This document provides installation, operation, and maintenance instructions for HBC(X), PHBC(X), RHBC(X), and CHBC(X) Horizontal Hydronic Fan Coil Units.

Function Description:

These units are horizontal hydronic fan coil units designed for indoor installation, typically above a dropped ceiling. They are designed to provide heating and cooling by circulating either hot or chilled water through a hydronic coil. The fan circulates air over the coil, transferring heat to or from the conditioned space. The units are listed for installation with zero clearance to combustible materials, including the fan coil cabinet, discharge plenum, and connecting ducts.

Important Technical Specifications:

Installation: Designed for horizontal installation above a dropped ceiling. Indoor use only. Zero clearance to combustible materials.
Drainage: Units must be installed level or angled toward the drain nipple to ensure proper drainage. RHBC(X) and CHBC(X) units require a minimum trap of 1-1/2 inches in the drain line. HBC(X) and PHBC(X) units may not require a trapped condensate line if negative pressure is absent, but it is recommended.
Electrical: All wiring must comply with local and national codes (e.g., National Electric Code, ANSI/NFPA No. 70). Units are provided with wiring diagrams and nameplate data for field wiring. Remote control boxes may be furnished and should be located near the unit for servicing. Field wiring between the control box and motor junction box must use flexible metal conduit or armored cable. Units include a Class 2 transformer for 24-volt control circuits. Copper conductors only.
Piping: Hydronic coil designed for use with hot or chilled water. Piping must be adequately sized for design water flow and installed according to codes. Valve packages will not support the weight of connecting pipes. Provisions for expansion and contraction of piping systems are necessary. Motorized valves must not have the power head below horizontal and require 3/4-inch clearance for removal.
Ductwork: All ductwork must comply with National Fire Protection Association Codes 90A and 90B. Ducts should be adequately insulated (minimum 1-inch in conditioned areas, 2-inches in unconditioned areas with a vapor barrier). Return air must be filtered. Supply and return duct systems must be sized for air requirements and static pressure capabilities.

Usage Features:

Safety: The manual emphasizes safety with general safety-alert symbols, lightning bolt symbols for electrical shock hazards, and WARNING/CAUTION labels. It warns against altering the product, improper installation, or using unauthorized parts, which voids warranties and can lead to hazardous conditions.
Installation Guidance: Detailed instructions are provided for mounting, electrical connections, and piping. It specifies that installation should only be performed by a licensed contractor.
Valve Assemblies: The units may use either two-way or three-way motorized valve assemblies. Procedures for attaching these to the coil and ensuring proper operation (e.g., checking hand valve movement, ensuring motorized valve power head is not below horizontal) are outlined.
Pre-Startup Checks: A comprehensive list of checks is provided before starting the unit, including verifying supply voltage, proper grounding, blower wheel tightness, secure installation, correct sloping for drainage, accessibility for servicing, proper condensate line setup, sealed cabinet openings, and correct filter installation.

Maintenance Features:

Fan Maintenance: The fan should be inspected and cleaned annually to prevent imbalance and vibration.
Motor Maintenance: Motor connections should be checked for security according to the wiring diagram. The blower motor should be cleaned annually. For units with ECM motors, power must be disconnected before servicing.
Filter Maintenance: The air filter should be cleaned or replaced every 30 days, or more frequently under severe conditions. Always replace with the same type. The unit must never run without an air filter.
Coil Cleaning: Dust and contaminants on heat transfer surfaces impair airflow and heat transfer. The coil must be kept clean using low-pressure compressed air or flushing/rinsing with water (detergent advisable for greasy surfaces).
Drain Piping Maintenance: The drain line should always be connected to an acceptable disposal point, sloped at least 1/8-inch per foot, and checked before and periodically during summer operation.
Preventative Maintenance: A formal schedule of regular maintenance is recommended to achieve maximum performance and service life.
Maintenance Program Log: A current copy of the Maintenance Program log is available online at www.firstco.com under "Product Information."

General Warnings and Cautions:

Installer/Service Personnel/Owner Responsibility: Altering the product, improper installation, or using unauthorized parts voids warranties and can lead to hazardous conditions. Company employees or contractors are not authorized to waive this warning.
Safety First: Always wear eye protection and work gloves. Disconnect all power before servicing. Be aware of multiple disconnect switches. Do not touch rotating components. Secure all panels before operation. Clear the surrounding area of tools and debris.
Codes and Regulations: All installations must conform to national, state, and local codes. Local authorities should be consulted.
Damage Prevention: Do not operate the unit during building construction due to excessive airborne dust. Do not bend or reposition coil header tubing for alignment. Hydronic systems should only be tested with water, not pressurized air.
Noise: While designed for quiet operation, some noise transfer to the conditioned space is expected and should be considered during planning.
Warranty: The manufacturer does not warrant equipment subjected to abuse (e.g., metal chips, dust, drywall tape, paint overspray).
Shipping Damage: Inspect shipments immediately upon receipt. Note any damage on the delivery receipt and file a claim with the carrier.

First Co HBC - Page 8

Table of Contents