Honeywell EXCEL 10 Installation Instructions Manual page 3

Fan coil unit controllers

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EXCEL 10 W7754K,P,Q,R,S,T,V FCU CONTROLLERS − INSTALLATION INSTRUCTIONS

Table 2. W7754 Controller: Overview of terminals and functions (by model)

term.

1+2

Removable plug; receiving/sending data on the L

BINARY INPUT (DI1), configurable (via the LNS plug-in) to read input from, e.g., a hardwired

window contact, occupancy sensor, etc.; suitable for dry contacts, only; max. voltage at open

contact = 5 Vdc

ANALOG INPUT (AI3), permanently configured to read input from a hardwired wall module's

temperature setpoint adjustment knob; enabled / disabled using the left DIP switch

ANALOG INPUT (AI2), permanently configured to read input from a hardwired wall module's

room temperature sensor (use NTC20k sensor, only; accuracy [w/o sensor] = 0.5 °C at 25 °C);

enabled / disabled using the left DIP switch

GND serving terminals 4, 5, 9, 10, and 11 (I/Os for wall module)

GND serving terminal 12 (AO1)

GND serving terminal 3 (DI1)

BINARY OUTPUT (LED), permanently configured to write output to switch the LED of a hard-

wired wall module ON/OFF; enabled / disabled using the left DIP switch; max. voltage = 5 Vdc;

max. current = 5 mA

ANALOG INPUT (AI1), permanently configured to read input on whether a hardwired wall

module's 3-speed fan control knob has been set to AUTO, OFF, LOW, MEDIUM, or HIGH and

whether its "occupancy override" button has been pressed; enabled / disabled using the left DIP

switch

BINARY INPUT (DI2), permanently configured to read input on condition (open/closed) of

window contact; enabled / disabled using the right DIP switch; suitable for dry contacts, only;

max. voltage at open contact = 5 Vdc

ANALOG OUTPUT (AO1), used (depending upon configuration via the LNS plug-in) to control a

variable speed fan or to control a proportional valve

A normally-open relay (Rel4), permanently configured to write output to switch a hardwired

13+14

electrical reheat coil ON/OFF; switching voltage = 24...230 Vac; switching current = 0.05...10 A

A common terminal for terminals 16, 17, and 18

A normally-open relay (Rel3), permanently configured to write output to a hardwired three-speed

(3)

fan, setting it to HIGH

A normally-open relay (Rel2), permanently configured to write output to a hardwired three-speed

(3)

fan, setting it to MEDIUM

A normally-open relay (Rel1), permanently configured to write output to a hardwired three-speed

(3)

fan, setting it to LOW

(4)(7)

Triac output (Triac1), perm. configured to write output to OUT1 & close hardwired valve

(4)(7)

Triac output (Triac2), perm. configured to write output to OUT1 & open hardwired valve

(4)(7)

Triac output (Triac3), perm. configured to write output to OUT2 & close hardwired valve

(4)(7)

Triac output (Triac4), perm. configured to write output to OUT2 & open hardwired valve

24 VAC common terminal for terminals 19 & 20; internally connected to terminal 24;

(3)(7)

W7754T4431, only: internally connected also to terminal 27

24 VAC common terminal for terminals 19 & 20; internally connected to terminal 23;

(3)(7)

W7754T4431, only: internally connected also to terminal 27

The "N" (25) & "L" (26) power supply terminals (removable plug); W7754Q: 24 VAC (20%),

25+26

50/60 Hz; W7754K,P,R,S,T,V: 230 VAC (-15%/+10%), 50/60 Hz

(7)

24 VAC / 200 mA auxiliary voltage; internally connected to terminals 23 & 24

(7)

A common terminal for terminal 27; internally connected to terminals 6, 7, & 8

(1)

The W7754K features an extra socket (2-pin connector located to the left of the terminal blocks) containing an output suitable for attachment to a solid-state relay

(use only Carlo Gavazzi RS1A23D25-P64; max. voltage = 12 VDC; max. current = 12 mA at 10 VDC) for low-voltage PWM control in high-current electrical reheat

applications. To enable it, term. 19 and 20 must be configured (via LNS plug-in) for "Heat" -> "PWM".

(2)

For AO1 (terminal 12) to be used to control a proportional valve, OUT1 (term. 19 and 20) must be configured (via LNS plug-in) for "PWM", and the fan must not

be configured for "variable speed fan".

(3)

If all three relays (term. 16, 17, and 18) are switched OFF, the 3-speed fan will likewise be switched OFF. Switching voltage = 24...230 VAC; switching current =

0.05...3 A (max. 3 A for all three relays together).

(4)

Switching voltage = 230 VAC (W7754K,P,R,S,V) or 24 VAC (W7754Q,T), max. switching current = 0.5 A; max. peak (10 sec) current = 1 A

(5)

For output for low-voltage PWM control of a solid-state relay (W7754K, only) to be used, these terminals must be configured (via LNS plug-in) for "Heat" ->

"PWM".

(6)

In order for AO1 (terminal 12) to be used to control a 6-way ball valve from Belimo, OUT1 must be configured for "Not USED," OUT2 (term. 21 and 22) must be

configured (via LNS plug-in) for "Changeover Mode" type "Floating Mid," and the fan must not use the analog output (no fan or 1...3-speed fan).

(7)

Total current draw of terminals 19 through 24 and 27 through 28 must not exceed 450 mA.

function

network

ORKS

(2)

or to control a 6-way ball valve

(1)