass Mode (CHP Mode switch

“OFF”).

Do not use Control Board LEDs as indicator of system •

status when in Bypass Mode.

Table 16-3

Controller Board LED’s indicate:

LED ON LED OFF

Z1 Zone 1 circulator ON Zone 1 circulator OFF

Z2 Zone 2 circulator ON Zone 2 circulator OFF

Z3 Zone 3 circulator ON Zone 3 circulator OFF

Z4 Zone 4 circulator ON Zone 4 circulator OFF

Z5 Zone 5 circulator ON Zone 5 circulator OFF

Z6 Zone 6 circulator ON Zone 6 circulator OFF

MCHP ENB MCHP enabled MCHP disabled

X1X2

Relay XX end switch

relay closed

Relay XX end switch

relay open

MyEND

freewatt

Control

Module closed either

DHW or CH input to

boiler, requesting

boiler operation

freewatt

Control

Module not requesting

boiler operation

PUMP1

24 VDC coolant pump

in HI Module energized

24 VDC coolant pump

not energized

PUMP2

120 VAC Hydronic

circulator connected to

HI Module energized

through external relay

switch

120 VAC Hydronic

circulator not

energized

PUMP3 Not used Not used

NOTE: One or more zone circulators may be activated

without speciﬁ c call for heat by room thermostats or DHW

aquastat consequence of control logic anticipating heat de-

mand and attempting to maximize MCHP run time.

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APC UTS6H Specifications Page 51

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